Crosslinked polyethylene special material for rotational moulding
A technology of cross-linked polyethylene and special materials, applied in the field of cross-linked polyethylene special materials for rotational molding, can solve the problem of limiting the application range of LLDPE, poor processability of LLDPE, thermal creep, low temperature impact resistance and swelling resistance. and other problems, to achieve the effect of good rotomolding performance, good permeability and chemical resistance, and good fluidity
Inactive Publication Date: 2004-08-25
PETROCHINA CO LTD
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Problems solved by technology
However, LLDPE still has defects such as poor processability, thermal creep resistance, low temperature impact resistance, and swelling resistance, which undoubtedly limit the application range of LLDPE.
Method used
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Examples
Experimental program
Comparison scheme
Effect test
example 1
[0018] formula:
[0019] LLDPE 7042 70 kg
[0020] LDPE 1F7A 30 kg
[0021] Dicumyl peroxide 4.5kg
[0022] Antioxidant 1010 500g
[0023] Preparation: Mix the raw materials prepared according to the formula evenly in a high-speed mixer, and then blend on a double-roll mill, and the blending temperature is 130-140°C. The next piece was crushed.
example 2
[0025] formula:
[0026] LLDPE 7042 90 kg
[0027] LDPE 1F7A 10 kg
[0028] 2,5 dimethyl-2,5 di-tert-butyl hexane 1 kg
[0029] Dilauryl Thiodipropionate 900g
[0030] Preparation: The method is the same as the preparation method of Example 1.
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The present invention relates to a rotational moulding cross-linked polyethylene special-purpose material. It contains the following components: (by total weight of linear low-density polyethylene and low-density polyethylene) A. linear low-density polyethylene 70-90%; B. low-density polyethylene 10-30%; C. cross-linking agent 0.5-5%; and D. antioxidant 0.1-1%. Said invention also relates to a preparation method for using said special-purpose material. The special-purpose material composition can be molten and mixed in a mixer or twin screw extruder machine, blending temp. is 130-170 deg.C, the invented polyethylene special-purpose material can be obtained. The rotational moulding product prepared by said special-purpose material has good working property, high resistance to implact shock, good resistance to thermal creep and low-temp. toughness, etc.
Description
technical field [0001] The invention relates to a special cross-linked polyethylene material for rotational molding. Background technique [0002] Rotational molding is one of the methods of forming large and medium-sized products. This process originated in the United States in the 1940s. Due to various reasons, it has developed slowly and is limited to the processing of a few plastic products. In recent years, due to the development of plastics and their powdering, the gradual expansion of the application field of plastics, and the superiority of this process, it is developing rapidly. At present, the proportion of various types of rotationally molded polyethylene materials in foreign countries is roughly: 65% for linear low-density polyethylene (LLDPE), 20% for cross-linked polyethylene (XHDPE), 10% for high-density polyethylene (HDPE), and 10% for low-density polyethylene (LDPE). Polyethylene (LDPE) is 5%. In the late 1970s, linear low-density ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B29C48/40C08L23/06
CPCB29C48/40
Inventor 王洪梅陈光岩
Owner PETROCHINA CO LTD
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