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Preparation method of in-situ nano compounded silicone propyl emulsion

A silicon-acrylic emulsion and nano-composite technology, which is applied in the field of in-situ nano-composite silicon-acrylic emulsion preparation, can solve the problems of unsuitable high-performance coatings, unstable system, particle size matching, etc., to reduce the use of VOC-containing additives, The effect of solving particle size matching and improving water resistance

Inactive Publication Date: 2003-02-05
上海华实纳米材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this simple mechanical blending method has problems such as system instability, easy phase separation, and particle size matching, and is not suitable for high-performance coatings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 is the preparation of pure acrylic nanoemulsion; Embodiment 2-8 is the preparation of functional nanoemulsion; Embodiment 9 is the preparation of in-situ nanocomposite silicon acrylic emulsion.

[0024] Example 1.

[0025] Add water 744g in the four-neck flask with condenser, dropping funnel, stirrer, thermometer, add active ingredient and be 92% anionic emulsifier sodium lauryl sulfate 14.0g, add auxiliary emulsifier ethanol 2.0g, stir Raise the temperature to 65°C, add 20g of mixed monomers, pre-emulsify at 65°C for 30 minutes, raise the temperature to 75°C, add an initiator (0.5g ammonium persulfate dissolved in 10g water), after 10 minutes the system becomes light blue and transparent, continue Add the remaining mixed monomer and initiator solution (0.2g of ammonium persulfate dissolved in 10g of water) dropwise, complete the addition in 3-5 hours, keep the reaction at 80°C for 2 hours, cool down, neutralize with concentrated ammonia water, and obtain t...

Embodiment 3

[0028] The monomer mixture is 2g of glycidyl methacrylate, 68.2g of methyl methacrylate, and 68.2g of butyl acrylate. Other formulations and processes are the same as in Example 1 to obtain a functional nanoemulsion with an average particle size of 10-120nm. Glycidyl methacrylate is a functional monomer.

Embodiment 4

[0030] The monomer mixture is 2 g of hydroxyethyl methacrylate, 68.2 g of methyl methacrylate, and 68.2 g of butyl acrylate. Other formulations and processes are the same as in Example 1 to obtain a functional nanoemulsion with an average particle size of 10-120 nm, wherein Hydroxyethyl methacrylate is a functional monomer.

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PUM

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Abstract

The preparation method of in-situ nano compound silicon acrylic acid emulsion is characterized by that the nano pure acrylic acid emulsion is used as core, the mixture of organic silicone monomer and (methyl) acrylic acid monomer is used as shell, in the water medium the free radical emulsion copolymerization can be implemented to form core / shell structure; and a functional nano emulsion containing hydroxyl group or amino group or epoxy group or aldehyde group and organic tin catalyst of coupling agent are added in the course of the described emulsion polymerization or after polymerization to make its particles and shell layer of core / shell silicon acrylic acid colloidal particles produce the actions of functional nano emulsion colloidal particles fix on the cover the surface of core / shell silicon acrylic acid emulsion colloidal particles to implement in-situ composition.

Description

technical field [0001] The invention relates to a preparation method of an in-situ nanocomposite silicon-acrylic emulsion used for producing water-based coatings. Background technique [0002] Coatings with (meth)acrylic acid and its ester copolymers as the main film-forming substances are commonly called acrylic coatings. Acrylic paint has the advantages of full film and high mechanical strength, and has a wide range of applications in the field of paint. However, with the rise of modern high-rise buildings, higher and higher requirements are put forward for the weather resistance and stain resistance of architectural coatings. Acrylic coatings, such as "pure acrylic" and "styrene acrylic" coatings, cannot meet these requirements. [0003] In polymers, the Si-O bond energy (450kJ / mol) of silicone resin is much greater than the C-C bond energy (345kJ / mol) and C-O bond energy (351kJ / mol), which has excellent high temperature resistance and UV resist...

Claims

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Application Information

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IPC IPC(8): C08F2/26C08F265/06
Inventor 杨慕杰刘玉阳黄德欢
Owner 上海华实纳米材料有限公司
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