CN102199352A

CN102199352A - Preparation method of water-soluble organosilicon emulsion mold release agent

Info

Publication number: CN102199352A
Application number: CN2010101318348A
Authority: CN
Inventors: 林相英; 孙立水; 岳世峰; 丁翔
Original assignee: Rizhao Lanxing Chemical Industry Co Ltd
Current assignee: Rizhao Lanxing Chemical Industry Co Ltd
Priority date: 2010-03-25
Filing date: 2010-03-25
Publication date: 2011-09-28

Abstract

The invention relates to an organosilicon emulsion mold release agent, and especially relates to a method for processing organosilicon into an emulsion used as a mold release agent in the preparation of rubber plastic products and metal cast products. The preparation method of the water-soluble organosilicon emulsion mold release agent comprises the technical steps of: 1. preparing a pre-emulsifying reaction liquid: adding an emulsifier, a stabilizer, and an antifoaming agent into deionized water for preparing an emulsifying reaction liquid system; 2. preparing a copolymerized emulsion: adding dimethyl silicone polymer into the emulsifying reaction liquid system for carrying out a high-speed-shear emulsifying process or a microwave emulsifying process; 3. micro-emulsifying the copolymerized emulsion: processing the copolymerized emulsion through a micro-emulsifying reactor, and adding materials such as a treating compound during the reaction process, such that micro emulsion particles are well-distributed and micronized. The mold release agent prepared with the method of the present invention has advantages of wide application scope, no environment pollution, no harmful organics to human body, low production cost, and no residuals on product surfaces. Compared with inorganic and organic mold release agents produced with prior arts, the release agent provided by the present invention enables moulds to be released more easily.

Description

A kind of preparation method of water-soluble organic silicon emulsion release agents

This paper relates to a kind of preparation method of water-soluble organic silicon emulsion release agents, belongs to the preparation field of fine chemicals.

Technical background

The material that can be used as releasing agent has a variety of, commonly used types such as releasing agent organic/inorganic substance, organism and polymkeric substance.Inorganics class releasing agent is commonly used powders such as Graphite Powder 99, talcum powder, mica powder, molybdenumdisulphide; Organism class releasing agent commonly used has lipid acid, fatty acid soaps, various wax class, ethylene glycol etc., and this class releasing agent has the effect of lubricant concurrently; The polymer class releasing agent mainly contains polyvinyl alcohol, cellulose acetate, organo-fluorine polymer and organosilicon polymer etc., and wherein organosilicon polymer is the releasing agent that optimum is used.The formulation of releasing agent is divided into two types of solid and liquid.Solid form is to use tiny powdered material to use inconvenience and possibility because of powdery substance, and transfer is adhered to and used less in plastic working in surface of plastic products.Therefore now multipurpose liquid releasing agent, but traditional liquid releasing agent mostly is organic substance, inflammable and harm operator's health, easily being attached to product surface simultaneously influences product quality.

Summary of the invention

For overcoming the deficiencies in the prior art, the invention provides a kind of releasing agent of new water-based emulsion attitude, this releasing agent is dispersion agent with water, be easy to spraying, be uniformly dispersed, and the emulsive particle is minimum, does not influence product appearance, this product application scope is wide simultaneously, non-environmental-pollution, the organic substance of no harmful to human, cost of manufacture is cheap, at product surface noresidue material, more traditional inorganic releasing agent and organic release agent are easier to make the goods demoulding.

Technical scheme provided by the invention is: 1, the pre-emulsion reaction liquid of preparation: be prepared into the emulsion reaction liquid system with adding emulsifying agent, stablizer, defoamer etc. in the deionized water; 2, preparation is total to emulsion: add polydimethylsiloxane high speed shear emulsification or microwave emulsification in the emulsion reaction system; 3, will be total to the emulsion microemulsified: will be total to emulsion after the emulsification by the micro emulsion reactor, and in the reaction emulsion process, add treating compound etc., make after the emulsification breast grain evenly with littleization.

