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Modified fine antirust paint with phosphite and preparation thereof

A technology of phosphite and anti-rust pigments, which is applied in the direction of phosphorous acid, phosphorus oxyacids, fibrous fillers, etc., can solve the problems of being easily buried, affecting the dispersion and anti-rust performance of pigments, and complex production processes, etc., to achieve The effect of good antirust performance

Inactive Publication Date: 2006-05-31
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Neutral phosphite is a crystalline hard particle, and it is often crushed with special grinding equipment at the end. The production process is more complicated, and it affects the dispersion of the pigment in the paint and the final rust resistance.
Alkaline phosphite is easy to be buried during the reaction process due to the excess of zinc oxide as a raw material, which affects the improvement of conversion rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] Example 1: Preparation of fine neutral calcium phosphite

[0028] Take 9.58 grams of calcium hydroxide and put it into a three-necked flask, add 100ml of distilled water and start the stirrer to fully stir, add 0.9ml of 10% catalyst D solution, stir fully to form a suspension dispersion, take 10.5ml of 69% phosphorous acid solution and mix with 50ml of distilled water , add the phosphorous acid solution dropwise at room temperature for half an hour. After the dropwise addition, start heating and raise the temperature to 65°C, react for 3 hours, and form a white precipitate of basic zinc phosphite, suction filter, wash three times, and bake at 115°C. 2 hours. The product is crushed to fine white pigment powder, the yield is 86%, and the product is composed of CaHPO 3 ·H 2 O.

example 2

[0029] Example 2: Preparation of fine neutral calcium modified zinc phosphite

[0030] Get 7.91 grams of zinc oxide and 2.39 grams of calcium hydroxide into a three-necked flask, add 100ml of distilled water and start the stirrer to fully stir, add 0.75ml of 10% catalyst D solution, fully stir to form a suspension dispersion, take 69% phosphorous acid solution 10.5 Mix ml with 50ml distilled water, add the phosphorous acid solution dropwise at room temperature for half an hour, start heating after the dropwise addition and raise the temperature to 65°C, react for 3 hours, and form a white precipitate of basic zinc phosphite, suction filter and wash Three times, bake at 115°C for 2 hours. The product is crushed to fine white pigment powder, the yield is 100%, and the product composition is Zn 1.5 Ca 0.5 (HPO 3 ) 2 2H 2 O. The JSM-5600 scanning electron microscope test is a layered stack of fine and thin strips (length ~ 1.5 μm).

example 3

[0031] Example 3: Preparation of fine alkaline zinc phosphite

[0032] Get 14.67 grams of zinc oxide and put it into a three-necked flask, add 100ml of distilled water and start the stirrer to fully stir, add 0.25ml of 10% catalyst D solution, fully stir to form a suspension dispersion, get 3.65ml of 69% phosphorous acid solution and mix with 50ml of distilled water, Add this phosphorous acid solution dropwise at room temperature for half an hour. After the dropwise addition, start heating and raise the temperature to 65°C, react for 3 hours, and form a white precipitate of basic zinc phosphite, suction filter, wash three times, and bake at 115°C for 2 Hour. The product is crushed to obtain a fine white pigment powder (particle size 0.3-0.5 μm), the yield is 98.4%, and the composition is 3ZnO·ZnHPO 3 ·xH 2 O(x=1~2). The JSM-5600 scanning electron microscope test is agglomerates of loose and agglomerated fine particles.

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Abstract

A modified phosphite fine anti-rusting pigment and its production are disclosed. The pigment consists of organic sulfonate with long straight chain as catalyst D 0.1í½1.0wt%, phosphorous acid or its solution, zinc oxide, calcium hydroxide or theirs mixture in proportion=1:1í½1:4 and with mass concentration=10í½20%. It is prepared by catalyst D surface modification or combination with catalyst D surface modification and calcium modification, which fines the pigment. It can be used for industrial production, pigment and plastic industries and is no need for grinding.

Description

technical field [0001] The invention relates to the field of antirust materials, in particular to a modified phosphite fine antirust pigment and a preparation method thereof. Background technique [0002] There are few varieties of non-toxic anti-rust pigments, zinc phosphate is familiar and widely used, but the anti-rust performance of zinc phosphate anti-rust pigments is average. [0003] Phosphite can be oxidized to zinc phosphate by oxygen in the air. It belongs to reducing anti-rust pigments and inhibits local cathodic reaction. Alkaline phosphite has better rust resistance than phosphite, and alkali phosphite paint The resistance to salt water immersion and rust resistance of the film is equivalent to that of red lead. Phosphite is flame retardant to polymer materials and has good thermo-oxidative stability during plastic processing, so phosphite is a new type of non-toxic multifunctional pigment and filler for coatings and plastics. [0004] U.S.Pat.4746393 reported...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/163C09C1/00
Inventor 张学敏姚单单詹翔鹏钟汉珍马定桂
Owner WUHAN UNIV OF TECH
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