Cold-proof, impactive and high toughness casting nylon and method for producing the same

Abstract

The invention discloses monomer cast nylon with cold-resistance, impact-resistance and high-tenacity and a preparation method thereof. The components and the weight percentage are as follows: 65.4 percent to 96 percent of caprolactam, 0.1 percent to 0.65 percent of NaOH or sodium methoxide, 0.1 percent to 1.3 percent of isocyanate activator, 1.9 percent to 13 percent of hexamethylphosphoric triamide (HPT) and 1.9 percent to 19.6 percent of glass beads. The process flow is as follows: (1) the caprolactam is melted at 60 DEG C to 90 DEG C; (2) the glass beads and the flexibilizer HPT are added and dehydrated under vacuum with pressure smaller than 0.2KPa; (3) the catalyzer NaOH or sodium methoxide is added and dehydrated under vacuum again or methanol is added; (4) the isocyanate activator is added, fully and evenly mixed and then poured into a mould quickly; and the fashioned nylon product is obtained after natural cooling and demoulding. The monomer cast nylon prepared by the method is characterized by excellent cold resistance, impact resistance and high tenacity.

Description

technical field [0001] The invention relates to a cast nylon composite material and a manufacturing method thereof, belonging to the technical field of material science. Background technique [0002] In the current technology, cast nylon is a widely used engineering plastic, with low polymerization temperature, high crystallinity, large molecular weight, good physical and mechanical properties, mechanical properties, oil resistance, chemical corrosion resistance, etc. . However, at low temperatures, cast nylon, like other non-modified plastics, has greatly reduced performance, low bending strength, impact strength and compressive strength, poor wear resistance, self-slip properties, and poor structural dimensions. stability issues. Especially in the low temperature environment, the product is prone to cracking, and the impact strength and rigidity are significantly reduced, which affects its use in low temperature areas or low temperature fields. The characteristics of th...

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Problems solved by technology

[0003] Such as CN200510024996.0 patent discloses a cold-resistant, impact-resistant and high-strength cast nylon composite material and its manufacturing method, which mainly consists of polyamide monomer, surface treatment agent, silicon dioxide (SiO2) monomer, dispersion medium, Composed of toughening agents, it has a certain degree of toughness and rigidity, and is suitable for use in low temperature environments, but there are problems such as many components, poor cold resistance, complicated process, and high cost.

[0004] Another example is the CN2007100558847.X patent, which discloses a compound composed of caprolactam, glass microspheres, sodium methoxide and toluene diisocyanate, which has the advantages of high impact strength and compressive strength, but has insignificant cold resistance, low toughness, and low production capacity. Disadvantages such as high cost

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