Silica sol reinforced water-based organic silicone elastomer as well as preparation method and application thereof

A technology of organosilicon and silica sol, which is applied in chemical instruments and methods, adhesives, and other chemical processes, and can solve problems such as poor mechanical properties, difficulty in cleaning hands and utensils in contact with silicone rubber, and non-adhesion to wet substrates. , to achieve good mechanical strength, compatibility and reinforcement performance, good fluidity and coating effect

Active Publication Date: 2014-07-02
国科广化(南雄)新材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, conventional room temperature vulcanized silicone elastomers have the following disadvantages: hands and utensils that come into contact with silicone rubber are difficult to clean with water; difficult to handle and place in a given shape; cannot be painted; do not adhere to wet substrates; Occasionally emits an unpleasant odor, which limits its use in certain areas
Furthermore, the mechanical properties of polysiloxane elastomers are poor, and it is often necessary to add silicon dioxide (SiO 2 ), zeolite, polysilsesquioxane, carbon nanotubes, silica and other fillers for reinforcement
Fumed silica is often used as a reinforcing filler for non-water-based PDMS; for water-based polysiloxane, it is difficult to apply because of its poor interfacial compatibility, rapid viscosity rise, and small addition amount

Method used

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  • Silica sol reinforced water-based organic silicone elastomer as well as preparation method and application thereof
  • Silica sol reinforced water-based organic silicone elastomer as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030](1) Add 1g of octadecyltrimethylammonium chloride, 0.5g of potassium hydroxide and 1g of isomeric tridecyl alcohol polyoxyethylene ether into a 500mL glass cup, and dissolve them in 65.5g of water. After the dissolution is complete, add 30g of octamethylcyclotetrasiloxane (D4), stir to make it evenly mixed, then shear and emulsify in a shear emulsification mixer at a shear rate of 1000 rpm for 10 minutes, transfer the resulting mixture to a high-pressure homogeneous In the machine, homogenize under 40MPa homogeneous pressure for 3 times, then pour into a 500mL four-necked flask, heat to 60°C, continue stirring at 500 rpm for 10min, and react for 5 hours to obtain a linear polysiloxane emulsion ;

[0031] (2) Cool the above-mentioned linear polysiloxane emulsion to 50°C, add 1.5g of tetraethyl orthosilicate and 0.5g of 40nm colloidal silica sol in sequence, and continue the constant temperature reaction for 3 hours to obtain a silicone elastomer with a certain viscosity ...

Embodiment 2

[0034] (1) Add 1.5g of octadecyltrimethylammonium chloride, 1.5g of potassium hydroxide and 0.5g of isomeric tridecyl alcohol polyoxyethylene ether into a 500mL glass cup, dissolve with 65.0g of water, and wait until fully dissolved , add 30g of octamethylcyclotetrasiloxane (D4), stir to make it evenly mixed, then shear and emulsify at a shear rate of 3000 rpm for 10 minutes in a shear emulsification mixer, and transfer the resulting mixture to high pressure In the homogenizer, homogenize for 3 times under 40MPa homogenizing pressure, pour it into a 500mL four-necked flask, heat to 65°C, keep stirring at 500 rpm for 10min, and react for 6 hours to obtain linear polysiloxane alkane emulsion;

[0035] (2) Cool the above-mentioned linear polysiloxane emulsion to 55°C, add 1.5g of γ-aminopropyltriethoxysilane and 1.0g of 50nm colloidal silica sol in sequence, and continue the constant temperature reaction for 2.5 hours to obtain a certain viscosity Silicone elastomer emulsion;

...

Embodiment 3

[0038] (1) Add 1.5g of octadecyltrimethylammonium chloride, 1.0g of sodium hydroxide and 1.5g of isomeric tridecyl alcohol polyoxyethylene ether into a 500mL glass cup, dissolve with 64.0g of water, and wait until fully dissolved , add 30g octamethylcyclotetrasiloxane (D 4 ), stirred to make it evenly mixed, and then sheared and emulsified in a shear emulsifying mixer at a shear rate of 5000 rpm for 10 minutes, and transferred the resulting mixture to a high pressure homogenizer, and homogenized under a homogenizing pressure of 30MPa After 2 times, pour it into a 500mL four-neck flask, heat to 70°C, keep stirring at 500 rpm for 10min, and react for 7 hours to obtain a linear polysiloxane emulsion;

[0039] (2) Cool the above-mentioned linear polysiloxane emulsion to 60°C, add 2.0g tetraethyl orthosilicate and 1.5g silica sol with a colloidal particle size of 60nm in sequence, and continue the constant temperature reaction for 3 hours to obtain a silicone elastomer with a certa...

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Abstract

The invention belongs to the field of organic silicone elastomers and discloses a silica sol reinforced water-based organic silicone elastomer as well as a preparation method and application thereof. The preparation method comprises the following steps: polymerizing organosiloxane monomers in the presence of a composite surfactant and a catalyst to obtain a linear polysiloxane emulsion, adding a cross-linking agent and a reinforcing agent in sequence to obtain an organic silicone elastomer emulsion, coating a matrix with the emulsion, and drying for forming to obtain the organic silicone elastomer. The organic silicone elastomer is prepared through an aqueous emulsion polymerization method in the presence if good-compatibility silica sol serving as the reinforcing agent, has the advantages of good flowability, convenience in coating and good mechanical property, and can be used as a waterproof coating, a fabric coating, an adhesive, putty or a sealing agent.

Description

technical field [0001] The invention belongs to the field of silicone elastomers, and in particular relates to a silica sol-reinforced water-based silicone elastomer and a preparation method and application thereof. Background technique [0002] Polysiloxane is a commonly used chemical product. Because polysiloxane molecules contain both inorganic structures and organic groups, this molecular characteristic that combines the characteristics of inorganic and organic substances makes polysiloxane elastic. The body exhibits excellent lubricity, hydrophobicity, good flexibility, excellent air permeability, moisture resistance and excellent physiological inertia. Polydimethylsiloxane (PDMS) is the dominant polysiloxane product, especially its room temperature vulcanized elastomer has good elasticity, high and low temperature resistance, weather resistance and chemical stability. It is easy to use as it solidifies into an elastomer when pressed, and has been widely used as an adh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K3/36C08K5/5415C08K5/544C08K5/5435C08K5/548C09D183/04D06M15/643C09J183/04C09D5/34C09K3/10
Inventor 沈敏敏翟俊菱孙淳宁王俊凤
Owner 国科广化(南雄)新材料研究院有限公司
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