Emulsion type organic silica pressure-sensitive gel and preparation method thereof

A silicone pressure-sensitive adhesive and emulsion-type technology, which is applied in the direction of adhesives, film/sheet adhesives, etc., can solve the problem that the elastomer film does not have the unique properties of pressure-sensitive adhesives, and achieve good initial tack and adhesion The effect of intensity

Inactive Publication Date: 2008-05-14
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The elastomer emulsions prepared in the above literature are mainly used as high-grade waterproof coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of Example 1 Hydroxyl-terminated Polydimethylsiloxane Emulsion

[0032] Add 1.5g sodium dodecylsulfonate and 1.5g OP-10 to 56g water to dissolve respectively, add 1.5g sulfonic acid to adjust the pH value of the aqueous solution, add 35g octamethylcyclotetrasiloxane dropwise to the aqueous solution under high-speed stirring , forming a stable pre-emulsion. The emulsion was reacted at 80°C for 5h and at 60°C for 24h. After cooling, neutralize with 1.5g 50% triethanolamine, obtain the polydimethylsiloxane emulsion 100g that solid content is 40%, emulsion viscosity 2 * 10 4 mm 2 / s.

Embodiment 2

[0033] The preparation of embodiment 2MQ resin emulsion

[0034] Add 180g of water, 120g of concentrated HCl, 40g of ethanol and 250g of hexamethyldisiloxane into the three-neck flask, start stirring, control the temperature at 70°C, heat in a water bath for 30min, slowly add 70g of ethyl silicate dropwise, and control the dropping time More than 1h, continue to stir for 30min after the dropwise addition to carry out co-hydrolysis, add the extractant toluene to extract the reaction product, then reflux at 76°C, control the reflux time for 3h; stop heating and stirring, pour the reacted solution into a separatory funnel, Stand for stratification; separate the lower aqueous solution, wash the upper toluene solution with water until the pH is neutral, then dry it with anhydrous calcium chloride until it is clear and transparent, heat the oil bath to 120°C, distill the organic solution, and evacuate to distillate Most of the solvent was removed to obtain 120 g of white powdery MQ ...

Embodiment 3

[0036] Embodiment 3 Preparation of emulsion-type silicone pressure-sensitive adhesive

[0037] In the there-necked flask, add 50 g of hydroxyl-terminated polydimethylsiloxane emulsion prepared in Example 1, 50 g of MQ resin emulsion prepared in Example 2, 2 g of aminopropyltriethoxysilane, 2 g of organotin catalyst emulsion (containing Dibutyltin dilaurate (0.2 g), stirred and mixed at room temperature, adjusted the pH of the mixed emulsion with ammonia water to be greater than 9, reacted at 80° C. for 3 hours, and obtained the product after cooling. Solid content 40%, peel strength 6N / 25cm.

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Abstract

The invention belongs to the technical field of silicone pressure-sensitive adhesive preparation, and in particular relates to an emulsion-type silicone pressure-sensitive adhesive and a preparation method thereof. It is composed of silicone rubber emulsion, MQ silicone resin emulsion, crosslinking agent and organic tin catalyst. The weight ratio of MQ silicone resin to silicone rubber is (40-70): (60-30), and the amount of crosslinking agent added is MQ silicone resin and 1% to 10% of the total weight of silicone rubber, the amount of organotin catalyst added is 0.1% to 1% of the total weight of MQ silicone resin and silicone rubber, wherein, MQ silicone resin is combined with hexamethyldisiloxane as M group and As the Q group, tetraethyl orthosilicate or water glass is hydrolyzed and condensed, the molar ratio of M group to Q group is (0.6~1.0):1, and the number average molecular weight Mn of MQ silicone resin is 2000~6000 ; The crosslinking agent is an organosiloxane crosslinking agent with three active functional groups. The organosiloxane emulsion synthesized by the invention solidifies after water evaporation to form a pressure-sensitive adhesive elastomer film with good initial tack and cohesive strength.

Description

technical field [0001] The invention belongs to the technical field of silicone pressure-sensitive adhesive preparation, and in particular relates to an emulsion-type silicone pressure-sensitive adhesive and a preparation method thereof. Background technique [0002] Silicone pressure-sensitive adhesive is a new type of adhesive with broad development prospects. It not only has the good bond strength and initial tack necessary for pressure-sensitive adhesives, but also has many unique properties: (1) Good adhesion to high-energy and low-energy surface materials (2) Outstanding high and low temperature resistance , can be used for a long time between -73°C and 296°C. (3) It has good chemical inertness, long service life, and outstanding moisture resistance and electrical properties. (4) It has certain liquid permeability and biological inertness, and can be used for bonding therapeutic drugs to human skin. [0003] Silicone pressure-sensitive adhesive PSA is usually made o...

Claims

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Application Information

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IPC IPC(8): C09J7/02C09J183/00
Inventor 高群王国建
Owner TONGJI UNIV
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