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Self-repairing polyurethane concrete piston head and preparation method thereof

A polyurethane and self-repairing technology is applied in the field of self-repairing polyurethane concrete piston head and its preparation, which can solve the problems of easy scratches and wear, short life, etc. Effect

Pending Publication Date: 2022-07-01
JIANGSU XCMG CONSTR MASCH RES INST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the prior art polyurethane concrete piston head, such as easy to scratch and wear, short life, etc., to provide a self-repairing polyurethane concrete piston head and its preparation method

Method used

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  • Self-repairing polyurethane concrete piston head and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method of a self-repairing polyurethane concrete piston head comprises the following steps:

[0037] (1) Weigh in parts by weight 30 parts of MDI50, 80 parts of PPG1000, 40 parts of BDO, 60 parts of chain extender, 15 parts of BME, and 8 parts of defoamer;

[0038] (2) PPG was added to the three-necked flask, heated and stirred in an oil bath, and the temperature was slowly raised to 110~120°C. Then vacuum dehydration for 1.5h, keeping the vacuum degree at -0.01Mpa. Cool to 50~60℃, add MDI and react for 1h. Continue to heat to 80°C for 3 hours to obtain polyurethane component A, which is sealed and stored;

[0039] (3) Put the chain extender, BDO, BME, and defoamer in the bucket, stir for 10 minutes, vacuumize and remove foam for 10 minutes, and keep the vacuum degree at -0.01 Mpa to obtain the polyurethane component B, which is sealed and stored;

[0040] (4) Add 3000g of polyurethane A component to tank A of the pouring machine, control the temperatur...

Embodiment 2

[0047] (1) Weigh 40 parts by weight of MDI100, 90 parts of PPG2000, 45 parts of BDO, 60 parts of chain extender, 10 parts of BME, and 6 parts of defoamer;

[0048] (2) PPG was added to the three-necked flask, heated and stirred in an oil bath, so that the temperature was slowly raised to 100~110°C. Then vacuum dehydration for 2h, keeping the vacuum degree at -0.01Mpa. Cool to 50~60℃, add MDI and react for 1h. Continue to heat to 70°C for 4 hours to obtain polyurethane component A, which is sealed and stored;

[0049] (3) Put the chain extender, BDO, BME, and defoamer in the bucket, stir for 10 minutes, vacuumize and remove foam for 10 minutes, and keep the vacuum degree at -0.01 Mpa to obtain the polyurethane component B, which is sealed and stored;

[0050] (4) Add 3000g of polyurethane A component into the A tank of the casting machine, control the temperature at 90°C, and stir at a medium and low speed at 650rpm;

[0051] (5) Add 500g of polyurethane component B into the...

Embodiment 3

[0057](1) Weigh 50 parts by weight of MDI50, 100 parts of PPG2000, 50 parts of BDO, 70 parts of chain extender, and 10 parts of defoamer;

[0058] (2) PPG was added to the three-necked flask, heated and stirred in an oil bath, so that the temperature was slowly raised to 100~1120°C. Then vacuum dehydration for 2h, keeping the vacuum degree at -0.01Mpa. Cool to 50~60℃, add MDI and react for 1h. Continue to heat to 90°C for 3 hours to obtain polyurethane component A, which is sealed and stored;

[0059] (3) Put the chain extender, BDO and defoamer in the bucket, stir for 10 minutes, vacuumize for 10 minutes, and keep the vacuum degree at -0.01 Mpa to obtain the polyurethane component B, which is sealed and stored;

[0060] (4) Add 3000g of polyurethane A component into the A tank of the casting machine, control the temperature at 90°C, and stir at a medium and low speed at 650rpm;

[0061] (5) Add 500g of polyurethane component B into the B tank of the pouring machine, and st...

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Abstract

The invention discloses a self-repairing polyurethane concrete piston head and a preparation method thereof. The self-repairing polyurethane concrete piston head comprises the following components in parts by weight: 30-50 parts of MDI, 80-100 parts of PPG, 40-50 parts of BDO, 50-70 parts of a chain extender, 10-20 parts of BME and 5-15 parts of a defoaming agent. The invention has the advantages that: the polyurethane component B is added into the polyurethane component A, so that frictional wear scratch self-repairing can be realized at parts such as a sealing lip, a contact surface with a cylinder barrel, a contact surface with concrete and the like; disulfide bonds and hydrogen bonds formed by MDI, PPG and BME are contained, internal dispersion and distribution are uniform, and self-repairing can be achieved under the room temperature condition; the mechanical property is excellent, and the high-friction and high-pressure concrete pumping working condition is met; the process for preparing the self-repairing polyurethane concrete piston head is simple, easy to process and stable in performance.

Description

technical field [0001] The invention relates to a self-repairing polyurethane concrete piston head and a preparation method thereof, belonging to the technical field of mechanical manufacturing. Background technique [0002] Concrete piston head is a vulnerable part used in concrete pump trucks, which plays the role of sealing the cavity and providing pressure during the conveying process of concrete. Because the conveying concrete medium is hard and complicated, the surface of the concrete piston head is easily scratched, so the concrete piston head needs to have self-healing performance. [0003] The existing assembled concrete piston heads are mainly made of rubber and polyurethane. The rubber concrete piston head is made of nitrile rubber with good oil resistance as the main body, adding reinforcing agent, anti-aging agent, plasticizer, vulcanizing agent, etc., mixing and hot pressing. The wear resistance of the rubber concrete piston head is average, the strength is l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/38
CPCC08G18/6685C08G18/48C08G18/3206C08G18/3814C08G18/3876
Inventor 尹龙陈波朱志峰
Owner JIANGSU XCMG CONSTR MASCH RES INST LTD
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