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Segmented copolymer type dispersing agent and photo-initiation polymerization preparation method thereof

A technology of block copolymer and photo-initiated polymerization, which is applied in the treatment of dyed polymer organic compounds, fibrous fillers, etc., and can solve the problems of difficulty in adapting to grinding and dispersing environments, weak resistance, etc.

Active Publication Date: 2012-10-03
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, general dispersants have relatively weak resistance to the influence of free ions, so it is difficult to adapt to more complex grinding and dispersing environments

Method used

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  • Segmented copolymer type dispersing agent and photo-initiation polymerization preparation method thereof
  • Segmented copolymer type dispersing agent and photo-initiation polymerization preparation method thereof
  • Segmented copolymer type dispersing agent and photo-initiation polymerization preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of low molecular weight narrow distribution poly(acrylic acid-b-vinyl alcohol) sodium salt:

[0029] Add CuCl to the reaction kettle 2 7.2g, add 300.20g of xylene after sufficient nitrogen to expel oxygen, stir and mix, continue to pass nitrogen for 30 minutes, then add 16.74g of 2,2′-bipyridine, raise the temperature to 50°C under the protection of nitrogen and react for 1 hour to obtain a uniform complex solution.

[0030] Raise the temperature to 100°C, turn on the ultraviolet lamp to irradiate the reaction kettle, add dropwise the mixture of tert-butyl acrylate monomer (30g) and benzophenone (4g), the dropwise addition time is 30 minutes, and keep the constant temperature for 30 minutes after the dropwise addition is completed. Then stop the UV light irradiation.

[0031] At the same temperature, add 250.10 g of tert-butyl acrylate monomer, react for 5 hours, add 31 g of vinyl acetate, and react for 3 hours to obtain block copolymer poly(tert-butyl acr...

Embodiment 2

[0034] Preparation of low molecular weight narrow distribution poly(methacrylic acid-b-vinyl alcohol) sodium salt:

[0035] Add CuBr to the reactor 2 16.02g, add 350.20g of xylene after sufficient nitrogen to drive oxygen, stir and mix, continue to pass nitrogen for 30 minutes, then add 22.50g of 2,2′-bipyridine, raise the temperature to 50°C under the protection of nitrogen and react for 1 hour to obtain a uniform complex solution.

[0036] Raise the temperature to 120°C, turn on the UV lamp to irradiate the reactor, add the mixture of vinyl acetate monomer (20.11g) and benzophenone (6.02g) dropwise for 30 minutes, and react at constant temperature for 30 minutes after the addition is completed , and then stop the UV light irradiation.

[0037] At the same temperature, 15.10 g of vinyl acetate monomer was added and reacted at constant temperature for 2 hours. Add 350 g of tert-butyl methacrylate and react at constant temperature for 5 hours to obtain a block copolymer poly...

Embodiment 3

[0040] Preparation of low molecular weight narrow distribution poly(acrylic acid-co-methacrylic acid-b-vinyl alcohol) sodium salt:

[0041] Add CuCl to the reaction kettle 210.02g, add 350.15g of xylene after sufficient nitrogen to drive away oxygen, stir and mix, continue to pass nitrogen for 30 minutes, then add 23.50g of 2,2′-bipyridine, heat up to 50°C under nitrogen protection, and react for 1 hour to obtain a uniform complex solution.

[0042] Raise the temperature to 105°C, turn on the UV lamp to irradiate the reactor, and add tert-butyl acrylate monomer (12g), tert-butyl methacrylate (13.5g) and benzophenone (7.05g) dropwise through nitrogen to drive oxygen The mixture was added dropwise for 30 minutes. After the dropwise addition was completed, the reaction was carried out at a constant temperature for 30 minutes, and then the ultraviolet light irradiation was stopped.

[0043] At the same temperature, tert-butyl acrylate monomer (132 g) and tert-butyl methacrylate ...

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Abstract

The invention discloses a segmented copolymer type dispersing agent and a photo-initiation polymerization preparation method thereof. The preparation method comprises the following steps of: (1) adding 2,2'-bipyridine to a transition metal halide in a solvent to react so as to obtain a coordination compound solution; (2) starting ultraviolet light to carry out irradiation reaction, and dripping vinyl carboxylate or vinyl acetate and a photoinitiator to react, wherein a monomer amount is 5-10% of total monomer amount; (3) adding the rest monomer in the same amount of the step (2), reacting at the temperature the same as that in the step (1), and then adding the other rest monomer to react; (4) filtering with an alumina column for removing transition metal, and then mixing an obtained solution with a sodium hydroxide solution to hydrolyze; and (5) distilling, collecting a distilled product, removing the solvent, and adjusting pH and a weight solid content of a system to obtain a product. The product prepared by using the method is narrow in molecular weight distribution, excellent in dispersibility and strong in salt resistance.

Description

technical field [0001] The invention relates to a block copolymer type dispersant for grinding or dispersing ultrafine calcium carbonate with outstanding salt resistance performance and excellent dispersing effect and a preparation method thereof. Background technique [0002] As a very important inorganic chemical filler, calcium carbonate is widely used in the production, processing and application of papermaking, paint, rubber, plastic, ink, medicine, food, feed, cosmetics, etc. Wet grinding calcium carbonate slurry, the finer the particle size and the higher the solid content, the higher the viscosity during grinding, and the stronger the anti-sticking after grinding. Therefore, it is necessary to add a dispersant when grinding and dispersing calcium carbonate. With the improvement of people's requirements for product quality, the requirements for the fineness and uniformity of calcium carbonate and the solid content of calcium carbonate slurry are also increasing. For ...

Claims

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Application Information

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IPC IPC(8): C08F293/00C08F2/48C09C3/10C09C1/02
Inventor 施晓旦金霞朝
Owner SHANGHAI DONGSHENG NEW MATERIALS
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