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Flame retardant polyamide with low moisture-regain rate and preparation method of polyamide

A technology of flame-retardant polyamide and moisture regain, which is applied in the field of polymer synthesis, can solve the problems of reducing the mechanical properties of materials, and achieve the effects of excellent mechanical properties, good mechanical properties, and good flame retardancy

Inactive Publication Date: 2017-12-22
THE QUARTERMASTER EQUIP INST OF THE LOGISTICAL SUPPORT DEPT CMC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a low moisture regain flame-retardant polyamide and its preparation method to solve the problem of reducing the mechanical properties of the material caused by adding a large amount of flame retardants in the blending method

Method used

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  • Flame retardant polyamide with low moisture-regain rate and preparation method of polyamide
  • Flame retardant polyamide with low moisture-regain rate and preparation method of polyamide
  • Flame retardant polyamide with low moisture-regain rate and preparation method of polyamide

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Experimental program
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Effect test

Embodiment 1

[0044] Embodiment 1, preparation low moisture regain flame-retardant polyamide

[0045] 1. Polymerization of flame retardant prepolymer

[0046] CEPPA, undecyl diamine, pentylene glycol and water were mixed for 0.5h, and the molar ratio was 1:1.1:1:50, put into the reaction kettle, mixed for 0.5h, heated to 50°C under nitrogen protection, and stirred Carry out prepolymerization reaction for 0.5h. After the prepolymerization reaction, the pressure was increased to 0.3 MPa, and the temperature was further raised for the polymerization reaction under the protection of nitrogen, and the reaction was carried out at a temperature of 180° C. for 1 hour to obtain a flame retardant prepolymer with a weight average molecular weight of 3000.

[0047] 2. Low moisture regain flame retardant polyamide polymerization

[0048] Put 52wt% polyamide 66 salt solution into the reaction kettle, concentrate the 52wt% polyamide 66 aqueous solution salt to 80wt% at 150°C, raise the temperature to 20...

Embodiment 2

[0050] Embodiment 2, preparation low moisture regain flame-retardant polyamide

[0051] 1. Polymerization of flame retardant prepolymer

[0052] The sodium salt of DDP, dodecyl diamine, diol and water are mixed for 0.5h, and the molar ratio is 1:1.1:1:100, put them into the reaction kettle, and carry out under stirring at 70°C under nitrogen protection. Prepolymerization reaction 1h. After the prepolymerization reaction, the pressure was increased to 0.3 MPa, and the temperature was further raised for polymerization under the protection of nitrogen, and the reaction was carried out at a temperature of 185° C. for 1 hour to obtain a flame retardant prepolymer with a weight average molecular weight of 4000.

[0053] 2. Low moisture regain flame retardant polyamide polymerization

[0054] Put 52wt% polyamide 66 salt solution into the reaction kettle, concentrate the 52wt% polyamide 66 aqueous solution salt to 80wt% at 150°C, raise the temperature to 205°C, increase the pressure...

Embodiment 3

[0056] Embodiment 3, preparation low moisture regain flame-retardant polyamide

[0057] 1. Polymerization of flame retardant prepolymer

[0058] DDP, tetradecanediamine, decanediol and water were mixed for 1 hour at a ratio of 1:1.2:1:70 and put into the reactor, and the prepolymerization reaction was carried out under stirring at 90°C under nitrogen protection for 1 hour. After stirring and reacting, the pressure was increased to 0.3 MPa, and the temperature was further raised for polymerization under the protection of nitrogen, and the reaction was carried out at a temperature of 190° C. for 1.5 hours to obtain a flame retardant prepolymer with a weight average molecular weight of 5,000.

[0059] 2. Low moisture regain flame retardant polyamide polymerization

[0060] Put 52wt% polyamide 66 salt solution into the reaction kettle, concentrate the 52wt% polyamide 66 aqueous solution salt to 80wt% at 150°C, raise the temperature to 210°C, increase the pressure and hold the pre...

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Abstract

The invention discloses flame retardant polyamide with a low moisture-regain rate and a preparation method of the polyamide. The preparation method of the flame retardant polyamide with the low moisture-regain rate comprises the following steps: a flame retardant containing phosphorus, a long carbon chain diamine and a dihydric alcohol are subjected to a pre-polymerization reaction in water, and a polymerization reaction is performed to obtain a flame retardant prepolymer; and the flame retardant prepolymer and a polyamide 66 salt are subjected to a co-polymerization reaction, and therefore the flame retardant polyamide with the low moisture-regain rate is obtained. According to the invention, the long carbon chain diamine, the dihydric alcohol and the flame retardant containing the phosphorus are subjected to polymerization to obtain the flame retardant prepolymer, the flame retardant prepolymer and the polyamide 66 salt are subjected to polymerization, and therefore the flame retardant polyamide copolymer with the low moisture-regain rate is obtained, wherein the polyamide has good mechanical properties, the low moisture-regain rate and flame retardance. The flame retardant polyamide with the low moisture-regain rate is applied to the fields such as spaceflight aviation and electronics and electrical appliances. The flame retardant polyamide with the low moisture-regain rate has good flame retardance, the low moisture-regain rate, has no halogens or red phosphorus, is friendly to environments, and has excellent mechanical properties. According to the preparation method provided by the invention, the prepared polyamide material is simple in process, has good mechanical properties, the low moisture-regain rate and the flame retardance, and is suitable for large-scale promotion.

Description

technical field [0001] The invention relates to a low moisture regain flame-retardant polyamide and a preparation method thereof, belonging to the field of polymer synthesis. Background technique [0002] Polyamide (commonly known as nylon) is a type of thermoplastic material with the most applications, the largest uses, the most complete varieties, the best cost performance, and excellent comprehensive performance among engineering plastics. It is widely used in electronics, electrical appliances, and high-voltage electrical components. The flame retardant method of polyamide generally adopts the blending method or the copolymerization method. The blending method has problems such as adding a large amount of flame retardant, which has a great impact on the mechanical properties of the material after adding; while the copolymerization method has complex processes, difficult reaction control, and reactive flame retardants. At the same time, whether it is a blending method or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/42C08L77/06C08K3/02
CPCC08G69/42C08K3/02C08K2003/026C08L2201/02C08L2201/22C08L2203/20C08L77/06
Inventor 冯新星张华王修行来侃张长琦潘凯
Owner THE QUARTERMASTER EQUIP INST OF THE LOGISTICAL SUPPORT DEPT CMC
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