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Method for mixing natural rubber by wet process

A natural rubber and mixing technology, applied in the field of wet natural rubber mixing, can solve problems such as solidification, complete and uniform dispersion of difficult chemicals, and affecting the quality of mixed rubber

Active Publication Date: 2012-06-27
CHEMCHINA ZHUZHOU RUBBER RES & DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a disadvantage here: it is difficult to disperse the chemical raw materials evenly in the acid only by acidifying them. At the same time, there are many chemical raw materials added to the latex, and they will solidify as long as they are stirred a little.
The chemical raw materials are not fully and uniformly dispersed in the latex
Secondly, the pH value is in the range of 3.50 to 5.00, which is difficult to operate.
[0005] Another method is to use ordinary latex dispersant to mix chemical raw materials and latex to solidify, but the settling properties of the same raw materials are still difficult to completely and uniformly disperse chemicals, which will affect the quality of the rubber compound

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: 167 parts of solid latex of 60% contain the preparation of the mixed rubber of 20 minutes of carbon black

[0039] Step 1) will count in parts by mass

[0040] Preparation of 10% carbon black dispersion

[0041] carbon black 10

[0042] soft water 88

[0043] Sodium p-vinylbenzenesulfonate 0.50

[0044] NF 0.20

[0045] KOH0.30

[0046] N-phenyl-β-naphthylamine 0.60

[0047] Polyvinyl alcohol 0.20

[0048] Pull open powder BX 0.20

[0049] Prepare a mixture with a carbon black solid content of 10%, grind it for 48-72 hours at a rotational speed of 60 rpm, and pretreat it at 90-95°C for 4 hours to obtain a dispersion;

[0050] 2) Calculate the dispersion prepared in step 1) in parts by mass

[0051] 10% carbon black dispersion 200

[0052] Dilute with soft water 200

[0053] Latex with 60% solid content 167

[0054] Soft water dilution 167

[0055] Microbial Protease 1

[0056] Mix evenly in a mixer with a stirring speed of 20 rpm, and stir at...

Embodiment 2

[0058] Embodiment 2: the latex of 1670 parts of latex of solid content 60%, the preparation of the mixed rubber containing 100 parts of carbon black

[0059] Step 1) will count in parts by mass

[0060] Preparation of 30% carbon black dispersion

[0061] Carbon black 30

[0062] Soft water 67.1

[0063] Sodium p-vinylbenzenesulfonate 0.60

[0064]NF 0.60

[0065] KOH0.60

[0066] N-phenyl-β-naphthylamine 0.50

[0067] Polyvinyl alcohol 0.40

[0068] Pull open powder BX 0.50

[0069] Step 2) as follows

[0070] 30% carbon black dispersion 333

[0071] soft water 333

[0072] Latex with 60% solid content 1670

[0073] Soft water 1670

[0074] Microbial Protease 1

[0075] Other steps are with embodiment 1.

Embodiment 3

[0076] Embodiment 3: the latex of 167 parts of latex of solid content 60%, the preparation of the mixed rubber containing 20 minutes of white carbon black

[0077] Step 1) will count in parts by mass

[0078] Preparation of 10% silica dispersion

[0079] Silica 20

[0080] water 89.6

[0081] Sodium p-vinylbenzenesulfonate 0.40

[0082] NF 0.20

[0083] KOH0.30

[0084] N-phenyl-β-naphthylamine 0.80

[0085] Polyvinyl alcohol 0.40

[0086] Prepare a mixture with a silica content of 10%, grind it for 8 hours at a speed of 60 rpm, and pretreat it at 90~95°C for 4 hours to obtain a dispersion;

[0087] 2) Calculate the dispersion prepared in step 1) in parts by mass

[0088] 10% silica dispersion 200

[0089] Soft water 200

[0090] Latex with 60% solid content 167

[0091] soft water 167

[0092] Microbial Protease 1

[0093] Mix evenly in a mixer with a stirring speed of 20 rpm, and after 4 hours, add 0.5~1.5 parts of 1% acetic acid and stir to fully solidify the m...

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PUM

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Abstract

The invention discloses a method for mixing natural rubber by a wet process. The method will be widely applied in rubber products' filling materials and processing aids such as carbon black, white carbon black, potter's clay, calcium carbonate and other hardly-dispersed chemical materials. The method contains the following steps of: adding a dispersant, an antioxidant, an anti-sinking agent, a wetting agent and water to prepare a mixture with its solid content being 10-50%, grinding for 48-72h, carrying out pretreatment at 90-95 DEG C for 4h to prefabricate a dispersion, uniformly mixing the dispersion with condensed latex, adding microorganism protease and acetic acid, followed by coagulation, washing, and drying to prepare a mixed stock. As the chemical filling material has good dispersing uniformity in the rubber, comprehensive performance of the mixed stock is effectively raised.

Description

technical field [0001] The invention relates to rubber technology and production process, in particular to a wet natural rubber mixing method. Background technique [0002] Natural rubber is a natural product obtained from the fresh latex of the rubber tree, and its dry rubber content is about 30%. Natural rubber is chemically composed of polyisoprene (C 5 h 8 ) composition, the structural formula is (C-CH 2 -CH=CH-CH 2 -CH 2 ) n . At present, the fresh latex is mainly coagulated by acid or microorganisms, and then the water in the coagulated product is squeezed out, and then dried to obtain rubber sheets or blocks. [0003] The traditional mixing process is to first masticate the natural rubber (not sticky ones). Then the required chemical raw materials such as fillers, processing aids, active agents, anti-aging agents, vulcanizing agents, etc. are mixed by an internal mixer or an open mixer to make a rubber compound. In this method, because solid rubber has high t...

Claims

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Application Information

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IPC IPC(8): C08C1/15C08C1/00C08J3/215
Inventor 郭舜华蔡克平孙建华
Owner CHEMCHINA ZHUZHOU RUBBER RES & DESIGN INST
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