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Branched polyacrylic acid dispersant, and preparation method and application thereof

A branched polypropylene and dispersant technology, applied in chemical instruments and methods, transportation and packaging, textiles and papermaking, etc., can solve the problem of reducing the viscosity of the grinding slurry, reducing the agglomeration of calcium carbonate particles, and the unsatisfactory stabilization of the dispersant and other problems, to achieve the effect of stable reaction, less heat release and low reaction temperature

Active Publication Date: 2012-11-14
SHAOXING SIHUIER NEW MATERIALS CO LTD
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Problems solved by technology

[0003] In order to solve the problem that the stabilizing effect of the dispersant in the prior art is not ideal enough, one of the purposes of the present invention is to provide a branched polyacrylic acid dispersant for coating calcium carbonate grinding, its unique molecular chain structure makes it The new cross-section produced by grinding can be better coated, so that the grinding and dispersion can be carried out smoothly and efficiently. At the same time, the electrostatic repulsion of the electric double layer of the dispersant of the present invention can reduce the agglomeration between calcium carbonate particles and reduce the abrasiveness of the grinding slurry. viscosity

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  • Branched polyacrylic acid dispersant, and preparation method and application thereof
  • Branched polyacrylic acid dispersant, and preparation method and application thereof
  • Branched polyacrylic acid dispersant, and preparation method and application thereof

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Embodiment Construction

[0022] The method and advantages of the present invention will be further described in comparison with specific examples and comparative examples below.

[0023] The preparation of novel branched polyacrylic acid dispersant is carried out as follows:

[0024] (1) Add a certain amount of water and the reductant of the initiation system into the reactor as the bottom material, stir and dissolve;

[0025] (2) Make a solution of acrylic acid monomer, comonomer, polyene monomer, and a certain amount of water, and neutralize it with an alkaline substance to a pH of about 4, and then add the remaining reducing agent of the initiating system to make a dropwise addition Liquid A;

[0026] (3) The oxidizing agent of initiating system, a certain amount of water are made into dripping liquid B;

[0027] (4) Add solutions A and B to the reactor described in step (1) at a certain temperature by means of dropwise addition within a certain period of time, then react for a period of time to ...

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Abstract

The invention discloses a branched polyacrylic acid dispersant, and a preparation method and application thereof. According to the invention, polyene monomers are introduced into molecular chains of a linear sodium polyacrylate dispersant so as to obtain a branched dispersant structure which allows the branched polyacrylic acid dispersant to better clad cross sections newly occurred after grinding, and therefore, grinding and dispersing efficiency is improved; furthermore, methacrylic acid, maleic anhydride, fumaric acid, itaconic acid, sodium methylacrylsulfonate, 2-acrylamide-2-methylpropanesulfonic acid (AMPS) and the like are introduced and can provide monomers with stronger negative charges, improve electrostatic repulsion action of double electric layers, mitigate agglomeration among calcium carbonate particles and reduce the viscosity of ground slurry. The dispersant provided by the invention enables high efficiency in grinding of calcium carbonate to be obtained and the slurry to have the characteristics of low viscosity, good dispersibility and stability.

Description

technical field [0001] The invention relates to a synthetic polymer calcium carbonate wet grinding dispersant, in particular to a branched polyacrylic acid dispersant for coating calcium carbonate grinding and its preparation method and application. technical background [0002] Ground calcium carbonate (GCC) is a widely used non-metallic mineral powder with high whiteness, good hiding power and excellent fluidity. It is the main source of coatings for papermaking. Coatings for papermaking require high concentration and low viscosity, so it is very important to disperse ground calcium carbonate to a high concentration. Ground calcium carbonate used in papermaking coatings is a kind of fine particles obtained by wet grinding calcium carbonate. The fineness level of the particles varies with different uses. For example, the GCC of the primer of the paint can be slightly coarse, and the GCC of the top coat must be fine. The fineness reaches above 95% (<2μm). The surface mo...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F222/06C08F222/02C08F228/02C08F220/58C08F4/40C08F222/14C08F290/06C08F212/36C08F222/20B01F17/52C09C1/02C09C3/04C09C3/10D21H19/58C09K23/52
Inventor 雷得定孙睢州郝丙业
Owner SHAOXING SIHUIER NEW MATERIALS CO LTD
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