Unlock instant, AI-driven research and patent intelligence for your innovation.

One-step forming processing method of glass fiber reinforced in-situ polymerization flame-retardant nylon

An in-situ polymerization and flame-retardant nylon technology, applied in the field of flame-retardant nylon, can solve the problems of large amount of flame retardants and poor mechanical properties, and achieve excellent flame-retardant properties and reduce costs

Pending Publication Date: 2022-01-14
四川朗迪新材料有限公司
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is more evenly dispersed in the nylon 6 matrix than the first method, the composite material has better thermal stability and mechanical properties, and the process is simpler, but the prepared nylon 6-based flame-retardant composite material Disadvantages of large amount of flame retardant required and poor mechanical properties

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of glass fiber reinforced in-situ polymerization flame-retardant nylon (ADP content 5wt%) one-time molding processing and method:

[0027] Accurately weigh 400g of caprolactam, 20g of ADP, 10g of deionized water and 4g of concentrated phosphoric acid. A 1L autoclave was added in turn, the reactor was sealed, vacuumed and nitrogen was introduced to replace the air in the reactor three times. Set the rotation speed of the stirring device at 50r / min, raise the temperature to 180°C, and keep the reaction for 2 hours; continue to raise the temperature to 260°C, and keep the reaction for 6 hours. The material is discharged under 0.5MPa nitrogen and enters the twin-screw extruder with a screw diameter of 32mm and a ratio of length to diameter of 36:1. Glass fiber chopped strands are added through side feeding, the glass fiber content is 30%, and the temperature is set to 180 in the first zone. ℃, 200°C in zone 2, 210°C in zone 3, 210°C in zone 4, 210°C in zone 5, 210°C...

Embodiment 2

[0029] A kind of glass fiber reinforced in-situ polymerization flame-retardant nylon (ADP content 10wt%) one-time molding processing and method:

[0030] Accurately weigh 400g of caprolactam, 40g of ADP, 10g of deionized water and 4g of concentrated phosphoric acid. A 1L autoclave was added in turn, the reactor was sealed, vacuumed and nitrogen was introduced to replace the air in the reactor three times. Set the rotation speed of the stirring device at 50r / min, raise the temperature to 180°C, and keep the reaction for 2 hours; continue to raise the temperature to 260°C, and keep the reaction for 6 hours. The material is discharged under 0.5MPa nitrogen and enters the twin-screw extruder with a screw diameter of 32mm and a ratio of length to diameter of 36:1. Glass fiber chopped strands are added through side feeding, the glass fiber content is 30%, and the temperature is set to 180 in the first zone. ℃, 200°C in zone 2, 210°C in zone 3, 210°C in zone 4, 210°C in zone 5, 210°...

Embodiment 3

[0032] A kind of glass fiber reinforced in-situ polymerization flame-retardant nylon (ADP content 15wt%) one-time molding processing and method:

[0033] Accurately weigh 400g of caprolactam, 60g of ADP, 10g of deionized water and 4g of concentrated phosphoric acid. A 1L autoclave was added in turn, the reactor was sealed, vacuumed and nitrogen was introduced to replace the air in the reactor three times. Set the rotation speed of the stirring device at 50r / min, raise the temperature to 180°C, and keep the reaction for 2 hours; continue to raise the temperature to 260°C, and keep the reaction for 6 hours. The material is discharged under 0.5MPa nitrogen and enters the twin-screw extruder with a screw diameter of 32mm and a length-to-diameter ratio of 36:1. Glass fiber chopped yarn brand is added through side feeding, the glass fiber content is 30%, and the temperature is set to one zone. 180°C, 200°C in zone 2, 210°C in zone 3, 210°C in zone 4, 210°C in zone 5, 210°C in zone ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the technical field of flame-retardant nylon, and particularly relates to a one-time forming processing method of glass fiber reinforced in-situ polymerization flame-retardant nylon. The method comprises the following steps: S1, accurately weighing a certain amount of caprolactam, diethyl aluminum hypophosphite, deionized water and concentrated phosphoric acid for later use; S2, sequentially adding caprolactam, diethyl aluminum hypophosphite, deionized water and strong phosphoric acid into a high-pressure reaction kettle, sealing the reaction kettle, vacuumizing, and introducing nitrogen to replace air in the reaction kettle; S3, setting the rotating speed of a stirring device of the reaction kettle to be 50 + / -3 r / min, increasing the temperature to 180 + / -10 DEG C, and carrying out heat preservation reaction for 2 + / -0.5 h; continuously raising the temperature to 260 + / -10 DEG C, and keeping the temperature to react for 6 + / -0.5 hours; and S4, discharging a product subjected to heat preservation in S3 under 0.5 MPa nitrogen, feeding the product into a double-screw extruder with the screw diameter of 32 mm and the length-diameter ratio of 36: 1, adding glass fiber chopped yarns through side feeding, and carrying out water-cooling drawing and pelletizing on the glass fiber content of 30%, the main machine rotating speed of 400 r / min and the side feeding rotating speed of 13 HZ to obtain the in-situ polymerization glass fiber reinforced flame-retardant nylon.

Description

technical field [0001] The invention belongs to the technical field of flame-retardant nylon, and in particular relates to a one-time molding processing method of glass fiber reinforced in-situ polymerization flame-retardant nylon. Background technique [0002] Nylon 6 is one of the most widely used and produced engineering plastics in the world. It has excellent chemical stability, excellent mechanical properties and electrical properties, but this thermoplastic engineering plastic has a low oxygen index and is more easily ignited. Therefore, how to make nylon 6 materials have better combustion resistance has become an important research hotspot. At present, the preparation of nylon 6-based flame-retardant composite materials is the most effective way to improve the flame-retardant performance of nylon 6, mainly through two ways: (1) by adding the flame retardant into the nylon 6 matrix through mechanical blending, making it Get flame retardancy. (2) By in-situ polymeriz...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08J5/04C08L77/02C08K5/5313C08K7/14C08G69/16B29B9/06
CPCC08J5/043C08G69/16B29B9/06C08L77/02C08K5/5313
Inventor 高文铭朱以江陈海波叶建军曾昔春黄檑
Owner 四川朗迪新材料有限公司