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Water-thinned latex paint containing nano calcium carbonate for cuter wall and its prepn process

A nano-calcium carbonate and exterior wall coating technology, applied in the coating and other directions, can solve the problems of affecting the application effect of nano-calcium carbonate, high particle surface energy, material performance decline, etc., to achieve improved thixotropy, high gloss, and solid dry time. short effect

Inactive Publication Date: 2003-02-26
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with ordinary micron-scale calcium carbonate, there are two disadvantages when it is directly applied to organic media: one is that the particle surface energy is high, it is in a thermodynamically unstable state, and it is easy to aggregate into agglomerates, which affects the performance of nano-calcium carbonate. Application effect: the surface of calcium carbonate is hydrophilic and oleophobic, it is difficult to disperse in organic media, and there is no binding force with the base material, which is easy to cause interface defects and lead to material performance degradation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1A

[0025] Example 1A. Preparation of modified polymer emulsion (the amount used is parts by mass):

[0026] Adopt all-acrylate polymerization method: use sodium dodecyl sulfate (SDS) and alkylphenol polyoxyethylene ether (OP-10) as a composite emulsifier, and the amount of sodium dodecyl sulfate (SDS) is 0.25 parts , The amount of alkylphenol polyoxyethylene ether (OP-10) is 0.55 parts, and the two emulsifiers are mixed in 25 parts of deionized water and heated to dissolve. Add the dissolved emulsifier solution into the reactor, stir and raise the temperature. Add 1.8 parts of methyl methacrylate (10% of the total amount) and 2.2 parts of butyl acrylate (10% of the total amount) into the reactor, heat to 75°C and add 13.8 parts of ammonium persulfate dissolved in deionized water 0.02 copies. Wait for the temperature to rise to 80°C and the monomer starts to be initiated. When the system is obviously "bluing", keep the reaction temperature at 80°C, and start adding 16.2 parts of methy...

Embodiment 2A

[0038] Example 2A. Preparation of modified polymer emulsion (the amount used is parts by mass):

[0039] Using styrene-acrylate polymerization method: use 1.2 parts of MS-1 as emulsifier, dissolve 20 parts in deionized water and add it to the reactor after heating to dissolve, stir, heat up, and add 3.68 parts of styrene to the reactor (total amount 20% of butyl acrylate) and 4.32 parts of butyl acrylate (20% of the total amount). The temperature is raised to 72°C, and 20 parts of deionized water are added to dissolve 0.06 part of ammonium persulfate. The monomer starts to be triggered, and the system is obviously "fading" When the "blue" phenomenon occurs, the temperature rises back to 75°C, and the temperature is kept constant. At the same time, 14.72 parts of styrene and 17.28 parts of butyl acrylate each mixed with 0.2 parts of methacrylic acid are added dropwise. At the same time, they are added to the reactor for use. 18.3 parts of ionized water dissolved 0.06 parts of ammon...

Embodiment 3A

[0051] Example 3A. Preparation of modified polymer emulsion (the amount used is parts by mass)

[0052] Adopt styrene-acrylate polymerization method: add 1.2 parts of MS-1 to 20 parts of deionized water, stir and raise the temperature, add 1.8 parts of styrene and 2.2 parts of butyl acrylate, heat up to 72℃ and add deionized water 18.3 parts of dissolved ammonium persulfate 0.06 parts. When the monomer is initiated to the beginning of the system "bluish", the temperature is maintained at about 75°C, and 15.8 parts of styrene and 20.2 parts of butyl acrylate each mixed with 0.2 parts of methacrylic acid are added dropwise. At the same time, 0.06 part of ammonium persulfate dissolved in 20 parts of deionized water was added dropwise, the temperature was raised to 95°C after the dropwise addition, the reaction was continued for 0.5 hours, the temperature was lowered, and the material was discharged after stirring until it was cooled to room temperature. Modified polymer emulsion form...

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PUM

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Abstract

The present invention is a water-thinned latex paint containing nanometer calcium carbonate for outer wall and its preparation process. The paint consists of nanometer calcium carbonate, modified polymer emulsion, other pigment and filler, assistant A, assistant B, assistant C and calcium carbonate slurry. The modified polymer emulsion consists of soft monomer and hard monomer in the mass ratio of 54 / 46 to 56 / 44, the soft monomer is methyl acrylate, ethyl acrylate or capryl acrylate; and the hard monomer is methyl methacrylate or styrene. The nanometer calcium carbonate as the paint solid component can disperse homogeneously in the latex paint without needing surface modification and the paint has raised performance.

Description

Technical field [0001] The invention relates to a water-based latex exterior wall paint and a preparation method thereof, in particular to a water-based latex paint containing nano calcium carbonate, a full acrylate copolymer emulsion or a styrene-acrylate copolymer emulsion and a preparation method thereof. technical background [0002] Traditional architectural coatings are usually divided into two categories: solvent-based coatings and water-based coatings. Because solvent-based coatings contain a large amount of volatile organic solvents that cause pollution to the environment, they are gradually being replaced by environmentally-friendly water-based coatings. Water-based latex paint is a paint composed of synthetic resin aqueous emulsion as the main film-forming substance, pigments, additives, and water. The main function of exterior wall paint is to decorate and protect the exterior wall of the building. As an exterior wall coating, it should have good color retention, and ...

Claims

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Application Information

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IPC IPC(8): C09D5/00C09D7/00C09D133/04
Inventor 李效玉叶露
Owner BEIJING UNIV OF CHEM TECH
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