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

A silicone pressure-sensitive adhesive, solvent-free technology, applied in the direction of adhesives, etc., can solve the problems of pressure-sensitive adhesives such as poor initial adhesion and peel strength, and can not be used repeatedly, so as to increase toughness and other mechanical properties, avoid sticking, The effect of high peel strength

Active Publication Date: 2014-08-13
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
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Effect test

preparation example Construction

[0062] The present invention also provides a method for preparing a pressure-sensitive adhesive, which includes the following steps:

[0063] Step 1: Prepare MQ resin.

[0064] Because MQ silicone resin has a complex three-dimensional spherical structure, it has two similar chain links. Among them, the organic chain link can improve the compatibility with silicone rubber and increase the viscosity. 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 that affect the performance of silicone pressure-sensitive adhesive are: (1) M / Q ratio: It determines the molecular weight and hydroxyl content of silicone resin. Generally suitable M / The Q ratio is between 0.6 and 0.9, M / Q 0.9, it has good compatibility with silicone rubber, but the cohesion is decreased. (2) Hydroxyl content: It affects the degree of reaction with silicone rubber, as well as the...

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 prepared in the relevant examples, 15 parts of polyisobutylene (viscosity of 1200mPa·s) and 150 parts of simethicone (viscosity of 500mPa·s) were mixed and stirred evenly to obtain Gum base. Then divide it into two equal parts A and B. Add 0.6 parts of platinum catalyst (Square Silicone CA28, platinum content 2000ppm) to A and mix them, and add 3 parts of hydrogen-containing silicone oil (hydrogen content of 0.25wt%) to part B. And 0.001 part inhibitor and mix well. Part A and part B are mixed uniformly, and cured at 150° C. for 3 minutes (min) to obtain a pressure-sensitive adhesive. This pressure-sensitive adhesive has good viscosity, fine and uniform micropores, softer rubber after curing, and better peel strength. After leaving the pressure-sensitive adhesive for 6 months, ...

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 its adhesion after being left for 3 days.

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Abstract

Disclosed is a solventless silicone pressure sensitive adhesive, comprising: 100 parts by mass of a polydimethylsiloxane having an alkenyl group as an end group; 1 to 300 parts by mass of a polydimethylsiloxane having a hydroxyl group as an end group; 1 to 50 parts by mass of MQ resin; 1 to 30 parts by mass of polyisobutylene, 20 to 200 parts by mass of a diluent; 0.1 to 5 parts by mass of a crosslinking agent and a platinum catalyst capable of solidifying the silicone pressure sensitive adhesive. Also disclosed is a preparation method for the silicone pressure sensitive adhesive. The silicone pressure sensitive adhesive disclosed has the characteristics of good initial tackiness, long effectiveness, suitable peel-off strength and good drug permeability, is non-toxic and environmentally-friendly, is capable of repeated use, can be made into pressure sensitive adhesive tapes, pressure sensitive adhesive strips for medical use, as well as other functional materials where such pressure sensitive properties are required.

Description

Technical field [0001] The invention relates to an organosilicon pressure-sensitive adhesive and a preparation method thereof, in particular to a solvent-free organosilicon pressure-sensitive adhesive with good initial tack, long-term performance, suitable peeling strength and drug permeability. Background technique [0002] Pressure Sensitive Adhesive (PSA) adhesive is an adhesive that can achieve good adhesion in a short time by applying finger pressure. It can wet the surface as quickly as a fluid and prevent peeling like a solid. It is widely used in the production of adhesive tapes, pressure-sensitive labels, sanitary products and other similar products. The typical characteristics of pressure-sensitive adhesives are its shear strength, peel strength, adhesion and adhesive transferability (that is, the amount of adhesive remaining after removing the tape). Silicone pressure-sensitive adhesives not only have the good bonding strength and initial adhesion necessary for pressu...

Claims

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Application Information

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Patent Type & Authority Patents(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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