技术领域technical field
本发明属于有机高分子化合物领域，具体涉及一种含有聚乳酸的膜材料的制备方法。The invention belongs to the field of organic polymer compounds, and in particular relates to a preparation method of a membrane material containing polylactic acid.
背景技术Background technique
聚乳酸可以通过生物质资源，如植物淀粉来制备，因此产业规模大；聚乳酸可生物降解，在环境中最终被分解为二氧化碳和水。而且，聚乳酸具有良好的成型加工性能。聚乳酸作为环境友好的可生物降解塑料取代传统石油基塑料，具有强大的竞争力和广泛的应用前景；然而，聚乳酸存在着质硬、韧性差、耐热性差等缺点，极大的限制了其在航空、汽车等工程领域的应用，因此对聚乳酸进行增强增韧改性有重要意义。本领域研究者考虑用其他材料与聚乳酸制成复合膜。专利CN 104231582 A用蓖麻油共聚物和聚氨酯共聚物与聚乳酸制成复合材料，提高了材料的拉伸强度。但制备方法复杂。Polylactic acid can be prepared from biomass resources, such as plant starch, so it has a large industrial scale; polylactic acid is biodegradable and will eventually be decomposed into carbon dioxide and water in the environment. Moreover, polylactic acid has good molding processability. As an environmentally friendly biodegradable plastic to replace traditional petroleum-based plastics, polylactic acid has strong competitiveness and broad application prospects; however, polylactic acid has disadvantages such as hard quality, poor toughness, and poor heat resistance, which greatly limit Its application in aviation, automobile and other engineering fields, so it is of great significance to strengthen and toughen polylactic acid. Researchers in the field consider using other materials to make composite membranes with polylactic acid. Patent CN 104231582 A uses castor oil copolymer, polyurethane copolymer and polylactic acid to make a composite material, which improves the tensile strength of the material. But the preparation method is complicated.
木质素是植物界中第二丰富的天然高分子,具有独特的苯丙基结构及种类丰富的活性官能团，兼具可再生、可降解、无毒等优点，而且工业木质素来源于造纸黑液，其成本低廉，是优良的可持续发展的绿色化工原料；木质素作为聚乳酸的增强体系能够和聚乳酸有良好的界面作用，提高聚乳酸复合材料的性能。取自于植物资源的纳米纤维素具有大的比表面积，高的模量，表面有大量的羟基，形成分子内和分子间的氢键，具有很高的机械强度；可以作为增强相来改善基体的特性，同时，纳米纤维素与聚合物基体之间较差的界面作用限制了其作为增强材料的应用范围。Lignin is the second most abundant natural polymer in the plant kingdom. It has a unique phenylpropyl structure and a wide variety of active functional groups. It has the advantages of being renewable, degradable, and non-toxic. Industrial lignin is derived from papermaking black liquor , its cost is low, and it is an excellent sustainable development of green chemical raw materials; lignin, as a reinforcement system of polylactic acid, can have a good interface with polylactic acid and improve the performance of polylactic acid composite materials. Nanocellulose obtained from plant resources has a large specific surface area, high modulus, and a large number of hydroxyl groups on the surface, forming intramolecular and intermolecular hydrogen bonds, and has high mechanical strength; it can be used as a reinforcing phase to improve the matrix At the same time, the poor interfacial interaction between nanocellulose and the polymer matrix limits its application range as a reinforcing material.
采用酸水解-高压均质的方法制备木素纳米纤维素以及溶液浇铸-溶剂挥发法制备木素纳米纤维素-聚乳酸复合膜材料，通过上述方法可以充分发挥纳米纤维素的增强，木质素的增容效果，获得机械性能优良，耐热性好的木素纳米纤维素-聚乳酸复合膜材料。Using the method of acid hydrolysis-high pressure homogenization to prepare lignin nanocellulose and solution casting-solvent volatilization method to prepare lignin nanocellulose-polylactic acid composite membrane materials, through the above methods, the reinforcement of nanocellulose and lignin can be fully utilized. The compatibilization effect is obtained, and the lignin nanocellulose-polylactic acid composite membrane material with excellent mechanical properties and good heat resistance is obtained.
