CN100362029C

CN100362029C - Elastic acrylic ester emulsion

Info

Publication number: CN100362029C
Application number: CNB031088716A
Authority: CN
Inventors: 张瑾璐; 何唯平
Original assignee: Shenzhen Oceanpower Industrial Co Ltd
Current assignee: Shenzhen Oceanpower Industrial Co Ltd
Priority date: 2003-04-01
Filing date: 2003-04-01
Publication date: 2008-01-16
Anticipated expiration: 2023-04-01
Also published as: CN1534050A

Abstract

The present invention relates to a synthesizing method of emulsion for building paint, particularly to a synthesizing formula for elastic acrylic ester emulsion. The elastic acrylic ester emulsion is composed of components of the following proportion by weight: 10 to 15% of deionized water, 15 to 25% of methacrylic ester, 25 to 30% of propenoate, 3 to 5% of methacrylic acid, 3.5 to 5.5% of compounded emulsifying agent, 0.4 to 0.6% of potassium persulfate and 20 to 30% of ammonia water, and the components are copolymerized. Appropriate soft and hard monomers are selected by the formula, crosslinking monomers are added, and an anionic emulsifying agent and a nonionic emulsifying agent are compounded. Thus, the elastic acrylic ester emulsion is guaranteed to have higher elasticity (elasticity elongation can reach 600%), lower vitrification temperature (0 DEG C) and better water resistance, and can be widely used for the preparation processes of building paint.

Description

A kind of elastic acrylate emulsion

Technical field the present invention relates to building coating with the synthetic field of emulsion, especially a kind of elastic acrylate emulsion synthetic.

Background technology is along with science and technology development and building coating performance improves constantly, emulsion is as a kind of requisite component, in the production of many polymkeric substance such as coating, cakingagent, flocculation agent, synthetic rubber, impact-resistant copolymerized thing etc. is synthetic, become a very important part.And, make it in nearly 100 years historical progress based on itself having many good characteristics, become a foundation stone in the chemical industry gradually.And at this wherein, acrylic emulsion is because the monomeric species of its raw material is various, range of product is many and have good integrated application performance, make its this field development rapidly relatively always.

Self-evident, the application of acrylic emulsion in building trade also is more and more important, and along with the continuous enhancing of people's Environmental awareness, water milk type coating has become important developing direction of coatings industry.How to improve the performance of water milk type coating, one of them key factor is exactly the problem of emulsion, and there are defectives such as film-forming temperature is higher, water tolerance is bad in traditional emulsion, and has limited its application in water milk type coating greatly.

Summary of the invention is in order fundamentally to overcome the defective of the water milk type coating aspect of performance that is caused owing to the emulsion factor, the invention discloses a kind of prescription of elastic acrylate emulsion, this formulation selection suitable soft, hard monomer, added cross-linking monomer, used anionic emulsifier and nonionic emulsifying agent is composite, thereby guaranteed that this synthetic emulsion has higher elasticity (elastic extension reaches 600%), lower second-order transition temperature (0 ℃) and water tolerance preferably can be widely used in the preparation process of building coating.

Elastic acrylate emulsion of the present invention is formed by several component copolymerization, and its prescription comprises:

Deionized water 10-15%,

Methacrylic ester 15-25%,

Acrylate 25-30%,

Methacrylic acid 3-5%,

Composite emulsifier 3.5-5.5%,

Potassium Persulphate 0.4-0.6%,

Ammoniacal liquor 20-30%.

As not having specified otherwise, per-cent all is weight percent in this specification sheets.

Wherein: described methacrylic ester is a soft monomer, and this soft monomer also can be methyl methacrylate, Jia Jibingxisuanyizhi.

Acrylate is a hard monomer, and certainly, this hard monomer also can be butyl acrylate, ethyl propenoate.

Methacrylic acid is a cross-linking monomer, and this cross-linking monomer also can be vinylformic acid, acrylamide.

Compound emulsifying agent mainly is that anionic emulsifier and nonionic emulsifying agent are composite, wherein, and nonionic emulsifying agent: anionic emulsifier=1: (1～2).

Potassium Persulphate is an initiator.

