Impact-resistant polyacrylate pressure-sensitive adhesive layer and preparation method thereof and pressure-sensitive adhesive tape

A polyacrylate and polyacrylate technology, which is applied in the field of impact-resistant pressure-sensitive adhesives, can solve the problems of difficulty in balancing production efficiency and energy consumption, and the degradation of pressure-sensitive adhesive bonding performance, so as to reduce the risk of phase separation, Improve impact resistance, strengthen the effect of bonding

Inactive Publication Date: 2020-07-24
SUZHOU SHIHUA NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some other schemes try to directly use peroxides to crosslink rubber components containing carbon-carbon double bonds and polyacrylates. However, due to the high temperature required for the reaction, it is necessary to ensure sufficient high temperature time during the preparation of pressure-sensitive adhesive tapes. It is difficult to balance production efficiency and energy consumption, and it is easy to cause excessive cross-linking to reduce the bonding performance of pressure-sensitive adhesives

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Pressure-sensitive adhesive components: 30 parts of polyacrylate polymer, the selected polyacrylate polymer has a glass transition temperature of -40 to -33°C, a molecular weight distribution of 150,000-400,000 Daltons, and a weight-average molecular weight of 30 Between -400,000 Daltons, the shear storage modulus at 23°C is 0.3-0.4 MPa, the mass percentage of carboxyl groups is 0.2-0.3 wt%, and the mass percentage content of hydroxyl groups is 0.9-1.2 wt%. 1.2 parts of permanent SBS block copolymer, graft rate 0.5-1.0%, polystyrene block ratio 13-18%, tensile strength 10-12 MPa, elongation at break 1000-1200%, weight average molecular weight 2 -40,000 Daltons; 3 parts of isocyanate curing agent, specifically L-75; 40 parts of toluene.

[0029] Preparation of pressure-sensitive adhesive: Add maleic anhydride-modified SBS to the stirred toluene, stir evenly after completely dissolving, add polyacrylate polymer, fully dissolve and stir evenly, add isocyanate curing agent ...

Embodiment 2

[0034] Pressure-sensitive adhesive components: 60 parts of polyacrylate polymer, the selected polyacrylate polymer has a glass transition temperature of -20 to -15°C, a molecular weight distribution of 500,000-900,000 Daltons, and a weight-average molecular weight of 50 Between -600,000 Daltons, the shear storage modulus at 23°C is 0.4-0.5 MPa, the mass percentage of carboxyl groups is 0.3-0.5 wt%, and the mass percentage content of hydroxyl groups is 0.4-0.7 wt%. 0.3 parts of permanent SEBS block copolymer, graft rate 1-1.6%, polystyrene block ratio 33-40%, tensile strength 18-22 MPa, elongation at break 400-600%, weight average molecular weight 4 -70,000 Daltons; 50 parts of rosin glyceride is used as the tackifying resin, and the softening point is 70-85 ° C; 0.5 parts of isocyanate curing agent, specifically N3300; 0.5 parts of four-functional epoxy curing agent; 110 parts of toluene, ethyl acetate 30 parts of ester.

[0035] Preparation of pressure-sensitive adhesive: Ta...

Embodiment 3

[0038] Pressure-sensitive adhesive components: 45 parts of polyacrylate polymer, the selected polyacrylate polymer has a glass transition temperature of -30 to -20°C, a molecular weight distribution of 300,000-600,000 Daltons, and a weight-average molecular weight of 40 Between -500,000 Daltons, the shear storage modulus at 23°C is 0.3-0.4 MPa, the mass percentage of carboxyl groups is 0.2-0.4 wt%, and the mass percentage of hydroxyl groups is 0.5-0.9 wt%. 0.7 parts of permanent SIS block copolymer, graft rate 0.6-1.3%, polystyrene block ratio 23-30%, tensile strength 13-20 MPa, elongation at break 600-1000%, weight average molecular weight 3 -60,000 daltons; 30 parts of terpene resins are selected as the tackifying resin, and the softening point is 95-110°C; 3 parts of four-functional epoxy curing agent; 90 parts of toluene, and 20 parts of methyl ethyl ketone.

[0039] Preparation of pressure-sensitive adhesive: Take all the toluene, add adipic anhydride modified SIS to the ...

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Abstract

The invention discloses an impact-resistant polyacrylate pressure-sensitive adhesive layer and a preparation method thereof and a pressure-sensitive adhesive tape. The graft-modified block copolymer is used as a cross-linking agent and is jointly used with isocyanate with three or more functionality and an epoxy curing agent, the graft-modified block copolymer is cross-linked into a polyacrylate pressure-sensitive adhesive in the glue drying, cross-linking and curing process, and the overall impact resistance is improved. The scheme is flexible to use, the formula can be adjusted in time according to actual application requirements, the segmented copolymer can be effectively prevented from being separated from polyacrylate through crosslinking, and the failure risk is reduced.

Description

technical field [0001] The invention relates to the technical field of impact-resistant pressure-sensitive adhesives, in particular to an impact-resistant polyacrylate pressure-sensitive adhesive layer, a preparation method and a pressure-sensitive adhesive tape. Background technique [0002] In the field of structural adhesives, impact resistance has become a basic performance requirement of adhesives, such as epoxy structural adhesives for automobiles, epoxy structural adhesives for mobile phones, etc. The characteristic of epoxy glue is hard and brittle. Although the bonding strength is very high, it is prone to structural damage once it is subjected to a sudden external impact. Therefore, rubber tougheners are often added to the epoxy system to improve impact resistance. In recent years, structural adhesives have been largely replaced by pressure-sensitive adhesives, so pressure-sensitive adhesives have also begun to pay more attention to impact resistance. However, th...

Claims

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Application Information

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IPC IPC(8): C09J133/04C09J11/08C09J7/38C09J7/40
CPCC09J11/08C09J133/04C09J7/385C09J7/40C08L51/006C08L53/025
Inventor 顾正青周帅周奎任陈启峰
Owner SUZHOU SHIHUA NEW MATERIAL TECH
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