发明内容Contents of the invention
针对本领域存在的不足之处，本发明的目的是提出一种木素纳米纤维素增强聚乳酸复合膜的制备方法。In view of the deficiencies in the art, the purpose of the present invention is to propose a preparation method of lignocellulose nanocellulose reinforced polylactic acid composite membrane.
本发明的另一目的是提出所述制备方法制得的聚乳酸复合膜。Another object of the present invention is to propose the polylactic acid composite membrane prepared by the preparation method.
实现本发明上述目的的技术方案为：The technical scheme that realizes the above-mentioned purpose of the present invention is:
一种木素纳米纤维素增强聚乳酸复合膜的制备方法，包括步骤：A preparation method of lignin nanocellulose reinforced polylactic acid composite film, comprising steps:
1)酸水解-高压均质法制备木素纳米纤维素：原料为木浆板，用硫酸水解，然后高压均质得到木素纳米纤维素；1) Preparation of lignin nanocellulose by acid hydrolysis-high pressure homogenization: the raw material is wood pulp board, hydrolyzed with sulfuric acid, and then homogenized under high pressure to obtain lignin nanocellulose;
2)用溶液浇铸-溶剂挥发法制备木素纳米纤维素增强聚乳酸复合膜：取重量份配比的聚乳酸8-10、木素纳米纤维素0.08-0.5，与有机溶剂混合获得铸膜原液，对铸膜原液进行真空脱泡处理，将铸膜原液制成薄膜。所述有机溶剂为N,N二甲基乙酰胺。2) Preparation of lignonanocellulose-reinforced polylactic acid composite film by solution casting-solvent volatilization method: take 8-10 parts by weight of polylactic acid and 0.08-0.5 parts by weight of polylactic acid and 0.08-0.5 part of lignonanocellulose, and mix them with an organic solvent to obtain a casting film stock solution , Carry out vacuum defoaming treatment on the cast film stock solution, and make the cast film stock solution into a thin film. The organic solvent is N,N dimethylacetamide.
其中，所述步骤1)中，牛皮纸桨板置于20-25wt％硫酸溶液中，80-90℃条件下水解4-5小时，然后经过高速离心沉淀，用去离子水清洗直至洗出液为中性，之后将固体物转移至N-N二甲基乙酰胺中，在100MPa压力下均质分散5-10次。Wherein, in the step 1), the kraft paper paddle is placed in 20-25wt% sulfuric acid solution, hydrolyzed at 80-90°C for 4-5 hours, then subjected to high-speed centrifugal precipitation, and washed with deionized water until the eluate is Neutral, then transfer the solid to N-N dimethylacetamide, and disperse homogeneously for 5-10 times under 100MPa pressure.
在均质分散之前可以进行乳化处理。Emulsification treatment may be performed before homogeneous dispersion.
优选地，木浆板用酸水解之前先用粉碎机粉碎。木浆板置于20-25wt％硫酸溶液中的固液比为1:20g/mL。Preferably, the wood pulp board is comminuted with a pulverizer prior to acid hydrolysis. The solid-to-liquid ratio of the wood pulp board placed in 20-25wt% sulfuric acid solution is 1:20g/mL.
其中，在步骤2)中，将聚乳酸加入到均质分散后的木素纳米纤维素的N,N二甲基乙酰胺溶液中，超声搅拌使其溶解，获得铸膜原液。Wherein, in step 2), polylactic acid is added to the homogeneously dispersed N,N dimethylacetamide solution of lignocellulose nanocellulose, and ultrasonically stirred to dissolve it, so as to obtain a casting film stock solution.