In this elastic acrylate emulsion of preparation, at first deionized water and emulsifying agent are added reactor in proportion, heated and stirred, temperature is controlled at 60-70 ℃, after treating that emulsifying agent dissolves fully, add 1/5 mix monomer again and carry out pre-emulsification, the time is controlled at 0.5h, temperature is about 50 ℃, and what finally obtain in the reactor is uniform emulsion; Be warming up to 65-70 ℃ then, initiator solution with 1/4 adds (initiator is mixed with 5% the aqueous solution in advance) wherein, at 80 ± 2 ℃ of following stirring reactions, then in 2.5-3h, be added drop-wise in the reactor residual monomer and initiator solution in batches, feed rate depends on the backflow situation, when to the last a batch of material adds afterreaction soon near end, be warming up to 85-90 ℃, insulation 0.5-1h.Vacuumize at last and remove residual monomer, lower the temperature 40-50 ℃, behind ammoniacal liquor adjusting pH to 7-8, filter discharging.

Compared with prior art, selected starting material in the present invention's prescription, except suitable soft, outside the hard monomer proportioning, also added cross-linking monomer, used anionic emulsifier and nonionic emulsifying agent is composite, thereby guaranteed that this synthetic emulsion has higher elasticity (elastic extension reaches 600%), higher intensity, lower second-order transition temperature (0 ℃) and water tolerance preferably, and stability is also fine, can be widely used in the preparation process of building coating, such as external wall system, the waterproof paint system especially needs emulsion to have in the lower application system of elasticity and second-order transition temperature.

Embodiment

Embodiment:

This elastic acrylate emulsion of preparation 100g, each component concentration of filling a prescription is as follows:

The deionized water of 15g;

The methyl methacrylate of 20g;

The butyl acrylate of 28g;

4.7g compound emulsifying agent, wherein anionic emulsifier is 72IS (Cognis), nonionic emulsifying agent is 3065 (Cognis), nonionic emulsifying agent: anionic emulsifier=1: 1.5;

0.5g Potassium Persulphate (being made into 5% aqueous solution);

4.8g methacrylic acid;

The ammoniacal liquor of 27g.

At first deionized water and emulsifying agent are added reactor, heated and stirred, temperature is controlled at 65 ℃, after waiting for that emulsifiers dissolve fully, the mixture that adds 1/5 hard, soft monomer and cross-linking monomer again carries out pre-emulsification 0.5h, temperature is controlled at about 50 ℃, and what finally obtain in the reactor is uniform emulsion; Be warming up to 70 ℃ then, 1/4 potassium persulfate solution is added (be mixed with in advance 5% the aqueous solution), at 82 ℃ of following stirring reactions, then in 2.5h, be added drop-wise in the reactor residual monomer and potassium persulfate solution in batches, feed rate depends on the backflow situation, when last batch of material adds afterreaction soon near end, be warming up to 90 ℃ of insulation 0.5h, added a small amount of initiator so that reaction is carried out fully, vacuumize at last and remove residual monomer, lower the temperature 40 ℃, regulate pH to 8, filter discharging with ammoniacal liquor.

The gained emulsion property:

Emulsion appearance: the milky white liquid that has blue look fluorescence;

About pH:8;

Viscosity/mPa.s:45;

Gel fraction: 0.9%

Mechanical stability: stable, no precipitate;

Calcium ion stability: by;

Elongation at break: 550%;

Tensile strength: 2.4Mpa;

Film-forming properties: good.

Claims

1. elastic acrylate emulsion, its component concentration is as follows:

Deionized water 10～15%;

Methacrylic ester 15～25%;

Acrylate 25～30%;

Cross-linking monomer 3～5%;

Compound emulsifying agent 3.5～5.5%;

Potassium Persulphate 0.4～0.6%;

Ammoniacal liquor 20～30%;

All per-cents all are weight percents, and above-mentioned each component sum is 100%;

Cross-linking monomer is methacrylic acid, vinylformic acid or acrylamide; To be that anionic emulsifier and nonionic emulsifying agent are composite form nonionic emulsifying agent to compound emulsifying agent: anionic emulsifier=1: (1～2), nonionic emulsifying agent are 3065 of cognis company, and anionic emulsifier is the 72IS of cognis company.

2. elastic acrylate emulsion according to claim 1 is characterized in that: said methacrylic ester is methyl methacrylate or Jia Jibingxisuanyizhi.

3. elastic acrylate emulsion according to claim 1 is characterized in that: said acrylate is butyl acrylate or ethyl propenoate.