Preparation method of self-lubricating and high-strength pouring nylon
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A casting nylon, high-strength technology, applied in chemical instruments and methods, fibrous fillers, dyed organic silicon compound treatment, etc., to achieve the effect of simple process route, simple molding control, simple process equipment and equipment
Inactive Publication Date: 2011-08-17
WUHAN INSTITUTE OF TECHNOLOGY
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Although cast nylon has the above advantages, it is difficult to solve the problems of strength and wear resistance at the same time
Method used
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Embodiment 1
[0032] 20g nano TiO 2 Join in 80ml dehydrated ethanol, stir rapidly, obtain TiO 2 Anhydrous ethanol mixture; take 1g KH-550 coupling agent dissolved in 20ml water and mix with TiO 2 mixed with anhydrous ethanol mixture, stirred at 60°C for 4 hours, and the system was centrifuged to obtain the lower paste, which was dried in an oven at 90°C and ground through a 400-mesh sieve to obtain surface-modified nano-TiO 2 .
Embodiment 2
[0034] 100g nano-TiO 2 Join in 500ml dehydrated ethanol, stir rapidly, obtain TiO 2 Anhydrous ethanol mixture; take 4g KH-50 coupling agent dissolved in 50ml water and mix with TiO 2 mixed with anhydrous ethanol mixture, stirred at 50°C for 6 hours, and the system was centrifuged to obtain the lower paste, which was dried in an oven at 100°C, and ground through a 400-mesh sieve to obtain surface-modified nano-TiO 2 .
Embodiment 3
[0036] 20g of industrial-grade nano-graphite powder is added to 200ml of sodium hydroxide solution with a concentration of 30% by mass, soaked at 50°C for 12 hours, then filtered to remove the sodium hydroxide solution, and the filtered nano-graphite powder is put into an oven 110°C. ℃ drying, grinding through a 400-mesh sieve to obtain basic nano-graphite powder.
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Abstract
The invention relates to a preparation method of a self-lubricating and high-strength pouring nylon, comprising the following steps of: (1) stirring and heating a caprolactam monomer, surface-modified nano TiO2 and nano graphite powder subjected to alkaline treatment, and vacuumizing simultaneously, continuously stirring a caprolactam fused mass mixture to obtain a caprolactam fused mass containing a nano composite material; (2) adding a sodium hydroxide solid to the caprolactam fused mass, raising temperature and continuously stirring to obtain an alkaline caprolactam fused mass mixture; (3)restoring the pressure of a reaction kettle to the atmospheric pressure, adding IPDI (Isophorone Diisocyanate) or TDI (Toluene Diisocynate) to the reaction kettle, uniformly stirring to obtain a caprolactam nylon prepolymer; and (4) flowing or pressurizing the prepolymer and injecting to a mold cavity, closing a mold, then continuously warming, then naturally cooling to room temperature to obtaina formed self-lubricating and high-strength pouring nylon part. The preparation method of the self-lubricating and high-strength pouring nylon has the advantages of simple process device and apparatus, simple process route, simple formation and control and unlimited part size and shape.
Description
technical field [0001] The invention relates to a preparation method of self-lubricating high-strength cast nylon, which belongs to the technical field of polymer nylon materials. Background technique [0002] Cast nylon is a polymer structure material with low density, high mechanical strength, high toughness, excellent electrical properties, wear resistance, shock resistance and sound absorption, acid and alkali resistance and general organic solvents, and easy molding and processing. It can be widely used in mechanical equipment. Grinding parts, replacing copper and alloys as wear-resistant and vulnerable parts of equipment. Such as bushings, bearing bushes, bushings, liners, gears, piston rings, sealing rings, sliders, ball bowls, impellers, blades, cams, nuts, valve plates, pipes, stuffing boxes, racks, pulleys and pump rotors, etc. . The application of cast nylon parts can not only improve mechanical efficiency, reduce maintenance, but also extend the service life by...
Claims
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