Further, the particle size of the superfine talcum powder is 1-5 microns, and the black master is an unsupported black master with the carbon black concentration of 40%.

Further, the antioxidant is a mixture of an antioxidant 1076 (beta- [3, 5-di-tert-butyl-4-hydroxyphenyl ] n-octadecyl propionate) and an antioxidant 168 (tris [2, 4-di-tert-butylphenyl ] phosphite), and the ratio of the antioxidant 1076 to the antioxidant 168 is 1: 4.

the preparation method of the low-gloss PC material comprises the following steps: (a) weighing PC, PA6, the grafted elastomer, the superfine talcum powder, the black master and the antioxidant according to the weight parts of the formula, and respectively putting the weighed materials into a high-speed stirring pot to mix for 10 min; (b) putting the mixed material stirred in the step (a) into a double-screw extruder, setting the temperature of a material cylinder of the double-screw extruder to 255-; (c) drying the PC material particles obtained in the step (b) at 120 ℃ for 4 hours, then performing injection molding at 260-280 ℃ to obtain a standard test sample strip, and then testing the mechanical property and the glossiness.

Further, the temperature of the barrel in the step (b) is controlled as follows: the first interval is 255 +/-5 ℃, the second interval is 260 +/-5 ℃, the third interval is 265 +/-5 ℃, the fourth interval is 265 +/-5 ℃, the fifth interval is 265 +/-5 ℃, the sixth interval is 270 +/-5 ℃, the seventh interval is 270 +/-5 ℃, the eighth interval is 265 +/-5 ℃, the ninth interval is 265 +/-5 ℃ and the tenth interval is 260 +/-5 ℃.

The invention has the beneficial effects that:

(1) according to the low-gloss PC material provided by the invention, expensive organic or inorganic matting agents are not required to be added for matting modification, and only any two or three of PA6, a grafted elastomer and superfine talcum powder are required to be added for alloying modification of the PC material, so that a low-gloss (matte) effect is achieved, the low-gloss PC material has a good matte surface effect and excellent mechanical properties, has better toughness compared with the low-gloss PC material added with the matting agents BMAT, and different low-gloss PC materials can be selected according to different glossiness and mechanical property requirements in practical application; the invention also adopts the mixed antioxidant of the antioxidant 1076 and the antioxidant 168, so the antioxidant effect is better; the preparation method of the low-gloss PC material is simple, the used equipment is a common water brace double-screw extruder with wide applicability, and the large-scale production is easy to realize.

Detailed Description

The invention will be further illustrated by the following specific examples, which are given for illustrative purposes only and are not intended to be limiting;

examples 1 to 5 and comparative examples 1 to 7:

table 1 shows the composition and ratio of examples 1-5 and comparative examples 1-7, wherein comparative examples 1 and 2 are obtained by adding PA6 alone and without adding a graft elastomer and an ultrafine talc; comparative examples 3 and 4 were made with the addition of the grafted elastomer alone, without the addition of PA6 and extra fine talc; comparative example 5 was made with the addition of extra fine talc and without the addition of PA6 and grafted elastomer; comparative example 6 was with BMAT added, no PA6, graft elastomer, and extra fine talc; comparative example 7 was made without the addition of PA6, graft elastomer, extra fine talc and BMAT.

Wherein the PC material is bisphenol A type PC.

Wherein, the relative viscosity of the PA6 material is 2-4.

Wherein the grafted elastomer material is maleic anhydride grafted ethylene-octene copolymer.

Wherein the particle size of the superfine talcum powder is 1-5 microns; the black master is an unsupported black master with the carbon black concentration of 40%.

Wherein the antioxidant is a mixture of an antioxidant 1076 (beta- [3, 5-di-tert-butyl-4-hydroxyphenyl ] n-octadecyl propionate) and an antioxidant 168 (tris [ 2.4-di-tert-butylphenyl ] phosphite), and the ratio of the antioxidant 1076 to the antioxidant 168 is 1: 4.

TABLE 1 Components and proportions of examples 1-5 and comparative examples 1-7

The raw materials were weighed according to the ratios in table 1 and mixed in a high speed stirred pot for 10 min. Putting the stirred mixture into a double-screw extruder, and controlling the temperature of a charging barrel of the double-screw extruder to be: the first interval is 255 +/-5 ℃, the second interval is 260 +/-5 ℃, the third interval is 265 +/-5 ℃, the fourth interval is 265 +/-5 ℃, the fifth interval is 265 +/-5 ℃, the sixth interval is 270 +/-5 ℃, the seventh interval is 270 +/-5 ℃, the eighth interval is 265 +/-5 ℃, the ninth interval is 265 +/-5 ℃, the tenth interval is 260 +/-5 ℃, and the PC material particles with low glossiness are obtained by extruding, water drawing, cutting into strips and cutting into particles.

TABLE 2 test standards and test conditions

Test items	Test standard	Test conditions
			Density of	ISO 1183	23℃
Melt index	ISO 1133	300℃，1.2Kg
			Tensile strength	ISO 527	V is 50mm/min, 1A sample strip
Elongation at break	ISO 527	V is 50mm/min, 1A sample strip
			Bending strength	ISO 178	V＝2mm/min，80104mm
Notched impact strength	ISO 179	80 x 8 x 4mm, notch A
			Vicat heat resistance	ISO 306	50℃/h，50N
Degree of gloss	GB 8807	60°

The PC material particles obtained in examples 1-5 and comparative examples 1-7 were dried at 120 ℃ for 4 hours and then injection molded into standard bars at 260 ℃ and 280 ℃. The mechanical properties were tested according to the international organization for standardization (ISO) standard, the gloss was tested according to the national standard of the people's republic of china GB 8807, the test standards and test conditions are shown in table 2. The test results are shown in table 3.

