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Preparation method of nuclear shell structure high-silicon silicone acrylic emulsion used for building exterior wall

A core-shell structure, silicone-acrylic emulsion technology, applied in the field of building materials, can solve the problems of failing to meet the characteristic requirements of silicone resin, low content of silicone components, serious tendency of hydrolysis and self-polymerization, etc., and achieves excellent weather resistance, The polymerization system is stable and the effect is conducive to storage stability

Inactive Publication Date: 2013-08-07
TIANJIN URBAN CONSTR COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large difference in polarity between polyacrylate and polysiloxane, during the emulsion polymerization process, the tendency of hydrolysis and self-polymerization of active silanes or siloxanes in the water phase is serious, especially when the content of organic silicon monomers is large. At the same time, this early crosslinking leads to serious gelation of the polymerization system and cannot be carried out, and the two phases of silicone and acrylic are separated, which affects the overall performance of the coating film.
At present, the organic silicon-acrylate emulsion provided by the domestic and foreign markets has a very low content of organic silicon components, generally less than 5% of the polymer mass, which cannot meet the characteristic requirements of silicone resins.

Method used

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  • Preparation method of nuclear shell structure high-silicon silicone acrylic emulsion used for building exterior wall
  • Preparation method of nuclear shell structure high-silicon silicone acrylic emulsion used for building exterior wall
  • Preparation method of nuclear shell structure high-silicon silicone acrylic emulsion used for building exterior wall

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1, preparation unsaturated organosiloxane oligomer emulsion

[0034] First add 10kg sodium dodecylbenzene sulfonate, 6kg OP-10, 80kg deionized water into the reaction kettle, stir for 5 minutes; then add 20kg octavinylcyclotetrasiloxane, 20kg octamethylcyclotetrasiloxane Siloxane, 10kg dodecylbenzenesulfonic acid, stirred for 10 minutes. Afterwards, the temperature was raised to 50-55° C., and the reaction was kept for 3 hours. Then add 5kg of dodecylbenzenesulfonic acid, stir evenly and heat up to 65-70°C, keep warm for 3 hours; finally add 5kg of dodecylbenzenesulfonic acid and cool down to room temperature, stir and react for 25 hours. Obtain unsaturated organosiloxane oligomer emulsion.

[0035] The solid content of the obtained emulsion is 25-35%, the molecular weight is 500-1000, and the storage stability is greater than 2 months.

Embodiment 2

[0036] Embodiment 2, nuclear emulsion synthesis

[0037] Take 3 parts of methyl methacrylate and 2 parts of butyl acrylate by mass, and mix them uniformly to obtain a mixture of acrylate monomers.

[0038]Add 4.5kg of sodium lauryl sulfate, OP-103kg, and 100kg of deionized water into the reactor, and stir evenly; add 40kg of the unsaturated organosiloxane oligomer emulsion prepared in the examples, and the acrylate monomer mixture 15kg, stirred for 30 minutes; then added 1kg of potassium persulfate, 0.67kg of sodium bisulfite, and 0.5kg of sodium bicarbonate, mixed evenly, and then heated up to 65°C. 1kg of alkyl mercaptan, and 35kg of acrylate monomer mixture, 2kg of potassium persulfate and 1.33kg of sodium bisulfite were added dropwise at the same time, and the time for the dropwise addition was 1 hour. Get nuclear emulsion.

Embodiment 3

[0039] Example 3 Core-shell emulsion synthesis

[0040] Get the nuclear emulsion 60kg that embodiment 2 makes, deionized water 50kg, sodium lauryl sulfate 1.2kg, OP-10 0.8kg, the acrylate monomer mixture 40kg that prepares in embodiment 2, vinyl triethoxylate 2 kg of silane and 0.4 kg of potassium persulfate were sequentially added into the reaction kettle, mixed uniformly, heated to 85° C., and reacted at constant temperature for 3 hours. Silicone acrylic core-shell emulsion was obtained.

[0041] The main performance indicators of the obtained silicone acrylic emulsion are as follows:

[0042] Table 1 Silicone acrylic emulsion comprehensive performance index

[0043]

[0044] The core-shell silicon-acrylic emulsion prepared by the present invention realizes organic silicon chemically modified acrylate emulsion through the addition and copolymerization of unsaturated organosiloxane oligomers and acrylates. figure 1 , 2 illustrates this result; image 3 And attached ...

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Abstract

The invention discloses a preparation method of nuclear shell structure high-silicon silicone acrylic emulsion used for building exterior walls. Firstly, the invention uses octavinyl cyclotetrasiloxane, octamethylcyclotetra siloxane, dodecylbenzene sulfonic acid, sodium dodecyl benzene sulfonate, emulsifier 0P-10 and deionized water to prepare unsaturated organo-siloxane low polymer emulsion; theorgano-siloxane low polymer emulsion, acrylate monomer mixture, initiator A, emulsifier, pH value regulator, molecular weight regulator and deionized water are adopted to polymerize nuclear emulsion;and finally, silicon acrylic nuclear emulsion, deionized water, anion / non-ion emulsifier, acrylate monomer mixture, VTES coupling agent and initiator B are adopted to polymerize nuclear emulsion to prepare high-silicon silicone acrylic emulsion. The method of the invention effectively inhibits organosilicon self-polymerization, so that the silicone acrylic emulsion of the invention has high silicon content and stable storage, has the properties of favorable weather resistance, smudge resistance, water resistance and the like, has high gloss and beautiful degree and can satisfy the requirements of high-grade buildings on exterior wall paint.

Description

technical field [0001] The invention relates to a method for preparing an organosilicon-modified acrylate core-shell structure emulsion with high silicon content. It belongs to the field of building materials. Background technique [0002] Polyacrylate emulsions are widely used in the production of architectural paints due to their good film-forming properties, high strength and strong adhesion. However, due to the dense presence of alkyl ester groups in the macromolecular chain of acrylate polymers as side groups, or hinder the free rotation of carbon-carbon bonds, or reduce the density between molecules, it is very sensitive to temperature, showing "cooling Brittle hot stickiness, which limits its application in more high-grade coatings. [0003] Organopolysiloxane has the Si-O-Si bond as the main molecular chain and has the dual functions of inorganic compounds and organic polymers. It also has excellent high and low temperature resistance, high hydrophobicity, good air...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F275/00C08F2/24C09D151/06
Inventor 魏冬青武梦笔张宝莲
Owner TIANJIN URBAN CONSTR COLLEGE
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