Casting polyurethane/diatomite composite material and preparation method thereof

A composite material and diatomite technology, which is applied in the field of casting polyurethane/diatomite composite material and its preparation, can solve the problems such as the diatomite modified CPU composite material which has not been seen, and achieve the improvement of mechanical properties and heat resistance, The effect of low energy consumption and convenient processing and molding

Inactive Publication Date: 2012-07-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, there has been no report on the use of diatomaceous earth modified CPU composites

Method used

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  • Casting polyurethane/diatomite composite material and preparation method thereof
  • Casting polyurethane/diatomite composite material and preparation method thereof
  • Casting polyurethane/diatomite composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Weigh 20g diatomaceous earth with a particle size of 2000 mesh and add it to a three-necked flask, then add 400mL cyclohexane, 0.4g n-propylamine and 2g silane coupling agent KH-560, and stir at room temperature for 30min at a stirring speed of 500r / min , And then stirred at 50°C for 30 min. Rotary evaporate the reacted solution at 60°C for 1 hour, then vacuum dry at 60°C for 30 hours, and collect diatomaceous earth;

[0031] (2) Weigh 100g of prepolymer (NCO-based mass content is 5.0±0.2%) and preheat it at 80℃ for 1h, then weigh 0.5g of modified diatomaceous earth and add it to the above prepolymer. Mix and stir for 10min at 500r / min. The resulting mixture was then placed in a vacuum drying oven at 80°C for vacuum degassing for 10 minutes. Weigh 21.4g of M-CDEA chain extender, heat and melt at 110°C, add it to the above mixture, and mix and stir for 40s at a stirring speed of 500r / min. Then the obtained mixture was poured into a mold and placed on a plate vulcaniz...

Embodiment 2

[0033] (1) Weigh 25g of diatomaceous earth with a particle size of 2000 mesh and add it to a three-necked flask, then add 550mL of cyclohexane, 0.4g of n-propylamine and 3g of silane coupling agent KH-550, and stir at room temperature for 40min at a stirring speed of 600r / min , And then stirred at 60°C for 40 min. Rotary evaporate the reacted solution at 70°C for 1 hour, then vacuum dry at 65°C for 28 hours, and collect diatomaceous earth;

[0034] (2) Weigh 100g of prepolymer (NCO content is 5.0±0.2%) and preheat it at 85℃ for 1.5h, then weigh 1g of modified diatomaceous earth and add it to the above prepolymer at a stirring speed of Mix and stir for 20 minutes at 600r / min. Subsequently, the resulting mixture was placed in a vacuum drying oven at 85°C for vacuum degassing for 20 minutes. Weigh 21.4g of M-CDEA chain extender, heat and melt at 115°C, add to the above mixture, mix and stir for 45s at a stirring speed of 600r / min. Then the obtained mixture was poured into a mold ...

Embodiment 3

[0036] (1) Weigh 30g of diatomaceous earth with a particle size of 2000 mesh and add it to a three-necked flask, then add 700mL of cyclohexane, 0.5g of n-propylamine and 4g of silane coupling agent KH-570, and stir for 50min at room temperature at a stirring speed of 650r / min , And then stirred at 60°C for 50 min. Rotary evaporate the reacted solution at 80°C for 50 minutes, then vacuum dry at 70°C for 24 hours, and collect diatomaceous earth;

[0037] (2) Weigh 100g of prepolymer (NCO content is 5.0±0.2%) and preheat at 88℃ for 2h, then weigh 3g of modified diatomaceous earth and add it to the above prepolymer at a stirring speed of 650r Mix and stir for 25 min at / min. The resulting mixture was then placed in a vacuum drying oven at 88°C for vacuum degassing for 25 minutes. Weigh 21.4g of M-CDEA chain extender, heat and melt at 120°C, add to the above mixture, and mix and stir for 50s at a stirring speed of 650r / min. Then the obtained mixture was poured into a mold, and plac...

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Abstract

The invention relates to a casting polyurethane / diatomite composite material and a preparation method thereof. The composite material is prepared from the following raw materials: diatomite (modified by a silane coupling agent), polyurethane prepolymers and a chain extender, wherein the mass of the diatomite (modified by the silane coupling agent) accounts for 0.5-10% of that of the polyurethane prepolymer. The preparation method comprises the following steps: (1) at room temperature, carrying out modification on the diatomite by using a silane coupling agent so as to obtain modified diatomite; and (2) weighting and preheating polyurethane prepolymers, and adding the modified diatomite obtained in the step (1) into the preheated polyurethane prepolymers, mixing and stirring, then carrying out vacuum defoamation on the obtained object so as to obtain a mixture, after the chain extender is heated and molten, adding the molten chain extender into the mixture, mixing and stirring, casting the object into a mould to carry out primary vulcanization, after the primary vulcanization is completed, carrying out demoulding on the obtained object, and finally, carrying out secondary vulcanization on the obtained object. The CPU / diatomite composite material prepared in the invention is good in mechanical properties and heat resistance; and the preparation method disclosed by the invention is simple, direct, low in energy consumption, convenient for processing and forming, and suitable for being applied to industrial production.

Description

Technical field [0001] The invention belongs to the field of casting polyurethane composite material and its preparation, and particularly relates to a casting polyurethane / diatomite composite material and a preparation method thereof. Background technique [0002] Castable polyurethane (CPU) is commonly known as liquid rubber. It is made by reacting oligomer polyols such as polyester or polyether with polyisocyanates and chain extenders. With good wear resistance, mechanical properties and shock absorption, it is widely used in electromechanical, shipbuilding, aviation, vehicles, civil engineering, light industry, textile and other sectors. However, the strength of the CPU is not high, and its heat resistance, water resistance, and antistatic properties are poor. In general, its long-term use temperature cannot exceed 80°C, and the short-term use temperature cannot exceed 120°C, which limits its further application. [0003] Diatomaceous earth is a kind of non-metallic mineral th...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08K9/06C08K3/34B29C35/02
Inventor 李耀刚陈莹王新威王宏志张青红
Owner DONGHUA UNIV
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