优选地，所述铸膜原液中，聚乳酸的重量与N,N二甲基乙酰胺的体积之比为8-10g：40-60mL，木素纳米纤维素质量与聚乳酸的重量之比为0.08-0.5：8-10。Preferably, in the casting film stock solution, the ratio of the weight of polylactic acid to the volume of N,N dimethylacetamide is 8-10g: 40-60mL, and the ratio of the weight of lignocellulose nanocellulose to the weight of polylactic acid is 0.08-0.5:8-10.
所述的重量与体积之比，也可为本领域技术人员熟知的其他单位，比如千克/升。The weight-to-volume ratio may also be in other units known to those skilled in the art, such as kg/liter.
进一步地，超声搅拌的温度为70-90℃，搅拌时间为2-4h。Further, the temperature of ultrasonic stirring is 70-90°C, and the stirring time is 2-4h.
其中，所述步骤2)中，在超声作用下抽真空，对所述铸膜原液进行真空脱泡处理，脱泡时的真空度为-0.05至-0.09MPa。Wherein, in the step 2), the vacuum is vacuumed under the action of ultrasound, and the vacuum degassing treatment is performed on the casting film stock solution, and the vacuum degree during degassing is -0.05 to -0.09MPa.
优选地，所述真空脱泡处理的时间为0.5h。Preferably, the time of the vacuum defoaming treatment is 0.5h.
其中，所述步骤2)中，制成薄膜的步骤为：将铸膜原液置于玻璃板上刮制成膜；将玻璃板置于平板加热器上，在80～90℃下进行溶剂挥发，静置20～30min，揭膜得到复合膜材料。膜的厚度可为100-200μm。Wherein, in the step 2), the step of making a thin film is as follows: placing the cast film stock solution on a glass plate and scraping to form a film; placing the glass plate on a flat heater, and volatilizing the solvent at 80-90°C, Stand still for 20-30 minutes, and peel off the film to obtain the composite film material. The thickness of the film may be 100-200 μm.
本发明所述的制备方法制得的聚乳酸复合膜。The polylactic acid composite film prepared by the preparation method of the present invention.
本发明的有益效果在于：The beneficial effects of the present invention are:
本发明首次将含有木素的纳米纤维素与聚乳酸复合，用纳米材料对聚乳酸进行增强，木质素的引入解决了纳米纤维素与聚乳酸基体相容性不好导致的力学性能低的问题，改善相界面的粘附作用。In the present invention, nanocellulose containing lignin is combined with polylactic acid for the first time, and polylactic acid is reinforced with nanomaterials. The introduction of lignin solves the problem of low mechanical properties caused by poor compatibility between nanocellulose and polylactic acid matrix , to improve the adhesion of the phase interface.
通过实验确定控制聚乳酸复合膜力学性能的关键参数是木素纳米纤维素的添加量，木素纤维素刮膜厚度以及木素纤维素的水解温度、时间、均质次数对实验结果影响次之。Through experiments, it is determined that the key parameter to control the mechanical properties of polylactic acid composite membranes is the addition amount of lignocellulose nanocellulose, and the thickness of lignocellulose scraped film, as well as the hydrolysis temperature, time, and homogenization times of lignocellulose have less influence on the experimental results. .
具体实施方式detailed description
以下实施例用于说明本发明，但不用来限制本发明的范围。The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
本发明实施例中所采用的：木浆板购自山东森博木浆厂；硫酸、N,N-二甲基乙酰胺购自北京化工厂；聚乳酸(PLA)购自上海易生有限公司。Used in the embodiment of the present invention: wood pulp board was purchased from Shandong Senbo wood pulp factory; sulfuric acid and N,N-dimethylacetamide were purchased from Beijing Chemical Plant; polylactic acid (PLA) was purchased from Shanghai Yisheng Co., Ltd. .
