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

Pending Publication Date: 2020-08-14
合肥三联塑胶有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For example, rubber itself has good cushioning and heat insulation properties, but when it is used as a PPR pipe coating material, due to the large temperature difference between the inner fluid and the external environment, i

Method used

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  • Preparation method of energy-saving thermal-insulation foamed rubber for PPR pipe

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] 1) Weigh 3g of triblock copolymer polyoxyethylene-polyoxypropylene-polyoxyethylene and add it to the 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 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 minutes, and then seal the sol in an oven for gelation, the temperature of the oven is 40℃, and the gelation time is 9h ;

[0034] 4) The resultant in step 3 is composed of gel and liquid. Pour out the liquid, then add absolute ethanol until the gel is submerged, and seal it in an oven at 40°C for aging;

[0035] 5) Repeat step 4 5 times to obtain wet gel A after the replacement of absolute ethanol;

Example Embodiment

[0036] Example 2

[0037] 1) Weigh 7g of phase separator and add it to a strong acid solution with a concentration of 0.05mol·L-1, and stir until the phase separator 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 minutes, and then seal the sol in an oven for gelation, the temperature of the oven is 40℃, and the gelation time is 9h ;

[0040] 4) The resultant in step 3 is composed of gel and liquid. Pour out the liquid, then add absolute ethanol until the gel is submerged, and seal it in an oven at 40°C for aging;

[0041] 5) Repeat step 4 5 times to obtain wet gel B after the replacement of absolute ethanol;

Example Embodiment

[0042] Example 3

[0043] A preparation method of energy-saving and heat-insulating foamed rubber, which 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 energy-saving thermal insulation foamed rubber is:

[0046] 1) Mix the rubber compound, wet gel, foaming agent, foaming aid and vulcanizing agent to obtain a premix after mixing in an internal mixer, and the mixing temperature is 60°C;

[0047] 7) Put the premix 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 pre-foamed glue;

[0048] 8) The pre-foamed rubber obtained in step 7 is made into a semi-finished product, and the single side of the semi-finished product is closely attached to the surface of the dense pallet, and the semi-f...

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Abstract

The invention discloses a preparation method of energy-saving thermal-insulation foamed rubber for a PPR pipe. The energy-saving thermal-insulation foamed rubber for the PPR pipe is prepared from thefollowing raw materials in parts by weight: 150 to 250 parts of a rubber compound, 15 to 50 parts of wet gel, 5 to 10 parts of a foaming agent, 0.1 to 1 part of a foaming aid and 0.1 to 10 parts of avulcanizing agent. A finished product is obtained through the steps of pre-mixing, wet gel preparation, hydrolysis, aging, mixing, vulcanization, pre-foaming, vulcanization and the like. According tothe invention, the heat insulation efficiency of the rubber is improved, and the product has high strength. According to the present invention, the components on the two sides of the semi-finished product are at different temperatures within a short time by using the thermal insulation property and the high heating rate of the rubber so as to inhibit the single-side foaming and improve the overallstrength of the product, and the aerogel is adopted as a bubble filler. The aerogel with lower thermal conductivity is adopted, so that the overall thermal insulation performance of the product can be effectively improved. Compared with common foamed rubber, the wear-resistant foamed rubber disclosed by the invention also has higher wear resistance.

Description

technical field [0001] The invention belongs to the technical field of rubber, and in particular relates to a preparation method of energy-saving and heat-preserving foamed rubber for PPR pipes. Background technique [0002] Rubber (Rubber) refers to a highly elastic polymer material with reversible deformation. It is elastic at room temperature, can produce large deformation under a small external force, and can return to its original shape after the external force is removed. Rubber is a completely amorphous polymer, its glass transition temperature (Tg) is low, and its molecular weight is often large, greater than hundreds of thousands. [0003] Rubber is divided into two kinds of natural rubber and synthetic rubber. Natural rubber is made by extracting gum from rubber trees, rubber grass and other plants; synthetic rubber is obtained by polymerization of various monomers. Rubber products are widely used in all aspects of industry or life. [0004] The rubber industry ...

Claims

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Application Information

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IPC IPC(8): C08L21/00C08L71/02C08K3/36C08K5/14C08J9/10
CPCC08J9/0023C08J9/0061C08J9/0066C08J9/0095C08J9/105C08J2203/04C08J2321/00C08J2471/02C08K3/36C08K5/14C08K13/02Y02P20/10
Inventor 张振宇
Owner 合肥三联塑胶有限责任公司
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