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Preparation method of styrene-acrylic resin with high solid content

A high solid content, styrene-acrylic resin technology, applied in the application field of branched polymers in polymer synthesis, can solve the problems of insufficient hydroxyl number, incomplete cross-linking and curing, affecting resin performance, etc. The effect of low cost and simple operation

Active Publication Date: 2013-09-25
CHANGZHOU UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In general, the viscosity of the polymer obtained by free radical polymerization is very high, and the viscosity can be reduced by reducing the molecular weight of the polymer. However, blindly reducing the molecular weight will cause insufficient number of hydroxyl groups on each resin molecule, resulting in subsequent crosslinking. The curing is not complete, and the molecular weight is reduced to reduce the glass transition temperature of the resin, which directly affects the performance of the resin and ultimately affects the performance of paints and coatings

Method used

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  • Preparation method of styrene-acrylic resin with high solid content
  • Preparation method of styrene-acrylic resin with high solid content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The monomers styrene (5.2365g, 0.05mol), methyl methacrylate (5.1993g, 0.052mol), n-butyl acrylate (7.4008g, 0.057mol), isooctyl acrylate (3.6563g, 0.020mol), Hydroxypropyl acrylate (9.0095g, 0.069mol), functional monomer dimer (0.4123g), initiator BPO (0.5124g, 2mmol) were mixed evenly, and added dropwise to the solvent xylene (7.6874g ), propylene glycol methyl ether acetate (2.7048g) and heavy aromatics (2.7105g), the system was refluxed for 4 hours, and the mixture was added dropwise. The reaction was continued at constant temperature for 3 hours, and then the reaction was terminated to obtain a colorless and transparent resin. The solid content of the resin was measured to be 70.22%, and the viscosity measured by the Grignard tube was 140.9s. Polymer is analyzed by three-detection gel permeation chromatography, and the results are as follows: light scattering weight average molecular weight M w.MALLS =22260, molecular weight distribution PDI=2.0. figure 1 is the...

Embodiment 2

[0020] The monomers styrene (5.2146g, 0.05mol), methyl methacrylate (5.2017g, 0.052mol), n-butyl acrylate (10.4662g, 0.081mol), hydroxypropyl acrylate (9.0020g, 0.069mol), The functional monomer 3-mercaptopropionyloxyethyl methacrylate (0.2256g, 0.52mmol) and the dimer (0.1864g), the initiator BPO (0.0230g, 0.09mmol) were mixed evenly, and added dropwise to temperature In the solvent xylene (7.6795g), propylene glycol methyl ether acetate (2.6872g) and heavy aromatics (2.6898g) at 135°C, the system was refluxed for 4 hours, and the mixture was added dropwise. The reaction was continued at a constant temperature for 3 hours, and the reaction was terminated to obtain a slightly yellowish transparent resin. The measured resin solid content was 68.51%, and the Grignard tube measured its viscosity as 131.3s. Polymer is analyzed by three-detection gel permeation chromatography, and the results are as follows: light scattering weight average molecular weight M w.MALLS =122300, mole...

Embodiment 3

[0022] The monomers styrene (5.1993 g, 0.05 mol), methyl methacrylate (5.2088 g, 0.052 mol), n-butyl acrylate (9.4562 g, 0.073 mol) and hydroxypropyl acrylate (8.0192 g, 0.062 mol), The functional monomer 3-mercaptopropionyloxyethyl methacrylate (0.6363g, 1.46mmol) and the dimer (0.6782g), the initiator BPO (1.3090g, 0.005mol) were mixed evenly, and added dropwise to temperature In the solvent xylene (7.6843g), propylene glycol methyl ether acetate (2.6903g) and heavy aromatics (2.6924g) at 135°C, the system was refluxed for 4 hours, and the mixture was added dropwise. The reaction was continued at a constant temperature for 3 hours, and the reaction was terminated to obtain a slightly yellowish transparent resin. The solid content of the resin was measured to be 69.32%, and the viscosity measured by the Grignard tube was 64.5s. Polymer is analyzed by three-detection gel permeation chromatography, and the results are as follows: light scattering weight average molecular weigh...

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Abstract

The present invention relates to a preparation method of styrene-acrylic resin with high solid content, which belongs to the field of functional polymer. The preparation method comprises the following steps: mixing comonomer, functional monomer and an initiator evenly and drop-wise adding the mixture into a solution at the temperature of 130 DEG C to 140 DEG C, to obtain styrene-acrylic resin after conventional free radical polymerization reaction for six to eight hours. The method provided by the invention is able to introduce a novel compound containing polymerizable double bond and chain transfer hydrosulphonyl into a reaction system, generating a co-polymer with branched structure in situ. Under the condition of the same molecular weight, the viscosity of the branched co-polymer is lower than that of the linear co-polymer; the mass ratio of the novel compound containing polymerizable double bond and chain transfer hydrosulphonyl to alpha methyl styrene linear dipolymer is adjusted; the styrene-acrylic resin with relatively low viscosity and high solid content can be obtained by adjusting the branching degree and molecular weight of the reaction copolymer.

Description

technical field [0001] The invention relates to a method for preparing styrene-acrylic resin with high solid content, and belongs to the technical field of application of branched polymers in polymer synthesis. Background technique [0002] Styrene-acrylate copolymer (styrene-acrylic resin) has the advantages of good chemical resistance, high hardness and low production cost, and is widely used in the fields of paint and architectural coatings. The current methods for preparing styrene-acrylic resins are mainly divided into two categories: solution polymerization and emulsion polymerization. Whether it is styrene-acrylic resin prepared by solution polymerization or emulsion polymerization, its solid content and viscosity are important indicators, which are directly related to the amount of solvent used, production energy consumption and solvent recovery cost, which means that it directly determines the production cost. effect. However, the styrene-acrylic resin prepared by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F220/14C08F220/18C08F220/28C08F220/38C08F2/38
Inventor 黄文艳蒋其民蒋必彪周炜虎杨宏军薛小强
Owner CHANGZHOU UNIV
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