Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of emulsion-polymerized styrene butadiene rubber

An emulsion polystyrene butadiene rubber, selected technology, applied in the field of preparation of emulsion polystyrene butadiene rubber, can solve the problems of fast consumption of mercaptan, molecular weight control, wide molecular weight distribution, etc., to achieve stable product performance, good molecular weight adjustment effect, good reproducibility

Inactive Publication Date: 2012-07-18
BEIJING UNIV OF CHEM TECH
View PDF0 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (2) The chain transfer constants of various alkyl mercaptans are quite close to vinyl monomers, therefore, it is difficult to optimize the chain transfer constants of mercaptans as chain transfer agents for vinyl monomers
Since the chain transfer constant of mercaptans to vinyl monomers is usually relatively large, when mercaptans are used in emulsion polymerization systems, there will be a large consumption of mercaptans in the early stage of polymerization, and the molecular weight of the polymer cannot be controlled in the later stage of polymerization, resulting in monomer conversion. When the rate reaches about 60%, the polymerization will be terminated, so that the monomer is not fully utilized
In the industry, the method of adding mercaptan during the polymerization process is often used to prevent the excessive consumption of mercaptan during the polymerization process, which further complicates the production process.
[0007] (3) Because mercaptans are consumed too quickly during the polymerization process, and it is difficult to control the molecular weight in the later stage of polymerization, the emulsion polystyrene butadiene rubber produced in different batches with the same formula has unstable solubility, wide molecular weight distribution, Mooney viscosity and other indicators large deviation

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 emulsion-polymerized styrene butadiene rubber
  • Preparation method of emulsion-polymerized styrene butadiene rubber
  • Preparation method of emulsion-polymerized styrene butadiene rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The first is the preparation of the water phase. First, 190g of water, 4.62g of disproportionated abietic acid soap, 0.231g of phosphoric acid, 0.396g of potassium hydroxide, 0.055g of tetrasodium ethylenediaminetetraacetic acid, and 0.13g of sodium dinaphthyl methane disulfonate are sequentially prepared. g, 0.04g of sodium dithionite, 0.01g of ferrous sulfate, and 0.04g of sodium formaldehyde sulfoxylate were added to the reaction flask and stirred evenly.

[0045] Next is oil phase preparation, the n-butyl-2-phenyl allyl sulfide of styrene 23g monomer dissolving 0.1g ( figure 2 ), and added to the reaction flask after dissolving evenly. Thereafter, 72 g of butadiene was added, the temperature was lowered to 5° C., and emulsification was performed for 20 minutes.

[0046] Finally add oxidizing agent organic solution and comprise 5g styrene, 0.06g hydroperoxide p-menthane, react at 5 ℃ for 9 hours, add terminator solution when conversion rate reaches 68%, wherein con...

Embodiment 2

[0048] The first is the preparation of the water phase. First, 185g of water, 4.65g of disproportionated abietic acid soap, 0.235g of phosphoric acid, 0.4g of potassium hydroxide, 0.05g of tetrasodium ethylenediaminetetraacetic acid, and 0.15g of sodium dinaphthyl methane disulfonate are successively prepared. g, 0.05 g of sodium dithionite, 0.01 g of ferrous sulfate, and 0.03 g of sodium formaldehyde sulfoxylate were added to the reaction flask and stirred evenly.

[0049] Next is oil phase preparation, the n-butyl-2-phenyl allyl sulfide of styrene 24g monomer dissolving 0.15g ( figure 2 ), and added to the reaction flask after dissolving evenly. Thereafter, 72 g of butadiene was added, and the temperature was lowered to 4° C., and emulsification was performed for 20 minutes.

[0050] Add oxidizing agent organic solution at last and comprise 4g styrene, 0.05g hydrogen peroxide p-menthane, react at 5 ℃ for 10 hours, add terminator solution when conversion rate reaches 70%, w...

Embodiment 3

[0052] The first is the preparation of the water phase, which contains 188g of water, 4.7g of disproportionated abietic acid soap, 0.24g of phosphoric acid, 0.4g of potassium hydroxide, 0.05g of tetrasodium ethylenediaminetetraacetic acid, and 0.15g of sodium dinaphthylmethane disulfonate. g, 0.05 g of sodium dithionite, 0.01 g of ferrous sulfate, and 0.03 g of sodium formaldehyde sulfoxylate were added to the reaction flask and stirred evenly.

[0053] Next is oil phase preparation, the n-dodecyl-2-phenyl allyl sulfide of styrene 23g monomer dissolving 0.1g ( figure 2 ), and added to the reaction flask after dissolving evenly. Thereafter, 72 g of butadiene was added, the temperature was lowered to 6° C., and emulsification was performed for 15 minutes.

[0054] Add oxidizing agent organic solution at last and comprise 5g styrene, 0.06g hydroperoxide p-menthane, react at 6 ℃ for 8.5 hours, add terminator solution when conversion rate reaches 65%, wherein contain dithiocarbam...

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

No PUM Login to View More

Abstract

The invention provides a preparation method of emulsion-polymerized styrene butadiene rubber. The preparation method is characterized in that an irreversible addition-fragmentation chain transfer agent with the following general formula is adopted; an aqueous phase is prepared and then an oil phase is prepared; after the irreversible addition-fragmentation chain transfer agent is dissolved in styrene, butadiene is added into a reaction bottle, the temperature is reduced, and a emulsification reaction is conducted for 15 to 30 minutes; finally, an oxidant organic liquor is added into the reaction bottle; after a conversion rate reaches 60 percent to 70 percent, a terminator liquor is added into the reaction bottle and a polymerization termination reaction is conducted for 5 to 10 percents; after the polymerization termination reaction is fulfilled, a demulsification reaction is conducted with solvents of sulfuric acid and a methanol to form gel; and after the gel is milled and dried, the low temperature emulsion-polymerized styrene butadiene rubber is obtained. Compared with data of traditional emulsion-polymerized styrene butadiene rubber using tert-dodecyl mercaptan as a molecular weight regulator, the preparation method has the advantages that the comprehensive performance is not changed, odor produced by using alkyl hydrosulfide is avoided, the monomer conversion rate is increased by 5 to 8 percent, the product performance is steady, and the reproducibility is high.

Description

technical field [0001] The invention relates to a method for preparing emulsion polystyrene butadiene rubber using a molecular weight regulator based on an irreversible addition-breaking chain transfer mechanism. Background technique [0002] Emulsion polymerization technology is the only environment-friendly polymerization technology among polymerization methods. This polymerization technology has the following advantages: (1) the heat of polymerization is easy to diffuse, and the polymerization reaction temperature is easy to control; (2) the viscosity of the polymerization system is very low even in the late stage of the reaction, so it is also suitable for the preparation of high-viscosity polymers; (3) it can Obtain high molecular weight polymerization products; (4) can be used directly in the form of emulsion; (5) can simultaneously achieve high polymerization rate and high molecular weight. Therefore, emulsion polymerization technology has been widely used in importa...

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
IPC IPC(8): C08F236/10C08F2/38C08F2/42C08F2/24
Inventor 石艳安粒惠嘉付志峰
Owner BEIJING UNIV OF CHEM TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com