Preparation method of styrene-butadiene latex used for architectural coatings and product thereof

A technology of styrene-butadiene latex and architectural coatings, which is applied in the field of architectural coatings, can solve the problems of easy-migration film water resistance, architectural coating water resistance, poor adhesion, and deterioration, so as to achieve good application prospects and market potential, and improve adhesion Excellent effect with water resistance and comprehensive performance

Inactive Publication Date: 2019-02-01
JINING MING SHENG NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the emulsion film is formed, common emulsifiers are difficult to be compatible with the polymer body, and easily migrate to the surface of the film or the interface connected with the substrate, which makes the water resistance of the film worse, and makes the film and the substrate poor adhesion between materials
For example, Chinese patent application CN103524675 A provides a preparation method of modified styrene-butadiene latex, which produces an anion-nonionic composite emulsifier. The styrene-butadiene latex prepared by this method has high stability, but the styrene-butadiene latex Architectural coatings made of latex have poor water resistance and adhesion

Method used

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  • Preparation method of styrene-butadiene latex used for architectural coatings and product thereof
  • Preparation method of styrene-butadiene latex used for architectural coatings and product thereof
  • Preparation method of styrene-butadiene latex used for architectural coatings and product thereof

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preparation example Construction

[0029] A kind of preparation method for the styrene-butadiene latex of building coating, comprises the following steps:

[0030] S1: Add carboxylic acid monomer, (meth)acrylate monomer, butadiene, (methyl)styrene monomer, silane, titanate, molecular weight modifier, emulsifier, initiator to the pressurized reactor agent and distilled water, stirred and mixed, heated, and carried out free radical emulsion copolymerization;

[0031] S2: After the reaction is completed, cool down;

[0032] S3: adding alkali metal hydroxide to adjust the pH to 6-9, and filtering to obtain the styrene-butadiene latex product;

[0033] Wherein, the mass ratio of each material added is:

[0034]

[0035] In a preferred embodiment, the duration of the radical emulsion copolymerization described in S1 is 3-10 hours, and the reaction temperature is 60-90°C.

[0036] In a further preferred embodiment, the carboxylic acid monomer is selected from any one or a combination of more of the following: ac...

Embodiment 1

[0045]Follow the steps below to prepare styrene-butadiene latex:

[0046] First vacuumize the 2000ml pressurized reaction kettle, the vacuum degree is -0.095MPa, add 0.1g of allyl polyoxyethylene ether ammonium sulfate, 0.1g of potassium persulfate, 50g of distilled water, completely dissolve into an aqueous solution, start stirring, and heat up to 60 ℃; at the same time, dropwise add 1 gram of acrylic acid, 10 gram of butadiene, 100 gram of styrene, 0.2 gram of n-dodecanethiol, 0.2 gram of isopropyl tri(dioctyl pyrophosphate acyloxy)titanium at 60 ℃ Ester, 0.5 grams of γ-methacryloxypropyltrimethoxysilane mixed monomer; and dropwise added 0.4 grams of allyl polyoxyethylene ether ammonium sulfate, 0.4 grams of potassium persulfate, 21.93 grams of distilled water Aqueous solution; the total time of adding drops is 6 hours, fully stirred. After the dropwise addition was completed, the temperature was kept at 60° C. for 4 hours. After completion of the reaction, cool to 25°C, n...

Embodiment 2

[0048] Follow the steps below to prepare styrene-butadiene latex:

[0049] First vacuumize the 2000ml pressurized reactor, the vacuum degree is -0.095MPa, add 2 grams of allyl polyoxyethylene ether ammonium sulfate, 1 gram of sodium persulfate, 500 grams of distilled water, 5 grams of styrene, completely dissolve into an aqueous solution, and open Stir and heat up to 90°C; at the same time, dropwise add 5 grams of methacrylic acid, 50 grams of n-butyl acrylate, 50 grams of methyl methacrylate, 200 grams of butadiene, 95 grams of methyl styrene, 2 gram tert-dodecyl mercaptan, 2 gram isopropyl trioleate acyloxy titanate, 2 gram N-2-(aminoethyl)-3-aminopropyltrimethoxysilane, 3 gram γ-(2 , the mixed monomer of 3-glycidoxy) propyl trimethoxysilane; And dropwise add the mixed aqueous solution of 3 gram allyl polyoxyethylene ethers, 4 gram sodium persulfate, 111 gram distilled water; The total time of dropping is 2 hours, stirring well. After the dropwise addition was completed, t...

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Abstract

The invention provides a preparation method of styrene-butadiene latex used for architectural coatings, and relates to styrene-butadiene latex prepared by the preparation method. The preparation method of the styrene-butadiene latex comprises the following steps: adding carboxylic acid monomers, (methyl) acrylate monomers, butadiene, (methyl) styrene monomers, silane, titanates, a molecular weightregulator, an emulsifier, an initiator and distilled water into a pressurized reactor; carrying out stirring and mixing, carrying out heating, and carrying out free-radical emulsion polymerization reaction; carrying out cooling; and then, adding hydroxides of alkali metals so as to adjust the pH value to 6-9, and carrying out filtration so as to obtain a styrene-butadiene latex product. The preparation method of the styrene-butadiene latex provided by the invention is simple in operations, green and environmentally friendly. The styrene-butadiene latex product provided by the invention is excellent in comprehensive performance, suitable as architectural coatings, and capable of significantly improving adhesion and water resistance of the architectural coatings; and huts, the styrene-butadiene latex has good application prospects and market potential.

Description

technical field [0001] The invention belongs to the technical field of architectural coatings, in particular to a method for preparing styrene-butadiene latex used in architectural coatings, and also relates to the styrene-butadiene latex prepared by the preparation method. Background technique [0002] SBR latex is a copolymer produced by emulsion polymerization of butadiene, styrene plus a small amount of carboxylic acid and other additives. It is usually a milky white aqueous dispersion with blue-purple luster. According to the content of styrene, emulsifier Different from the polymerization temperature, etc., there are many kinds of products, and their properties and uses are also different. [0003] The styrene-butadiene latex with a high proportion of styrene usually has the advantages of high cohesive force and conjunctival strength, good mechanical and chemical stability, good fluidity and storage stability, and large filling capacity. Due to the introduction of pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F236/06C08F220/06C08F220/18C08F220/14C08F212/12C08F212/08C08F2/24C08F2/38C09D109/08
CPCC08F2/24C08F2/38C08F212/08C08F212/12C08F236/06C09D109/08C08F220/06C08F220/18C08F220/1808C08F220/1804C08F220/14
Inventor 施晓旦尹东华
Owner JINING MING SHENG NEW MATERIALS CO LTD
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