Disclosure of Invention
In order to overcome the defects in the background art, the invention provides the viscoelastic body anti-corrosion adhesive tape and the preparation method thereof, and the prepared viscoelastic body anti-corrosion adhesive tape achieves excellent adhesive property and mechanical property and has good chemical resistance by adjusting the proportion of components and the interlayer thickness.
The invention provides a viscoelastic body anti-corrosion adhesive tape, which comprises, by weight, 60-80 parts of high-density polyethylene, 20-40 parts of low-density polyethylene and 1-5 parts of conductive carbon black, and comprises, by weight, 40-60 parts of polyisobutylene, 10-30 parts of halogenated butyl rubber, 10-25 parts of a filler, 3-8 parts of acrylate rubber, 3-8 parts of a tackifier and 2-5 parts of an antioxidant.
The thickness of the polyolefin layer is 0.4-0.6mm.
Preferably, the polyolefin layer has a thickness of 0.45mm.
The thickness ratio of the polyolefin layer to the viscoelastic layer is 1 (2.5-4).
Preferably, the polyolefin layer to viscoelastic layer thickness ratio is 1:3.
The high density polyethylene has a melt flow index (190 ℃ C., 2.16 Kg) of 0.5-1.2g/10min.
Preferably, the high density polyethylene has a melt flow index of 1.1g/10min, available from Zhongxie under the designation 3300F.
The melt flow index of the low density polyethylene is 0.1-0.5g/10min.
Preferably, the low density polyethylene has a melt flow index (190 ℃ C., 2.16 Kg) of 0.33g/10min, available from Yanshan petrochemical, brand LD165.
The polyethylene anticorrosion adhesive tape base material has the advantages of acid resistance, alkali resistance, oil resistance, corrosion resistance and the like, but the polyethylene base material is extremely easy to generate static electricity, static electricity accumulation can possibly cause static spark discharge, the inventor researches that the high-density polyethylene and low-density polyethylene have the weight ratio of conductive carbon black of 75:25:2, so that the antistatic property of a polyolefin layer can be improved, the tensile property of the adhesive tape can also be improved, the conductive carbon black is presumed to be contacted with each other in a polymer matrix to form a certain amount of aggregates with irregular fiber structure, larger void volume exists, the contact point of particles in a composite system is increased, the distance between polymer chain segments is reduced, the acting force between the chain segments is increased, and further research discovers that the larger the specific surface area of the conductive carbon black is 300-700m2/g, the processing property of the polyolefin layer can be improved, the larger the specific surface area is, the better the dispersibility and the poorer the flowability of the conductive carbon black are unfavorable for molding processing, the smaller the specific surface area is, the residual stress between polyolefin chain segments is overlarge, and the mechanical property is easy to be reduced.
The weight ratio of the high-density polyethylene to the low-density polyethylene to the conductive carbon black is 1 (0.3-0.7) to 0.01-0.03.
Preferably, the weight ratio of the high-density polyethylene to the low-density polyethylene to the conductive carbon black is 75:25:2.
The specific surface area of the conductive carbon black is 300-700m2/g.
Preferably, the specific surface area of the conductive carbon black is 400M2/g, and the conductive carbon black is purchased from Hebei ink Yu chemical industry Co., ltd., model number is M80.
The polyisobutene comprises a high molecular weight polyisobutene and a low molecular weight polyisobutene, wherein the weight ratio of the high molecular weight polyisobutene to the low molecular weight polyisobutene is (2-5): 1.
Preferably, the polyisobutene comprises a high molecular weight polyisobutene and a low molecular weight polyisobutene, the weight ratio of the high molecular weight polyisobutene to the low molecular weight polyisobutene being (3-5): 1.
Further preferred, the polyisobutene comprises a high molecular weight polyisobutene and a low molecular weight polyisobutene, the weight ratio of the high molecular weight polyisobutene to the low molecular weight polyisobutene being 3.5:1.
The high molecular weight polyisobutylene has a molecular weight of 18 to 25 ten thousand and the low molecular weight polyisobutylene has a molecular weight of 2000 to 5000.
Preferably, the high molecular weight polyisobutylene has a molecular weight of 20 ten thousand and is purchased from basf under the trade name OppanolB, and the low molecular weight polyisobutylene has a molecular weight of 2400 and is purchased from Hengtaishenin under the trade name HT-24.
The viscosity (30 ℃) of the acrylate rubber is 10000-50000cps.
Preferably, the acrylate rubber viscosity (30 ℃) is 20000 to 50000cps.
