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Preparation method for chlorinated polyethylene rubber

A technology of chlorinated polyethylene and high-density polyethylene, applied in the field of preparation of chlorinated polyethylene rubber, can solve problems such as preparation process improvement, achieve stable product performance, avoid damage, and improve processing safety

Active Publication Date: 2014-12-10
江苏科利新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process does not improve the preparation process of chlorinated polyethylene for the vulcanization system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: The preparation method of the chlorinated polyethylene rubber described in the present embodiment, its steps are:

[0031]a. Add 4500kg water, 5kg organic dispersant sodium polymethacrylate, 10kg inorganic dispersant talcum powder, 0.5kg emulsifier sodium dodecylbenzenesulfonate, 1.1kg peroxide initiator in 6300 liters of reactor For benzoyl oxidation, add 540kg of powdered high-density polyethylene under stirring until the powder is basically suspended in water; the high-density polyethylene melt index MI (190°C, 5kg) = 0.5-1.5g / 10min, MWD =10-15;

[0032] b. Heat to make the temperature of the material reach 72°C, seal the reactor and feed chlorine gas for reaction, the total chlorine flow is 600kg; the reaction temperature is 70-130°C, the pressure in the reactor is ≤0.5MPa, and the reaction time is 3.5 hours; after the reaction Cooling, get rid of excess chlorine in the upper part of the reactor;

[0033] c. Transport the material to a closed stirrin...

Embodiment 2

[0034] Example 2: The preparation method of the chlorinated polyethylene rubber described in the present embodiment, its steps are:

[0035] a. Add 20000kg water, 25kg organic dispersant polyvinyl alcohol, 50kg inorganic dispersant white carbon black, 2.0kg emulsifier peroxidized castor oil, 5kg peroxide initiator tert-butyl peroxybenzoate in 25000 liters of reactor Add 2200kg of powdered high-density polyethylene to the ester under stirring until the powder is basically suspended in water; the high-density polyethylene melt index MI (190°C, 5kg) = 0.5-1.5g / 10min, MWD = 10- 15;

[0036] b. Heat to make the temperature of the material reach 75°C, seal the reactor and feed chlorine gas for reaction, the total chlorine flow is 2500kg; the reaction temperature is 70-130°C, the pressure in the reactor is ≤0.5MPa, and the reaction time is 4 hours; after the reaction Cooling, get rid of excess chlorine in the upper part of the reactor;

[0037] c. Transfer the material to a clo...

Embodiment 3

[0039] Example 3: The preparation method of the chlorinated polyethylene rubber described in the present embodiment, its steps are:

[0040] a. Add 1000kg water, 1.2kg organic dispersant sodium polymethacrylate, 2kg inorganic dispersant white carbon black, 0.02kg emulsifier oxa-fluorinated sodium phenyl sulfonate, 0.2kg peroxide to a 1500 liter reactor Thin initiator dicumyl peroxide, add 100kg of powdered high-density polyethylene under stirring state, until the powder is basically suspended in water;

[0041] b. Heat to make the temperature of the material reach 70°C, seal the reactor and feed chlorine gas for reaction, the total chlorine flow is 120kg; the reaction temperature is 70-130°C, the pressure in the reactor is ≤0.5MPa, and the reaction time is 3 hours; after the reaction Cooling, get rid of excess chlorine in the upper part of the reactor;

[0042] c. Transfer the material to a closed stirring container, wash it repeatedly with water, and then add sodium hydr...

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Abstract

The invention discloses a preparation method for chlorinated polyethylene rubber. The preparation method comprises the following steps: a, adding 100-150 parts (in parts by weight) of high-density polyethylene, 0.8-1.5 parts of an organic dispersant, 2.0-4.0 parts of an inorganic dispersant, 0.02-0.25 part of an emulsifier and 0.2-0.5 part of an peroxide initiator into water, and suspending the high-density polyethylene into water under a stirring state; b, heating the mixed materials, introducing 120-150 parts of chlorine gas to carry out a chlorination reaction, after sufficiently reacting, separating chlorine compounds from the rest of media by virtue of a filter process, adding water to repeatedly wash under the stirring condition; and c, adding a neutralizer into the chlorine compounds to neutralize, and finally, centrifuging and drying to obtain the chlorinated polyethylene rubber with chlorine content of 34-37%. By virtue of the way, the preparation method can be used for solving a technical problem that the normal chlorinated polyethylene rubber is short in scorch time in a thiadiazole vulcanization system.

Description

[0001] technical field [0002] The invention relates to chlorinated polyethylene, in particular to a preparation method of chlorinated polyethylene rubber suitable for thiadiazole vulcanization system. [0003] Background technique [0004] Chlorinated polyethylene rubber (CPE) is a polymer synthetic material with excellent comprehensive physical properties. It is a modified polymer obtained by substitution reaction of polyethylene and chlorine gas. Due to its relatively comprehensive technical properties, such as excellent flame retardancy and oil resistance, good physical and mechanical properties, good heat aging resistance, ozone resistance, weather resistance and good process mixing performance, chlorinated polyethylene rubber It can be used alone or in combination with other rubbers, and is widely used in the fields of rubber products such as waterproof membranes, wires and cables, and tapes. The industrial manufacturing methods of chlorinated polyethylene include a...

Claims

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Application Information

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IPC IPC(8): C08F8/22C08L23/28C08K5/46
Inventor 孙锦伟景伟刘毓红张新江张凯钧
Owner 江苏科利新材料有限公司
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