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Prevulcanized natural rubber latex/polyhydroxybutyrate blend material and preparation method thereof

A technology of polyhydroxybutyrate and natural rubber latex, which is applied in the field of prevulcanized natural rubber latex/polyhydroxybutyrate blend materials and its preparation, and can solve problems such as poor wettability, large particle size, and dehydration of rubber particles. Achieve good physical and mechanical properties and biocompatibility, excellent biocompatibility, and improve surface properties

Active Publication Date: 2017-02-01
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

However, in the actual application of manufacturing medical natural latex products, because powdered polyhydroxybutyrate is insoluble in water, if it is directly added to natural latex, not only because of its large particle size and poor wettability, Dispersion is very poor, and it will cause the rubber particles to dehydrate and solidify

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] a. After stabilizing the concentrated natural latex with a dry rubber content of 100 parts, add the mixed vulcanizing agent dispersion. Described mixing vulcanizing agent dispersion is made up of sulfur, zinc diethyldithiocarbamate (accelerator ZDC) and zinc oxide, consumption is respectively 0.8%, 0.4% and 0.4% of concentrated natural latex dry rubber content), in Heating at 60°C for 2h, leaving it for 3 days, filtering to obtain pre-vulcanized natural rubber latex, adding the anti-aging agent Wingstay L (butylation of p-cresol and dicyclopentadiene) in an amount of 1.0% of the dry rubber content of the concentrated natural latex reaction product) for later use.

[0026] b. 5 parts of polyhydroxybutyrate powder, 20 parts of 20% casein, 10 parts of 10% sodium dinaphthalene sulfonate (diffusion agent NF), 65 parts of deionized water, and use a sand mill at 400rpm Grind for 48 hours at a rotating speed to prepare an aqueous dispersion with a polyhydroxybutyrate content o...

Embodiment 2

[0032] a. In the same way as in Example 1, pre-vulcanized natural rubber latex was prepared for subsequent use.

[0033] b. Grind 7 parts of polyhydroxybutyrate powder, 22 parts of 20% casein, 13 parts of 10% diffusion agent NF, and 58 parts of deionized water with a ball mill at a speed of 600 rpm for 42 hours to prepare polyhydroxybutyrate Aqueous dispersion with 7% ester content.

[0034] c. Add the 7% aqueous dispersion prepared by "b" with 5 parts of polyhydroxybutyrate based on dry weight into "a", stir for 2.5 hours, then filter, stand for defoaming, and obtain emulsion-like pre-vulcanized natural Latex / polyhydroxybutyrate blend materials;

[0035]d. Form the pre-vulcanized natural latex / polyhydroxybutyrate blend material prepared in "c" by ion deposition, and dry it in the air to obtain a blend film. The blend film was leached in flowing deionized water at room temperature for 24 h, and then dried at 50 °C.

[0036] After testing, the tensile strength of the obtaine...

Embodiment 3

[0038] a. In the same way as in Example 1, pre-vulcanized natural rubber latex was prepared for subsequent use.

[0039] b. Grind 10 parts of polyhydroxybutyrate powder, 25 parts of 20% casein, 15 parts of 10% diffusing agent NF, and 50 parts of deionized water with a sand mill at a speed of 800 rpm for 36 hours to prepare polyhydroxybutyrate Aqueous dispersion with 10% butyrate content.

[0040] c. Add the 10% aqueous dispersion prepared by "b" with 10 parts of polyhydroxybutyrate by dry weight into "a", stir for 3.0 hours, then filter, stand for defoaming, and obtain emulsion-like pre-vulcanized natural Latex / polyhydroxybutyrate blend materials;

[0041] d. The pre-vulcanized natural rubber latex / polyhydroxybutyrate blend material prepared in "c" is molded by a casting method, and dried in the air to obtain a blended film. The blend film was leached in flowing deionized water at room temperature for 24 h, and then dried at 50 °C.

[0042] After testing, the tensile streng...

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Abstract

The invention provides a presulfurized natural latex / polyhydroxybutyrate blend material and a preparation method thereof. The presulfurized natural latex / polyhydroxybutyrate blend material comprises the following components in parts by weight on dry basis: 100 parts of presulfurized natural latex and 1.0-10.0 parts of polyhydroxybutyrate. The preparation method comprises the following steps: presulfurizing a concentrated natural latex; preparing polyhydroxybutyrate into a 5-10% polyhydroxybutyrate water dispersion, adding into the presulfurized natural latex, stirring, filtering, and standing for defoaming to obtain an emulsion presulfurized natural latex / polyhydroxybutyrate blend material; and carrying out solidifying, leaching, drying and other conventional techniques for latex product production to obtain the blend rubber film. The method fully utilizes the respective excellent characteristics of the natural latex and polyhydroxybutyrate, so that the prepared natural-latex-base medical material maintains excellent elasticity of the natural rubber, has favorable biocompatibility, and can be used for producing surgical gloves, medical examination gloves, catheters, condoms, drainage tubes and other medical latex products.

Description

technical field [0001] The invention relates to a natural rubber-based blend material and a preparation method thereof, in particular to a prevulcanized natural latex / polyhydroxybutyrate blend material and a preparation method thereof. Background technique [0002] Natural rubber latex (referred to as natural rubber latex) has excellent comprehensive properties such as film-forming properties, wet gel strength, elasticity, film strength and elongation, and easy vulcanization, so it has been widely used, especially for the preparation of medical devices such as condoms. , surgical gloves, medical examination gloves and other film products, as well as various medical drainage tubes such as urinary catheters and T-shaped bile duct drainage tubes. In order to obtain better performance, natural rubber latex is usually pre-vulcanized (pre-vulcanization methods include sulfur vulcanization method, thiuram vulcanization method, organic peroxide vulcanization method and radiation vul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L7/02C08L67/04C08K13/02C08K3/06C08K3/22C08K5/39C08K5/42C08K5/13C08J3/24C08J5/18
CPCC08J3/247C08J5/18C08L7/02C08L67/04C08K13/02C08K3/06C08K2003/2296C08K5/39C08K5/42C08K5/13
Inventor 卢光余和平
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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