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Polyurethane foam material having skin-core structure, and preparation method thereof, and sealing material

A technology of polyurethane foam and skin-core structure, applied in the direction of coating, etc., can solve problems such as migration of additives, sealing failure, etc., and achieve the effect of good mechanical properties

Active Publication Date: 2019-08-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the material is in direct contact with the outer layer of nitrile rubber. Due to the porous structure of polyurethane foam, it is easy to cause the migration of additives in the nitrile rubber, and there is a hidden danger of seal failure.

Method used

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  • Polyurethane foam material having skin-core structure, and preparation method thereof, and sealing material
  • Polyurethane foam material having skin-core structure, and preparation method thereof, and sealing material
  • Polyurethane foam material having skin-core structure, and preparation method thereof, and sealing material

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preparation example Construction

[0024] The second aspect of the present invention provides a method for preparing a polyurethane foam material with a skin-core structure. The method includes: coating a solution containing silicone rubber on the polyurethane foam, and then performing drying and curing treatments; The core foam formed by foam and the polyurethane foam material of the surface layer foam formed by silicone rubber modified polyurethane foam.

[0025] According to the present invention, the silicone rubber and polyurethane foam are as described above, and the present invention will not be repeated here.

[0026] According to the present invention, the concentration of the solution containing the silicone rubber can be varied within a wide range. Preferably, the concentration of the solution containing the silicone rubber is 15-60% by weight, preferably 20-50% by weight, It is more preferably 30-40% by weight, especially by controlling the viscosity of the silicone rubber-containing solution to 2000-100...

Embodiment 1

[0045] This embodiment is used to illustrate the polyurethane foam material with a skin-core structure and its preparation method and sealing material of the present invention.

[0046] (1) Dissolve polydimethylsiloxane in xylene and pass a 100 mesh filter to obtain a silicone rubber solution with a polydimethylsiloxane content of 30% by weight (viscosity 350cp); Method (spraying pressure 0.35-0.40MPa, spraying distance is about 150mm) spray the silicone rubber solution on the surface of cylindrical polyurethane foam (outer diameter 20cm, apparent density 35g / cm 3 , See the SEM image of the surface figure 2 ), after spraying (the infiltration depth of the silicone rubber solution is about 10mm), place it in a vacuum oven at 80℃ for 3min, take it out and cure for 24h at a relative humidity of 35% and a temperature of 20℃ to obtain a polyurethane foam with a skin-core structure Material P1, its outer diameter is 20cm, apparent density is 45g / cm 3 , The thickness ratio of the surfac...

Embodiment 2

[0050] This embodiment is used to illustrate the polyurethane foam material of the skin-core structure of the present invention, its preparation method and sealing material.

[0051] (1) Dissolve polydimethylsiloxane in ethyl acetate and pass a 100-mesh filter to obtain a silicone rubber solution with a polydimethylsiloxane content of 40% by weight (viscosity 420cp); spin spraying Method (spraying pressure 0.35-0.40MPa, spraying distance is about 180mm) spray the silicone rubber solution on the surface of cylindrical polyurethane foam (outer diameter is 18cm, apparent density 40g / cm 3 ), after spraying (the infiltration depth of the silicone rubber solution is about 15mm), dry it in a vacuum oven at 100℃ for 5min, take it out and cure it for 30h at a relative humidity of 40% and a temperature of 25℃ to obtain a polyurethane foam with a skin-core structure Material P2, its outer diameter is 18cm, apparent density is 53g / cm 3 , The thickness ratio of the surface layer foam and the c...

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Abstract

The present invention relates to the field of sealing materials, particularly to a polyurethane foam material having a skin-core structure, and a preparation method thereof, and a sealing material, wherein the polyurethane foam material comprises core foam formed by polyurethane foam and surface layer foam formed by organosilicon rubber modified polyurethane foam. According to the present invention, the polyurethane foam material having the skin-core structure has good mechanical properties, and can effectively prevent the auxiliary agent in the nitrile rubber from migrating out so as to provide the high sealing effect for a long time when the polyurethane foam material and the nitrile rubber are matched to form a sealing material.

Description

Technical field [0001] The invention relates to the field of sealing materials, in particular to a polyurethane foam material with a skin-core structure, a preparation method thereof, and a sealing material. Background technique [0002] At present, my country's crude oil reserve construction is developing rapidly. A national crude oil reserve base and a large number of commercial reserve bases have been established. The key component of the base is floating-roof crude oil storage tanks. If the storage tank fails to seal, it is prone to fire accidents under the action of lightning, and the oil storage tank is damaged by lightning strikes from time to time, which not only threatens the safe operation of the storage tank but also causes huge property losses to the enterprise and the country. [0003] The necessary condition for storage tanks to cause a fire is that where there is a mixture of oil and gas and air, there are lightning sparks or electrical sparks. An important way to i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08L83/04C08L83/05C08L9/02C08J9/36
CPCC08J9/365C08J9/36C08J2375/04C08J2483/04C08J2483/05C08J2409/02
Inventor 唐功庆解希铭王丽丽王丽静赵青松
Owner CHINA PETROLEUM & CHEM CORP
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