Preferably, the acrylate rubber comprises an epoxy-terminated liquid acrylate rubber.
Further preferably, the epoxy-terminated liquid acrylate rubber has a viscosity (30 ℃) of 30000cps, available from Yuyao Hui Hongyang plastics plant, model ER-120.
The molecular weight of the halogenated butyl rubber is 8-20 ten thousand.
Preferably, the halogenated butyl rubber has a molecular weight of 10 ten thousand and is available from Dongguan Ming Yuan Plastic Co.
The mesh number of the filler is 200-2000 mesh.
Preferably, the filler has a mesh size of 800-1250 mesh.
The filler comprises one of talcum powder, precipitated barium sulfate, silicon micropowder, calcium carbonate and silicon dioxide.
Preferably, the filler comprises talcum powder and silicon dioxide, wherein the weight ratio of the talcum powder to the silicon dioxide is 1 (0.3-1).
Further preferably, the filler comprises talcum powder and silicon dioxide, and the weight ratio of the talcum powder to the silicon dioxide is 1:0.5.
Preferably, the talc is 1000 mesh, and is purchased from Guangxi Guangdong Talcum development Co., ltd, and the silica is 1000 mesh, tianjin's Di Han technology Co., ltd.
The weight ratio of the polyisobutene to the halogenated butyl rubber to the filler is 1 (0.2-0.45) to 0.1-0.35.
Preferably, the weight ratio of polyisobutene to halogenated butyl rubber to filler is 25:11:7.
The tackifier comprises at least one of liquid terpene resin, rosin resin and C5 petroleum resin.
Preferably, the tackifier comprises rosin resin, available from ataxia shun yang chemical engineering, inc.
Preferably, the antioxidant comprises 2, 6-di-tert-butyl-4-methylphenol.
The second aspect of the invention provides a viscoelastic body anti-corrosion adhesive tape and a preparation method thereof, comprising the following steps:
S1, uniformly mixing high-density polyethylene, low-density polyethylene and conductive carbon black, adding into an extruder, and extruding at 150-180 ℃ to obtain a polyolefin layer;
s2, sequentially adding polyisobutylene, halogenated butyl rubber, filler, acrylate rubber, tackifier and antioxidant, banburying, uniformly mixing and extruding to obtain a viscoelastic layer material;
and S3, heating the viscoelastic layer material to a molten state, and coating the viscoelastic layer material on the polyolefin layer through an automatic coating machine to obtain the adhesive.
The coating quantity of the coating is 10-18g/m2.
Preferably, the amount of glue applied is 14g/m2.
The banburying temperature is 110-130 ℃, and the banburying time is 25-45min.
Preferably, the temperature of the banburying is 120 ℃, and the time of the banburying is 30min.
The beneficial effects are that:
1. the weight ratio of the high-density polyethylene to the low-density polyethylene to the conductive carbon black is 75:25:2, so that the antistatic performance of the polyolefin layer can be improved, and the tensile performance of the adhesive tape can be improved.
2. The specific surface area of the conductive carbon black is 300-700m2/g, so that the antistatic performance and the processing performance of the anti-corrosion adhesive tape can be improved.
3. The weight ratio of the polyisobutene to the halogenated butyl rubber to the filler is 1 (0.2-0.45) to 0.1-0.35, so that the adhesive property of the anti-corrosion adhesive tape can be improved.
4. By adding the acrylic rubber with the viscosity of 10000-50000cps, the adhesive property and the peeling strength of the anti-corrosion adhesive tape can be further improved.
5. The polyisobutene comprises high molecular weight polyisobutene and low molecular weight polyisobutene, wherein the weight ratio of the high molecular weight polyisobutene to the low molecular weight polyisobutene is (2-5): 1, and the adhesive property and the chemical resistance of the anticorrosive material can be improved.
Detailed Description
Example 1
The viscoelastic body anti-corrosion adhesive tape comprises, by weight, a polyolefin layer, a viscoelastic body layer, wherein the polyolefin layer comprises, by weight, 75 parts of high-density polyethylene, 25 parts of low-density polyethylene and 2 parts of conductive carbon black, and the viscoelastic body layer comprises, by weight, 50 parts of polyisobutylene, 22 parts of halogenated butyl rubber, 14 parts of a filler, 4 parts of acrylate rubber, 3 parts of a tackifier and 2 parts of an antioxidant.
The polyolefin layer had a thickness of 0.45mm.
The thickness ratio of the polyolefin layer to the viscoelastic layer is 1:3.
