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Polyurethane geotextile composite liner with improved water resistance and process for production thereof

A technology for geotextiles and composite materials, which is applied in the field of producing polyurethane geotextile composite materials with improved water resistance, can solve the problems of reduced strength and water resistance of composite materials, and achieve the effects of small foaming tendency and low water absorption.

Inactive Publication Date: 2004-05-12
BAYER POLYMERS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Foaming reduces strength and water resistance of composites

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-2

[0106] The polyurethane castings of Examples 1 and 2 were prepared according to the following procedure:

[0107] The polyol blends indicated in Table 1 and Isocyanate A, in the amounts indicated in Table 1, were mixed by hand at 25-30°C for approximately 2 minutes, then poured into book-case molds at room temperature , which is 8 inches by 16 inches by 0.125 inches. The cast specimens were cured at room temperature for 16 hours before demolding. The samples were stored at room temperature in a temperature and humidity controlled environment for at least 1 week and then tested for various physical and mechanical properties. The results of these experiments are listed in Table 1.

[0108] Table 1

[0109] Example 1*

Example 2

Polyol Blend A (grams)

100

Polyol Blend B (grams)

100

Isocyanate A (g)

46.5

45.2

Gel time (min)

10

10

Index (NCO / OH×100)

105

105

Tensile strength (p...

Embodiment 3-5

[0112] Embodiment 3-5 (comparison)

[0113] Polyurethane geotextile composites were prepared according to the following procedure:

[0114] 100 grams of Polyol Blend A and 42.6 grams of Isocyanate A were mixed and poured onto a 1 square foot piece of Geotextile A. The polyurethane-forming reaction mixture was spread with a spatula, and one square foot of the second geotextile (A, B, or C) was placed on top of the liquid polyurethane. A squeegee roller was then rolled over the second geotextile to evenly distribute the polyurethane mixture between the geotextiles while rolling out any excess polyurethane. In about 1 hour, the material cured into a solid geotextile polyurethane composite. The amount of resin in the composite is typically about 200 g / square foot and the thickness of the composite ranges from 40 to 100 mils. All samples prepared under high humidity conditions (>70%) showed significant foaming prior to curing to form a solid polyurethane geotextile composite. T...

Embodiment 6-8

[0118] Polyurethane geotextile composites were prepared according to the following procedure:

[0119] 100 grams of Polyol Blend B and 46 grams of Isocyanate A were mixed and poured onto a 1 square foot piece of Geotextile A. The polyurethane-forming reaction mixture was spread with a spatula, and one square foot of the second geotextile (A, B, or C) was placed on top of the liquid polyurethane. A squeegee roller was then rolled over the second geotextile to evenly distribute the polyurethane mixture between the geotextiles while rolling out any excess polyurethane. In about 1 hour, the material cured into a solid geotextile polyurethane composite. The amount of resin in the composite is typically about 200 g / square foot and the thickness of the composite ranges from 40 to 100 mils. All samples were prepared under high humidity conditions (>70%) and showed no evidence of foaming. The physical properties of each of these composites prepared according to the present invention...

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Abstract

A water-resistant polyurethane geotextile composite suitable for use as a liner is made by impregnating a geotextile with a water-resistant polyurethane and allowing the polyurethane impregnated in the geotextile to cure. The water-resistant polyurethane composition is a reaction product of (a) a liquid polyisocyanate having an isocyanate content of at least 10 % by weight, (b) an isocyanate having an isocyanate content of at least 10 % by weight, (b) an isocyanate-reactive component which includes (1) 20-90 % by weight castor oil having a water content of less than 0.5 % by weight, and (2) a polyether polyol in which at least 70 % by weight of the alkylene oxide is propylene oxide, and (c) a urethane catalyst. Low molecular weight diols and triols and filters may optionally be included.

Description

technical field [0001] The present invention relates to polyurethane geotextile composites with improved water resistance. Additionally, the present invention relates to methods of producing polyurethane geotextile composites with improved water resistance. Background technique [0002] In recent years, the management of natural resources has become increasingly important in many countries of the world. Efforts have been made to conserve resources and eliminate environmental pollution. It is especially important to prevent dirt seepage and moisture loss. [0003] Losses in water distribution using unlined irrigation channels are estimated to be at least 25% and in some cases greater than 50% depending on the porosity of the channel surface and the distance the water travels. In most rural areas, ditches are formed by digging the soil to a predetermined depth and width. Water travels through the trench in contact with exposed natural surfaces. It may be sand, clay, rock,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66
CPCC08G2190/00C08G18/6696
Inventor P·H·马库施A·M·萨佩斯卡M·唐纳森T·W·埃斯塔布罗克三世R·格特尔
Owner BAYER POLYMERS LLC
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