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Presulfurized natural 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: 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

Benefits of technology

This patented technology solves problems related to mixing naturally occurring rubbers (NR), making it easier to produce them without adding chemicals or solvents during processing. Additionally, this new formulation provides superior stability over time when stored before use on different types of equipment like tires due to its improved colloid characteristics compared to traditional methods. Overall, these technical improvements help create stronger and more durable films while reducing environmental concerns associated therewith.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding ways to modify naturally occurring rubbers without causing negative effects like bad tensiles that can affect their overall quality and usages.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] a. After stabilizing the concentrated natural rubber latex with a dry rubber content of 100 parts, add the mixed vulcanizing agent dispersion. The mixed vulcanizing agent dispersion is composed of sulfur, zinc diethyldithiocarbamate (accelerator ZDC) and zinc oxide, and the dosage is respectively 0.8%, 0.4% and 0.4% of the dry rubber content of the concentrated natural rubber latex). Heated at 60°C for 2 hours, left for 3 days, and filtered to obtain pre-vulcanized natural rubber latex. Add the anti-aging agent Wingstay L (p-cresol and dicyclopentadiene butylation) in an amount of 1.0% of the dry rubber content of the concentrated natural rubber latex The reaction product) is ready for use.

[0026] b. Combine 5 parts of polyhydroxybutyrate powder, 20 parts of 20% casein, 10 parts of 10% sodium methylene dinaphthalene sulfonate (diffusing agent NF), and 65 parts of deionized water with a sand mill at 400 rpm Grind for 48h at a rotating speed to prepare an aqueous dispersi...

Embodiment 2

[0032] a. Prepare pre-vulcanized natural rubber latex in the same way as in Example 1.

[0033] b. 7 parts of polyhydroxybutyrate powder, 22 parts of 20% casein, 13 parts of 10% diffusing agent NF, and 58 parts of deionized water are ground with a ball mill at 600rpm for 42h to prepare polyhydroxybutyrate An aqueous dispersion with an acid ester content of 7%.

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

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

[0036] After testing, the tensile strength of the obtained pre-vulcanized latex / poly...

Embodiment 3

[0038] a. Prepare pre-vulcanized natural rubber latex in the same way as in Example 1.

[0039] b. 10 parts of polyhydroxybutyrate powder, 25 parts of 20% casein, 15 parts of 10% diffusing agent NF, 50 parts of deionized water, grind with a sand mill at 800rpm for 36h to prepare polyhydroxy An aqueous dispersion with a 10% butyrate content.

[0040] c. Add 10% water dispersion prepared by "b" with 10 parts of polyhydroxybutyrate based on dry weight and add to "a", stir for 3.0h, then filter and stand for defoaming to obtain emulsion-like pre-vulcanized natural Latex / polyhydroxybutyrate blend material;

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

[0042] After testing, the tensile strength of the obtained pre-vulcanized latex / polyhydroxybutyr...

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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

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Claims

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Application Information

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Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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