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Polysilicic acid modified melamine coagulant for paint fog and preparation method thereof

A paint mist coagulant and melamine technology, which is applied in the field of polysilicate modified melamine paint mist flocculant and its preparation, can solve the problems of cumbersome reaction process, high preparation cost and high price, and achieve wide source of raw materials and stable product performance , the effect of small density

Inactive Publication Date: 2014-07-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic flocculants have many advantages such as less dosage, strong flocculation ability, wide pH range, and good precipitation effect, but the price of this substance is high, and the residual monomers are biologically toxic, and some have "three-induced" effects (teratogenic, carcinogenic, mutagenic), so the use safety of organic flocculants has always been a technical bottleneck, how to develop a safe and efficient new paint mist coagulant is an important issue to be solved urgently
The silicon and aluminum of calcium aluminate powder are dissolved in hydrochloric acid. The reaction process of this process is cumbersome and the preparation cost is high. It is necessary to further improve its cost performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation method of polysilicic acid modified melamine paint mist coagulant, it comprises the steps:

[0039] 1) Preparation of Agent A:

[0040] (1) The molar ratio of the reactants is: melamine: urea: formaldehyde = 1:1:1, raise the temperature to 65°C, adjust the pH to 7, after all the melamine is dissolved, add sulfuric acid to adjust the pH to 2, and continue the reaction for 2 hours to obtain Clear and transparent solution;

[0041] (2) Gradually add dilute sulfuric acid into the sodium silicate solution, adjust the pH value at 1.8, and activate to obtain a polysilicate solution;

[0042] (3) Mix the solution in step (1) with the polysilicate solution prepared in step (2) at a mass ratio of 1:1, and adjust the mixing at a temperature of 40°C The pH value of the solution was 1.8 and aged. The polysilicic acid modified melamine is obtained, namely the A agent.

[0043] 2) Preparation of Agent B: Dissolve 5 parts by weight of urea and 350 parts by w...

Embodiment 2

[0050] The preparation method of polysilicic acid modified melamine paint mist coagulant, it comprises the steps:

[0051] 1) Preparation of agent A:

[0052] (1) The molar ratio of the reactants is: melamine: urea: acetaldehyde = 1:1:2, heat up to 75°C, adjust the pH to 8, after all the melamine is dissolved, add acid to adjust the pH to 3, continue the reaction for 4 hours, and prepare Obtain a clear and transparent solution;

[0053] (2) Gradually add dilute sulfuric acid into the sodium silicate solution, adjust the pH value to 2.0, and activate it to obtain a polysilicate solution;

[0054] (3) Mix the solution in step (1) with the polysilicate solution prepared in step (2) at a mass ratio of 1:1, and adjust the mixing at a temperature of 40°C The pH value of the solution was 2.0 and aged. The polysilicic acid modified melamine is obtained, namely the A agent.

[0055] 2) Preparation of Agent B: Dissolve 15 parts by weight of urea and 450 parts by weight of wa...

Embodiment 3

[0062] A preparation method of polysilicic acid modified melamine paint mist coagulant, it comprises the steps:

[0063] 1) Preparation of Agent A:

[0064] (1) The molar ratio of the reactants is: melamine: urea: polyoxymethylene = 1:1:3, heat up to 80°C, adjust the pH to 9, after all the melamine is dissolved, add acid to adjust the pH to 3, continue the reaction for 5 hours, and prepare Obtain a clear and transparent solution;

[0065] (2) Gradually add dilute sulfuric acid into the sodium silicate solution, adjust the pH value at 2, and activate to obtain a polysilicate solution;

[0066] (3) Mix the solution in step (1) with the polysilicic acid solution prepared in step (2) at a mass ratio of 2:1, and adjust the mixing at a temperature of 45°C The pH value of the solution was 2 and aged. The polysilicic acid modified melamine is obtained, namely the A agent.

[0067] 2) Preparation of Agent B: Dissolve 25 parts by weight of urea and 550 parts by weight of wat...

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PUM

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Abstract

The invention discloses a polysilicic acid modified melamine coagulant for paint fog and a preparation method thereof. The polysilicic acid modified melamine coagulant is characterized by comprising an agent A and an agent B which are separately stored, wherein the mass ratio of the agent A to the agent B is 1: (1-2), the agent A is obtained by using polysilicic acid for modifying a cross-linked polymer generated through condensation reaction of melamine, urea and aldehydes and has a viscosity eliminating effect, and the agent B is a polymer formed through polymerization reaction of urea, nonionic monomers and cationic monomers and has a condensation effect. The coagulant for paint fog is low in cost and high in removal rate of the paint fog.

Description

technical field [0001] The invention relates to a paint mist coagulant, in particular to a polysilicic acid modified melamine paint mist coagulant and a preparation method thereof. Background technique [0002] With the rapid progress of modern chemistry, more and more attention has been paid to the research and development of flocculants. Now the research and development of flocculants shows the direction of polymer and composite multifunctional, and polysilicic acid modification is particularly prominent in this respect. [0003] At present, the main coagulants are divided into two categories: organic and inorganic, and organic flocculants are the main ones. Organic flocculants have many advantages such as less dosage, strong flocculation ability, wide pH range, and good precipitation effect, but the price of this substance is high, and the residual monomers are biologically toxic, and some have "three-induced" effects (teratogenic, carcinogenic, mutagenic), so the use s...

Claims

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Application Information

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IPC IPC(8): C02F1/56C08G12/40C08G12/38C08F220/56C08F226/02C08F220/34C08F222/38
Inventor 曾德芳姜晓博陈沁徐浪陈国玉
Owner WUHAN UNIV OF TECH
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