Silicone-acrylate emulsion with high organosilicon content and preparation method thereof

A silicon content, high organic technology, applied in the field of emulsion polymerization, can solve the problems of poor compatibility, low effective binding amount, easy phase separation, etc.

Active Publication Date: 2013-11-06
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of synthesizing silicone-modified acrylate emulsion, due to the poor compatibility between PDMS and polyacrylate, phase separation easily occurs during synthesis and film formation, especially under the condition of high silicone content. , oil floating or coagulation often occurs, the effective binding amount is not high, and large-scale phase separation leads to low light transmittance of the coating film

Method used

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  • Silicone-acrylate emulsion with high organosilicon content and preparation method thereof
  • Silicone-acrylate emulsion with high organosilicon content and preparation method thereof
  • Silicone-acrylate emulsion with high organosilicon content and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0015] (1) Dissolve 1.20g of DBSA, 2.01g of 30wt% SE-10N and 0.20g of PE6100 in 130g of deionized water as the composite emulsifier, then transfer it to the reactor, and raise the temperature to 80°C under continuous stirring; add 4.03g of γ -Methacryloxypropylmethyldimethylsilane ZH-571 with 40.00g octamethylcyclotetrasiloxane D 4 The mixed solution was subjected to ring-opening reaction for 12 hours, cooled to 30° C., and the pH value of the system was adjusted to 7 with ammonia water.

[0016] (2) The temperature of the emulsion prepared in the above (1) step was raised to 80°C, and a mixture of 29.41g of methyl methacrylate, 29.40g of butyl acrylate and 1.20g of α-methacrylic acid and 0.3035g of supernatant was added dropwise within 1.5h. The initiator aqueous solution of ammonium sulfate (APS) and 20.00 g deionized water was kept for 4.5 hours, cooled to room temperature and adjusted to pH 7 with ammonia water, filtered, and discharged to obtain a silicon-acrylic emulsion...

example 2

[0024] In this embodiment, 0.81 g of emulsifier DBSA dodecylbenzenesulfonic acid is added dropwise during the preparation of the silicon-acrylic emulsion, and the others are the same as in Example 1.

example 3

[0026] In this embodiment, 1.60 g of emulsifier DBSA dodecylbenzenesulfonic acid is added dropwise during the preparation of the silicon-acrylic emulsion, and the others are the same as in Example 1.

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Abstract

The invention discloses a silicone-acrylate emulsion with high organosilicon content and a preparation method thereof. According to the invention, a one-kettle-two-step emulsion polymerization method is adopted. The preparation method comprises the following steps: firstly carrying out open loop of a ringlike organosilicon monomer cation by the use of through organosiloxane-containing octamethylcyclotetrasiloxane D4, an organosilane coupling agent containing polymerizable double bonds, an emulsifier and deionized water through acid catalysis to prepare a polysiloxane emulsion containing polymerisable double bonds, and adding an acrylate monomer to carry out silicone-acrylate emulsion radical copolymerization under the action of an initiator so as to prepare the silicone-acrylate emulsion with high silicon content (40%). The reaction is stable, and there is no floating oil or coacervation under the condition of high organosilicon content. Synthesized emulsion particles and a formed film have no obvious phase separation. Within the 400nm-800nm wavelength range of visible light, light transmittance of the emulsion film reaches 91%. According to a waterborne glass paint prepared based on the obtained silicone-acrylate emulsion, the adhesive force of the film on the surface of glass is 1 level, water contact angle can reach 95 degrees, and the film has excellent waterproofness.

Description

technical field [0001] The invention relates to the technical field of emulsion polymerization, in particular to a silicon-acrylic emulsion with high organic silicon content and a preparation method thereof. Background technique [0002] In recent years, the theory and technology of emulsion polymerization have been continuously developed and improved, and people's demand for environmentally friendly chemical products is increasing. Acrylic paint film has good adhesion, acid and alkali resistance, chemical corrosion resistance and other properties. However, the paint film formed by acrylate emulsion is still insufficient in water resistance; the shortcomings of becoming brittle at low temperature and viscous at high temperature also limit the use of acrylate emulsion. In order to solve this problem, the emulsion of various composite structures, such as polyorganosiloxane PDMS modified silicon-acrylic emulsion, is now a research hotspot in high-performance water-based coatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F220/18C08F220/06C08F230/08C08F2/24C08F2/26C08F2/30
Inventor 李效玉马桂玲邱藤郭隆海
Owner BEIJING UNIV OF CHEM TECH
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