Concrete operations technology is as follows: nonionic emulsifier, stablizer polyacrylamide, waterborne organic silicon defoamer are joined in the deionized water according to umber, and stir, form the pre-emulsion of stable homogeneous, because the hydrophile-lipophile balance value HLB of oil phase is about 10.5 in the reaction, therefore, the emulsifying agent of employing is 8-15; In the pre-emulsion reaction solution, add the polydimethylsiloxane of corresponding umber, after low speed stirs evenly, utilize high speed shear emulsifying agent or microwave emulsor to carry out emulsion reaction, make emulsion form stable O/W emulsification system; For the emulsion that makes generation in the product preparation process, do not form the flaw spot that stays emulsion particle on the surface of product, must make the particle of emulsion enough little, therefore this preparation method adopts the mode of microemulsified with emulsion emulsification once more, emulsion particle is dropped to below the micron order, for the range of application that increases releasing agent adds inorganic salts as treating compound, improve wetting property, preservative property and the freeze thawing of releasing agent simultaneously.

Embodiment

Embodiment 1: 5g tween 80,5g polyacrylamide, 3g part weight waterborne organic silicon defoamer are joined in the 150g deionized water, and stir, until the pre-emulsion that forms stable homogeneous, the polydimethylsiloxane that in the pre-emulsion reaction solution, adds 100g, after low speed stirs evenly, utilize the rotating speed high speed shear emulsifying agent 20min of 2000r/min, make emulsion form stable O/W emulsification system; Emulsification system is passed through the microemulsified reactor, and the emulsion particle that adding 2g sodium-chlor makes the reaction generation is prepared into uniform emulsion releasing agent less than 1 micron.

Embodiment 2:2g tween 80 and 3g sorbester p18 blending emulsifiers, 5g polyacrylamide, 3g part weight waterborne organic silicon defoamer join in the 150g deionized water, and stir, until the pre-emulsion that forms stable homogeneous, the polydimethylsiloxane that in the pre-emulsion reaction solution, adds 120g, stir the back and carry out emulsification, make emulsion form stable O/W emulsification system with the microwave emulsor; Emulsification system is passed through the microemulsified reactor, and the emulsion particle that adding 2g calcium chloride makes the reaction generation is prepared into uniform emulsion releasing agent less than 1 micron.

Claims

1. the preparation method of water-soluble organic silicon emulsion release agents comprises following processing step: one, the pre-emulsion reaction liquid of preparation: be prepared into the emulsion reaction liquid system with adding emulsifying agent, stablizer, defoamer etc. in the deionized water; Two, preparation is total to emulsion: add organosilicon reagent high speed shear emulsification or microwave emulsification in the emulsion reaction system; Three, will be total to the emulsion microemulsified: will be total to emulsion after the emulsification by the micro emulsion reactor, and in the reaction emulsion process, add treating compound etc., make after the emulsification breast grain evenly with littleization.

2. require according to right 1 that used emulsifying agent is the nonionic emulsifier such as blending emulsifiers of tween 80 or tween 80 and sorbester p18 in the pre-emulsion reaction liquid of described preparation, its HLB value is 8-15; The polyacrylamide used as stabilizers of molecular weight about 1,000,000, used defoamer are the water-based emulsion defoamer of organosilicon composition;

3. the organosilicon reagent that requires the common emulsion of described preparation to add in being total to emulsion process according to right 1 is a polydimethylsiloxane, and rotating speed is greater than 1200r/min during with high speed shear emulsification; Emulsification times is 15-20min altogether;

4. require described even and littleization of emulsion in order to generate according to right 1, preparation process adopts the reaction of secondary microemulsified; Added treating compound is water miscible inorganic salts in the microemulsified process;

5. require the used mass fraction of described each material according to right 1: emulsifying agent 4-6 part, stablizer 4-6 part, treating compound 1-3 part, defoamer 1-3 part, water 120-150 part, polydimethylsiloxane 80-100 part.