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40-degree natural rubber and production process thereof

A technology of natural rubber and natural raw rubber, which is applied in the field of 40-degree natural rubber and its production process, can solve the problems of high production cost, achieve low production cost, good load-bearing compression and natural frequency, and clean surface

Active Publication Date: 2013-06-05
北京市长城机床附件有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0034] The natural rubber prepared in the prior art has certain defects in aging resistance, elongation at break, rebound value, wear resistance, bearing compression, natural frequency, etc., and the production cost of a small amount of products with better performance is relatively low. high

Method used

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  • 40-degree natural rubber and production process thereof
  • 40-degree natural rubber and production process thereof
  • 40-degree natural rubber and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] Prepare 40 degree natural rubber of the present invention according to the following steps:

[0117] (1) Rubber drying: put 55.5g of natural raw rubber in an oven at 60°C, and bake the rubber for 4 hours;

[0118] (2) Gum breaking: The natural raw rubber after drying is immediately broken. The roller distance is 0.5mm when the glue is broken;

[0119] (3) First mastication: Divide the raw natural rubber into 3 equal parts, each weighing 18.5 kg. The roller distance is 0.5mm, and it is required to roll and turn 90° for the next plasticizing. Roll over 12 times continuously;

[0120] (4) After parking for 4 hours, carry out the second mastication. The second plasticizing roller distance is adjusted to 0.5mm, coiled and turned 90 ° for the next plasticizing, and the rollers are passed continuously for 12 times. After parking for 4 hours, enter the mixing process;

[0121] (5) Mixing: Put the masticated raw rubber into the open mill to make it covered with rolls. Afte...

Embodiment 2

[0126] Prepare 40 degree natural rubber of the present invention according to the following steps:

[0127] (1) Rubber drying: put 50g of natural raw rubber at 70°C, and bake the rubber for 3 hours;

[0128] (2) Gum breaking: The natural raw rubber after drying is immediately broken. The roller distance is 0.3mm when the rubber is broken;

[0129] (3) First mastication: Divide the natural raw rubber into 3 equal parts, each weighing about 16.667kg. The roller distance is 0.3mm, and it is required to roll and turn 90° for the next plasticizing. Roll over 18 times continuously;

[0130] (4) After parking for 5 hours, carry out the second mastication. The second plasticizing roll distance is adjusted to 0.3mm, coiled and turned 90° for the next plasticizing, and the rollers are passed continuously for 18 times. After parking for 5 hours, enter the mixing process;

[0131] (5) Mixing: Put the masticated raw rubber into the open mill to make it covered with rolls. After compl...

Embodiment 3

[0133] Prepare 40 degree natural rubber of the present invention according to the following steps:

[0134] (1) Rubber drying: put 59.95g of natural raw rubber at 30°C, and bake the rubber for 5 hours;

[0135] (2) Gum breaking: The natural raw rubber after drying is immediately broken. The roller distance is 0.9mm when the glue is broken;

[0136] (3) First mastication: Divide the raw natural rubber into 3 equal parts, each weighing 19.98 kg. The roller distance is 0.9mm, and it is required to roll and turn 90° for the next plasticizing. Roll over 10 times continuously;

[0137] (4) After parking for 4 hours, carry out the second mastication. The second plasticizing roller distance is adjusted to 0.9mm, coiled and turned 90° for the next plasticizing, and the rollers are passed continuously for 10 times. After parking for 4 hours, enter the mixing process;

[0138] (5) Mixing: Put the masticated raw rubber into the open mill to make it covered with rolls. After complete...

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Abstract

The invention discloses a 40-degree natural rubber and a production process thereof. The 40-degree natural rubber comprises the following raw materials in percentage by weight: 50-60 percent of natural crude rubber, 0.5-2.5 percent of vulcanizing agent, 30-42 percent of medium thermal carbon black, 2.05-4.1 percent of activating agent, 0.03-0.7 percent of accelerating agent, 0.55-3.2 percent of anti-aging agent and 1-2.2 percent of plasticizing agent. 40-degree natural rubber which is remarkably improved on the aspects of aging resistance, elongation at break, wear resistance, rebound value, bearing decrement, inherent frequency, production cost and the like is obtained by performing rubber baking, rubber breaking, secondary plastifying and compounding.

Description

technical field [0001] The present invention relates to a kind of natural rubber and its production process, specifically, the present invention relates to a kind of 40 degree natural rubber and its production process. Background technique [0002] Natural rubber refers to rubber made from natural rubber-producing plants. Natural rubber is a natural polymer compound with polyisoprene as the main component, and its molecular formula is (C 5 h 8 ) n , 91% to 94% of its components are rubber hydrocarbons (polyisoprene), and the rest are non-rubber substances such as proteins, fatty acids, ash, and sugars. Natural rubber is the most widely used general-purpose rubber. [0003] Natural rubber raw rubber has no definite melting point and is slightly plastic at room temperature. It will soften slowly as the temperature rises, and it will completely soften at 130-140°C. It will decompose at about 200°C, and it will decompose sharply at 270°C. When the temperature is lowered, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L7/00C08K13/02C08K3/04B29B7/00
Inventor 方学金王燕生马薇薇
Owner 北京市长城机床附件有限责任公司