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Preparation method of calcined diatomite flatting agent

A technology of calcined diatomite and matting agent, applied in chemical instruments and methods, inorganic pigment treatment, dyeing physical treatment, etc., can solve the problems of small bulk density, strong oil absorption of fumed silica, suspension (poor storage stability, etc.)

Active Publication Date: 2010-03-03
BEIJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the relatively strict requirements on the particle size of fumed silica (8-10 μm), its price is very high; in addition, the fumed silica matting agent is easy to float due to its small bulk density (0.06-0.1g / ml), which leads to its high cost in the coating system. Suspension (storage stability) in the coating system is poor. In addition, the fumed silica matting agent has poor suspension (storage stability) in the coating system due to its small bulk density, and the fumed silica has strong oil absorption, which increases Strong thickening effect, which has a certain influence on the coating system

Method used

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  • Preparation method of calcined diatomite flatting agent
  • Preparation method of calcined diatomite flatting agent
  • Preparation method of calcined diatomite flatting agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Add 2wt% NaCl and 6wt% starch (diatomaceous earth is 100%) to diatomite, calcined at 850°C for 2 hours, and naturally cool down to obtain calcined material, which is air-jet crushed and gravity classified , named Y-1. Use styrene-acrylic emulsion paint, do a group of blank experiment, measure the coating glossiness that the incident angle is 20 °, 60 ° and 85 ° are respectively 2.6, 5.7 and 8.9; Sample Y-1 (accounting for 4wt% of coating weight ) (as shown in Table 1) was added in the above-mentioned styrene-acrylic emulsion paint, and the paint was painted according to the normal construction procedure, and the recorded incident angle was 20 °, and the coating gloss of 60 ° and 85 ° was respectively 1.3, 2.8 and 3.1, The glossiness of 60° and 85° is very close, and the extinction rate is 51% and 65% respectively.

Embodiment 2

[0020] Example 2: Add 3wt% NaCl and 7wt% starch (100% diatomaceous earth) to diatomite, calcined at 900°C for 2.5 hours, and naturally lower the temperature to obtain calcined material, which is air-flow pulverized and flotation Graded, designated Y-2. Use styrene-acrylic emulsion paint, do a group of blank experiments, measure that the coating glossiness of 20 °, 60 ° and 85 ° is respectively 2.6, 5.7 and 8.9 at incident angle; Sample Y-2 (accounting for 4wt% of coating weight ) (as shown in Table 1) was added in the above-mentioned styrene-acrylic emulsion paint, and the paint was painted according to the normal construction procedure, and the recorded incident angle was 20 °, and the coating gloss of 60 ° and 85 ° was respectively 1.3, 2.7 and 2.8, When the incident angle is 60° and 85°, the extinction rate is 53% and 68%, respectively.

Embodiment 3

[0021] Example 3: Add 4wt% NaCl and 8wt% starch (100% diatomaceous earth) to diatomite, calcined at 950°C for 3 hours, and naturally lower the temperature to obtain calcined material, which is jet-pulverized and centrifugally classified , named Y-3. Use pure acrylic emulsion paint, do a group of blank experiment, measure that incident angle is 20 °, the coating glossiness of 60 ° and 85 ° is respectively 2.6, 5.7 and 8.9; Sample Y-3 (accounting for 4wt% of coating weight ) (as shown in Table 1) was added in the above-mentioned pure acrylic emulsion paint, and the paint was painted according to the normal construction procedure, and the recorded incident angle was 20 °, and the coating gloss of 60 ° and 85 ° was respectively 1.3, 2.7 and 3.0, When the incident angle is 60° and 85°, the extinction rate is 53% and 66%, respectively.

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Abstract

The invention relates to a preparation method of a calcined diatomite flatting agent, which is applicable to a water paint system of styrene-acrylate emulsion and pure acrylic emulsion and belongs tothe field of paint additive. The method has the steps of taking the diatomite with the weight percentage content of silicon dioxide being more than 85 wt% as the raw material, adding NaCl accounting for 2-4wt% of the diatomite and starch accounting for 6-8wt% of the diatomite, calcining with the temperature of 850-950 DEG C and the time of 2-3h, crushing by using jet milling technology after calcining with the feed particle size being 0.1-1mm and the discharging particle size being 0-40 mum, and obtaining the end product by classification after crushing, wherein the particle sizes after classification are distributed as follows: 1-8 mum: 39-44 wt%; 8-25 mum: 38-42 wt%; and 25-35 mum: 18-20 wt%. The calcined diatomite flatting agent does not increase the paint consistency, and the glossiness of the coating are very approximate at the incident angles of 60 degrees and 85 degrees.

Description

technical field [0001] The invention relates to a coating additive with matting performance; in particular, it relates to a preparation process of a matting agent with diatomite as a main raw material, which is suitable for styrene-acrylic emulsion and pure acrylic emulsion water-based coating systems. Background technique [0002] Gloss is the reflective property of a surface on an object. The surface gloss of an object is closely related to the roughness of the object surface. When light hits the surface of an object, part of it will be absorbed by the object, part will be scattered and reflected, and part will be refracted. The smaller the roughness of the surface of the object, the more light is reflected and the higher the gloss. On the contrary, if the surface of the object is uneven, the more light is scattered, resulting in a decrease in gloss. [0003] Matting agent is an additive added to the coating material formula that can reduce the gloss of the coating film...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/28C09C3/10C09C3/06C09C3/04C09D7/12
Inventor 杜玉成史树丽郭振广刘勇
Owner BEIJING UNIV OF TECH
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