A kind of comb structure polymer and its preparation method and use

A structural polymer, comb-shaped technology, applied in the direction of pigment slurry, etc., can solve the problems of difficult to achieve industrialization, harsh reaction conditions, high energy consumption, improve dispersion efficiency and stability, avoid polymer decomposition, and facilitate industrialization. Effect

Active Publication Date: 2022-08-02
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above three copolymer dispersants have good dispersion effects, they all need to be prepared by living polymerization, the reaction conditions are harsh, and the production efficiency is low.
In addition, the patent US6406143 discloses a comb-shaped dispersant of polyether graft modified styrene-maleic anhydride copolymer, but the dispersant has the disadvantage of not being able to sufficiently stabilize organic pigments in solvent-containing formulations
[0006] Although the above-mentioned dispersants with specially designed structures such as blocks and combs prepared by living polymerization are widely used, due to the harsh production conditions of the living polymerization method, it is difficult to realize industrialization. At present, only a few companies can produce such products
However, when using the common free radical polymerization method to prepare comb-shaped polymers, it is necessary to use monomers with large side chains for free radical polymerization. Due to the low conversion rate of monomers containing large side chains, they cannot be prepared even at high temperatures. Polymers with sufficient solvation chains and controllable position of solvation chains
Moreover, ordinary free radical polymerization cannot effectively regulate the molecular weight of the polymer, resulting in a wider molecular weight distribution of the polymer.
In addition, living polymerization and ordinary free radical polymerization usually need to use high-temperature flash evaporation to remove organic solvents, which consumes a lot of energy and easily leads to the decomposition of polymers at high temperatures, resulting in poor product performance

Method used

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  • A kind of comb structure polymer and its preparation method and use
  • A kind of comb structure polymer and its preparation method and use
  • A kind of comb structure polymer and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] (1) In a 1L round-bottom four-necked flask with a stirrer, a condenser and a feeding port, add 235 g of propylene glycol methyl ether, stir and dissolve, and heat to 80°C. A mixture of 57 g of acrylic acid, 90 g of styrene, 23 g of glycidyl methacrylate and 2.4 g of n-dodecyl mercaptan was prepared, and an initiator mixture of 6 g of azobisisobutyronitrile and 15 g of propylene glycol methyl ether was prepared. The two mixtures were simultaneously added dropwise to the reactor at 80°C to start the polymerization reaction. The dropwise addition time was 4 hours. After the dropwise addition, the reaction was continued for 1 hour, resulting in a prepolymer containing epoxy groups in the side chain. The weight average molecular weight is 5433.

[0065] (2) adding the mixed solution of 240g polyetheramine (Jeffamine M2070), 40g hydrogenated castor oil, 0.5g triethylamine and 140g cyclohexane solvent to the reaction system of step (1) at one time after the insulation, at 80° ...

Embodiment 2

[0070] (1) In a 1L round-bottom four-necked flask with a stirrer, a condenser and a feeding port, add 230 g of propylene glycol methyl ether, stir and dissolve, and heat to 90°C. A mixture of 45 g of methacrylic acid, 90 g of butyl methacrylate, 70 g of glycidyl methacrylate and 9 g of tert-dodecyl mercaptan was prepared, and an initiator mixture of 10.8 g of dibenzoyl peroxide and 15 g of propylene glycol methyl ether was prepared. The two mixtures were simultaneously added dropwise to the reactor at 90 °C to start the polymerization reaction. The dropwise addition time was 3 hours. After the dropwise addition, the reaction was continued for 1 hour to generate a prepolymer containing epoxy groups in the side chain. The weight average molecular weight is 1768.

[0071] (2) the mixed solution of 189g polyetheramine (Genamin M 31), 18g hydrogenated castor oil, 0.9g triethylamine and 180g methylcyclopentane solvent was added at one time in the reaction system of step (1) after th...

Embodiment 3

[0076] (1) In a 1L round-bottom four-necked flask with a stirrer, a condenser and a feeding port, add 130 g of propylene glycol butyl ether, stir and dissolve, and heat to 70°C. 24g maleic acid, 48g alpha-methylstyrene, 36g allyl glycidyl ether and 4.8g alpha-methylstyrene linear dimer mixture, 4.8g azobisisoheptonitrile and 15g propylene glycol butyl ether agent mixture. The two mixtures were simultaneously added dropwise to the reactor at 70°C to start the polymerization reaction. The dropwise addition time was 5 hours. After the dropwise addition, the reaction was continued for 1 hour to generate a prepolymer containing epoxy groups in the side chain. The weight average molecular weight is 2674.

[0077] (2) add the mixed solution of 276g polyetheramine (Jeffamine M1000), 21.6g hydrogenated castor oil, 1.2g triethanolamine and 250g methylcyclopentane solvent to the reaction system of step (1) at one time after the insulation is completed, at 70 The graft modification reac...

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Abstract

The invention provides a comb-structure polymer, a preparation method and application thereof. The method comprises the steps of first introducing an epoxy group into the polymer by means of free radical polymerization, and then separately combining the epoxy group with an amine group through the epoxy group. Monomers and hydroxyl-containing monomers are ring-opened to prepare comb-shaped polymer dispersants. The preparation method regulates the molecular weight of the polymer by changing the solubility of the solvent in the reaction system to the polymer. When the molecular weight of the polymer increases to a certain level and cannot be dissolved, it will be precipitated from the solvent, so that the molecular weight of the prepared polymer is easy to control and the molecular weight distribution is better. narrow. The dispersant prepared by the method has high dispersing efficiency for pigments and fillers, and has excellent slurry stability, can disperse inorganic and organic pigments and fillers, and has a wide range of applications.

Description

technical field [0001] The invention relates to the technical field of synthesis and application of polymers, and mainly relates to a comb-shaped structure polymer, a preparation method thereof, and use in a pigment dispersant. Background technique [0002] Coatings and inks are widely used as protective coatings for materials such as metals, composites, plastics, concrete, ceramics, paper, etc., and provide color by the addition of particulate solids such as pigments and fillers, which may be organic or inorganic. Dispersing agent is an auxiliary agent used to disperse pigments and fillers. It is adsorbed on the surface of pigments and fillers through anchoring groups, and stabilizes the particles through electrostatic repulsion and / or steric hindrance, so that the pigments and fillers are evenly distributed. in the system. [0003] With the increasingly stringent environmental protection requirements, the demand for aqueous dispersant products is increasing. At present,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/02C09D17/00
CPCC08G81/025C09D17/008C09D17/003C09D17/005
Inventor 张抒宋微秦佃斌纪学顺孙家宽
Owner WANHUA CHEM GRP CO LTD
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