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Method for preparing powdered natural rubber by fresh latex

A technology of natural rubber and fresh latex, applied in the field of preparation of powder natural rubber, can solve the problems of unhealthy physical and mental health of environmental workers, easily lead to dust, inapplicability, etc., and achieve the effects of shortening mixing time, improving efficiency and high production efficiency

Inactive Publication Date: 2013-07-24
YUNNAN INST OF TROPICAL CROPS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the processing of rubber products, the particle size of rubber raw materials is too small, which is easy to cause dust, which is not good for the environment and the physical and mental health of workers, and is not suitable as a raw material for the rubber product industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Collect fresh latex in a clean container, pass through a 40-mesh sieve, mix evenly, add 5% ammonia water to adjust the pH to 9.4, heat to 25°C, add 5% coagulant aluminum sulfate solution dropwise while stirring, the amount of aluminum sulfate 3.80% of the mass of the dry glue, until the coagulation is complete, add the inorganic release agent nano-silica under the state of mechanical stirring, the dosage is 6.67% of the mass of the dry glue, and dry it in an oven at 70°C for 3.5h. Stir and dry to obtain powdered natural rubber. The percentage of product particle size greater than 4.0mm is 9.67%, the percentage of 1.0-4.0mm is 84.79%, and the percentage of less than 1.0mm is 5.54%. The mechanical properties of vulcanized rubber: tensile The tensile strength is 23.7 Mpa, the 300% modulus stress is 2.3Mpa, the 500% modulus stress is 6.2Mpa, and the elongation at break is 770%.

Embodiment 2

[0018] Collect fresh latex in a clean container, pass through a 40-mesh sieve, mix well, add 5% ammonia water to adjust the pH to 9.3, heat to 35°C, add 10% coagulant aluminum sulfate solution dropwise while stirring, the amount of aluminum sulfate 3.69% of the mass of the dry glue, until the coagulation is complete, add an inorganic release agent nano-silica under the state of mechanical stirring, the dosage is 10% of the mass of the dry glue, and dry it in an oven at 90°C for 2 hours, and proper drying is required during the drying period. Stir and dry to obtain powdered natural rubber. The percentage of product particle size greater than 4.0mm is 7.81%, the percentage of 1.0-4.0mm is 83.30%, and the percentage of less than 1.0mm is 8.89%. Mechanical properties of vulcanized rubber: tensile The strength is 22.3Mpa, the 300% modulus stress is 2.15Mpa, the 500% modulus stress is 5.52Mpa, and the elongation at break is 730%.

Embodiment 3

[0020] Collect fresh latex in a clean container, pass through a 40-mesh sieve, mix well, add 5% ammonia water to adjust the pH to 9.5, heat to 30°C, add 15% coagulant aluminum sulfate solution dropwise while stirring, the amount of aluminum sulfate 3.94% of the dry glue mass, until the coagulation is complete, add the inorganic release agent nano-calcium carbonate under the state of mechanical stirring, the dosage is 13.3% of the dry glue mass, dry in an oven at 80°C for 3 hours, and proper stirring is required during the drying period After drying, powdered natural rubber is obtained. The percentage of product particle size greater than 4.0mm is 6.61%, the percentage of 1.0-4.0mm is 86.25%, and the percentage of less than 1.0mm is 7.14%. The mechanical properties of vulcanized rubber: tensile strength It is 18.4Mpa, the 300% modulus stress is 2.14Mpa, the 500% modulus stress is 6.01Mpa, and the elongation at break is 700%.

[0021] The "concentration" mentioned above is the m...

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Abstract

The invention provides a method for preparing powdered natural rubber by field latex. The method comprises the following steps of: sieving the field latex by a 40-mesh sieve, uniformly mixing, adjusting the pH to 9.2 to 10.0 by using ammonia water, heating to 25-35 DEG C, adding aluminum sulfate solution serving as a flocculant while stirring, wherein the using amount of aluminum sulfate is 2 to 5 percent of the mass of dry latex; after complete agglomeration, adding nano-silica or nano-calcium carbonate serving as an inorganic isolation agent in a mechanical stirring state, wherein the using amount of the inorganic isolation agent is 5 to 15 percent of the mass of the dry latex; and drying to finally obtain the powdered natural rubber. More than 83 percent of powdered natural rubber is 1.0 to 4.0 millimeters in particle size, and more than 90 percent powdered natural rubber is 0.5 to 4.0 millimeters in particle size; the tensile strength of vulcanized rubber is 18.0 to 24.0 MPa; 300%stress at definite elongation is 2.0 to 3.0 MPa; 500% stress at definite elongation is 5.0 to 7.0 MPa; and the pull-apart elongation rate is 700 to 800 percent. The method has the outstanding advantages that the powdered natural rubber is dried easily and high in mechanical performance; the method is simple and operated easily; the water consumption amount and the waste water discharging amount are small; the performance of the powdered natural rubber is improved; the powdered natural rubber is energy-saving and environment-friendly; and an aim of improving the benefit of the field latex processing industry is fulfilled.

Description

technical field [0001] The invention relates to a method for preparing powdered natural rubber, in particular to a method for preparing powdered natural rubber with fresh latex. Background technique [0002] Powdered rubber, also known as free-flowing rubber or granular rubber, will not stick to itself during storage and transportation, and is in a granular state. At present, there is no strict regulation on its particle size, ranging from real powder rubber less than 1mm to rubber particles as large as 10mm. [0003] Powdered rubber has the advantages of easy metering, easy processing automation and continuous processing, and achieves the goals of reducing equipment investment, simplifying the process, saving energy and improving production efficiency. It is called "a new generation of raw materials that can simplify production". For a long time, the rubber industry has used block rubber raw materials (each weighing 25-50kg) to produce rubber products. Not only is it incon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L7/00C08K3/36C08K3/26C08C1/15
Inventor 张桂梅姜士宽邹建云徐荣伍英郑文代郭刚军
Owner YUNNAN INST OF TROPICAL CROPS