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Prevulcanization method and application of deproteinized natural latex

A natural rubber latex and deproteinization technology, applied in the field of deproteinized natural rubber latex processing, can solve the problems of unstable dispersion state of rubber particles, uneven distribution of solution, excessive vulcanization speed, etc., and achieve the effect that is beneficial to production management

Active Publication Date: 2020-06-26
田晓慧
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a pre-vulcanization method of deproteinized natural rubber latex to improve its film-forming uniformity and physical strength, and at the same time solve the problem that the initial vulcanization temperature of deproteinized rubber particles is too high and the subsequent vulcanization speed is too fast problems, as well as the poor stability of the deproteinized latex during processing and pre-vulcanization, resulting in unstable dispersion of colloidal particles (coagulation by mechanical action) or excessive stability (intervention of a large number of surfactants), so that the obtained latex does not appear on the surface of the dipping model. The problem of uneven distribution of solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] 1. Preparation of waxy corn starch nanoparticles:

[0024] Add 178.1mL of 95% concentrated sulfuric acid to 821.9mL of water to prepare 250mL of sulfuric acid with a concentration of 3.16mol / L, put it in a flask, add 36.7g of waxy corn starch to the prepared 250mL of sulfuric acid, and heat it at 40±2℃ Stirred under the same conditions for 5 days. Centrifuge and wash with water repeatedly until neutral, add chloroform, and freeze-dry at 4°C. Waxy corn starch nanoparticles were prepared. Wherein the waxy corn starch can be replaced by plant starches such as glutinous rice starch, rice starch, wheat starch, and tapioca starch.

[0025] 2. Preparation of nano-chitin:

[0026] Remove most of the acetyl groups from the chitin raw material under the action of 80-90°C and 6wt% sodium hydroxide or potassium hydroxide, so that the acetyl group removal rate can reach more than 90% of the purified chitin, take the purified chitin 25 grams, dissolved in 690 mL of hydrochloric a...

Embodiment 1

[0033] Take by weighing 10 parts of diallyl sulfide emulsion with a mass fraction of 10%, take by weighing 15 parts of a 10% potassium hydroxide aqueous solution; take by weighing 39 parts of a 1% carbomer aqueous solution; weigh 90 5 parts of sulfur, 4.5 parts of cyclodextrin, 14 parts of 1% carbomer solution and deionized water were mixed and ground for 8 hours to make a mass fraction of 50% sulfur suspension; weigh 51 parts of zinc oxide, 3 parts of cyclodextrin , 11 parts of 1% carbomer solution and deionized water were mixed and ground for 8 hours to make a zinc oxide suspension with a mass fraction of 50%; 90 parts of antioxidant Wingstay L, 4.5 parts of cyclodextrin, 14 parts of 1% carbomer Boehm solution and deionized water were mixed and ground for 8 hours to make 50% anti-aging agent Wingstay L suspension; weigh 2 parts of waxy corn starch nanoparticles, and prepare waxy corn starch nanoparticles with a mass fraction of 1%. 200 parts of particle suspension. Weigh 15...

Embodiment 2

[0036]Weigh 15 parts of 10% potassium hydroxide aqueous solution; weigh 45 parts of BZ, 1 part of triethanolamine salt, 0.15 parts of Span-80, 0.15 parts of Tween-40 and deionized water, mix and grind for 4 hours to prepare BZ suspension with a mass fraction of 50%; weigh 90 parts of sulfur, 7.5 parts of triethanolamine salt, 0.15 parts of Span-80, 0.15 parts of Tween-40 and deionized water, mix and grind for 6 hours to make a mass fraction of 50 % sulfur suspension; Weigh 68 parts of zinc oxide, 4 parts of triethanolamine salt, 0.1 part of Span-80, 0.1 part of Tween-40 and deionized water, mix and grind for 6 hours to make a 50% mass fraction of oxide Zinc suspension; Weigh 90 parts of anti-aging agent CPL, 4 parts of triethanolamine salt, 0.1 part of Span-80, 0.1 part of Tween-40 and deionized water, mix and grind for 4 hours to make the anti-aging agent CPL with a mass fraction of 50% Suspension: Weigh 1 part of nano-chitin, and prepare 100 parts of nano-chitin suspension w...

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Abstract

The invention discloses a prevulcanization method of deproteinized natural latex. The method is characterized by: sequentially adding an emulsifier, a vulcanizing agent and an anti-aging agent into deproteinized natural latex, and conducting prevulcanization at 25-70DEG C for 2-8h to obtain pre-vulcanized deproteinized natural latex; and impregnating a model into the pre-vulcanized deproteinized natural latex, then performing heating and drying, forming a rubber mold on the surface of the model, and conducting vulcanizing. According to the invention, the state of the latex can be effectively stabilized, the prevulcanization process of colloidal particles, the viscosity and leveling properties of the latex, the dipping and drying time and the like can be controlled, and the problems of uneven solution distribution, pinholes and flow marks which are easy to occur during dipping and film forming are solved. The obtained impregnated product does not contain protein, does not cause the problem of allergy after contact with the human body, presents physical properties similar to those of any other latex impregnated product containing protein, has stronger moisture resistance and mildew resistance than other impregnated adhesive film products, and is a non-toxic and safe medical product.

Description

technical field [0001] The invention relates to a processing method of deproteinized natural rubber latex, in particular to a prevulcanization method of deproteinized natural rubber latex and a dipped product thereof. Background technique [0002] Compared with conventional natural rubber latex, deproteinized natural rubber latex has great changes in film-forming properties and pre-vulcanization properties. Because the surface of the rubber particles loses the natural protective layer of protein, the dispersion state becomes unstable and susceptible to mechanical disturbance and coagulation , Inhomogeneous film formation, thus limiting the application in dipped products. The green biological source of natural rubber, as well as its excellent film strength, high elasticity and memory are irreplaceable by other materials. It is the preferred material for medical appliances, catheters, tapes, tourniquets, gloves, condoms and other expandable elastic products. However, natural ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/26C08J5/02C08L7/02C08L3/02C08L5/16C08L5/08C08K13/02C08K3/06C08K3/22C08K3/38C08K5/372C08K13/06C08K9/06C08K9/04
CPCC08J3/26C08J5/02C08J2307/02C08J2403/02C08J2405/16C08J2405/08C08K2201/011C08K2003/385C08K13/02C08K3/06C08K2003/2296C08K5/372C08K13/06C08K9/06C08K9/04
Inventor 田晓慧王东起高磊周富强
Owner 田晓慧
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