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Redispersible latex powder and preparation method thereof

A technology for redispersible latex powder and composite emulsion, applied in the field of preparation of redispersible latex powder, can solve the problems of unstable thermodynamic shape of soft core hard shell particles, reduced water resistance of redispersible latex powder, difficulty, etc., and achieve excellent flow The effect of improving adhesion and preventing adhesion

Inactive Publication Date: 2012-12-19
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the addition of protective colloids or surfactants of water-soluble polymers in mode one will greatly reduce the water resistance of the redispersible latex powder obtained; the synthesis of polymer aqueous emulsions with soft-core hard-shell particle structures Among them, polymer monomer units with higher glass transition temperature and better heat resistance are mostly hydrophobic, while polymer monomer units with lower glass transition temperature are mostly hydrophilic, and the hydrophobic components are placed in the polymer / water phase The introduction of hydrophilic components into the interior of the interface will lead to unstable thermodynamic morphology of soft-core hard-shell particles, making it difficult for the synthesized polymer aqueous emulsion to obtain the particle structure of soft-core hard-shell particles according to the expected design.

Method used

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  • Redispersible latex powder and preparation method thereof
  • Redispersible latex powder and preparation method thereof
  • Redispersible latex powder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] 1) Preparation of composite emulsion with inorganic coated polymer core-shell particle structure

[0045] Step 1: Synthesis of Cationic Emulsion

[0046] The cationic unsaturated monomer is (3-methacryloxy)ethyltrimethylammonium chloride, the silane unsaturated monomer is γ-methacryloxypropyltrimethoxysilane, and the basic unsaturated mono The body composition is methyl methacrylate and butyl acrylate, the emulsifier is dodecyltrimethylammonium chloride, the initiator is azobisisobutyronitrile, and its component formula is as follows:

[0047]

[0048]

[0049] First, 0.4 g of azobisisobutyronitrile was dissolved in a mixed unsaturated monomer composed of 21.6 g of methyl methacrylate and 32.4 g of butyl acrylate. Pre-dissolve 0.2 g of dodecyltrimethylammonium chloride in 150 g of water, add it into a reaction kettle equipped with a thermometer, a stirrer, a temperature-controlled heating device and a condensing reflux device, and heat to a constant temperature o...

Embodiment 2

[0058] 1) Preparation of composite emulsion with inorganic coated polymer core-shell particle structure

[0059] Step 1: Synthesis of Cationic Emulsion

[0060] The cationic unsaturated monomer is diallyl dimethyl ammonium chloride, the silane unsaturated monomer is vinyltriethoxysilane, the basic unsaturated monomer is composed of methyl methacrylate, butyl acrylate, emulsifier Be lauryl dimethyl benzyl ammonium chloride, initiator is azobisisobutylamidine hydrochloride, and its component formula is as follows:

[0061]

[0062] First, dissolve 0.4 g of azobisisobutylamidine hydrochloride in 50 g of water, mix 28.8 g of methyl methacrylate, 25.2 g of butyl acrylate, and 1 g of vinyltriethoxysilane to form an unsaturated monomer . Pre-dissolve 0.2 g of dodecyltrimethylammonium chloride in 50 g of water, add it into a reaction kettle equipped with a thermometer, a stirrer, a temperature control heating device and a condensing reflux device, and heat to a constant temperatu...

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Abstract

The invention relates to a preparation method of redispersible latex powder, which comprises the following steps: (1) preparing a cation emulsion; (2) adding an inorganic substance precursor into the cation emulsion for a sol-gel reaction so as to prepare a composite emulsion with an inorganically-coated polymer core shell particle structure; (3) performing spray drying of the composite emulsion to obtain the latex powder. The inorganic coating external layer of particles in the composite emulsion has a high melting point or softening point, can prevent contact and fusion of internal particle polymer cores of the redispersible latex powder during the high temperature spray drying process, and prevent adhesion and caking between the redispersible latex powder, and adherence to the inner wall of the spray drying device. The dried redispersible latex powder has excellent fluidity, redispersibility, and redispersion colloid stability of corresponding aqueous dispersion.

Description

technical field [0001] The invention relates to a method for preparing redispersible latex powder, in particular to a method for preparing redispersible latex powder using a composite emulsion with an inorganic-coated polymer core-shell particle structure. Background technique [0002] Redispersible latex powder, also known as redispersible resin powder, redispersible polymer powder, re-emulsifiable latex powder, etc., refers to the dehydration and pulverization of aqueous emulsion or solution containing polymer components by spray drying and other processes The obtained polymer-based powder can be re-dispersed in water after adding water to form a stable water-phase re-dispersion liquid, and has properties equivalent to the original polymer emulsion or solution. [0003] Redispersible latex powder is mainly used as an additive for concrete, cement mortar and other building materials. It can be used together with cement and other inorganic binders, which can significantly im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08F220/18C08F220/14C08F226/02C08F230/08C08F2/26C08F2/44
Inventor 夏正斌牛林
Owner SOUTH CHINA UNIV OF TECH
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