Unlock instant, AI-driven research and patent intelligence for your innovation.

Synthetic polyurethane elastomers based on soft segment prepolymers and non-mercury catalysts for subsea pipeline insulation

A composite polyurethane, non-mercury catalyst technology, applied in polyurea/polyurethane coatings, pipeline protection through thermal insulation, pipeline protection, etc., can solve the problems of exposure of the underlying substrate, loss of thermal insulation efficiency, etc.

Inactive Publication Date: 2018-12-14
DOW GLOBAL TECH LLC
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in a loss of insulation efficiency and can expose the underlying substrate to the corrosive effects of seawater

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Synthetic polyurethane elastomers based on soft segment prepolymers and non-mercury catalysts for subsea pipeline insulation
  • Synthetic polyurethane elastomers based on soft segment prepolymers and non-mercury catalysts for subsea pipeline insulation
  • Synthetic polyurethane elastomers based on soft segment prepolymers and non-mercury catalysts for subsea pipeline insulation

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0073] Example 1 and Comparative Samples A and B

[0074] Polyol A is a nominally trifunctional polyether made by adding propylene oxide to a trifunctional initiator followed by ethylene oxide. Polyol A contains about 15% by weight ethylene oxide. It contains mainly primary hydroxyl groups and has a hydroxyl equivalent weight of about 2050.

[0075] The Zn / Zr catalyst is a mixture of zinc carboxylate and zirconium carboxylate, wherein the weight ratio of zinc to zirconium is 99-99.5:0.5-1. Catalysts contain some species with M-O-M bonds, where M represents a metal, ie Zn or Zr.

[0076] The microspheres are 3M grade S38HS glass microspheres.

[0077] Polyisocyanate A is a modified MDI with an isocyanate equivalent weight of 160 g / mol and an isocyanate functionality of about 2.

[0078] Polyurethane Elastomer Example 1 was produced by reacting 62.5 g of Polyol A with 45.5 g of Polyisocyanate A under nitrogen until the isocyanate content was reduced to about 8% by weight. G...

specific Embodiment

[0084] Specific embodiment: in specific embodiment, the present invention is:

[0085] 1. A cured syntactic polyurethane elastomer comprising an alkanediol chain extender, microspheres ranging from 5% to 50% by weight of the reaction mixture, and an isocyanate content of 3% to 12% by weight The reaction product of a reaction mixture of an isocyanate-terminated prepolymer and a non-mercury catalyst, wherein (i) said prepolymer is a mixture of at least one polyether polyol having an average hydroxyl equivalent weight of at least 800 with an excess of aromatic polyisocyanate The reaction product, (ii) the amount of prepolymer provided to the reaction mixture is sufficient to provide an isocyanate index of 80 to 130, and (iii) the reaction mixture is substantially free of mercury compounds.

[0086] 2. The preceding embodiment, wherein the cured composite elastomer comprises a polyurethane matrix with microspheres embedded therein.

[0087] 3. Any preceding embodiment, wherein th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

Use of non-mercury catalysts to create syntactic polyurethane elastomers. The elastomer is made from a reaction mixture containing a prepolymer made from polyether polyol and polyisocyanate, a chain extender, polyisocyanate, and microspheres. Elastomers adhere well to themselves, making them ideal for use as thermal insulation for pipelines and other structures with complex geometries.

Description

technical field [0001] The invention relates to a composite polyurethane elastomer, which is suitable for use as heat insulation materials for submarine pipelines and buildings. Background technique [0002] Subsea pipelines are used worldwide to transport oil and / or natural gas from subsea wellhead collection facilities on the ocean surface. Cooler sea temperatures can cause solid wax and hydrates to form as production fluids are pumped to the surface. This problem is ameliorated by applying insulation to the outside of the pipe. [0003] Rigid polyurethane foams are widely used as thermal insulation materials. These foams are generally produced by reacting polyisocyanates with curing agents in the presence of a blowing gas. The blowing gas is trapped in the cells of the foam. Trapped gas is largely responsible for the insulating properties of foam. Polyurethane insulating foam is a rigid material in most applications. However, highly rigid polyurethanes are not suita...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/48C08G18/76C08G18/10C08G18/22C08G18/32C08K7/28C08L75/04C08J9/32
CPCC08G18/4841C08G18/7657C08G18/10C08G18/222C08G18/3206C08K7/28C08L75/04C08J2375/04C08J9/32B05D3/007B05D7/52C08G18/66C08G18/7671C09D175/08F16L59/14C08J2375/08
Inventor M·Y·格尔佛尔A·斯蒂芬逊M·布朗
Owner DOW GLOBAL TECH LLC