实施例中使用的真空脱气装置采用实验室简易仪器构成，主要包括真空泵，抽滤瓶与超声振荡器，将铸膜原液倒入抽滤瓶中，将抽滤瓶置于超声振荡器中，抽滤瓶连接真空泵从而实现铸膜原液的真空脱气。The vacuum degassing device used in the embodiment is composed of simple laboratory instruments, mainly including a vacuum pump, a suction filter bottle and an ultrasonic oscillator. The film casting stock solution is poured into the suction filter bottle, and the suction filter bottle is placed in the ultrasonic oscillator. The suction filter bottle is connected to a vacuum pump to realize vacuum degassing of the casting film stock solution.
实施例中，如无特殊说明，所使用的方法均为本领域常规的方法。In the examples, unless otherwise specified, the methods used are conventional methods in the art.
实施例1Example 1
1、按照如下重量配比进行备料：1. Prepare materials according to the following weight ratio:
聚乳酸10g，木素纳米纤维素0.1g，N，N-二甲基乙酰胺50mL。木素纳米纤维素制备方法为：木浆板(先用粉碎机粉碎)置于20wt％硫酸溶液中，固液比1:20g/mL，80℃条件下水解5小时，然后经过高速离心沉淀，用去离子水清洗沉淀直至洗出液为中性，得到的固体物即为木素纤维素，然后将固体物转移至N-N二甲基乙酰胺中。Polylactic acid 10g, lignocellulose nanocellulose 0.1g, N,N-dimethylacetamide 50mL. The preparation method of lignocellulose nanocellulose is: the wood pulp board (first pulverized with a pulverizer) is placed in 20wt% sulfuric acid solution, the solid-to-liquid ratio is 1:20g/mL, hydrolyzed at 80°C for 5 hours, and then subjected to high-speed centrifugal precipitation. Wash the precipitate with deionized water until the eluate is neutral, and the obtained solid is lignocellulose, and then transfer the solid to N-N dimethylacetamide.
2、制备铸膜原液2. Preparation of casting film stock solution
在100MPa的高压下均质，共均质8次，将木素纳米纤维素均匀分散于N,N-二甲基乙酰胺中，然后加入聚乳酸，在80℃的条件下超声搅拌3h(超声搅拌功率200W)，获得木素纳米纤维素-聚乳酸铸膜原液。Homogenize under a high pressure of 100MPa, and homogenize 8 times in total, evenly disperse the lignocellulose nanocellulose in N,N-dimethylacetamide, then add polylactic acid, and stir ultrasonically for 3 hours at 80°C (ultrasonic The stirring power is 200W), and the lignin nanocellulose-polylactic acid cast film stock solution is obtained.
3、铸膜液的脱气3. Degassing of casting solution
将制备的铸膜原液置于真空脱气装置中，开启真空泵对铸膜原液在70℃进行超声减压抽真空脱气(超声功率200W)，相对真空度为-0.09MPa，脱气时间为0.5h。Place the prepared film-casting stock solution in a vacuum degassing device, turn on the vacuum pump to perform ultrasonic decompression and vacuum degassing (ultrasonic power 200W) on the film-casting stock solution at 70°C, the relative vacuum degree is -0.09MPa, and the degassing time is 0.5 h.
4、刮膜成型4. Squeegee film forming
1)取脱泡后的铸膜液流延于洁净的玻璃板上，调节自动刮膜机刮膜厚度为150μm；1) Take the defoamed casting solution and cast it on a clean glass plate, and adjust the thickness of the film scraped by the automatic film scraping machine to 150 μm;
2)将玻璃板置于平板加热器上，平板加热器的温度设置为80℃；2) Place the glass plate on the flat heater, and set the temperature of the flat heater to 80°C;
3)20min后取下玻璃板，冷却至室温，揭膜得到复合膜产品。3) After 20 minutes, remove the glass plate, cool to room temperature, and remove the film to obtain a composite film product.
