Preparation method of energy-saving thermal-insulation foamed rubber for PPR pipe
A technology of foam rubber and heat preservation, applied in the field of rubber, can solve the problems of high thermal conductivity, heat loss, low tensile strength, etc., achieve high wear resistance, increase heat insulation efficiency, and improve the effect of overall heat insulation performance
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Embodiment 1
[0031] 1) Weigh 3g of the triblock copolymer polyoxyethylene-polyoxypropylene-polyoxyethylene and add it to a hydrochloric acid solution with a concentration of 0.001mol L-1, and stir until the triblock copolymer polyoxyethylene-polyoxypropylene - polyoxyethylene is completely dissolved;
[0032] 2) Add 2 mL of methyl orthosilicate to the solution obtained in step 1, and stir for 4 hours until the methyl orthosilicate is completely hydrolyzed;
[0033] 3) Add 2 mL of accelerator to the solution obtained in step 2 at a dropping rate of 0.2 mL·min-1, stir for 25 min, then seal the sol and place it in an oven for gelation. The temperature of the oven is 40°C, and the gelation time is 9 hours. ;
[0034] 4) The product obtained in step 3 is composed of gel and liquid, pour out the liquid, then add absolute ethanol until the gel is submerged, seal it and place it in an oven at 40°C for aging;
[0035] 5) Repeat step 4 5 times to obtain wet gel A after replacement of absolute etha...
Embodiment 2
[0037] 1) Weigh 7 g of the phase separation agent and add it to a strong acid solution with a concentration of 0.05 mol L-1, and stir until the phase separation agent is completely dissolved;
[0038] 2) Add 2 mL of the precursor silicon source to the solution obtained in step 1, and stir for 4 hours until the precursor silicon source is completely hydrolyzed;
[0039] 3) Add 2 mL of accelerator to the solution obtained in step 2 at a dropping rate of 0.2 mL·min-1, stir for 25 min, then seal the sol and place it in an oven for gelation. The temperature of the oven is 40°C, and the gelation time is 9 hours. ;
[0040] 4) The product obtained in step 3 is composed of gel and liquid, pour out the liquid, then add absolute ethanol until the gel is submerged, seal it and place it in an oven at 40°C for aging;
[0041] 5) Repeat step 4 5 times to obtain the wet gel B replaced by absolute ethanol;
Embodiment 3
[0043] A method for preparing energy-saving and heat-preserving foamed rubber. The energy-saving and heat-preserving foamed rubber is calculated in parts by weight, and includes the following raw materials:
[0044] 150 parts of rubber compound, 15 parts of wet gel A, 5 parts of foaming agent, 0.1 part of foaming aid and 0.1 part of vulcanizing agent.
[0045] The preparation method of the energy-saving and heat-preserving foamed rubber is as follows:
[0046] 1) After mixing the rubber compound, wet gel, foaming agent, foaming aid and vulcanizing agent, the premix is obtained after mixing in an internal mixer, and the mixing temperature is 60°C;
[0047] 7) Put the premixed material obtained in step 6 into an electrothermal constant temperature blast drying oven and freely foam at a temperature of 150° C. for 3 minutes to obtain a prefoamed rubber;
[0048] 8) Make the pre-foamed rubber obtained in step 7 into a semi-finished product, make one side of the semi-finished pro...
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