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Viscosity reducer for chlorinated natural rubber waterborne paint and preparation method thereof

A technology of chlorinated natural rubber and water-based coatings, applied in rubber derivative coatings, coatings, etc., can solve the problems of uniform dispersion, non-stabilization, phase separation, etc., and achieve the effect of high-efficiency viscosity reduction

Active Publication Date: 2018-09-04
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It should be noted that in the chlorinated natural rubber emulsion described in documents CN106459595A and CN107474637A, chlorinated natural rubber exists in the form of emulsion, and the emulsion is not in a stable state in thermodynamics, that is, adding auxiliary agent to the chlorinated natural rubber emulsion , easy to cause demulsification behavior (that is, the chlorinated natural rubber emulsion particles cannot be uniformly dispersed in water, resulting in phase separation), resulting in the failure of the preparation of chlorinated natural rubber water-based coatings

Method used

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  • Viscosity reducer for chlorinated natural rubber waterborne paint and preparation method thereof
  • Viscosity reducer for chlorinated natural rubber waterborne paint and preparation method thereof
  • Viscosity reducer for chlorinated natural rubber waterborne paint and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] This embodiment is used in the preparation method of the viscosity reducer for chlorinated natural rubber water-based paint, and the specific steps are as follows:

[0029] (1) Take a certain amount of Mg(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 ·9H 2 O soluble in CO removed 2 Of deionized water into solution A, Mg(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 ·9H 2 The ratio of the amount of O and deionized water is 2:1:13;

[0030] (2) Add sodium lignosulfonate to the solution A prepared in step (1), stir at 22°C for 5 min at a stirring speed of 1000 rpm, and then add 1.0 mol / L NaOH solution dropwise to the mixed solution while stirring to adjust The pH of the mixed solution is 8.0, and mixed solution B is obtained, in which the sodium lignosulfonate and Fe(NO 3 ) 3 ·9H 2 The ratio of the amount of the two substances is 3.5:1;

[0031] (3) Blow nitrogen into the mixture B obtained in step (2) for 5 minutes, then place the mixture in a closed container, and react in the closed container at 90°C f...

Embodiment 2

[0033] This embodiment is used in the preparation method of the viscosity reducer for chlorinated natural rubber water-based paint, and the specific steps are as follows:

[0034] (1) Take a certain amount of Mg(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 ·9H 2 O soluble in CO removed 2 Solution A, Mg(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 ·9H 2 The ratio of the amount of O and deionized water is 2.5:1:20;

[0035] (2) Add sodium lignosulfonate to the solution A prepared in step (1), stir at 23°C for 20 minutes at a stirring speed of 2000 rpm, and then add 2.0mol / L NaOH solution dropwise to the mixed solution while stirring to adjust The pH of the mixed solution is 8.5, and mixed solution B is obtained, in which the sodium lignosulfonate and Fe(NO 3 ) 3 ·9H 2 The ratio of the amount of the two substances is 3:1;

[0036] (3) Blow nitrogen gas into the mixture B obtained in step (2) for 8 minutes, then place the mixture in a closed container, and react in the closed container at 95°C for 30 hours, and...

Embodiment 3

[0038] This embodiment is used for the preparation method of the viscosity reducer of chlorinated natural rubber water-based paint, and the specific steps are as follows:

[0039] (1) Take a certain amount of Mg(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 ·9H 2 O soluble in CO removed 2 Solution A, Mg(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 ·9H 2 The ratio of the amount of O and deionized water is 3.5:1:25;

[0040] (2) Add sodium lignosulfonate to the solution A prepared in step (1), stir at 24°C for 40 minutes at a stirring speed of 3000 rpm, and then add 3.0 mol / L NaOH solution dropwise to the mixture while stirring to adjust The pH of the mixed solution is 9.0, and mixed solution B is obtained. The sodium lignosulfonate and Fe(NO 3 ) 3 ·9H 2 The ratio of the amount of the two substances is 3.2:1;

[0041] (3) Blow nitrogen into the mixture B obtained in step (2) for 10 minutes, then place the mixture in a closed container, and react in the closed container at 95°C for 20 hours, and then filter the...

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Abstract

The invention provides a viscosity reducer for chlorinated natural rubber waterborne paint. The viscosity reducer is obtained by taking Mg(NO3)2.6H2O, Fe(NO3)3.9H2O and sodium lignosulfonate as the raw materials, and under pH of 8.0-10.5 and a temperature of 90-110DEG C, carrying out reaction for 6-36h. The viscosity reducer is a lignosulfonate radical-magnesium iron hydrotalcite compound, and thelignosulfonate radical anions in the compound are embedded into the magnesium iron hydrotalcite inorganic laminates. The lignosulfonate radical-magnesium iron hydrotalcite compound can destroy a hydrogen bond network system between chlorinated natural rubber and inorganic filler so as to effectively reduce the viscosity of chlorinated natural rubber waterborne paint, and at the same time does notcause demulsification and phase separation of chlorinated natural rubber waterborne paint.

Description

Technical field: [0001] The invention provides a viscosity reducer for chlorinated natural rubber water-based paint, and at the same time provides a preparation method of the viscosity reducer, belonging to the technical field of viscosity reducers. Background technique: [0002] Due to the outstanding advantages of water-based coatings in environmental protection, in the past ten years, the application of water-based coatings in the field of coatings has been expanding and has replaced many commonly used solvent-based coatings. Water-based coatings are composed of film formers, pigments and fillers and additives. Chlorinated natural rubber is one of the main film-forming agents in the manufacture of anticorrosive coatings. The film-forming material of chlorinated natural rubber has very low permeability to water and oxygen, resistance to general acid and alkali corrosion, high hardness, and good flame retardancy. Features. Because chlorinated natural rubber is insoluble in wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/61C09D7/65C09D115/02
CPCC09D115/02C09D7/61C09D7/65
Inventor 李文卓范容莉罗睿轶刘泽瑜黄帅宇张昱超李仙
Owner NANJING FORESTRY UNIV
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