样品的拉伸测试是按照ASTM测试标准，薄膜试样100mm×15mm×0.15mm(长×宽×厚度)，拉伸速率为1mm/min,测试次数5次，结果取平均值，得到复合膜的性能指标，膜材料的抗张强度和断裂伸长率分别为60MPa和4.8％，热降解温度为330℃。The tensile test of the sample is according to the ASTM test standard, the film sample is 100mm × 15mm × 0.15mm (length × width × thickness), the tensile rate is 1mm/min, the number of tests is 5 times, and the results are averaged to obtain the composite film. Performance indicators, the tensile strength and elongation at break of the membrane material are 60MPa and 4.8%, respectively, and the thermal degradation temperature is 330°C.
实施例2Example 2
1、按照如下重量配比进行备料：1. Prepare materials according to the following weight ratio:
聚乳酸：10g，木素纳米纤维素：0.3g，N，N-二甲基乙酰胺50mL。木素纳米纤维素制备方法为：木浆板(使用前先用粉碎机粉碎)置于20wt％硫酸溶液中，固液比1:20g/mL，90℃条件下水解4小时，然后经过高速离心沉淀，用去离子水清洗沉淀直至洗出液为中性，得到的固体物即为木素纳米纤维素，然后将固体物转移至N-N二甲基乙酰胺中。Polylactic acid: 10g, lignonanocellulose: 0.3g, N,N-dimethylacetamide 50mL. The preparation method of lignocellulose nanocellulose is as follows: wood pulp board (crushed with a pulverizer before use) is placed in 20wt% sulfuric acid solution, the solid-to-liquid ratio is 1:20g/mL, hydrolyzed at 90°C for 4 hours, and then subjected to high-speed centrifugation Precipitate, wash the precipitate with deionized water until the eluate is neutral, and the obtained solid is lignin nanocellulose, and then transfer the solid to N-N dimethylacetamide.
2、制备铸膜原液2. Preparation of casting film stock solution
在100MPa的高压下均质，共均质10次，将木素纳米纤维素均匀分散于N,N-二甲基乙酰胺中，然后加入聚乳酸，在80℃的条件下超声搅拌3h(超声搅拌功率200W)，获得木素纳米纤维素-聚乳酸铸膜原液。Homogenize under a high pressure of 100MPa, and homogenize for 10 times in total, evenly disperse the lignocellulose nanocellulose in N,N-dimethylacetamide, then add polylactic acid, and stir ultrasonically for 3 hours at 80°C (ultrasonic The stirring power is 200W), and the lignin nanocellulose-polylactic acid cast film stock solution is obtained.
3、铸膜液的脱气3. Degassing of casting solution
将制备的铸膜原液置于真空脱气装置中，开启真空泵对真空脱气装置中的铸膜原液在70℃进行超声减压抽真空脱气(超声功率200W)，相对真空度为-0.09MPa，脱气时间为0.5h。Place the prepared film-casting stock solution in a vacuum degasser, turn on the vacuum pump to decompress and vacuum-degas the film-casting stock solution in the vacuum degasser at 70°C (ultrasonic power 200W), and the relative vacuum degree is -0.09MPa , The degassing time is 0.5h.
4、刮膜成型4. Squeegee film forming
1)取脱泡后的铸膜液流延于洁净的玻璃板上，调节自动刮膜机刮膜厚度为200μm；1) Take the defoamed casting solution and cast it on a clean glass plate, and adjust the thickness of the film scraped by the automatic film scraping machine to 200 μm;
2)将玻璃板置于平板加热器上，平板加热器的温度设置为80℃；2) Place the glass plate on the flat heater, and set the temperature of the flat heater to 80°C;
3)20min后取下玻璃板，冷却至室温，揭膜得到本发明产品。3) After 20 minutes, the glass plate is removed, cooled to room temperature, and the film is removed to obtain the product of the present invention.
