High polymer composite material manhole lid and its production method
A composite material and polymer technology, applied in the field of polymer composite material manhole cover and its manufacturing, can solve the problems of high market price of hard rubber and heavy calcium powder, the bearing capacity cannot meet the requirements, and the production cost of the manhole cover is affected. The effect of high strength, improved bearing capacity, and high thermal stability
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[0037] Example 1:
[0038] 1. Material preparation:
[0039] At room temperature, pour 45%~70% coal ash and 5%~15% polymer unsaturated resin into the mixer, stir for 3~6 minutes, add 15%~30% fiber, and stir together for 1~4 minute. Then add a mixture of curing agent, defoamer, reinforcing agent, zinc stearate and pigment, and stir for 2 to 5 minutes to fully mix the raw materials.
[0040] 2. Packing:
[0041] First smear or evenly spray the release agent on the mold, pour 30% to 60% of the raw material mixture into the mold cavity, put on the T-shaped steel frame, and then pour the remaining raw material mixture.
[0042] 3. Compression molding:
[0043] After all the raw material mixture has been added to the mold cavity, close the mold, control the pressure within the range of 200-300 tons, and the temperature within the range of 100-150°C. After holding for 8-15 minutes, open the mold and eject it.
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[0044] Example 2:
[0045] 1. Material preparation: Pour 60% coal ash and 15% polymer unsaturated resin into the mixer at room temperature. After stirring for 4 minutes, add 15% fiber and stir together for 3 minutes. Then add a mixture of curing agent, defoamer, enhancer, zinc stearate and pigment, and stir for 4 minutes to mix the raw materials thoroughly.
[0046] 2. Packing:
[0047] First smear or evenly spray the release agent on the mold, pour 45% of the raw material mixture into the mold cavity, put on the T-shaped steel frame, and then pour the remaining raw material mixture.
[0048] 3. Compression molding:
[0049] After all the raw material mixture has been added to the mold cavity, close the mold, control the pressure at 200 tons, control the temperature at 120°C, hold for 10 minutes, open the mold, and eject.
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