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Presulfurized natural latex/chitosan/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/chitosan/polyhydroxybutyrate blended materials and its preparation, can solve the problems that blended materials have not yet been studied, and achieve good results. The effect of physical mechanical properties and biocompatibility, excellent biocompatibility, and good elongation

Active Publication Date: 2015-07-22
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

[0005] At present, there is no relevant research on the preparation of blended materials using the excellent characteristics of natural rubber latex, chitosan and polyhydroxybutyrate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 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, and consumption is respectively 0.8%, 0.4% and 0.4% of concentrated natural latex dry rubber content, at 60 Heating at ℃ for 2h, leaving it for 3 days, filtering to obtain pre-vulcanized natural rubber latex, adding the antioxidant WingstayL (the butylated reaction product of p-cresol and dicyclopentadiene) which is 1.0% of the dry rubber content of concentrated natural rubber latex )spare.

[0030] b. 2.5 parts each of chitosan powder and polyhydroxybutyrate powder, 20 parts of 20% casein, 10 parts of 10% sodium dinaphthalene sulfonate (diffusion agent NF), 65 parts of deionized water, and The sand mill grinds for 48h at the speed of 400rpm to make an aqueous dispersion of chitosan and polyhydroxybutyrate w...

Embodiment 2

[0036] a. In the same way as in Example 1, pre-vulcanized natural rubber latex was prepared for subsequent use.

[0037] b. Each 3.5 parts of chitosan powder and polyhydroxybutyrate powder, 22 parts of 20% casein, 13 parts of 10% diffusing agent NF, and 58 parts of deionized water were ground with a ball mill at a speed of 600 rpm for 42 hours , made of chitosan and polyhydroxybutyrate content of 7% water dispersion.

[0038] c. adding 7% chitosan and polyhydroxybutyrate water dispersion prepared by step b to 5 parts of chitosan and polyhydroxybutyrate by dry weight in the prevulcanized natural rubber latex prepared by step a, stirring 2.5h, then filter, stand defoaming, obtain prevulcanized natural rubber latex / chitosan / polyhydroxybutyrate blended emulsion;

[0039] d. molding the pre-vulcanized natural latex / chitosan / polyhydroxybutyrate blend emulsion prepared in step c, and drying in the air to obtain a blend film. The blended film was leached in flowing deionized water a...

Embodiment 3

[0042] a. In the same way as in Example 1, pre-vulcanized natural rubber latex was prepared for subsequent use.

[0043] b. 5 parts each of chitosan powder and polyhydroxybutyrate powder, 25 parts of 20% casein, 15 parts of 10% diffusing agent NF, 50 parts of deionized water, and grind for 36 hours with a sand mill at a speed of 800rpm , made of chitosan and polyhydroxybutyrate content of 10% water dispersion.

[0044] c. adding 10% chitosan and polyhydroxybutyrate water dispersion prepared by step b to 10 parts of chitosan and polyhydroxybutyrate by dry weight in the prevulcanized natural rubber latex prepared by step a, stirring 3.0h, then filter, stand defoaming, obtain prevulcanized natural rubber latex / chitosan / polyhydroxybutyrate blended emulsion;

[0045] d. molding the pre-vulcanized natural latex / chitosan / polyhydroxybutyrate blend emulsion prepared in step c, and drying in the air to obtain a blend film. The blended film was leached in flowing deionized water at roo...

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Abstract

The invention provides a presulfurized natural latex / chitosan / polyhydroxybutyrate blend material and a preparation method thereof. The presulfurized natural latex / chitosan / polyhydroxybutyrate blend material comprises the following components in parts by weight on dry basis: 100 parts of presulfurized natural latex, 0.5-5.0 parts of chitosan and 0.5-5.0 parts of polyhydroxybutyrate. The preparation method comprises the following steps: presulfurizing a concentrated natural latex; preparing chitosan and polyhydroxybutyrate into a 5-10% chitosan / polyhydroxybutyrate water dispersion, adding into the presulfurized natural latex, stirring, filtering, and standing for defoaming to obtain an emulsion presulfurized natural latex / chitosan / 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, chitosan 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, in particular to a prevulcanized natural latex / chitosan / polyhydroxybutyrate blend material and a preparation method. 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 vulcanizat...

Claims

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Application Information

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IPC IPC(8): C08L7/02C08L5/08C08L67/04C08J5/18
CPCC08J3/24C08J5/18C08J2307/00C08L7/02C08L2203/02C08L2203/16C08L2205/03C08L5/08C08L67/04C08K13/02C08K3/06C08K2003/2296C08K5/39C08K5/13
Inventor 卢光余和平王永周罗勇悦曾宗强
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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