样品的拉伸测试是按照ASTM测试标准，薄膜试样100mm×15mm×0.2mm(长×宽×厚度)，拉伸速率为1mm/min,测试次数5次，结果取平均值，得到复合膜的性能指标，膜材料的抗张强度和断裂伸长率分别为65MPa和5.5％，热降解温度达到340℃。The tensile test of the sample is according to the ASTM test standard, the film sample is 100mm×15mm×0.2mm (length×width×thickness), the tensile rate is 1mm/min, the number of tests is 5 times, and the results are averaged to obtain the composite film. Performance indicators, the tensile strength and elongation at break of the film material are 65MPa and 5.5%, respectively, and the thermal degradation temperature reaches 340°C.
实施例3Example 3
1、按照如下重量配比进行备料：1. Prepare materials according to the following weight ratio:
聚乳酸10g，木素纳米纤维素0.5g，N，N-二甲基乙酰胺50mL。木素纳米纤维素制备方法为：木浆板(使用前先用粉碎机粉碎)置于20wt％硫酸溶液中，固液比1:20g/mL，80℃条件下水解5小时，然后经过高速离心沉淀，用去离子水清洗沉淀直至洗出液为中性，得到的固体物即为木素纳米纤维素，然后将固体物转移至N-N二甲基乙酰胺中。Polylactic acid 10g, lignocellulose nanocellulose 0.5g, N,N-dimethylacetamide 50mL. The preparation method of lignonanocellulose is: wood pulp board (crushed with pulverizer before use) is placed in 20wt% sulfuric acid solution, solid-to-liquid ratio 1:20g/mL, hydrolyzed at 80 ℃ for 5 hours, then through high-speed centrifugation Precipitate, wash the precipitate with deionized water until the eluate is neutral, and the obtained solid is lignin nanocellulose, and then transfer the solid to N-N dimethylacetamide.
2、制备铸膜原液2. Preparation of casting film stock solution
在100MPa的高压下均质，共均质5次，将木素纳米纤维素均匀分散于N,N-二甲基乙酰胺中，然后加入聚乳酸，在80℃的条件下超声搅拌3h(超声搅拌功率200W)，获得木素纳米纤维素-聚乳酸铸膜原液。Homogenize under a high pressure of 100MPa, homogenize 5 times in total, disperse lignocellulose nanocellulose in N,N-dimethylacetamide, then add polylactic acid, and stir ultrasonically at 80°C for 3h (ultrasonic The stirring power is 200W), and the lignin nanocellulose-polylactic acid cast film stock solution is obtained.
3、铸膜液的脱气3. Degassing of casting solution
将制备的铸膜原液置于真空脱气装置中，开启真空泵对铸膜原液在70℃进行超声减压抽真空脱气(超声功率200W)，相对真空度为-0.09MPa，脱气时间为0.5h。Place the prepared film-casting stock solution in a vacuum degassing device, turn on the vacuum pump to perform ultrasonic decompression and vacuum degassing (ultrasonic power 200W) on the film-casting stock solution at 70°C, the relative vacuum degree is -0.09MPa, and the degassing time is 0.5 h.
4、刮膜成型4. Squeegee film forming
1)取脱泡后的铸膜液流延于洁净的玻璃板上，调节自动刮膜机刮膜厚度为100μm；1) Take the defoamed casting solution and cast it on a clean glass plate, and adjust the thickness of the film scraped by the automatic film scraping machine to 100 μm;
2)将玻璃板置于平板加热器上，平板加热器的温度设置为80℃；2) Place the glass plate on the flat heater, and set the temperature of the flat heater to 80°C;
3)20min后取下玻璃板，冷却至室温，揭膜得到复合膜产品。3) After 20 minutes, remove the glass plate, cool to room temperature, and remove the film to obtain a composite film product.
