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Polyurethane elastomer composition and preparation method thereof

A polyurethane elastomer, polyurethane prepolymer technology, applied in mechanical equipment, fluid flow and other directions, can solve problems such as poor wear resistance, easy to be punctured, and reduced vibration suppression efficiency.

Active Publication Date: 2010-12-29
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Materials for making spiral strakes include rubber, polyethylene, glass fiber reinforced resin and other materials, but their wear resistance is poor, and they are easy to be punctured during installation, which will lead to a decrease in vibration suppression efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Take 100 parts of polyoxypropylene diol with a relative molecular mass of 2000, and 50.6 parts of diphenylmethane diisocyanate (MDI), and react at 80±2°C for 3.0 hours to obtain a polyurethane prepolymer with a relative molecular mass of 5000 .

[0028] 2) Take 12 parts of the chain extender 1,4-butanediol (1,4-BDO) and 0.01 part of the catalyst dibutyltin dilaurate and mix them uniformly to obtain a curing agent.

[0029] 3) 100 parts of the obtained polyurethane prepolymer prepared according to step 1) and 8.1 parts of the obtained curing agent prepared in step 2) (the molar ratio of -NCO group in the prepolymer to the group-OH containing active hydrogen in the curing agent is 1.1: 1) mixed uniformly at 70°C, decompressed (vacuum degree of 100Pa, decompression time of 1 minute) defoamed and poured into a mold, vulcanized at 60°C for 20 hours to obtain the polyurethane elastomer provided by the invention.

[0030] According to GB / T528-1998, GB / T531-2008, GB / T529-1999...

Embodiment 2

[0032] 1) Take 100 parts of polyoxypropylene triol with a relative molecular mass of 3000 and 19 parts of toluene diisocyanate (TDI), and react at 75±2°C for 3.5 hours to obtain a polyurethane prepolymer with a relative molecular mass of 6000.

[0033] 2) Take 11 parts of chain extender 3,5-dimethylthiotoluenediamine (model is Ethacure 300, purchased from Albemarle Company, USA) as curing agent.

[0034] 3) 100 parts of the polyurethane prepolymer prepared according to step 1) and 9.2 parts of the curing agent prepared in step 2) (the -NCO group in the prepolymer and the group -NH containing active hydrogen in the curing agent 2 The molar ratio is 1.2:1) at 55 DEG C and mixed uniformly, decompressed (vacuum degree is 50 Pa, decompression time is 2 minutes) defoaming and poured in the mold, 100 DEG C of vulcanization 12 hours, obtains the polyurethane provided by the present invention elastomer.

[0035] According to GB / T528-1998, GB / T531-2008 and GB / T529-1999, the performance...

Embodiment 3

[0037] 1) Take 100 parts of polyoxytetramethylene glycol with a relative molecular weight of 2000, and 35 parts of isophorone diisocyanate, and react at 90±2°C for 2.5 hours to obtain a polyurethane prepolymer with a relative molecular weight of 3500.

[0038] 2) Take 15 parts of chain extender 3,5-dimethylthiotoluenediamine (model is Ethacure 300, purchased from Albemarle, USA), 4 parts of chain extender 1,6-hexanediol and 0.2 parts of catalyst bismuth carboxylate Parts are mixed evenly to obtain a curing agent.

[0039] 3) 100 parts of the obtained polyurethane prepolymer prepared according to step 1) and 14 parts of the obtained curing agent prepared in step 2) (the -NCO group in the prepolymer and the group -OH and -NH containing active hydrogen in the curing agent 2 The molar ratio of the sum of the molar amounts is 1.02:1) mixed uniformly at 75°C, decompressed (the vacuum degree is 300Pa, and the decompression time is 3 minutes) and poured into the mold after defoaming, ...

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Abstract

The invention discloses a polyurethane elastomer and a preparation method thereof. The method comprises the following steps: evenly mixing polyurethane prepolymer with curing agent, removing foam, casting and curing to obtain the polyurethane elastomer, wherein the curing agent is composed of at least one of chain extender and cross-linking agent, catalyst and other additives. The Shaw hardness Aof the polyurethane elastomer prepared by the invention is 70-90A, the tensile strength thereof is not less than 14MPa, and the elongation at break thereof is not less than 360%; and the polyurethaneelastomer can resist hydrolysis, meets performance requirements for the spiral strake material in the deep-sea riser vortex-excited oscillation suppression device, and has important application value.

Description

technical field [0001] The invention relates to a polyurethane elastomer composition and a preparation method thereof. Background technique [0002] The riser is an essential part of offshore oil and gas exploitation, and it undertakes important functions such as oil transportation, oil production, drilling, and water injection. When the sea current flows through the standpipe at a certain velocity, a pair of fixed and symmetrical vortices can be alternately formed on both sides of the standpipe, and the periodic resistance caused by the vortex can make the cylinder vibrate in the direction of the incoming flow, that is, the so-called in-line vortex. (in-line) vibration or longitudinal vibration; as the flow rate increases, strong vortices can be formed alternately on both sides of the standpipe, and the vortex shedding will produce a periodic variable force on the standpipe, making the standpipe in the same direction as the flow direction Horizontal vibration (cross-flow) ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08L75/08F15D1/00
Inventor 邹明清贾旭张晓灵徐阳杨加栋许亮斌杜宝银矫滨田蒋晓斌沙勇相政乐庞坤玮黎艳飞
Owner CHINA NAT OFFSHORE OIL CORP
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