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Hybrid silicon-modified acrylate emulsion, and application and preparation method thereof

An acrylate, hybrid silicon-containing technology, applied in coatings and other directions, can solve the problems of increased viscosity of gels and emulsions, instability of light, heat, oxygen, difficulty in obtaining polymerized and storage-stable emulsions with silicone additions, etc. , to achieve the effect of expanding the scope of application, good high and low temperature resistance, and simple synthesis method

Active Publication Date: 2014-10-15
广东多正树脂科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silicones such as siloxane, polysiloxane and silane coupling agent contain siloxane structure, which is easily hydrolyzed and affects the storage stability of the emulsion
The above documents use these silicones to modify acrylates. Since these silicones contain siloxane structures, the prepared acrylate hybrid emulsions have poor stability, which affects the practical application of acrylate hybrid emulsions.
[0006] Although scientific researchers at home and abroad have made in-depth research and discussion on the silicone acrylate emulsion system, the stability of the obtained modified polymer emulsion is still not good, and separation and coagulation are prone to occur. The main reasons are as follows: ① It is difficult to obtain a polymerized and storage-stable emulsion when the amount of silicone added is large; ②Due to the hydrolysis and polycondensation of the siloxane group, the premature crosslinking leads to an increase in the viscosity of the gel and emulsion; ③Added in order to improve the mechanical stability of the emulsion An appropriate amount of small acrylic molecules will promote the hydrolysis of silicon monomers containing unsaturated double bonds, and have a tendency to further self-polymerize during the emulsion polymerization process, resulting in poor storage stability of the emulsion; Exist in a free state, they absorb, contain, and disperse on the surface or inside of the emulsion polymer micelle, are unstable to light, heat, and oxygen, and will affect the stain resistance, water resistance, and weather resistance of the coating film, so the prepared The water resistance, scrub resistance and weather resistance of the paint are not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 50g of methacryloxypropyltrimethoxysilane, 12g of water, 100ml of ethanol and 1g of tetramethylammonium hydroxide pentahydrate into a three-necked flask, stir magnetically at 50°C for 48 h, and remove by rotary evaporation under reduced pressure at 50°C. Alcohol solvent to obtain the hydrolyzate; dissolve the hydrolyzate in 100ml toluene, wash the toluene solution with saturated saline solution until neutral, add magnesium sulfate pentahydrate to remove water, filter, recover toluene at 65°C, and obtain methyl octamethacrylate semisiloxane.

Embodiment 2

[0032] For one polymerization, add 1.5 parts of alkylphenol polyoxyethylene ether (OP-10) and 2 parts of sodium lauryl sulfate into a three-neck round bottom flask, add 100 parts of water, mix, add 65 parts of n-butyl acrylate, form 13 parts of methyl methacrylate, 12 parts of styrene, 5 parts of octamethyl methacrylate silsesquioxane, stirring speed 1000r / min, pre-emulsification for 30min; take 0.5 parts of ammonium persulfate, dissolve in 4 parts of water, Take 1 / 6 part of the total mass of the pre-emulsion and add it to a three-necked round-bottomed flask, slowly raise the temperature to 70°C, add ammonium persulfate, raise the temperature to 75°C, initiate polymerization, and keep it warm for 20 minutes to obtain a seed emulsion; add the remaining Pre-emulsion, control the dropping speed, drop the monomer within 2 hours, add 0.5 parts of ammonium persulfate during the period, and keep it at 90°C for 2 hours;

[0033]For secondary polymerization, add 0.5 parts of alkylpheno...

Embodiment 3

[0035] For one polymerization, add 1 part of alkylphenol polyoxyethylene ether (OP-10) and 1 part of sodium lauryl sulfate into a three-neck round bottom flask, add 80 parts of water, mix, add 30 parts of n-butyl acrylate, acrylic acid 20 parts of isooctyl ester, 40 parts of styrene, 10 parts of octamethacrylate silsesquioxane, stirring speed 500r / min, pre-emulsification for 30min; take 0.3 parts of ammonium persulfate, dissolve in 4 parts of water, take Add 1 / 10 part of the total mass of the pre-emulsion into a three-necked round-bottomed flask, slowly heat up to 70°C, add ammonium persulfate, heat up to 80°C, initiate polymerization, and keep warm for 20 minutes to obtain a seed emulsion; add the remaining pre-emulsion dropwise at 80°C Emulsion, control the dropping speed, drop the monomer within 2 hours, add 0.3 parts of ammonium persulfate during the period, and keep warm for 1 hour;

[0036] For secondary polymerization, add 0.5 parts of alkylphenol polyoxyethylene ether ...

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PUM

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Abstract

The invention discloses a hybrid silicon-modified acrylate emulsion, and application and a preparation method thereof. The hybrid silicon- modified acrylate emulsion is characterized by being prepared from a multifunctional silsesquioxane material containing a carbon-carbon double bond, an acrylate monomer, an emulsifier, water and an initiator. The preparation method does not need a catalyst, no by-product is generated, the synthetic method is simple, the product purity is high, and the cost is low. The obtained hybrid silicon-modified acrylate hybrid emulsion is stable in performances, and has extremely good high / low-temperature resistance, weatherability, water resistance and other performances.

Description

technical field [0001] The invention relates to the technical field of chemical adhesives, in particular to a water-based adhesive composition containing a hybrid silicon-modified acrylate emulsion and a preparation method thereof. Background technique [0002] Emulsion polymerization has the characteristics of low system viscosity, fast heat transfer, environmental protection and separation effect. Its products have been widely used in the fields of coatings, paints, adhesives, rubber and drug sustained-release capsule carriers. Acrylic resins refer to homopolymers, copolymers of acrylate monomers and copolymers with other vinyl monomers. Acrylate polymer is a saturated compound without residual double bonds. It has excellent UV resistance, acid and alkali resistance, oxidation resistance, adhesion, corrosion resistance and weather resistance. It is an important type and widely used in various industries such as rubber, plastics, coatings, adhesives, and fabric finishing a...

Claims

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Application Information

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IPC IPC(8): C08F220/18C08F220/14C08F212/08C08F230/08C08F2/24C09D133/08C09D125/14
Inventor 许玉良许凯李树泉郑李华罗立奉丁洪成
Owner 广东多正树脂科技有限公司
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