A kind of red phosphorus flame-retardant nylon composite material and its preparation method and the determination method of phosphorus precipitation amount in it

Abstract

The invention discloses a red phosphorus flame-retardant nylon composite material, which comprises the following components by weight: nylon resin: 40-80 parts; reinforcing component: 10-50 parts; red phosphorus flame retardant: 4-12 parts; Red phosphorus stabilizer: 0.5-8 parts; smoke suppressant: 0.5-5 parts; tracking index enhancer: 2-10 parts; masterbatch: 0.5-5 parts; antioxidant: 0.1-0.5 parts. The present invention also correspondingly provides a preparation method of the above-mentioned red phosphorus flame-retardant nylon composite material and a method for measuring phosphorus precipitation in the red phosphorus flame-retardant nylon composite material. The composition of the red phosphorus flame-retardant nylon composite material of the present invention is optimized, and each component interacts synergistically, and the performance of the obtained red phosphorus flame-retardant nylon composite material is more balanced. In addition to high flame-retardant efficiency, excellent mechanical At the same time, it also has the advantages of low smoke density, excellent anti-separation performance and high tracking index.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a red phosphorus flame-retardant nylon composite material and a preparation method thereof. Background technique [0002] Red phosphorus masterbatch is widely used for compounding with nylon resin due to its advantages of high flame retardant efficiency, less addition, low cost, and little impact on the comprehensive performance of the resin matrix. The flame retardant reinforced nylon composite material prepared by it has good flame retardant Performance and mechanical properties, are widely used in electronics, electrical appliances and other fields. With the continuous improvement of environmental protection requirements and the application requirements of flame retardant materials in the electrical field, there are two major problems to be solved in the process of processing and application of red phosphorus flame retardant reinforced nylon: (1) high odor and high...

AI Technical Summary

Problems solved by technology

With the continuous improvement of environmental protection requirements and the application requirements of flame retardant materials in the electrical field, there are two major problems to be solved in the process of processing and application of red phosphorus flame retardant reinforced nylon: (1) high odor and high smoke density: red phosphorus flame retardant composite The material will have a lot of peculiar smell during production and use, and at the same time, the smoke density will be high after burning, which will cause the air quality in the limited space to deteriorate, seriously affecting the physical and mental health of production and users

At present, people mainly add porous substances for limited adsorption or chelation to eliminate odors, but they have not fundamentally solved the problem of odors, especially under high-temperature processing and environmental conditions that have strict requirements on combustion performance, and cannot meet the application requirements.

(2) Poor stability in hot and humid environment: red phosphorus flame retardant composite materials are easily oxidized to generate phosphoric acid and phosphine in long-term high temperature or high humidity environment

Volatile phosphine is extremely toxic and can seriously damage the human respiratory tract, while the generated phosphoric acid will precipitate and deposit on the matching metal surface, corrode the metal and the mold, and reduce the comparative tracking index (CTI) of the molded product ), and ultimately reduce the service life of electronic and electrical components, bringing safety hazards

The current main solution is to microencapsulate the surface of red phosphorus to minimize the decomposition of red phosphorus during processing, but the improvement effect is not satisfactory

[0003] The potential hidden dangers of flame retardant reinforced nylon composites based on red phosphorus greatly limit its wide application in the field of electronic components

[0004] The Chinese invention patent with the publication number CN105585843A discloses a low-precipitation red phosphorus flame-retardant nylon material and its preparation method and application. The patent uses nylon resin as the base material, red phosphorus masterbatch, and rare earth metal oxide as a stabilizer , to prepare a red phosphorus flame-retardant nylon material with high temperature resistance, high humidity, low phosphorus precipitation content, and low metal corrosion, but the red phosphorus concentration of the material is low, resulting in excessive addition, which is not conducive to the control of smoke density and odor , and the stability of the tracking index (CTI) of the composite material is insufficient, and it cannot be stabilized above 550V, which limits the application range of the material

The Chinese invention patent with the publication number CN102492295A discloses a preparation method of ultra-fine and low-precipitation red phosphorus flame-retardant glass fiber reinforced nylon. The patent uses liquid nitrogen freezing and crushing method to refine the particle size of red phosphorus and reduce the particle size of red phosphorus at high temperature, The damage to red phosphorus under the action of strong shear, at the same time, the surface of red phosphorus is double-coated with high-temperature silicone oil and toughening agent to protect red phosphorus and increase the compatibility of red phosphorus and matrix resin. This patent plays a role in slowing down the corrosion of phosphoric acid precipitation However, in the process of nylon processing, under the action of damp heat, high temperature and strong shear, it is easy to damage the red phosphorus coating layer. After the red phosphorus is hydrolyzed and oxidized, phosphoric acid or acidic substances are produced, thereby reducing the electrical insulation of nylon materials. Safety performance, which limits the scope of application of the material

[0005] In the existing technology, it is difficult to balance the properties of red phosphorus flame-retardant nylon materials, and it is difficult to ensure that nylon materials have low smoke density, less red phosphorus precipitation, and high tracking index (CTI) while having excellent flame-retardant properties.

In addition, there is no simple and convenient method for the determination of red phosphorus precipitation in red phosphorus flame-retardant nylon materials in the prior art

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