The high density polyethylene had a melt flow index of 1.1g/10min and was purchased from medium petrifaction under the designation 3300F.
The low density polyethylene has a melt flow index of 0.33g/10min and is available from Yanshan petrochemical, brand LD165.
The specific surface area of the conductive carbon black is 400M2/g, and the conductive carbon black is purchased from Hebei ink Yu chemical industry Co Ltd, and the model is M80.
The polyisobutene is a high molecular weight polyisobutene and a low molecular weight polyisobutene, and the weight ratio of the high molecular weight polyisobutene to the low molecular weight polyisobutene is 3.5:1.
The high molecular weight polyisobutylene has a molecular weight of 20 ten thousand, and is purchased from Basoff under the trade name OppanolB, and the low molecular weight polyisobutylene has a molecular weight of 2400, and is purchased from Hengtaisheng petrochemical under the trade name HT-24.
The acrylate rubber is epoxy-terminated liquid acrylate rubber.
The epoxy-terminated liquid acrylate rubber has a viscosity (30 ℃) of 30000cps, and is purchased from Yuyao Hui Hongkang plastics factory, model ER-120.
The halogenated butyl rubber has a molecular weight of 10 ten thousand and is purchased from Dongguan city Ming Yuan plastic Co.
The filler is talcum powder and silicon dioxide, and the weight ratio of the talcum powder to the silicon dioxide is 1:0.5.
The talcum powder has a mesh number of 1000 mesh and is purchased from Guangxi Guangdong talcum development Co., ltd, and the silicon dioxide has a mesh number of 1000 mesh and is available from Tianjin Cordi-Han technology Co., ltd.
The tackifier is rosin resin, and is purchased from Jinan Shunyang chemical engineering Co.
The antioxidant is 2, 6-di-tert-butyl-4-methylphenol.
An anti-corrosion adhesive tape of a viscoelastic body and a preparation method thereof are provided, which comprises the following steps:
S1, uniformly mixing high-density polyethylene, low-density polyethylene and conductive carbon black, adding the mixture into an extruder, and extruding at 160 ℃ to obtain a polyolefin layer;
s2, sequentially adding polyisobutylene, halogenated butyl rubber, filler, acrylate rubber, tackifier and antioxidant, banburying, uniformly mixing and extruding to obtain a viscoelastic layer material;
and S3, heating the viscoelastic layer material to 180 ℃ to a molten state, and coating the viscoelastic layer material on the polyolefin layer by an automatic coating machine to obtain the adhesive.
The amount of glue applied was 14g/m2.
The banburying temperature is 120 ℃, and the banburying time is 30min.
Example 2
The specific embodiment is the same as in example 1, except that the polyolefin layer described in example 2 comprises 73 parts of high-density polyethylene, 23 parts of low-density polyethylene and 2.2 parts of conductive carbon black.
Example 3
The specific embodiment is the same as in example 1, except that the viscoelastic layer in example 3 comprises 50 parts of polyisobutylene, 24 parts of halogenated butyl rubber, 12 parts of filler, 4 parts of acrylate rubber, 3 parts of tackifier and 2 parts of antioxidant.
Comparative example 1
The specific embodiment is the same as in example 1, except that the polyolefin layer described in comparative example 1 comprises 70 parts of high-density polyethylene, 30 parts of low-density polyethylene, and 2 parts of conductive carbon black.
Comparative example 2
The specific embodiment is the same as in example 1, except that the viscoelastic layer described in comparative example 2 comprises 45 parts of polyisobutylene, 27 parts of halogenated butyl rubber, 15 parts of filler, 4 parts of acrylate rubber, 3 parts of tackifier and 2 parts of antioxidant.
Comparative example 3
Specific embodiments are the same as in example 1, except that the weight ratio of high molecular weight polyisobutene to low molecular weight polyisobutene described in comparative example 3 is 2.5:1.
Performance test method
The viscoelastic body anti-corrosive tapes obtained in examples 1 to 3 and comparative examples 1 to 3 were subjected to performance test, and the test data are shown in table 1.
1) The insulation resistivity (100 d) Ω·m2 is in accordance with DIN 3070-91.
2) Shear Strength (MPa) ISO21809-3 annex L, bonded substrate shrink tape/Steel
3) Peel strength (MPa) referring to ISO21809-3 appendix D, bonding temperature 23℃and bonding substrate PE and steel respectively.
4) Cathode stripping (mm) referring to GB/T23257-2009 appendix D, test temperature 23 ℃, test voltage-3.5V, test time 24h.
Performance test data
TABLE 1