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Solvent-free two-component polyurethane putty for rotor wing

A two-component polyurethane, solvent-free technology, applied in the direction of filling slurry, etc., can solve the problems of unfriendly environment, insufficient cohesion, low reactivity, etc., achieve convenient construction, improve adhesion and flexibility, and good filling Effect

Active Publication Date: 2013-07-17
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Atomic putty has the advantages of fast drying, easy grinding, and strong adhesion, but its flexibility becomes poor at low temperatures, with large shrinkage and insufficient cohesion, so it is not suitable for rotors; although epoxy putty has fast drying, strong adhesion, and easy Grinding and other advantages, but its reactivity at low temperature (below 5°C) is low and toughening treatment is often required; solvent-based polyurethane putty has large shrinkage deformation due to solvent and is not environmentally friendly, which limits its use on the rotor. application

Method used

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  • Solvent-free two-component polyurethane putty for rotor wing
  • Solvent-free two-component polyurethane putty for rotor wing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1 prepares long-chain vegetable oleic acid modified polyester resin

[0017] Weigh 90 parts of adipic acid, 10 parts of phthalic anhydride, 84 parts of diethylene glycol, and 11 parts of trimethylolpropane into a four-necked flask equipped with a thermometer, an oil-water separator and a stirrer, and fill it with nitrogen for about 15 minutes. Slowly heat to about 60°C after the material melts, start the agitator and continue to heat to 150°C to start reflux dehydration, control the water outlet rate and the column top temperature of the oil-water separator within the range of 100±2°C, and control the heating rate to 10°C / h, React at 160°C-220°C for 8-12 hours until the measured acid value is less than 5mgKOH / g, add 31 parts of ricinoleic acid and react for 3 hours, then add 0.2 parts of stannous octoate as a catalyst to promote the further progress of the reaction, when the oil-water separator When the column top temperature drops below 70°C, take a sample t...

Embodiment 2

[0018] Embodiment 2 prepares self-made reactive diluent

[0019] Weigh 254 parts of caprolactone monomer, 58 parts of 1,4-butanediol, 42 parts of trimethylolpropane and 0.4 parts of catalyst tetrabutyl titanate and put them into a four-necked flask equipped with a thermometer, condenser and stirrer In the process, fill with nitrogen to protect for about 15 minutes, heat slowly until the material melts, start the stirrer, continue heating for about 1 hour to 175 ° C ~ 180 ° C, keep warm for 3 hours, cool down and discharge the material, and then the self-made reactive diluent is obtained. The viscosity at 25 ° C is 280mPa·s, save for subsequent use; Wherein, caprolactone monomer: polyol: the weight ratio of catalyst is 254: 100: 0.4,

Embodiment 3

[0020] Embodiment 3 prepares solvent-free two-component polyurethane putty 1#

[0021] The long-chain vegetable oleic acid-modified polyester resin prepared in Example 1 and the self-made reactive diluent prepared in Example 2 were evenly mixed in a weight ratio of 1:4 to obtain a hydroxyl resin. Weigh 25 parts of hydroxyl resin, 3.75 parts of domestic anatase titanium dioxide, 3 parts of Shanghai # Add 0.75 parts of carbon black, 22.5 parts of precipitated barium sulfate, 45 parts of talc, 3.75 parts of dolomite, 10.1 parts of dispersant BYK-1610.1 part of defoamer AFCONA-27220.1 part and 0.1 part of leveling agent EFKA-37770. After ~15 minutes, use a three-roller to grind to a fineness of 60 μm, and the output is component A;

[0022] Commercially available crude polymethylene polyphenyl polyisocyanate and modified diphenylmethane diisocyanate are uniformly mixed in a weight ratio of 4:1 to form component B;

[0023] Take component A and component B and mix them evenly at ...

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Abstract

The invention relates to solvent-free two-component polyurethane putty for a rotor wing. The component A of the putty comprises the following components in parts by weight: 20-30 parts of hydroxy resin, 2-6 parts of titanium dioxide powder, 0.5-2 parts of carbon black, 15-25 parts of precipitated barium sulfate, 40-60 parts of talcum powder, 2-6 parts of dolomite, 0.1-1 part of dispersant, 0.1-1 part of defoaming agent and 0.1-1 part of flatting agent, wherein the hydroxy resin is a mixture of long-chain vegetable oleic acid modified polyester resin and self-prepared reactive diluent at a weight ratio of 1:(3-7). The component B is prepared by mixing crude polyaryl-polymethylene isocyanate (PAPI) and modified methylene diphenyl diisocyanate (MDI) according to a weight ratio of (1-4):1. When the solvent-free two-component polyurethane putty is used, the component A and the component B are mixed evenly according to a weight ratio of (4-6):1. The putty has extremely high adhesion to the epoxy glass fiber reinforced plastic type composite, good filling property, convenience in construction and easiness in polishing and meets the requirements of environmental protection. The comprehensive performance of the putty can completely meet the operational requirement of the rotor wing.

Description

technical field [0001] The invention relates to a solvent-free two-component polyurethane putty for a rotor. Background technique [0002] The rotor consists of a hub and several blades. Most of the blades of the rotor are made of composite materials such as epoxy glass fiber reinforced plastics, which are characterized by low relative density, high specific strength, and good chemical corrosion resistance. However, in nature, it will be affected by factors such as sun exposure, rain, wind and sand, etc., resulting in aging phenomena, which will change the appearance and mechanical properties of composite materials. In order to improve the durability of composite materials, it is necessary to protect the composite materials by spraying coatings. Before the primer and topcoat are sprayed, the defects on the surface of the substrate need to be treated, so putty needs to be used to fill the defects. This kind of putty needs to have strong adhesion and strength, and good flex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/34C08G63/49
Inventor 潘云飞王李军谭伟民周如东陆文明
Owner CHINA NAT OFFSHORE OIL CORP
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