Method for preparing latex directly from rare-earth polyisoprene glue solution

A polyisoprene and dilute latex technology, which is applied in the field of direct preparation of latex by using rare earth polyisoprene glue, can solve the problems of destroying emulsion stability and polymer emulsion breaking, and achieves excellent comprehensive performance and process The effect of simple process

Inactive Publication Date: 2014-05-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] (3) Different solvent removal methods: the solvent removal technology disclosed in U.S. Patent US3250737 only uses the method of increasing temperature and reducing pressure. Due to the existence of a large amount of solvent, sudden temperature increase and reduced pressure to remove solvent can easily cause polymer emulsion to break and destroy emulsion stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1, the preparation of polyisoprene glue

[0034] At room temperature, 0.266g Nd(P 507 ) 3 , 0.38g butadiene, 4.44mL Al(i-Bu) 2 After H (1.0mol / L n-hexane solution), react at 50°C for 10 minutes, then add 0.89mL AlEt 2 Cl (1.0mol / L n-hexane solution) was reacted for another 30 minutes.

[0035] Add 40mL of isoprene-cyclohexane solution (monomer concentration: 0.08g / mL) into a 100mL polymerization reactor, then add the rare earth catalyst prepared above, and the Nd / isoprene molar ratio is 1.0×10 -3 , shake to mix evenly, and react at 50° C. for 4 hours to obtain polyisoprene glue.

[0036] The product structure analysis results are as follows: the mass percentage of cis-1,4-polyisoprene is 96.0%, the mass percentage of trans-1,4-polyisoprene is 2.0%, and the content of 3,4-polyisoprene The mass percentage of alkene content is 2.0%; the weight average molecular weight is 6.5×10 4 , the molecular weight distribution is 2.36.

Embodiment 2

[0037] Embodiment 2, the preparation of polyisoprene glue

[0038] At room temperature, 0.143g Nd(P 204 ) 3 , 0.09g isoprene, 3.18mL Al(i-Bu) 3 (1.0mol / L n-hexane solution), react at 30°C for 30 minutes, then add 0.32mL AlEt 2 Cl (1.0mol / L n-hexane solution) was reacted for another 5 hours.

[0039] Add 27mL of isoprene-cyclohexane solution (monomer concentration: 0.12g / mL) into a 100mL polymerization reactor, then add the catalyst prepared above, and the Nd / isoprene molar ratio is 7.0×10 -4 , shake to mix evenly, and react at 30° C. for 4 hours to obtain polyisoprene glue.

[0040] The product structure analysis results are as follows: the mass percentage of cis-1,4-polyisoprene is 95.5%, the mass percentage of trans-1,4-polyisoprene is 2.0%, and the content of 3,4-polyisoprene The mass percentage of alkene content is 1.5%; the weight average molecular weight is 15.1×10 4 , the molecular weight distribution is 2.64.

Embodiment 3

[0041] Embodiment 3, the preparation of polyisoprene glue

[0042] At room temperature, sequentially add 0.134g NdV in a 15mL catalyst reactor 3 , 0.06g butadiene, 4.47mL AlEt 3 (1.0mol / L n-hexane solution), react at 0°C for 30 minutes, then add 0.15mL Al(i-Bu) 2 Cl (1.0mol / L n-hexane solution) was reacted for another 3 hours.

[0043] Add 22mL of isoprene-n-hexane solution (monomer concentration: 0.15g / mL) into a 100mL polymerization reactor, then add the rare earth catalyst prepared above, and the Nd / isoprene molar ratio is 2.0×10 -4 , shake to mix evenly, and react at 70° C. for 2 hours to obtain polyisoprene glue.

[0044] The product structure analysis results are as follows: the mass percentage of cis-1,4-polyisoprene is 96.2%, the mass percentage of trans-1,4-polyisoprene is 2.4%, and the content of 3,4-polyisoprene The mass percentage of alkene content is 1.4%; the weight average molecular weight is 21.5×10 4 , the molecular weight distribution is 2.36.

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Abstract

The invention discloses a method for preparing latex directly from a rare-earth polyisoprene glue solution. The method comprises four steps of preparing a rare-earth polyisoprene glue solution, emulsifying the rare-earth polyisoprene glue solution, removing a solvent of rare-earth polyisoprene latex and concentrating the rare-earth polyisoprene latex. The method implements solution coordination polymerization by taking a rare earth complex as a catalyst, so as to prepare the rare-earth polyisoprene glue solution relatively high in content of cis 1,4-structure. The method disclosed by the invention for preparing the rare-earth polyisoprene latex is simple and concise in technological process; the prepared latex is excellent in comprehensive performance, pure, free from body allergic substances, and is applicable to such fields as medicine and life having higher requirement on safety and comprehensive performance of a finished latex product.

Description

technical field [0001] The invention relates to a method for preparing artificial polyisoprene latex by using coordination polymerization of rare earth solution to prepare polyisoprene glue. Through solution coordination polymerization, the accurate design of the molecular structure, molecular weight and distribution of isoprene rubber can be realized. The rubber is pure and does not contain human allergic substances. Solution coordination polymerization polyisoprene glue is directly emulsified, distilled to remove solvent and centrifuged to concentrate to prepare artificial polyisoprene latex. The process is simple and can replace natural latex. Background technique [0002] Latex products, especially disposable latex products, have been widely used in many fields such as medical and health care, national defense, daily life, electronic detection, etc. Among them, the type and quantity of disposable gloves are the most. PVC, natural latex, and synthetic latex can all be us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/10C08F36/08C08F4/52C08F2/06C08J3/07C08C1/04C08C1/10
Inventor 李杨申凯华侯洋李婷婷郭方
Owner DALIAN UNIV OF TECH
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