Wet smelting method for preparing natural rubber/nanometer silicon dioxide rubber compound

A nano-silica, natural rubber latex technology, applied in the direction of rolling resistance optimization, road transportation emission reduction, etc., can solve the problems of low content of natural emulsifier, damage to stability, and high production cost of concentrated natural rubber latex

Active Publication Date: 2012-11-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Concentrated natural rubber latex is concentrated from fresh natural rubber latex through centrifugation to remove the latex. When the latex is removed, the latex is lost. Therefore, the production rate of natural rubber latex is 82% to 86%. And consume power labor, cause the production cost of adopting concentrated natural rubber latex to be high
Fresh natural rubber latex contains natural emulsifiers, which are excluded together with the skim during the concentration process, resulting in a low content of natural emulsifiers in the concentrated natural rubber latex, which will coagulate and agglomerate when mixed with the filler slurry; it should be uniform with the filler slurry When mixing to form a stable blend system, an emulsifier must be added, which not only increases the produ

Method used

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  • Wet smelting method for preparing natural rubber/nanometer silicon dioxide rubber compound
  • Wet smelting method for preparing natural rubber/nanometer silicon dioxide rubber compound
  • Wet smelting method for preparing natural rubber/nanometer silicon dioxide rubber compound

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) The basic operation process of preparing natural rubber / nano-silica compound by in-situ generation-wet milling method

[0040] Determination of mass percent concentration of fresh natural rubber latex and SiO of silica sol 2 content. Add fresh natural rubber latex containing 100g of NR dry solids into a stainless steel beaker with a volume of 2 liters equipped with a stirrer and a water bath automatic temperature control heating device, add a predetermined amount of clean water to dilute it to the required concentration, and set aside . Add a predetermined amount of clean water and a treatment agent into a stainless steel beaker with a volume of 2 liters, add a predetermined amount of silica sol containing nano-silica during stirring, and stir evenly to form a silica sol with a desired concentration of nano-silica aqueous solution. Add the diluted natural rubber latex into the aqueous silica sol solution during stirring, heat in a water bath after stirring for 10...

example 1-1

[0046] Wet milling conditions: NR dry solid content 100g, diluted fresh natural rubber latex NR dry solid mass percentage concentration 20%; silica sol type / particle size: alkaline sodium salt / 7~9nm, alkaline sodium salt / 10nm , Alkaline monocrystalline silicon / 10nm, Alkaline sodium salt / 30nm, Alkaline ammonium salt / 5~15nm, Neutral / 8~15nm and Acidic / 10nm, the amount of silica sol converted to nano silica is 70g, silica sol SiO in aqueous solution 2 The mass percent concentration is 15%; the type / amount of treatment agent: diethylene glycol / 7g; the reaction temperature is 80°C, and the reaction time is 1 hour; the type / amount / concentration of coagulant: calcium chloride / 2.1g / 5%.

[0047] Basic vulcanization formula 1 (parts by mass): NR 100 (calculated as dry rubber), nano-silica 70, stearic acid 2.0, ZnO 5.0, accelerator DM 1.3, accelerator TT 0.2, anti-aging agent 4010NA 1.5, sulfur 2.2.

[0048] Table 1-1 is the relationship between the type of silica sol and its particle si...

example 1-2

[0052] Wet milling conditions: the amount of NR dry solids is 100g, the mass percentage concentration of NR dry solids diluted with fresh natural rubber latex is 20%; the type / particle size of silica sol: alkaline sodium salt / 7~9nm, silica sol is converted to nanometer The amount of silicon oxide is 70g, the SiO of the silica sol aqueous solution 2 Mass percent concentration 15%; treatment agent type / amount: OP-10 / 7g, AE0-9 / 7g, ethylene glycol / 7g, diethylene glycol / 7g, triethylene glycol / 7g, 1,2-propanediol / 7g , butylene glycol / 7g and neopentyl glycol / 7g; reaction temperature 80°C, reaction time 1 hour; flocculant type / amount / concentration calcium chloride / 2.1g / 5%.

[0053] Basic vulcanization formula 1 (parts by mass): NR 100 (calculated as dry rubber), nano-silica 70, stearic acid 2.0, ZnO 5.0, accelerator DM 1.3, accelerator TT 0.2, antioxidant 4010NA 1.5, sulfur 2.2.

[0054] Table 1-2 is the relationship between the type of treatment agent and the physical and mechanical...

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Abstract

The invention discloses a wet smelting method for preparing a natural rubber/nanometer silicon dioxide rubber compound, which comprises the following steps of: mixing natural rubber latex with silicon sol solution to form a wet smelting system; heating the silica sol to generate condensation reaction to generate the SiO2 gel with properties, heating the wet smelting system to generate the silica sol into nanometer silicon dioxide particles in situ and uniformly dispersing the nanometer silicon dioxide particles into NR (Natural Rubber) emulsion to form the NR/ nanometer silicon dioxide rubber compound after condensation and co-precipitation; and mixing the natural rubber latex with a nanometer silicon dioxide dispersing body to form the NR/ nanometer silicon dioxide rubber compound after condensation and co-precipitation. The wet smelting method has the beneficial effects that the mass ratio of natural rubber/nanometer silicon dioxide prepared by the wet smelting method is 100/30-90, and vulcanized rubber of the nanometer silicon dioxide has excellent physical and mechanical properties and is high-quality rubber for preparing truck radial tire tread rubber with high wet skid resistance and low rolling resistance, i.e. green tire.

Description

technical field [0001] The present invention relates to the preparation technology of rubber reinforcing material. Be specifically related to a kind of natural rubber / nanometer silicon dioxide composite material prepared with natural rubber (NR) fresh latex and silica sol or nano silicon dioxide (nano silicon dioxide) dispersion as raw material That is, the wet mixing method of rubber compound. Background technique [0002] Rubber needs to be reinforced with filling and reinforcing agents, and its vulcanized rubber products are of value. Carbon black is the most important reinforcing agent for rubber, with the best reinforcing effect and the largest dosage; followed by white carbon black, but white carbon black is not as good as carbon black in terms of reinforcing effect. In the field of rubber industry, the amount of white carbon black is not as large as that of carbon black. [0003] Carbon black is produced by incomplete combustion of heavy oil or natural gas at high t...

Claims

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Application Information

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IPC IPC(8): C08J3/22C08L7/02C08K9/04C08K3/36
CPCY02T10/86
Inventor 王炼石林艳芬
Owner SOUTH CHINA UNIV OF TECH
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