Microencapsulated rubber accessory ingredient

A technology of rubber additives and microcapsules, which is applied in the field of encapsulated rubber additives coated with microcapsules and its preparation, which can solve problems such as uncontrollable heating, poor test repeatability, and difficult control of reaction conditions.

Inactive Publication Date: 2010-07-14
BEIJING RES & DESIGN INST OF RUBBER IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual rubber processing process, the friction force during rubber mixing will cause uncontrollable heating, and the difference between the stable temperature and melting temperature of the capsule wall is extremely small, making it difficult to control in rubber production and not practically applied.
Chinese patent application publication CN101263192A proposes to adopt melamine-formaldehyde resin as the wall material microcapsule sulfur, the method is difficult to control the reaction conditions in actual operation, and the test repeatability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Embodiment 1 single-layer polyurethane IPN microcapsule sulfur

[0073] 20.00 g of polyoxypropylene diol (DL-400) and 14.49 g of toluene diisocyanate (TDI) were added to a four-neck reaction flask, and 2.00 mL of methyl ethyl ketone and 0.5 μL of catalyst dibutyltin dilaurate (T-12) were added. Raise the temperature to 80°C and react for 90 minutes. 1.10mL of triethylamine and 2.00mL of deionized water were dropped into the reaction solution, continued to stir vigorously for 20min, and left to stand to obtain a water-based polyurethane (WPU) prepolymer emulsion.

[0074] Add 3.15g WPU prepolymer emulsion, 3.85g butyl acrylate, 3.00g styrene, 0.5g emulsifier octylphenol ethoxylate (OP-10), 50g sulfur powder and 0.3g potassium persulfate to the reaction bottle , stirring rapidly at a stirring speed of 800r / min to fully disperse it in 480mL of water, raise the temperature to 70°C, and react for 120min. After washing with water, filtering and drying, microcapsule-coated s...

Embodiment 2

[0075] Embodiment 2 single-layer polyurethane IPN microcapsule sulfur

[0076] The preparation of WPU prepolymer emulsion is as in Example 1.

[0077] Add 3.15g WPU prepolymer emulsion, 3.85g epoxy resin E-44 (Baling petrochemical products), 3.00g styrene, 0.5g emulsifier sodium dodecyl sulfate (SDS), 50g sulfur powder in the reaction bottle and 0.3g of potassium persulfate, stirred rapidly at a stirring speed of 800r / min to fully disperse it in 480mL of water, heated to 70°C, and reacted for 120min. Washed with water, filtered, and dried to obtain microcapsule-coated sulfur 2#. Tested by the same method, the yield of the microcapsule sulfur was 94.3%, the coating rate was 75.7%, and the particle size of the microcapsule was 20 μm.

Embodiment 3

[0078] Embodiment 3 single-layer polyurethane IPN microcapsule sulfur

[0079] The preparation of WPU prepolymer emulsion is as in Example 1.

[0080] Add 3.15g WPU prepolymer emulsion, 6.85g styrene, 0.5g emulsifier octylphenol polyoxyethylene ether (OP-10), 50g sulfur powder and 0.3g potassium persulfate to the reaction bottle, and stir at 800r / min Stir at a high speed to fully disperse it in 480mL of water, raise the temperature to 70°C, and react for 120min. Washed with water, filtered, and dried to obtain microcapsule-coated sulfur 5#. Tested by the same method, the yield of the microcapsule sulfur was 92.5%, the coating rate was 70.7%, and the particle size of the microcapsule was 20 μm.

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Abstract

The invention discloses a microencapsulated rubber accessory ingredient and a preparation method thereof. The microencapsulated rubber accessory ingredient comprises polymer capsule wall and capsule-core containing rubber accessory ingredient, and the capsule wall is polyurethanes interpenetrating network polymer. The capsule wall can also have an internal capsule wall which can be cross-linking vinyl polymer, polyacrylic ester or polyurethanes interpenetrating network polymer. The microencapsulated rubber accessory ingredient is prepared by emulsion polymerization method preferably. In the invention, polyurethanes interpenetrating network polymer is adopted to carry out microencapsulation on general sulphur, technique is mature, operation is simple, test repetitiveness is good, and encapsulation rate is high. Capsule wall does not release free sulphur during mixing, rolling and extruding, but quickly releases sulphur during vulcanization at 130 DEG C to finish cross-linking of rubber material.

Description

technical field [0001] The present invention relates to nano- or micron-sized microcapsules and a production method thereof, more particularly, to a microcapsule-coated encapsulated rubber additive and a preparation method thereof. Background technique [0002] Sulfur is the most commonly used vulcanizing agent in the rubber industry. Since the solubility of sulfur in rubber increases with the increase of temperature, when the amount of sulfur added is large, part of the sulfur will precipitate on the surface of the rubber in the form of crystals after the rubber mixture is cooled, and the phenomenon of "blooming" will appear. "Blooming" not only affects the appearance of rubber products, but also affects the adhesion between semi-finished parts, which has an adverse effect on the performance of the product. [0003] There are two ways to prevent "blooming": one is to use sulfur with a larger molecular weight, that is, insoluble sulfur; the other is to use microcapsules to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/10C08K3/06C08L21/00B01J13/14
Inventor 陆铭李花婷王宇翔陈宏王婷王永伟
Owner BEIJING RES & DESIGN INST OF RUBBER IND
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