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Pre-sulfurization method of fresh natural latex and latex product

A natural rubber latex and pre-vulcanization technology, which is applied in the field of natural rubber processing, can solve the problems of increasing the production cost and price of pre-vulcanized natural rubber latex, and cannot meet the production requirements of extruded products, etc., and achieve the effect of maintaining a stable production process

Active Publication Date: 2019-10-01
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carrying out secondary centrifugation to concentrated natural rubber latex results in the loss of about 20% of rubber substances, which not only increases the production cost of prevulcanized natural latex, but also increases the price of prevulcanized natural latex by about 20% per ton, and further reduces the content of non-rubber substances, which cannot meet Production requirements for extruded products
Concentrated natural rubber latex pre-vulcanization technology is also difficult to popularize and apply

Method used

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  • Pre-sulfurization method of fresh natural latex and latex product
  • Pre-sulfurization method of fresh natural latex and latex product
  • Pre-sulfurization method of fresh natural latex and latex product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Take by weighing 37.5 parts of diallyl monosulfide, add water and be mixed with the emulsified solution that the mass fraction is 20%; Take by weighing 180 parts of the ammonia solution that the mass fraction is 25%; Take by weighing 7.5 parts of potassium hydroxide, be mixed with the mass fraction of 20% potassium hydroxide aqueous solution; weigh 7.5 parts of Pingping plus "O" to prepare a 20% Pingping plus "O" aqueous solution; weigh 60 parts of sulfur, grind and add water to prepare a 50% mass fraction of sulfur suspension ; Take by weighing 40 parts of zinc oxide, grind, add water and be mixed with mass fraction and be 50% zinc oxide suspension; Take by weighing 7.5 parts of phospholipids, be mixed with the aqueous solution that mass fraction is 20%; Weigh 190 parts of mass fraction and be 25% ammonia aqueous solution.

[0045] Weigh 15000 parts of fresh natural rubber latex (equivalent to 4500 parts by dry weight), add diallyl monosulfide emulsified solution and 1...

Embodiment 2

[0049] Take by weighing 75 parts of diallyl disulfide, add water and be mixed with the emulsification solution that the mass fraction is 20%; Take by weighing 180 parts of the ammonia solution that the mass fraction is 25%; Take by weighing 7.5 parts of potassium hydroxide, be mixed with the mass fraction of 20% potassium hydroxide aqueous solution; Weigh 7.5 parts of Pingping plus "O" to prepare a 20% Pingping plus "O" aqueous solution; Weigh 70 parts of sulfur, grind, add water to prepare a 50% mass fraction of sulfur suspension ; Take by weighing 43 parts of zinc oxide, grind, add water and be mixed with mass fraction and be 50% zinc oxide suspension; Take by weighing 7.5 parts of phospholipids, be mixed with the aqueous solution that mass fraction is 20%; Take by weighing 190 parts of mass fraction and be 25% ammonia aqueous solution.

[0050] Weigh 15000 parts of fresh natural rubber latex (equivalent to 4500 parts by dry weight), add diallyl disulfide emulsified solution...

Embodiment 3

[0054] Take by weighing 112.5 parts of diallyl disulfide, add water and be mixed with the emulsification solution that mass fraction is 20%; Take by weighing 180 parts of ammonia solution that the mass fraction is 25%; Take by weighing 7.5 parts of potassium hydroxide, be mixed with the mass fraction of 20% potassium hydroxide aqueous solution; Weigh 7.5 parts of Pingping plus "O" to prepare a 20% Pingping plus "O" aqueous solution; Weigh 80 parts of sulfur, grind, add water to prepare a 50% mass fraction of sulfur suspension ; Take by weighing 50 parts of zinc oxide, grind, add water and be mixed with mass fraction and be 50% zinc oxide suspension; Take by weighing 7.5 parts of phospholipids, be mixed with the aqueous solution that mass fraction is 20%; Take by weighing 190 parts of mass fraction and be 25% ammonia aqueous solution.

[0055] Weigh 15000 parts of fresh natural rubber latex (equivalent to 4500 parts by dry weight), add diallyl disulfide emulsified solution and ...

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Abstract

The invention provides a pre-sulfurization method of fresh natural latex and a latex product. The pre-sulfurization method of the fresh natural latex comprises the following steps that a sulfurizationcompounding agent is added to the fresh natural latex for pre-sulfurization, and the pre-sulfurized fresh natural latex is obtained; the pre-sulfurized fresh natural latex is centrifuged and concentrated to obtain the concentrated pre-sulfurized natural latex; the sulfurization compounding agent comprises sulfur, zinc oxide and an accelerant, and the accelerant is diallyl sulfide. The latex product is prepared from the concentrated pre-sulfurized natural latex. According to the pre-sulfurization method of the fresh natural latex, the latex is pre-sulfurized, centrifuged and concentrated, andthe production cost cannot be increased; through centrifugation and concentration, the residual sulfurization compounding agent is removed, and the problem can be thoroughly solved that the surface ofthe latex product is sprayed with frost; the content of non-rubber substances in the natural latex is basically identical to that of an existing technology, the sulfurization degree basically keeps invariant, and the fresh natural latex can be stored for a long time, which is beneficial to production and management of downstream firms.

Description

technical field [0001] The invention relates to the field of natural rubber processing, in particular to a method for pre-vulcanizing fresh natural latex and latex products. Background technique [0002] Natural rubber latex (NRL) has good film-forming properties and excellent comprehensive properties, and is widely used in the production of latex products such as condoms, gloves, balloons, catheters, latex, rubber filaments, sponges, and adhesives. Among them, latex products such as condoms, gloves, balloons, rubber hoses and rubber threads are produced using pre-vulcanized natural latex through dipping and extrusion processes, and the natural latex consumed is about 80% of the total natural latex in the world. The pre-vulcanization of natural rubber latex refers to the cross-linking of the rubber hydrocarbon molecular chains in the natural latex particles by the vulcanization compounding agent under certain reaction conditions to form a three-dimensional network structure....

Claims

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Application Information

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IPC IPC(8): C08J3/24C08L7/02C08K3/06C08K3/22C08K5/372C08K5/521C08C1/10
CPCC08C1/10C08J3/24C08J2307/02C08K3/06C08K5/372C08K5/521C08K2003/2296C08K2201/014
Inventor 王启方刘宏超潘琪余和平
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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