Organic peroxide master batches and preparation method thereof

An organic peroxide and peroxide technology, applied in the field of peroxide master batch preparation, can solve the problems of low peroxide concentration, difficulty, heating, etc., and achieve the effects of improving dispersion performance, processing safety, and simple equipment

Active Publication Date: 2012-07-11
GUANGZHOU LUSHAN NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the instruments commonly used to prepare masterbatch are open mills or screw extruders. These instruments have their own shortcomings and deficiencies, because these instruments need to heat the material, and the shearing of these instruments is relatively strong, which is easy to cause Decomposition of organic peroxides
[0005] At present, there is no patent on the preparation method of organic peroxide masterbatches in China, mainly because it is very difficult to prepare high-concentration peroxide masterbatches. Peroxide masterbatch, and the risk is relatively high
Chen Hong used a twin-screw extruder to produce polypropylene peroxide masterbatch in "Production Control of Polypropylene Peroxide Concentrated Masterbatch", studied the peroxide injection port and adding method, and obtained the best peroxide The entrance should be at the mouth die, and the feeding method can be selected as a side weight feeder or a high-pressure metering pump system, and then control the production process through a pressure gauge and a decreasing amount of peroxide. This method has great limitations. First, this method is not suitable for most polymers; second, the concentration of peroxide produced is relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 1.5 liters of water to a 3 liter beaker and heat the water to 90°C. 130 g of EPDM (ethylene-propylene-diene rubber is a terpolymer of ethylene, propylene, and non-conjugated diene) was pulverized into particles and dispersed in a beaker (particle size: 5 mm). After 5 minutes, add 90 grams of dicumyl peroxide to the beaker and disperse it at a low speed (2000 rpm). After stirring for 5 minutes, increase the rotational speed to 10000 rpm. At the end of the stirring process, the temperature was 75°C. After stirring, the polymer particles were cooled in cold water. When the stirrer has cooled, the polymer fragments are separated from residual water and peroxide and allowed to air dry. After this treatment process, the size of the polymer particles is in the range of 0.5-3 mm, and the concentration of the prepared peroxide master batch is 34.8%.

Embodiment 2

[0026] In a 3 liter beaker, add 260g ethylene-vinyl acetate copolymer pellets (ball diameter 2mm, thickness 0.5-3mm), EVA is dispersed in 1.5 liters of water at 80 ℃. 235 g of 1,3-1,4 di-tert-butyl cumene peroxide were added to the mixture, initially dispersed at low speed (2000 rpm) and stirred for 5 minutes. Then increase the speed to 10000 rpm. Finally, the mixture was cooled to 50°C with ice. Screen the peroxide masterbatch, cool and dry. The masterbatch contains 36.3% peroxide.

Embodiment 3

[0028] Add 260g of dicumyl peroxide and 600ml of water to a stirrer and heat to 60°C. Then start the stirrer, and add 340g polyolefin elastomer pellets (ball diameter 2mm, thickness 0.5-3mm) in the stirrer. The stirrer was stirred at 65° C. for 60 minutes, followed by cooling under stirring for 15 minutes. Finally, the obtained peroxide masterbatch is screened and dried. The free-rolling masterbatch contains 42.1% peroxide.

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Abstract

The invention discloses organic peroxide master batches and a preparation method of the master batches. The master batches take polyolefine elastomer (POE), ethylene-vinyl acetate copolymer (EVA), ethylene-propylene-butadiene ethylene-propylene diene monomer (EPDM) and other polymer as a substrate resin; and the selected peroxide is required to cross-link the substrate resin. The substrate resin granules are added in a liquid emulsion medium, which contains 0-98% of peroxide; at certain temperature and after enough long time, the polymer granules absorb the peroxide to prepare the peroxide master batches with 20-50% high concentration; and after the peroxide is absorbed, the liquid medium is required to exist around the polymer granules at certain quantity. The peroxide master batches disclosed by the invention are mainly used for the cross-linking process of polymers, thus the dispersion of the peroxide in a substrate material is improved, the organic peroxide is well dispersed in the substrate material and the material cross-linking is more uniform.

Description

technical field [0001] The invention relates to the field of peroxide masterbatch preparation, in particular to the preparation of organic peroxide masterbatch for polymer crosslinking, which is mainly used in the crosslinking reaction of polymers, so that peroxide can be more uniformly dispersed in base polymer resin. Background technique [0002] Organic peroxides are widely used in daily life. Due to their strong oxidizing properties, they can be used as fungicides, disinfectants and bleaching agents. It also plays an important role in polymers, such as polymer cross-linking reactions, polymer grafting reactions, etc., so the application of organic peroxides has received more and more attention. However, due to the relatively low melting point of the organic peroxide, during the mixing process of the polymer, due to the high processing temperature or the heat generated by friction, the organic peroxide will melt in advance and become a liquid and be easily lost. In orde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/00C08L23/08C08L23/16C08K5/14C08L83/04
Inventor 唐舫成张阳阳杜壮汪加胜
Owner GUANGZHOU LUSHAN NEW MATERIALS
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