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Preparing methods of polyisoprene emulsion and rubber thereof

A technology of polyisoprene and isoprene, which is applied in the field of preparation of polyisoprene emulsion and its rubber, can solve problems such as potential safety hazards, removal of organic solvents, cumbersome recycling process, etc.

Active Publication Date: 2008-12-17
SHANGHAI SHENGDA MEDICAL HEALTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the polymerization process requires a large amount of organic solvent as a medium, which not only has environmental pollution problems, hidden safety problems, but also has cumbersome organic solvent removal and recovery processes.

Method used

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  • Preparing methods of polyisoprene emulsion and rubber thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041] After passing nitrogen gas to the bottom of the polymerization tank for 30 minutes, add 100 parts of deionized water, all SBLS, EDTA, MF and NaHCO 3 , stirring and dissolving into an aqueous phase. Add all IP and CHP into the monomer tank, stir and dissolve to form an oil phase. 45 parts of deionized water, all FeSO 4 Add the reducing agent to the kettle, stir and dissolve to form an aqueous solution. Control the kettle temperature at 28°C to 32°C, start adding IP dropwise, and finish dropping in 8 to 10 hours. Add 80% FeSO synchronously 4 Aqueous solution, drop in 8 to 10 hours. When the conversion reaches 60%, add the remaining 20% ​​FeSO 4 aqueous solution. Continue to react for 10-15 hours, when the conversion rate reaches above 85%, add 0.2 part of diethanolamine and 1 part of antioxidant 264. After the reaction is terminated, the polyisoprene latex is sent to a degassing tank, and unreacted monomers are removed by flashing and steaming to obtain a stable wh...

example 2

[0045] The dodecanethiol in Example 1 is adjusted to 0.15 parts, SBLS is 3.5 parts, and MF is 0.5 parts. The material consumption is as shown in Table 1, and other process conditions are unchanged. The obtained emulsion had a solid content of 36.2%, a pH of 7.1, and a particle diameter of 183 nm. The physical and mechanical properties of the obtained rubber blocks are shown in Table 2.

example 3

[0047] After passing nitrogen gas to the bottom of the polymerization tank for 30 minutes, add 100 parts of deionized water, all DRS, EDTA, MF and NaHCO to the reactor according to Table 1 3 , stirring and dissolving into an aqueous phase. Add all IP and CHP into the monomer tank, stir and dissolve to form an oil phase. 50 parts of deionized water, all FeSO 4 Add the reducing agent to the kettle, stir and dissolve to form an aqueous solution. Control the temperature of the kettle at 10°C to 13°C, start adding IP dropwise, and finish the dropwise in 10-15 hours. Add 80% FeSO synchronously 4 Aqueous solution, drop in 10~15 hours. When the conversion reaches 60%, add the remaining 20% ​​FeSO 4 aqueous solution. Continue to react for 15-25 hours, when the conversion rate reaches above 85%, add 0.2 part of diethanolamine and 1 part of antioxidant 264. After the reaction is terminated, the polyisoprene latex is sent to a degassing tank, and unreacted monomers are removed by f...

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Abstract

The invention discloses a preparation method of a polyisoprene rubber latex and a polyisoprene rubber, wherein, the polyisoprene rubber latex is obtained by the emulsion polymerization of isoprene and is then aggregated by breaking emulsion to obtain the polyisoprene rubber. The technological process for preparing latex in the invention is easy to control and the obtained polyisoprene rubber latex has stable quality; the crude rubber has good physical and mechanical properties and can meet the requirements of a plurality of purposes and the diversified demands of the market. The polyisoprene rubber prepared by the invention is mixed and vulcanized with a processing method commonly-adopted by the production of rubber and can be used for manufacturing rubber products, such as various tires, triangular belts, conveyer belts, sealing rings, rubber tubes, rubber shoes and buffering blocks.

Description

technical field [0001] The invention relates to a preparation method of polyisoprene emulsion and rubber thereof. Specifically, isoprene is polymerized by emulsion to obtain polyisoprene emulsion, and then aggregated through demulsification to obtain rubber, which belongs to the fields of polymer chemistry, polymer physics, colloid chemistry, rubber physics and chemistry. Background technique [0002] Isoprene is an important unsaturated conjugated diene. The industrial preparation of isoprene includes the synthesis of enaldehyde, the dehydrogenation of isopentane and isopentene, and the production of C in ethylene refining. 5 Fraction separation, acetylene method and other production methods, where C 5 Fraction separation method developed rapidly. Industrially, isoprene monomer is mainly prepared by solution catalysis or ion polymerization to produce polyisoprene, which is used to replace natural rubber. Polyisoprene can also be prepared into emulsion by emulsion polymer...

Claims

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Application Information

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IPC IPC(8): C08F136/08C08F2/26C08F2/38C08L9/00C08K5/00C08C1/15
Inventor 苏宗球
Owner SHANGHAI SHENGDA MEDICAL HEALTH CO LTD
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