Polyurethane adhesive for trenchless repairing of pipelines and preparation method for polyurethane adhesive

A polyurethane adhesive and pipeline repair technology, which is applied in the directions of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., to achieve the effects of satisfying construction time, low cost of raw materials, and simple and easy synthesis process

Active Publication Date: 2013-01-16
太原市塑料研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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At present, there are no products and literature reports about this technology at home and abroad.

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  • Polyurethane adhesive for trenchless repairing of pipelines and preparation method for polyurethane adhesive
  • Polyurethane adhesive for trenchless repairing of pipelines and preparation method for polyurethane adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: the preparation method of polyurethane prepolymer:

[0034] At a temperature of 80°C, add 43g of polyether N220 and 32g of polycarbonate diol (calculated based on a molecular weight of 2000), and heat up to 130°C for 2 hours after they are completely melted (vacuum degree reaches 0.09MPa) . Then cool down the system to 75°C, add 212g of crude MDI, then raise the temperature to 80°C, react at constant temperature for 2.5 hours, and vacuumize for 0.5 hours after the reaction to obtain a prepolymer. After testing, the mass percentage of the isocyanate of the obtained prepolymer was 19.8%.

Embodiment 2

[0035] Embodiment 2: the preparation method of polyurethane prepolymer:

[0036] At a temperature of 80°C, add 64.0g of polyether N220 and 42.0g of polycarbonate diol (calculated with a molecular weight of 2000), and heat up to 135°C to vacuum for 2 hours after they are completely melted (vacuum degree reaches 0.09MPa) ). Then cool down the system to 75°C, add 275.0g of crude MDI, then raise the temperature to 80°C, and react at constant temperature for 2.5 hours. After the reaction, vacuumize for 1 hour to obtain a prepolymer. After testing, the mass percent of isocyanate in the obtained prepolymer was 20.6%.

Embodiment 3

[0037] Embodiment 3: a kind of preparation method of polyurethane adhesive for non-excavation pipeline repair:

[0038] Synthetic curing agent:

[0039] First weigh 1.15g of KH-570 silane coupling agent, hydrolyze it in 95% ethanol solution with a pH value of 4.00 for 45min until clarification, and obtain the hydrolyzate of silane coupling agent; add 0.5 g hexadecyl to 500 mL water Trimethylammonium bromide, fully emulsified, then add the hydrolyzate, stir and mix evenly, heat to 80°C, add 100 g of kaolin, stir on a stirrer at a speed of 180 rpm for 150 minutes, suction filter, and dry; 2.21 g of the modified inorganic filler and 55.15 g of polycarbonate diol were stirred for 15 min at 40° C. at a speed of 200 rpm, and then discharged.

[0040] Synthetic polyurethane prepolymer:

[0041] Add 67.1g polyether (calculated as N220) and 49.2g polycarbonate diol (calculated as molecular weight 2000) at 80°C, heat up to 130°C and vacuumize for 2.5 hours after all melted, so that the ...

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Abstract

The invention relates to a polyurethane adhesive for trenchless repairing of pipelines and a preparation method for the polyurethane adhesive, belongs to the field of adhesives for repairing of the pipelines and discloses a solvent-free polyurethane adhesive. After being cured, the polyurethane adhesive does not have any smell and is an environment-friendly product which is mainly developed in adhesive industry. The adhesive product comprises the following raw materials in percentage by weight: 69 to 75 percent of polyurethane prepolymer, 23 to 28 percent of curing agent and 2 to 3 percent of defoaming agent. A synthesis process of the product is simple and practicable; the raw materials are low in cost; and the adhesive is suitable to be produced industrially and can be applied to repairing of poly ethylene (PE) plastic pipelines, polyvinyl chloride (PVC) plastic pipelines, glass reinforced plastic (GRP) pipelines and other plastic pipelines, leakage blockage and repairing of concrete pipelines and cast-iron pipelines, and repairing of pipelines in underground wet environment or environment with water.

Description

technical field [0001] The invention relates to a polyurethane adhesive for trenchless pipeline repair and a preparation method thereof, belonging to the field of adhesives for pipeline repair. Background technique [0002] With the acceleration of urbanization in our country, the improvement of people's living standards, and the strengthening of environmental protection, the traditional excavation methods are increasingly unsuitable for the needs of modern construction forms, rather than excavation pipe laying, pipe repair and pipe replacement technology It has a series of advantages such as no impact on post-traffic, fast pipe laying speed, high efficiency, no environmental damage, and no impact on people's normal work and life, and is more and more favored by the underground pipeline construction department. In China, the development of trenchless engineering has driven the development of trenchless technology, and some trenchless equipment has been localized. However, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/08C08G18/48C08G18/44
Inventor 郭健亢小丽靳新慧武六旺李星明和涛
Owner 太原市塑料研究所
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