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Reworkable TPU substrate pressure-sensitive adhesive under load-bearing condition and equipment using the same

A technology of pressure-sensitive adhesives and substrates, applied in the direction of pressure-sensitive films/sheets, adhesives, film/sheet-shaped adhesives, etc., can solve problems such as low tensile properties, complicated processes, and damage to parts, and achieve excellent Adhesive performance, simple production process, cost reduction effect

Inactive Publication Date: 2020-03-06
SUZHOU SHIHUA NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when these parts are rebuilt or reworked, they can only be violently removed from the front or cut the foam from the middle with a knife and then remove the residual tape by stretching. The foam scraps generated in this process will be Contamination of some precision parts, but also easy to cause damage to parts
Most of the existing removable foam double-sided adhesives need to combine the stretched film and foam as the base material by hot pressing or special glue, which is complicated in process and high in cost.
In addition, the existing TPU-based reworkable tape is made of ordinary glue, and its overall tensile properties are relatively low (tensile strength < 20MPa, elongation at break < 1000%) and cannot bear the weight of large-sized parts. Breakage will occur during the debonding process of heavy industry under load conditions, so it can only be used for bonding and fixing small parts and mobile phone batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Modification of thermoplastic elastomer: 8 parts by mass of styrene-butadiene-styrene (SBS) block copolymer, 2 parts of maleic anhydride, 0.01 part of azobisisobutyronitrile and 80 parts of toluene were added to In the reaction vessel, after heating to 70°C, react for 1 hour, stop the reaction and wait for the reaction solution to return to room temperature, add the reaction solution dropwise into acetone for precipitation, filter, and vacuum dry to obtain the modified thermoplastic elastomer A1.

[0032] The prepared modified thermoplastic elastomer A1 is a linear polymer with a tensile strength of 25MPa, an elongation at break of 1000%, a hardness of Shore A of 75, a specific gravity of 0.91g / cm3, and a styrene content of 25-35%. , the diblock content is 1-15%, and the grafting rate is 8%.

[0033] Preparation of reworkable TPU substrate pressure-sensitive adhesive under load: 75 parts of modified thermoplastic elastomer A1, 15 parts of rosin resin with a softening po...

Embodiment 2

[0038] Modification of SBS thermoplastic elastomer: 9 parts of styrene-butadiene-styrene (SBS) block copolymer, 2 parts of methyl methacrylate, 0.015 parts of azobisisobutyronitrile and 90 parts by mass Add toluene into the reaction vessel, heat to 80°C, react for 1.5h, stop the reaction and wait for the reaction solution to return to room temperature, drop the reaction solution into acetone for precipitation, filter, and vacuum dry to obtain thermoplastic elastomer A2.

[0039] The prepared modified thermoplastic elastomer A2 is a linear polymer with a tensile strength of 26MPa, an elongation at break of 1000%, a hardness of Shore A 73, a specific gravity of 0.92g / cm3, and a styrene content of 25-35%. , the diblock content is 1-15%, and the grafting rate is 9%.

[0040]Preparation of heavy-duty TPU-based pressure-sensitive adhesive under load: 75 parts of modified thermoplastic elastomer A2, 20 parts of rosin resin with a softening point of 20°C, and 75 parts of terpene-pheno...

Embodiment 3

[0045] Modification of SBS thermoplastic elastomer: 8 parts by mass of styrene-butadiene-styrene (SBS) block copolymer, 2 parts of methyl acrylate, 0.01 part of benzoyl peroxide and 80 parts of toluene were added to In the reaction vessel, after heating to 80°C, react for 2 hours, stop the reaction and wait for the reaction solution to return to room temperature, add the reaction solution dropwise into acetone for precipitation, filter, and vacuum dry to obtain thermoplastic elastomer A3.

[0046] The prepared modified thermoplastic elastomer A3 is a linear polymer with a tensile strength of 28MPa, an elongation at break of 1000%, a hardness of Shore A 73, a specific gravity of 0.92g / cm3, and a styrene content of 25-35%. , the diblock content is 1-15%, and the grafting rate is 9%.

[0047] Preparation of modified SBS thermoplastic elastomer glue and preparation of TPU double-sided adhesive: 85 parts of modified thermoplastic elastomer A3, 25 parts of terpene phenol resin with ...

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Abstract

The invention provides a preparation method of a reworkable TPU substrate double-sided adhesive tape under a load-bearing condition. The reworkable TPU substrate double-sided adhesive tape comprises aTPU substrate layer, modified pressure-sensitive adhesive layers on both sides and outer release layers. By means of graft modification on a thermoplastic pressure-sensitive adhesive layer, the TPU double-sided adhesive tape also has high tensile strength (greater than 60MPa) and elongation at break (greater than 1200%) on the basis of high bonding strength, excellent high-temperature resistanceand excellent warping resistance, and can be suitable for bonding of planes and various curved surfaces; the TPU substrate double-sided adhesive tape has excellent anti-shearing force performance, good buffer performance, and high and lasting adhesive force to the surfaces of aluminum plates, aluminum oxide plates, PC, Glass, stainless steel, ABS and various materials; under a load-bearing condition, through simple integral stretching, the adhesive tape can be rapidly removed from the surfaces of various materials without residue conveniently and rapidly, and has no pollution or damage to parts; the double-sided adhesive tape is not only suitable for bonding and reworking of mobile phone batteries, tablet personal computers and other small parts, and also is expected to replace foam double-sided adhesive tape for large-area (like large-size televisions) bonding, assembly and rapid reworking of large-size parts in electronic products.

Description

technical field [0001] The invention relates to the field of adhesives, in particular to a reworkable TPU substrate pressure-sensitive adhesive under load conditions and equipment using the pressure-sensitive adhesive. Background technique [0002] In recent years, electronic products such as smartphones, computers, and televisions have been updated faster and faster, the body has become thinner and lighter, and the size of the display screen has become larger and larger. People have higher requirements for the clarity, size, and visual effects of smart display images, and large-size liquid crystal displays are increasingly becoming the first choice of consumers. Therefore, it has good bonding performance when bonding, and can be quickly removed without residue during rework. The application of reworkable tapes is becoming more and more extensive. [0003] Removable foam double-sided adhesive has the characteristics of excellent cushioning performance, excellent sealing per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/25C09J7/38C09J151/00C09J11/08C08F287/00C08F222/06C08F220/14C08F220/18C08F220/06
CPCC08F287/00C08L2205/025C08L2205/035C09J11/08C09J151/006C09J2451/00C09J2475/006C09J7/25C09J7/381C09J7/385C09J2301/124C09J2301/312C08L93/04C08L45/00C08F222/06C08F220/14C08F220/06
Inventor 顾正青赵肖宁周奎任陈启峰
Owner SUZHOU SHIHUA NEW MATERIAL TECH