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Preparation method for special precipitated calcium carbonate for PVC (polyvinyl chloride) stone chip resistant coating

A technology for precipitating calcium carbonate and coatings, applied in the direction of calcium carbonate / strontium / barium, coatings, etc., can solve problems such as unfavorable moisture control, difficulty in meeting the needs of filling high-grade PVC anti-stone chip coatings, and products are easy to absorb moisture, etc. Inhibition of solvation, simple and feasible method, low hygroscopic effect

Active Publication Date: 2015-03-11
GUANGXI HUANA NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the calcium carbonate product prepared by this method has good thixotropy, it can be widely used in high-grade coatings, sealants and other industries, but the introduction of coupling agent will cause the product to absorb moisture very easily, which is not conducive to moisture control.
[0015] In summary, the precipitated calcium carbonate or nano-calcium carbonate prepared by the existing technology is difficult to meet the needs of filling high-grade PVC anti-stone chip coatings

Method used

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  • Preparation method for special precipitated calcium carbonate for PVC (polyvinyl chloride) stone chip resistant coating
  • Preparation method for special precipitated calcium carbonate for PVC (polyvinyl chloride) stone chip resistant coating
  • Preparation method for special precipitated calcium carbonate for PVC (polyvinyl chloride) stone chip resistant coating

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Dilute the milk of lime that has been refined and aged for 48 hours, adjust the specific gravity to 1.060, control the temperature at 20.0°C, and then transport it to the bubbling carbonization tower, and pass it into the purified and cooled kiln gas for carbonation reaction. The kiln gas flow rate is 9m 3 / h, the volume content of carbon dioxide is 33%, when the pH of the reaction solution drops below 7.0, the carbonation reaction is completed, and the specific surface area of ​​cooked pulp is 24.8m 2 / g;

[0039] Prepare a compound surface treatment agent of 3.50% (calculated on a dry basis of calcium carbonate): among them, the fatty acid is selected from stearic acid: arachidic acid = 1:1, and its consumption is 60% of the total surface treatment agent, and the consumption of castor oil is the surface treatment 10% of the total amount of agent, the amount of epoxy soybean oil is 30% of the total amount of surface treatment agent, the temperature of hot water is 90 ...

Embodiment 2

[0043] Dilute the milk of lime that has been refined and aged for 48 hours, adjust the specific gravity to 1.070, control the temperature at 25°C, and then transport it to the bubbling carbonization tower with stirring; pass it into the purified and cooled kiln gas for carbonation reaction, The kiln gas flow rate is 10m 3 / h, the volume content of carbon dioxide is 33%, when the pH of the reaction solution drops below 7.0, the carbonation reaction is completed, and the specific surface area of ​​cooked pulp is 21.3m 2 / g;

[0044]Prepare the compound surface treatment agent of 3.0% (calcium carbonate dry basis): wherein fatty acid selects stearic acid for use: behenic acid=1:3, and its consumption is 80% of surface treatment agent total amount, castor oil consumption is surface 12% of the total amount of treatment agent, the amount of epoxidized soybean oil is 8% of the total amount of surface treatment agent, the temperature of hot water is 90 ℃, and the consumption of sodiu...

Embodiment 3

[0048] Dilute the milk of lime that has been refined and aged for 48 hours, adjust the specific gravity to 1.055, control the temperature at 20°C, and then transport it to the bubbling carbonization tower with stirring; pass it into the purified and cooled kiln gas for carbonation reaction, The kiln gas flow rate is 10m 3 / h, the volume content of carbon dioxide is 35%, when the pH of the reaction solution drops below 7.0, the carbonation reaction is completed, and the specific surface area of ​​cooked pulp is 31.7m 2 / g;

[0049] Prepare the composite surface treatment agent of 4.5% (in calcium carbonate dry basis): wherein fatty acid is selected stearic acid for use, and its consumption is 70% of surface treatment agent total amount, castor oil consumption is 20% of surface treatment agent total amount, The consumption of epoxy soybean oil is 10% of the total amount of surface treatment agent, the temperature of hot water is 95°C, and the consumption of sodium hydroxide is ...

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Abstract

The invention discloses a preparation method for special precipitated calcium carbonate for a PVC (polyvinyl chloride) stone chip resistant coating. The preparation method comprises the technical operation as follows: adjusting the ratio of lime milk to be 1.040-1.080, feeding kiln gas with the flow of 6-10m<3> / h, controlling the specific surface area of matured slurry to be 16-40m<2> / g when the pH value of reaction liquid is reduced to be below 7.0, and adding a composite surface treatment agent at the temperature of 50-90 DEG C for wrapping, wherein the total adding amount of the surface treatment agent is 1.5-5.0 percent of dry calcium carbonate base; performing pressure filtration dewatering, drying, smashing and packaging on the slurry to obtain a precipitated calcium carbonate product for the PVC stone chip resistant coating. The precipitated calcium carbonate prepared by the preparation method disclosed by the invention is lower in hygroscopicity, so that the thixotropy, yield value and viscosity of filling of PVC plastipaste are effectively controlled, and the rheology stability of the PVC plastipaste is improved. The method disclosed by the invention is simple, feasible and low in production cost, and has higher economical and social benefits.

Description

field of invention [0001] The invention relates to a preparation technology of active precipitated calcium carbonate, in particular to a preparation method of precipitated calcium carbonate special for PVC anti-stone chip coating. Background technique [0002] PVC anti-stone chip primer is a one-component paste made of polyethylene paste resin and blended resin as the base resin, with plasticizers, tackifiers, active fillers, etc., sprayed On the body floor (frame), wheel cover and other parts, it is baked and cured at a temperature of about 150°C to form an elastic coating. [0003] Precipitated calcium carbonate is an important component of PVC plastisol formula, adding it to the PVC paste of automobile primer can not only increase its wear resistance and stone chip resistance, but also facilitate the adjustment of rheological properties, so that it has a certain Excellent thixotropy, which meets the needs of spraying and other processing processes, that is, low viscosity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D127/06C09D7/12C01F11/18
CPCC01F11/18C08K3/22C08K3/26C08K5/12C08K2003/2206C08K2003/265C09D127/06
Inventor 颜干才朱勇林进超谌业文周金炼
Owner GUANGXI HUANA NEW MATERIALS TECH CO LTD
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