CN-119775766-B - Nylon material and preparation method and application thereof

Abstract

The invention relates to the technical field of high polymer materials, and discloses a nylon material, a preparation method and application thereof. The nylon material comprises the following preparation raw materials, by mass, 70% -85% of nylon resin, 8% -15% of nitrogen flame retardant, 2% -8% of phosphorus flame retardant and 1% -8% of synergistic flame retardant. According to the nylon material provided by the invention, the phosphorus flame retardant and the synergistic flame retardant are added into the traditional nitrogen flame retardant system, so that the glow wire ignition temperature of the material is increased, the dripping speed and the dripping ignition probability are reduced, and the flame retardant property of the material is improved. The glowing filament ignition temperature of the material can reach 745 ℃, the DSC crystallization temperature can reach 187 ℃, the demolding effect is good, the dripping speed is low, the dripping ignition probability is low, the performance requirement of a battery assembly product on the material can be met, and the material can be used for preparing an electronic connector, a battery bin, a low-voltage switch, a shell or a power distribution system terminal of electronic and electric equipment.

Inventors

• TANG CHENGHAO
• LI QITIAN
• GUO ZHENLIAN
• WANG LULIN
• CHEN XIAOQIANG
• HUANG CHENGYAN
• CHEN YU
• ZENG HUACHANG

Assignees

• 广州市聚赛龙工程塑料股份有限公司
• 芜湖聚赛龙新材料科技有限公司

Dates

Publication Date

20260508

Application Date

20241231

Claims (6)

1. 1. The nylon material is characterized by comprising, by mass, 70% -85% of nylon resin, 8% -15% of nitrogen flame retardant, 2% -8% of phosphorus flame retardant, 1% -8% of synergistic flame retardant and 0.1% -2% of nucleating agent; The phosphorus flame retardant is a compound phosphorus flame retardant composed of melamine pyrophosphate and zinc phytate in any proportion, the synergistic flame retardant is a compound of zinc borate and glass powder with the mass ratio of 1 (1-5), the melting point of the glass powder is less than 800 ℃, the nucleating agent comprises talcum powder and at least one of calcium stearate and glyceryl monostearate, and the talcum powder accounts for 70-80% of the mass of the nucleating agent; The nylon material is prepared by mixing all preparation raw materials except a phosphorus flame retardant to obtain a premix, adding the premix from a main feeding port of a double-screw extruder for melt mixing, adding the phosphorus flame retardant from a side feeding port of the double-screw extruder, and performing melt extrusion granulation to obtain the nylon material.
2. 2. The nylon material of claim 1, wherein the nitrogen-based flame retardant comprises melamine cyanurate.
3. 3. The nylon material according to claim 1, further comprising, in mass percent, 0.1% -1% of an antioxidant and 0.01% -0.2% of a surface modifier.
4. 4. A method for producing a nylon material according to any one of claims 1 to 3, comprising the steps of: Mixing all preparation raw materials except the phosphorus flame retardant to obtain a premix, adding the premix from a main feeding port of a double-screw extruder for melt mixing, adding the phosphorus flame retardant from a side feeding port of the double-screw extruder, and performing melt extrusion granulation to obtain the nylon material.
5. 5. The preparation method according to claim 4, wherein the temperature of each section of barrel from the hopper to the die head of the twin-screw extruder is 170-190 ℃, 220-240 ℃, 230-250 ℃, 240-260 ℃, 250-270 ℃, 220-240 ℃, 210-230 ℃ and 210-230 ℃ in the eighth section; and/or the side feeding port is positioned in a fifth section cylinder of the double-screw extruder.
6. 6. Use of a nylon material according to any one of claims 1-3 for the preparation of a battery assembly article.

Description

Nylon material and preparation method and application thereof Technical Field The invention relates to the technical field of high polymer materials, in particular to a nylon material and a preparation method and application thereof. Background With the comprehensive expansion of the new energy automobile industry market, the demand of a power system and an electric control system on connectors for distributing current is rapidly increased, the parts are required to have higher safety, the glow wire ignition temperature of the material is required to be higher, and the material should be rapidly extinguished after the glow wire ignition at higher temperature. The material added with the traditional brominated flame retardant cannot meet the environmental protection requirement, so that a flame retardant material with high flame retardant property and more environmental protection needs to be developed. The nylon material has the advantages of good processability, chemical resistance, mechanical property and the like, and is widely applied to the market. Nylon belongs to a combustible material, and emits a large amount of smoke and toxic gas during combustion, and is accompanied by dripping and ignition phenomena, so that the nylon cannot meet the high flame-retardant requirements of household appliances and electronic appliances. The flame-retardant modified nylon material mainly comprises two types of halogen flame-retardant modification and halogen-free flame-retardant modification, wherein the halogen flame-retardant modified nylon has good flame-retardant effect and simple preparation process, but generates a large amount of toxic halogen gas when in combustion, and the halogen gas escapes to the air and is easy to combine with water to form strong corrosive liquid, so that the halogen-free flame retardant can seriously harm human health and cause obstruction to fire disaster escape, and compared with the halogen-free flame retardant mainly comprising nitrogen and phosphorus has better safety and is more environment-friendly. The flame retardant commonly used at present for halogen-free flame-retardant modified nylon is Melamine Cyanurate (MCA) flame retardant. MCA belongs to a nitrogen flame retardant, and the main body is powder with greasy feel and has a certain lubricating effect. The flame retardant mechanism mainly comprises the following points that a ① MCA flame retardant molecular structure is provided with a large-area hydrogen bond network, the flame retardant has good heat resistance, a nylon substrate can be helped to absorb a large amount of heat when the material is heated and decomposed, the overall temperature is reduced, the ② MCA flame retardant can be quickly carbonized to generate a flame-retardant compact honeycomb-shaped non-combustible carbon layer when being combusted, the foam-shaped carbon layer effectively limits the diffusion of heat and blocks oxygen, ③ MCA flame retardant can release nitrogen to form an inert atmosphere after being heated and decomposed, and surface oxygen is diluted to reduce combustion reaction, and ④ MCA halogen-free flame retardant nylon can take away heat through a softening part in a dripping combustion process. However, nylon materials modified by using only MCA have the defects that the ignition temperature of a ① nylon glow wire is not ideal, ② MCA has poor dispersibility in the nylon material and is easy to cause insufficient flame retardant property, small molecules are easy to separate out in the ③ injection molding process to shorten the time interval for cleaning a die, and ④ MCA can reduce the crystallization speed of nylon to prolong the molding time. Disclosure of Invention The present invention aims to solve at least one of the above technical problems in the prior art. Therefore, one of the purposes of the invention is to provide a nylon material, the other purpose of the invention is to provide a preparation method of the nylon material, and the third purpose of the invention is to provide the application of the nylon material. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The first aspect of the invention provides a nylon material, which comprises the following preparation raw materials, by mass, 70% -85% of nylon resin, 8% -15% of nitrogen flame retardant, 2% -8% of phosphorus flame retardant and 1% -8% of synergistic flame retardant. According to the invention, aiming at the problem that the flame retardant effect is poor when the nitrogen flame retardant is singly used, the nitrogen flame retardant and the phosphorus flame retardant are used in a compounding way, the nitrogen flame retardant can release nitrogen gas during decomposition to form an inert gas phase, and the oxygen concentration is reduced, so that combustion is inhibited, the phosphorus flame retardant can form a solid-phase and gas-phase flame retardant barrier through releasing substances such as phosphoric acid,