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Method for solidifying nature rubber latex with microwave radiation

A technology of natural rubber emulsion and microwave radiation, which is applied in the field of natural rubber rubber production, can solve problems such as easy pollution of the environment, complex processes, and raw rubber, and achieve the effects of economical and efficient production, simple production process, and high production recovery rate

Inactive Publication Date: 2009-09-02
廖芸 +6
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the diversity of microorganisms, natural coagulation or biological coagulation still has problems such as odor, swelling, too soft or too hard clot, and raw rubber, and is greatly affected by natural conditions such as temperature, strain, etc. The production process and product quality The consistency is not easy to control
[0004] The natural rubber emulsion is centrifuged, concentrated and separated to obtain concentrated latex and skim. Due to the high concentration of ammonia and low dry rubber content in the skim, currently the coagulation of the skim is usually coagulated with sulfuric acid. Therefore, the skim wastewater contains a high concentration Sulfate ions and ammonia ions are easy to pollute the environment, and the treatment of glue clear wastewater requires more complicated processes and higher costs to meet the standards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 1Kg of fresh natural rubber latex with 28% dry rubber content in a beaker, treat the latex with microwave radiation with a frequency of 2450MHZ and a power of 600W for 30 seconds to flocculate, and mature for 2 hours to form a clot without white water. After the agglomerate is squeezed, dehydrated, granulated and dried, the quality index and performance of the dry glue are determined.

[0022] Quality index and performance: impurity content is 0.015%, plasticity initial value P0 is 40, plastic retention rate PRI is 85%, nitrogen content is 0.55%, ash content is 0.3%, Mooney viscosity is 80 units; curing time of pure rubber formula -90 is 7 minutes, the tensile strength is 27.5MPa, and the elongation at break is 900%.

Embodiment 2

[0024] In a beaker, 1Kg of fresh natural rubber latex with a dry rubber content of 32% was taken, and the latex was coagulated by microwave radiation with a frequency of 915MHZ and a power of 900W for 25 seconds to flocculate, and matured for 2 hours to form a white water-free clot. After the agglomerate is squeezed, dehydrated, granulated and dried, the quality index and performance of the dry glue are determined.

[0025] Quality index and performance: impurity content is 0.018%, plasticity initial value P0 is 40, plasticity retention rate PRI is 86%, nitrogen content is 0.56%, ash content is 0.3%, Mooney viscosity is 81 units; curing time of pure rubber formula -90 is 6.8 minutes, the tensile strength is 27.5 MPa, and the elongation at break is 880%.

Embodiment 3

[0027] Take 1Kg of fresh latex with a dry rubber content of 30% in a beaker. Use a hose long enough to make the latex flow through a microwave radiation field with a frequency of 915MHZ and a power of 900W for more than 20 seconds. When the latex flocculates, collect and flow through the microwave. The flocculent gel emulsion in the field is matured for 2 hours to form a white water-free clot. After the agglomerate is squeezed, dehydrated, granulated and dried, the quality index and performance of the dry glue are determined.

[0028] Quality index and performance: impurity content is 0.016%, plasticity initial value P0 is 40, plastic retention rate PRI is 83%, nitrogen content is 0.55%, ash content is 0.3%, Mooney viscosity is 80 units; curing time of pure rubber formula -90 is 6.8 minutes, the tensile strength is 27.5 MPa, and the elongation at break is 890%.

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Abstract

The invention discloses a method for solidifying nature rubber latex with microwave radiation, which is characterized in that nature rubber latex is radiated by microwave under the flowing or static state to obtain flocculent gel, the flocculent gel is solidified and cured to obtain curds, and the curds are pressed to be thinned, dehydrated, granulated and dried. The invention has simple production technology and low cost, realizes the full rubber latex solidification with no chemical substances added to ensure that all the substances in the rubber latex are not influenced by the chemical action, preserves the water insoluble components in the rubber latex, keeps high performance of the product, has good quality and high production recovery ratio, and is green and environmentally-friendly and high efficient and economical in production.

Description

Technical field [0001] The invention belongs to the technical field of natural rubber preparation, and specifically relates to a method for coagulating natural rubber emulsion by microwave radiation. Background technique [0002] In addition to containing rubber hydrocarbons and water, natural rubber emulsion also contains a large amount of non-gelatinous substances such as proteins, lipids, organic acids and sugars. The rubber particles in the natural rubber emulsion are protected by an electric double layer composed of hydrophilic substances such as proteins and lipids, so that the natural rubber emulsion can maintain a stable colloidal state. The natural rubber emulsion is contaminated by microorganisms, or the addition of acid, inorganic salt, heating, freezing, radiation, etc. can make the rubber emulsion lose its stability and coagulate or gel. At present, the coagulation methods of natural rubber emulsion are mainly chemical methods and biological methods. One is the chemi...

Claims

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Application Information

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IPC IPC(8): C08C1/14
Inventor 廖芸廖建和赵艳芳廖双泉王桂春王向前陈永平
Owner 廖芸
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