Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of large particle size styrene-butadiene latex

A technology of styrene-butadiene latex and large particle size, which is applied in the field of emulsion polymerization, can solve the problems of easy generation of agglomerates, complicated processes, increased production costs, etc., and achieves excellent mechanical stability and foaming stability, simple production process, and reduced production costs. The effect of reaction time

Active Publication Date: 2017-02-15
潍坊蓝励新材料有限公司
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above scheme adds a kind of polymer latex with agglomeration into the base latex to increase the particle size of the base latex, the synthesis of polymer latex with agglomeration has become a new problem, because of its agglomeration ability and its own The particle size is related to the content of carboxyl groups. If the particle size is large and the content of carboxyl groups is high, the agglomeration ability will be strong, but the production of polymer latex with large particle size and high carboxyl content will be unstable in the polymerization process, and it is easy to produce agglomerates, which makes the production The process is complex and difficult to control, which increases the production cost

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of large particle size styrene-butadiene latex

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0039] The preparation method of this large particle diameter styrene-butadiene latex, this preparation method comprises the following steps: drop into demineralized water, emulsifier, part molecular weight regulator, butadiene, styrene and the electrolyte needed for polymerization after the polymerizer is evacuated, be heated up to After 50-80°C, add the initiator, when the conversion rate reaches 20-40%, add the agglomerating agent, add the chelating agent after 10-30 minutes of agglomeration, and add the remaining molecular weight regulator, the polymerization reaction continues, when When the conversion rate reaches 60-70%, a terminator is added to stop the reaction, and unreacted butadiene and styrene are recovered to obtain large-particle-diameter styrene-butadiene latex with a particle diameter of 250-500nm. The weight components of raw materials in the preparation method are: soft water: 200-300 parts; butadiene: 60-90 parts; styrene: 10-40 parts; emulsifier: 4-6 parts;...

Embodiment 1

[0046] Put into 250 parts of demineralized water after the polymerization kettle is evacuated, 4.8 parts of sodium linoleate, 1 part of OP-10 emulsifying agent, account for the lauryl mercaptan half of the total amount (total amount is 1.5 parts), 75 parts of butadiene, 25 parts of styrene, 0.2 parts of potassium chloride, after heating up to 60°C, add 0.6 parts of initiator potassium persulfate, when the conversion rate reaches 20%, add CaCl 2 0.8 parts, add 1.5 parts of EDTA4Na salt after 20 minutes of agglomeration, and add the remaining half of the molecular weight regulator, the polymerization reaction continues, when the conversion rate reaches 65%, add the terminator sodium dimethyl dithiocarbamate to stop the reaction , recovering unreacted butadiene and styrene, further evaporating and concentrating, cooling and discharging for packaging to obtain the final product. The appearance color of the large particle size styrene-butadiene latex prepared by the above preparati...

Embodiment 2

[0048] Put into 300 parts of demineralized water after the polymerization kettle is evacuated, 4.2 parts of sodium linoleate, 1.2 parts of OP-10 emulsifying agent, account for the lauryl mercaptan half of the total amount (total amount is 1.8 parts), 80 parts of butadiene, 20 parts of styrene, 0.1 part of potassium chloride, after heating up to 68°C, add 0.4 parts of initiator potassium persulfate, when the conversion rate reaches 30%, add CaCl 2 1.2 parts, add 1.8 parts of EDTA4Na salt after 10 minutes of agglomeration, and add the remaining half of the molecular weight regulator, the polymerization reaction continues, when the conversion rate reaches 70%, add the terminator sodium dimethyl dithiocarbamate to stop the reaction , recovering unreacted butadiene and styrene, further evaporating and concentrating, cooling and discharging for packaging to obtain the final product. The appearance color of the large particle size styrene-butadiene latex prepared by the above prepara...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of emulsion polymerization, and especially relates to a preparation method of a large-particle-size styrene-butadiene latex. The preparation method of the large-particle-size styrene-butadiene latex comprises the following steps: vacuum-pumping a polymerization kettle, adding soft water, an emulsifier, parts of a molecular weight adjustment agent, butadiene, styrene and an electrolyte for polymerization to the polymerization kettle, heating to 50-80DEG C, adding an initiator, adding an agglomerant when the conversion rate reaches 20-40%, agglomerating for 10-30min, adding a chelating agent, adding the residual molecular weight adjustment agent, continuously carrying out the polymerization reaction, adding a terminator when the conversion rate reaches 60-70%, stopping the reaction, and recovering unreacted butadiene and styrene to obtain the large-particle-size styrene-butadiene latex with the particle size in a range of 250-500nm. The preparation method has the advantages of easy process control, simple production technology and realization of the industrialized production; and the large-particle-size styrene-butadiene latex has the advantages of excellent mechanical stability and excellent foaming stability.

Description

technical field [0001] The invention belongs to the technical field of emulsion polymerization, and relates to the preparation of polymer materials, in particular to a preparation method of large-diameter styrene-butadiene latex. Background technique [0002] SBR latex with high solid content, because it can maintain a good flow state under high solid content, is used in rubber foaming technology to prepare various high-quality latex sponge products. The solid content in its actual industrial production is generally as high as 65-70%. To maintain fluidity at such a high solid content, the average particle size of the latex particles must reach more than 300nm, and the styrene-butadiene latex produced by general emulsion polymerization, Its particle size is about 60-100nm. When this latex is further concentrated to 50% solid content, it has lost its fluidity and becomes a paste. There are many ways to prepare large particle size styrene-butadiene latex, mainly one-step metho...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08F236/10C08F236/06C08F2/38C08F2/30C08F2/26
Inventor 周兆丰俞红伟谢素华
Owner 潍坊蓝励新材料有限公司