Preparation method of novel polyurethane-modified organic silica gel

A polyurethane modification, polyurethane prepolymer technology, applied in the field of silicone, can solve the problems of poor resin hardness stability and mechanical properties, difficult durability, poor adhesion, etc., to achieve excellent weather resistance, fast mechanical strength, phase Good capacitive effect

Inactive Publication Date: 2012-04-18
ZHEJIANG JINGYE BIOCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, adding alkoxy-containing segment polymers to polyester resins by physical blending can improve the flexibility of the paint film, but it will have a negative impact on the hardness stability and mechanical properties of the resin, making it difficult to meet high requirements. The requirements for high-quality resin will inevitably affect its application field; Chinese patent CN102031697A reports the preparation method of polyester / polyether modified silicone oil ternary copolymerization fabric finishing agent. Static, stain resistance, but because it does not have reactive active groups, it is difficult to establish a durable bond between polyesters, poor adhesion

Method used

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  • Preparation method of novel polyurethane-modified organic silica gel
  • Preparation method of novel polyurethane-modified organic silica gel
  • Preparation method of novel polyurethane-modified organic silica gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The steps of preparing polyurethane modified silica gel are as follows:

[0032] (1) Preparation of amino-terminated silicone:

[0033] Put octamethylcyclotetrasiloxane and tetramethyldisiloxane into the reaction kettle at a mass ratio of 4:1, stir and react at 65°C for 0.5h, and then add 0.0005% of the total mass of the reactants Concentrated sulfuric acid with a mass fraction of 98%, at a temperature of 70°C, carried out an equilibrium reaction for 3 hours, then neutralized with anhydrous sodium carbonate, filtered and vacuumized to obtain a methyl hydrogen-containing siloxane intermediate; The prepared methyl hydrogen-containing siloxane intermediate and allyl glycidyl ether were put into the reaction kettle at a mass ratio of 1:1.5, stirred and reacted at 70°C for 3 hours, and then added dropwise to account for 0.00005% of the total mass of the reactants The platinum catalyst was reacted for 3 hours to obtain a diepoxy-terminated silicone oil; the diepoxy-terminate...

Embodiment 2

[0040] The steps of preparing polyurethane modified silica gel are as follows:

[0041] (1) Preparation of amino-terminated silicone:

[0042] Put octamethylcyclotetrasiloxane and tetramethyldisiloxane into the reactor at a mass ratio of 9:1, stir and react at 70°C for 1 hour, and then add 0.25% mass fraction of the total mass of the reactants It is 98% concentrated sulfuric acid, and at a temperature of 70°C, carry out an equilibrium reaction for 5 hours, and then neutralize it with anhydrous sodium carbonate, filter and vacuumize to obtain a methyl hydrogen-containing siloxane intermediate; The methyl hydrogen-containing siloxane intermediate and allyl glycidyl ether are put into the reactor at a mass ratio of 1:3, stirred and reacted at 60°C for 3 hours, and then 0.0005% of the total mass of the reactant is added dropwise. The catalyst was reacted for 3 hours to obtain diepoxy-terminated silicone oil; the diepoxy-terminated silicone oil and difunctional amino-terminated p...

Embodiment 3

[0049] The steps of preparing polyurethane modified silica gel are as follows:

[0050] (1) Preparation of amino-terminated silicone:

[0051] Put octamethylcyclotetrasiloxane and tetramethyldisiloxane into the reactor at a mass ratio of 19:1, stir and react at 60°C for 0.75h, and then add 0.0005% of the total mass of the reactants Concentrated sulfuric acid with a fraction of 98%, at a temperature of 60°C, conduct an equilibrium reaction for 7 hours, then neutralize with anhydrous sodium carbonate, filter and vacuumize to obtain a methyl hydrogen-containing siloxane intermediate; The obtained methyl hydrogen-containing siloxane intermediate and allyl glycidyl ether were put into the reactor at a mass ratio of 1:3, stirred and reacted at 75°C for 3 hours, and then added dropwise 0.0003% of the total mass of the reactants The platinum catalyst was stirred and reacted for 2 hours to obtain diepoxy-terminated silicone oil; the diepoxy-terminated silicone oil and the difunctiona...

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Abstract

The invention provides a preparation method of novel polyurethane-modified organic silica gel. The novel polyurethane-modified organic silica gel is a segmented copolymer comprising polyurethane chain segments, polyether chain segments and organic silicon chain segments. Through introduction of the polyurethane chain segments, the novel polyurethane-modified organic silica gel retains excellent weatherability, electric insulativity, hear resistance, stain resistance, gloss and color retention, vibratrion impact resistance, adhesiveness, solvent resistance, flexibility, chemical corrosion resistance and water resistance, and short curing time, and the adhesion between the novel polyurethane-modified organic silica gel and terylene or polyester/cotton fabric is effectively improved. Throughintroduction of an amino active group-containing cross-linking agent, the novel polyurethane-modified organic silica gel has the advantages of excellent gloss retention, cohesiveness, electric insulativity and hear resistance, high surface hardness, good bending resistance, fast curing speed, good tearing resistance and no efflorescence. The novel polyurethane-modified organic silica gel as a segmented copolymer has a controllable structure, greatly develops polyurethane-modified silica gel performances and widens a polyurethane-modified silica gel application scope.

Description

technical field [0001] The invention relates to the technical field of silica gel, in particular to a preparation method of silica gel modified with polyurethane. Background technique [0002] Silica gel has excellent high and low temperature resistance, weather resistance, water repellency, electrical insulation and other properties and a very wide temperature range. An important material that is indispensable in daily life. [0003] However, there are still a series of problems in the performance of silica gel, such as poor solvent resistance, poor mechanical strength, extreme wear resistance, and high curing temperature. Especially when the film is coated on a polyester substrate, its adhesion is poor, which greatly affects the performance of silica gel. The scope of application of silica gel is limited. Polyurethane resin has good vibration and shock resistance, adhesion, solvent resistance, flexibility and chemical corrosion resistance, so polyurethane-modified silica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/46C08G77/458C08G18/61C08G18/12C08G77/388
Inventor 傅越江钟少锋吴幼泉徐永达吴仁妹黄小军
Owner ZHEJIANG JINGYE BIOCHEM
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