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A foaming material and formula technology, applied in the field of foaming materials and their molding, can solve the problems of high price, rough cell structure, insufficient prevention of odor or discoloration, etc.
Inactive Publication Date: 2009-08-05
JIANGSU POLYTECHNIC UNIVERSITY
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But the cross-linked rubber component contained in this elastomer cannot be foamed uniformly. That is, uniform foaming occurs only in the crystalline polyolefin part, resulting in a rough cell structure. In addition, the gas escapes from the surface of the foamed material, It makes it difficult to keep the outer surface flat, resulting in poor appearance. In addition, this elastomer cannot sufficiently prevent odor or discoloration, and involves many problems to be solved such as complicated manufacturing process, high price of available cross-linking agents, and Limited use due to contamination of the compound and the like used. On the other hand, olefinic non-crosslinked thermoplastic elastomers can be foamed uniformly by melting, but the resulting foam has a high compression permanent due to the absence of crosslinks. strain
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Embodiment 1
[0017] 1. Refining of high-temperature rubber compound: weigh materials according to the following formula, EPDM: 16.5Kg, chlorinated polyethylene (CPE): 4.5Kg, naphthene: 2.0Kg, ethylene glycol : 0.24Kg, paraffin: 0.15Kg, zinc diethyldithiocarbamate (promoting ZDC): 0.10Kg, zinc dibutyldithiocarbamate (promoting BZ): 0.10Kg, zinc stearate 0.03Kg, Barium stearate: 0.05Kg, stearic acid: 0.24Kg. Put the above materials into the internal mixer as a whole, mix to 115°C and then discharge the glue. Such as the simple mixing process figure 1 shown. Then adjust the roller distance of the open mill to 0.2mm to make triangular bags for 3 to 4 times, and then adjust the roller distance to 3.0mm to produce sheets of 50×100cm. Finally, the mixing sheets are stacked and stored according to 15Kg per weighing.
[0018] 2. Refining of low-temperature rubber compound: weigh materials according to the following formula, high-temperature rubber: 15Kg, chlorinated paraffin: 7.0Kg, talcum powd...
Embodiment 2
[0034] 1. The formula of high temperature glue is as follows: EPDM: 16.5Kg, chlorinated polyethylene (CPE): 4.5Kg, naphthene: 2.0Kg, ethylene glycol: 0.20Kg, paraffin: 0.18Kg, two Zinc ethyl dithiocarbamate (promoting ZDC): 0.15Kg, zinc dibutyldithiocarbamate (promoting BZ): 0.12Kg, zinc stearate 0.03Kg, barium stearate: 0.02Kg, stearin Acid: 0.30Kg. The mixing process of high-temperature glue is as in Example 1. 2. The formula of low-temperature compounded glue High-temperature glue: high-temperature glue: 15Kg, chlorinated paraffin: 7.0Kg, talcum powder: 2.0Kg, aluminum hydroxide: 6.0Kg, trioxide Antimony: 2.0Kg, non-polluting high stretch semi-reinforcing carbon black (N774): 2.0Kg, azodicarbonamide (foaming agent AC): 2.5Kg, urea foaming agent (DAK) 0.23Kg , 2-mercaptobenzothiazole (accelerator M): 0.20Kg, zinc oxide: 1.5Kg, sulfur: 0.10Kg, zinc dibutyldithiocarbamate (accelerator BZ): 0.20Kg, tetrathio Bis(1,5-pentylidene)thiuram (promoter DPTT): 0.26Kg. The mixing pro...
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Abstract
The invention relates to a foaming material and a molding method thereof, in particular to an ethylene propylene diene monomer (EPDM) and chlorinated polyethylene (CPE) foaming material and a molding method thereof. The material is prepared in the following steps that: firstly, high-temperature mixed rubber containing ethylene propylene diene monomer (EPDM) and chlorinated polyethylene (CPE) is mixed in an internal mixer according to a formula; after piece output and placing, high-temperature mixed rubber is mixed into low-temperature rubber according to a mixture radio; after the low-temperature rubber is cut into pieces, foaming is extruded on an extruding machine; and secondary sulfuration and shaping are carried out in a drying tunnel after the extruding so as to manufacture the foaming material. The invention has the characteristics of favorable season durability, temperature durability, aging durability, damping seal, and the like, and can be applied to the fields of heat insulation of a central air conditioner and a pipeline of a refrigeration set, buffer pad, sound absorption, voice reduction, and the like.
Description
technical field [0001] The present invention relates to a kind of foaming material and its molding method, especially relate to ternary isopropyl rubber (EPDM) and chlorinated polyethylene (CPE) and foaming material and its molding method, can be used for cushioning material, airtight and waterproof And other sealing materials. Thermal insulation materials, sound insulation and damping shock absorption materials. technical background [0002] Molded foam materials are widely used as automobile weather strips and cushioning materials against shock and noise generated by home appliances or information equipment. [0003] The conventional polyolefin foam production process involves melting the polyolefin and optional additives in an extruder, adding a physical blowing agent such as an inert gas or inert liquid to the extruder at high pressure The molten material is then extruded through an extruder die, whereby the material expands to form a foam under low pressure conditions ...
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