Solvent-free organic silicon pressure-sensitive adhesive and preparation method thereof

A silicone pressure-sensitive adhesive, solvent-free technology, used in adhesives and other directions, can solve the problems of non-reusable, poor initial tack and peel strength of pressure-sensitive adhesives, avoid stickiness, increase toughness and other mechanical properties, Wide range of effects

Active Publication Date: 2011-09-07
SHENZHEN CITY SQUARE SILICONE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a solvent-free silicone pressure-sensitive adhesive with good initial adhesion, long-term effect, suitable peel strength and drug release, and a reusable solvent-free pressure-sensitive adhesive and its preparation method. Solve the problems of traditional pressure-sensitive adhesives such as poor initial adhesion and peel strength, and repeated use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0062] The present invention also provides a kind of preparation method of pressure-sensitive adhesive, and this preparation method comprises the steps:

[0063] Step 1: Prepare MQ resin.

[0064] Because MQ silicone resin has a complex three-dimensional spherical structure, it has two kinds of chain links. The organic chain link can improve the compatibility with silicone rubber and play a role in thickening. The siloxane chain link has a certain effect on silicone rubber. The reinforcing effect can improve the cohesive strength of the pressure sensitive adhesive. MQ silicone resin is the main component of silicone pressure-sensitive adhesive. The main factors affecting the performance of silicone pressure-sensitive adhesive are: (1) M / Q ratio: it determines the molecular weight and hydroxyl content of silicone resin. The Q ratio is between 0.6 and 0.9, M / Q0.9, good compatibility with silicone rubber, but lower cohesion. (2) Hydroxyl content: It affects the degree of reacti...

Embodiment 1

[0078] 100 parts of vinyl-terminated polydimethylsiloxane (viscosity of 1000mPa·s), 75 parts (about 20.5wt%) of hydroxyl-terminated polydimethylsiloxane (viscosity of 1200mPa s), 25 parts of MQ resin obtained in related examples, 15 parts of polyisobutylene (viscosity is 1200mPa s) and 150 parts of simethicone oil (viscosity is 500mPa s) are mixed, stirred evenly to obtain base glue. Then it is divided into A and B two equal parts, add 0.6 part of platinum catalyst (Square Silicone company CA28, platinum content 2000ppm) and mix in A, add 3 parts of hydrogen-containing silicone oil (hydrogen content is 0.25wt%) in B part and 0.001 part inhibitor and mix well. Mix parts A and B evenly, and cure at 150° C. for 3 minutes (min) to obtain a pressure-sensitive adhesive. This pressure-sensitive adhesive has good viscosity, fine and uniform micropores, and the glue is soft after curing and has good peel strength. After the pressure-sensitive adhesive was placed for 6 months, the ta...

Embodiment 2

[0080] The preparation method is the same as in Example 1, except that MQ resin is not added. The pressure-sensitive adhesive prepared in this way has poor viscosity and obviously loses viscosity after being placed for 3 days.

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Abstract

The invention relates to a solvent-free organic silicon pressure-sensitive adhesive. The organic silicon pressure-sensitive adhesive comprises the following components in part by mass: 100 parts of polydimethylsiloxane of which the end group is alkenyl; 1 to 300 parts of polydimethylsiloxane of which the end group is hydroxyl; 1 to 50 parts of MQ resin, 1 to 30 parts of polyisobutylene, 20 to 200 parts of diluting agent, 0.1 to 5 parts of crosslinking agent and a platinum catalyst capable of curing the organic silicon pressure-sensitive adhesive. The invention also relates to a preparation method of the organic silicon pressure-sensitive adhesive. The organic silicon pressure-sensitive adhesive has the characteristics of high initial tack, long residual action, proper peeling strength, drug penetration and the like, is nontoxic, environmentally-friendly and reusable, and can be prepared into pressure-sensitive adhesive tapes, medical pressure-sensitive adhesive strips and other functional materials requiring the pressure-sensitive performance.

Description

technical field [0001] The invention relates to an organic silicon pressure-sensitive adhesive and a preparation method thereof, in particular to a solvent-free organic silicon pressure-sensitive adhesive with good initial tack, long-lasting performance, suitable peel strength and drug release. Background technique [0002] Pressure Sensitive Adhesive (PSA) adhesive is an adhesive that can achieve a good adhesion effect in a short time only by applying finger pressure. It wets surfaces quickly like a fluid and resists peeling like a solid, and is widely used in the production of adhesive tapes, pressure sensitive labels, hygiene products, and other similar products. A pressure sensitive adhesive is typically characterized by its shear strength, peel strength, tack, and adhesive transfer (ie, the amount of adhesive remaining after the tape is removed). Silicone pressure-sensitive adhesives not only have the necessary good bonding strength and initial tack for pressure-sensit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/07C09J183/06C09J123/20
CPCC08G77/20C09J183/04C08G77/70C08G77/16C08L83/00C08L2666/08
Inventor 李彦民
Owner SHENZHEN CITY SQUARE SILICONE MATERIALS
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