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Preparation method of polyurethane sieve plate

A technology of polyurethane and polyurethane prepolymer is applied in the field of preparation of polyurethane sieve plates, which can solve the problems of poor adaptability, easy hydrolysis, and large heat generation, and achieve the effects of improving wear resistance and improving hydrolysis resistance stability.

Inactive Publication Date: 2012-11-21
奥斯汀新材料(张家港)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the ordinary polyester polyurethane sieve plate in China has high tensile strength and good wear resistance, but it has poor adaptability to the hot and humid mine environment, and it generates a lot of internal heat during high-speed vibration and is easy to hydrolyze; while polyether polyurethane sieve plate It has good resilience and excellent hydrolysis resistance, but its strength and wear resistance are poor

Method used

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  • Preparation method of polyurethane sieve plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In a 1.5L reactor, 70g of nano-barium sulfate powder, 5g of titanate coupling agent, and 0.5g of stannous octoate were added to 250g of polycaprolactone polyol with a number average molecular weight of 2000, and then added with a number average molecular weight of 250g of polytetrahydrofuran at 3000°C, stirred and dispersed evenly at 5500rpm, put it into the reactor, raised the temperature to 105°C, and the vacuum degree reached -0.09MPa, reacted for 3h, added 200g of diphenylmethane diisocyanate under the protection of nitrogen, and obtained the modified polytetrahydrofuran Ester, polyether hybrid polyurethane prepolymer.

[0024] The above-mentioned modified polyester, polyether mixed polyurethane prepolymer and ether bond-containing diamine chain extender 2,2-bis[4-(4-aminophenoxy)-phenyl]-propane according to the mass ratio 100:9, mix at a stirring speed of 5500rpm, pour the mixture into a mold at 125°C, pre-cure in an oven at 110°C for 20 minutes, and then demould,...

Embodiment 2

[0027] In a 1.5L reactor, 70g of nano barium sulfate powder, 0.6g of silane coupling agent, and 1.5g of methyl titanate were added to 250g of polycaprolactone polyol with a number average molecular weight of 4000, and then added with a number average molecular weight of 120g of polytetrahydrofuran at 4000°C, stirred and dispersed evenly at 6000rpm, put it into the reactor, raised the temperature to 100°C, and the vacuum degree reached -0.085MPa, reacted for 2h, added 320g of diphenylmethane diisocyanate under the protection of nitrogen, and obtained the modified polytetrahydrofuran Ester, polyether hybrid polyurethane prepolymer.

[0028] The above-mentioned modified polyester, polyether mixed polyurethane prepolymer and ether bond-containing diamine chain extender 2,2-bis[4-(4-aminophenoxy)-phenyl]-propane according to the mass ratio 100:11, mix at a stirring speed of 6000rpm, inject the mixed solution into a mold at 120°C, pre-cure in an oven at 110°C for 25 minutes, and the...

Embodiment 3

[0031] In a 1.5L reactor, add 90g of nanometer barium sulfate powder, 1g of aluminate coupling agent, and 3g of dibutyltin dilaurate to 250g of polycaprolactone polyol with a number average molecular weight of 2000, and then add 400g of polytetrahydrofuran with a temperature of 2000, stirred and dispersed evenly at a speed of 5800rpm, put it into the reactor, raised the temperature to 110°C, and the vacuum degree reached -0.1MPa, reacted for 2.5h, and added 250g of diphenylmethane diisocyanate under the protection of nitrogen to obtain a modified Post-polyester, polyether hybrid polyurethane prepolymer.

[0032] The above-mentioned modified polyester, polyether mixed polyurethane prepolymer and ether bond-containing diamine chain extender 2,2-bis[4-(4-aminophenoxy)-phenyl]-propane according to the mass ratio 100:12, mix at a stirring speed of 5800rpm, inject the mixed solution into a mold at 130°C, pre-cure in an oven at 115°C for 25 minutes, and then demould, then put it in a...

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Abstract

The invention discloses a preparation method of polyurethane sieve plate. The method comprises the following steps of: (1) preparing a prepolymer; (2) mixing; (3) casting; (4) precuring and demoulding; and (5) post-curing. The method provided by the invention uses polyester and polyether polyol as raw materials, improves abrasion resistance of the product through introducing nanometer barium sulfate powder, reduces flexibility and improves stiffness of an ether bond through introducing aryl with a steric effect into an ether bond-containing chain extender, thereby enhancing stability to hydrolysis resistance and ensuring various physical and mechanical performances of elastomers at the same time.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane sieve plate, in particular to a preparation method of a polyurethane sieve plate with improved comprehensive performance in terms of wear resistance, hydrolysis resistance and stability in a hot and humid environment. Background technique [0002] Due to the excellent wear resistance, oil resistance, hydrolysis resistance and aging resistance of polyurethane elastomer, the sieve plate prepared with it can not only greatly reduce the weight of equipment, reduce equipment cost, prolong service life, but also reduce noise. It is widely used in mines, Vibrating screen washing and classifying operations in metallurgy, coke, coal washing, petroleum, chemical and other industries. However, at present, the ordinary polyester polyurethane sieve plate in China has high tensile strength and good wear resistance, but it has poor adaptability to the hot and humid mine environment, and it generates a lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/32C08G18/12C08K13/02C08K3/30C08L75/06C08L75/08
Inventor 李敏超承黎明赵艳琼孙亚飞杨廷廷艾玲李长顺
Owner 奥斯汀新材料(张家港)有限公司
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