样品的拉伸测试是按照ASTM测试标准，薄膜试样100mm×15mm×0.1mm(长×宽×厚度)，拉伸速率为1mm/min,测试次数5次，结果取平均值，得到复合膜的性能指标，膜材料的抗张强度和断裂伸长率分别为45MPa和1.9％，热降解温度为310℃。The tensile test of the sample is according to the ASTM test standard, the film sample is 100mm × 15mm × 0.1mm (length × width × thickness), the tensile rate is 1mm/min, the number of tests is 5 times, and the results are averaged to obtain the composite film. Performance indicators, the tensile strength and elongation at break of the membrane material are 45MPa and 1.9%, respectively, and the thermal degradation temperature is 310°C.
对比例comparative example
1、按照如下重量配比进行备料：1. Prepare materials according to the following weight ratio:
聚乳酸10g，N，N-二甲基乙酰胺50mL。Polylactic acid 10g, N,N-dimethylacetamide 50mL.
2、制备铸膜原液2. Preparation of casting film stock solution
将聚乳酸加入N,N-二甲基乙酰胺中，在80℃的条件下超声搅拌3h(超声搅拌功率200W)，获得纯聚乳酸铸膜原液。Add polylactic acid into N,N-dimethylacetamide, and ultrasonically stir for 3 hours at 80°C (ultrasonic stirring power: 200W) to obtain pure polylactic acid cast film stock solution.
3、铸膜液的脱气3. Degassing of casting solution
将制备的铸膜原液置于真空脱气装置中，开启真空泵对铸膜原液在70℃进行超声减压抽真空脱气(超声功率200W)，相对真空度为-0.09MPa，脱气时间为0.5h。Place the prepared film-casting stock solution in a vacuum degassing device, turn on the vacuum pump to perform ultrasonic decompression and vacuum degassing (ultrasonic power 200W) on the film-casting stock solution at 70°C, the relative vacuum degree is -0.09MPa, and the degassing time is 0.5 h.
4、刮膜成型4. Squeegee film forming
1)取脱泡后的铸膜液流延于洁净的玻璃板上，调节自动刮膜机刮膜厚度为100μm；1) Take the defoamed casting solution and cast it on a clean glass plate, and adjust the thickness of the film scraped by the automatic film scraping machine to 100 μm;
2)将玻璃板置于平板加热器上，平板加热器的温度设置为80℃；2) Place the glass plate on the flat heater, and set the temperature of the flat heater to 80°C;
3)20min后取下玻璃板，冷却至室温，揭膜得到纯聚乳酸薄膜产品。3) After 20 minutes, remove the glass plate, cool to room temperature, and remove the film to obtain a pure polylactic acid film product.
样品的拉伸测试是按照ASTM测试标准，薄膜试样100mm×15mm×0.1mm(长×宽×厚度)，拉伸速率为1mm/min,测试次数5次，结果取平均值，得到纯聚乳酸膜的性能指标，膜材料的抗张强度和断裂伸长率分别为43MPa和2.6％，热降解温度为309℃。The tensile test of the sample is in accordance with the ASTM test standard, the film sample is 100mm×15mm×0.1mm (length×width×thickness), the tensile rate is 1mm/min, the number of tests is 5 times, and the results are averaged to obtain pure polylactic acid The performance index of the membrane, the tensile strength and elongation at break of the membrane material are 43MPa and 2.6%, respectively, and the thermal degradation temperature is 309°C.
虽然，上文中已经用一般性说明及具体实施方案对本发明作了详尽的描述，但在本发明基础上，可以对之作一些修改或改进，这对本领域技术人员而言是显而易见的。因此，在不偏离本发明精神的基础上所做的这些修改或改进，均属于本发明要求保护的范围。Although the present invention has been described in detail with general descriptions and specific embodiments above, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, the modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
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| CN201510070556.2ACN104693464B (en) | 2015-02-10 | 2015-02-10 | A kind of preparation method of lignin nano-cellulose enhancing polymeric lactic acid compound film |
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