TABLE 3 Performance test results

And (3) testing results: the results of the performance tests of inventive examples 1-5 and comparative examples 1-7 are shown in Table 3.

From the performance test results of table 3, it can be seen that, in terms of matte effect performance, the matte performance of examples 1 to 5 is more excellent than that of comparative example 6, from example 4 > example 5 > example 1 > example 2 > example 3 > comparative example 6 > comparative example 7 > comparative example 2 > comparative example 1 > comparative example 4 > comparative example 3 > comparative example 5.

The performance test results of table 3 show that: the separate addition of PA6, the grafted elastomer, and the ultrafine talc to the PC materials of comparative examples 1-5, consistent with the results of the patents in the background art, all improved the gloss of the PC materials. Unexpectedly, the arbitrary addition of two materials selected from PA6, the grafted elastomer and the ultrafine talc to the PC materials of examples 1 to 3 not only did not produce the superposition phenomenon of improving the glossiness of the PC materials, but also reduced the glossiness of the PC materials to form the matte effect, and the matte effect formed by the addition of the matting agent BMAT in comparison with the matte effect of the PC material added with the matting agent in the comparison example 6. In the PC materials of the embodiments 4 and 5, the PA6, the grafted elastomer and the superfine talcum powder are added simultaneously, so that the glossiness of the obtained PC material is further reduced compared with that of the PC materials of the embodiments 1 to 3, and the matte effect is more prominent.

Also, from the performance test results of table 3, it can be derived: in terms of processability, the PC materials of example 2 > example 1 > comparative example 6 > comparative example 7 > comparative example 3 > comparative example 4 > comparative example 5 had better processability than the other examples and comparative examples, and the melt indexes thereof were 19g/10min and 23g/10min, respectively.

In addition, from the performance test results of table 3, it can also be derived: notched impact strength, example 3 > comparative example 7 > example 5 > example 1 and example 4 > comparative example 6 > example 2; thus, the PC materials of example 1 and examples 3-5 have significantly better toughness than the PC material of comparative example 6 with addition of the matting agent BMAT, especially the PC material of example 3, with notched impact strength nearly 6 times that of comparative example 6; wherein, the example 2 has poor toughness because the grafted elastomer is not added, and the compatibility of the two materials is poor.

Therefore, the matte effect and the mechanical property can be combined, and the PC materials of different embodiments can be selected according to different requirements on glossiness and mechanical property in practical application.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.

Claims

1. A low gloss PC material characterized by: the low-gloss PC material is prepared from the following components in parts by weight:

PC 73-93

PA6 0-20

0 to 10 parts of grafted elastomer

0-2 parts of superfine talcum powder

Black masterbatch 1

0.2 to 0.5 percent of antioxidant.

2. A low gloss PC material according to claim 1 wherein: the low-gloss PC material is prepared from the following components in parts by weight:

PC 73-93

PA6 10-20

grafted elastomer 5-10

1-2 parts of superfine talcum powder

Black masterbatch 1

0.2 to 0.5 percent of antioxidant.

3. A low gloss PC material according to claim 2 wherein: the low-gloss PC material is prepared from the following components in parts by weight:

PC 73

PA6 20

grafted elastomer 5

Superfine talcum powder 1

Black masterbatch 1

0.2 of antioxidant.

4. A low gloss PC material according to claim 1 wherein: the PC is bisphenol A type PC material.

5. A low gloss PC material according to claim 1 wherein: the PA6 material has a relative viscosity of 2-4.

6. A low gloss PC material according to claim 1 wherein: the grafted elastomer material is a maleic anhydride grafted ethylene-octene copolymer.

7. A low gloss PC material according to claim 1 wherein: the grain size of the superfine talcum powder is 1-5 microns; the black master batch is an unsupported black master batch with the carbon black concentration of 40%.

8. A low gloss PC material according to claim 1 wherein: the antioxidant is a mixture of an antioxidant 1076 and an antioxidant 168, and the mixing ratio of the antioxidant 1076 to the antioxidant 168 is 1: 4.

9. the method for preparing a low gloss PC material according to any one of claims 1 to 8, wherein: the method comprises the following steps: (a) weighing PC, PA6, the grafted elastomer, the superfine talcum powder, the black master and the antioxidant according to the weight parts of the formula, and respectively putting the weighed materials into a high-speed stirring pot to mix for 10 min; (b) putting the mixed material stirred in the step (a) into a double-screw extruder, setting the temperature of a material cylinder of the double-screw extruder to 255-; (c) drying the PC material particles obtained in the step (b) at 120 ℃ for 4 hours, then performing injection molding at 260-280 ℃ to obtain a standard test sample strip, and then testing the mechanical property and the glossiness.

10. The method of claim 9 for preparing a low gloss PC material, wherein: the temperature of the charging barrel is controlled as follows: the first interval is 255 +/-5 ℃, the second interval is 260 +/-5 ℃, the third interval is 265 +/-5 ℃, the fourth interval is 265 +/-5 ℃, the fifth interval is 265 +/-5 ℃, the sixth interval is 270 +/-5 ℃, the seventh interval is 270 +/-5 ℃, the eighth interval is 265 +/-5 ℃, the ninth interval is 265 +/-5 ℃ and the tenth interval is 260 +/-5 ℃.