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Method for recycling and granulating secondary materials of high-performance glass fiber reinforced flame-retardant polybutylene adipamide

A polybutylene adipamide and secondary material technology, which is applied in the processing field of high temperature resistant engineering plastics, can solve the problems affecting the use of glass fiber reinforced flame retardant PA46 granulation material, the melt rupture of the die opening of the machine head, the secondary Uneven material flow and other problems, to achieve the effect of not easy sudden shear thinning, stable material flow performance, and fewer operators

Active Publication Date: 2016-06-22
深圳市磐汩新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the development of the current industrial level, the secondary material recycling method of glass fiber reinforced flame retardant PA46 is mainly the twin-screw extrusion method. Although this method has the advantages of high production efficiency and uniform and dense particles, due to the The secondary material will be subjected to relatively strong shear during the twin-screw extrusion process, resulting in the reduction of glass fiber length and the cutting of PA46 polymer chain segments. The overall mechanical properties of the glass fiber reinforced flame retardant PA46 pellets obtained in this way The drop rate is greater than 25%, and the heat-resistant temperature drop rate is greater than 5°C, which seriously affects the use of glass fiber reinforced flame-retardant PA46 pellets
In addition, due to the large amount of twin-screw extrusion, the secondary material of glass fiber reinforced flame retardant PA46 is prone to uneven flow, melt fracture at the die mouth of the machine head, which cannot be extruded normally, and accumulates into blocky glass Fiber-reinforced flame-retardant PA46 block, unusable, increasing loss rate

Method used

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  • Method for recycling and granulating secondary materials of high-performance glass fiber reinforced flame-retardant polybutylene adipamide
  • Method for recycling and granulating secondary materials of high-performance glass fiber reinforced flame-retardant polybutylene adipamide
  • Method for recycling and granulating secondary materials of high-performance glass fiber reinforced flame-retardant polybutylene adipamide

Examples

Experimental program
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Effect test

Embodiment 1～7

[0037] The following examples 1 to 7 all adopt the following method to recycle and granulate the secondary material of high-performance glass fiber reinforced flame-retardant PA46:

[0038] (1) Crushing the secondary materials to be recycled (including secondary materials or unqualified parts produced during the injection molding process of glass fiber reinforced flame-retardant PA46) to obtain granular secondary materials to be recycled; When recycling the secondary material for crushing, the sealed medium-speed crushing method of 100 kg / hour can be used, and the length of the obtained granular secondary material to be recovered is less than or equal to 4cm;

[0039] (2) Put the granular secondary material to be recovered into the metal separator, and screen out the metal chips; when sieving the metal chip from the granular secondary material to be recovered, use the metal separator to separate it for 1 to 3 times , the separation speed is 50-200 kg / hour;

[0040] (3) After ...

Embodiment 1

[0046] According to the above method, after crushing 200 kg of the secondary material to be recovered (GFFRPA46), put the granular secondary material to be recovered into the metal separator, screen out the metal chips, and extrude it through a single-rod extruder. The screw diameter of the single-screw extruder is 45mm, the length-to-diameter ratio is 18:1, the screw compression ratio is 3.0, the number of die holes: 2 holes, the die hole diameter is 3.0mm, and the extrusion temperatures are 305°C and 305°C, respectively. 310°C, 315°C, 310°C, the head temperature of the single-screw extruder is 310°C. The screw speed is 85rpm; the strands are cooled to about 120°C by the air-cooled conveyor belt, and then pelletized by the pelletizer. The obtained GFFRPA46 pellets (that is, the obtained recycled pellets) and the extrusion process are broken and agglomerated. The GFFRPA46 material cannot be pelletized and weighed. Weigh 15 kg of GFFRPA46 pellets and dry them at 120°C for 4 hou...

Embodiment 2

[0048] According to the above method, after crushing 200 kg of the secondary material to be recovered (GFFRPA46), put the granular secondary material to be recovered into the metal separator, screen out the metal chips, and extrude it through a single-rod extruder. The screw diameter of the single-screw extruder is 45mm, the length-to-diameter ratio is 25:1, the screw compression ratio is 3.1, the number of die holes: 2 holes, the die hole diameter is 3.5mm, and the extrusion temperatures are 305°C and 305°C, respectively. 310°C, 315°C, 310°C, the head temperature of the single-screw extruder is 310°C, and the screw speed is 115rpm; the strands are water-cooled and then pelletized by a pelletizer to obtain GFFRPA46 pellets (that is, the obtained Recycling pellets) and the extrusion process, the GFFRPA46 pellets cannot be pelletized due to broken bars and agglomerates, and weighed. The GFFRPA46 pellets of 15 kg were dried at 120°C for 4 hours, and injection molded into various p...

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Abstract

The invention discloses a method for recycling and granulating high-performance glass fiber-reinforced flame-retardant polybutylene adipamide secondary materials. The secondary materials or unqualified parts produced in the injection molding process of glass fiber-reinforced flame-retardant PA46 materials are broken and screened. In addition to metal shavings, it is extruded by a single-screw extruder. The processing temperature is 295~330 ° C. It is conveyed by a metal chain. After the material is cooled, it is cut into pellets to obtain recycled pellets. In this method, the shearing effect of the single-screw extruder is weak, and the secondary material to be recycled is only subjected to a weak shearing effect during the plasticization process, so the length of the glass fiber can maintain a relatively long value, and the damage of the PA46 polymer segment is reduced. Compared with twin-screw extrusion granulation, its mechanical properties and heat resistance maintain better values: the maximum decrease in mechanical properties does not exceed 10%, the decrease in heat distortion temperature does not exceed 2.6°C, and the loss rate of granulation is less than 10%. Higher than 1.2%, can improve the utilization rate of glass fiber reinforced flame retardant PA46 secondary material.

Description

technical field [0001] The invention relates to the processing technology of high-temperature-resistant engineering plastics, in particular to a method for recycling and granulating secondary materials of high-performance glass fiber-reinforced flame-retardant polybutylene adipamide (PA46). Background technique [0002] Polybutylene adipamide (PA46) is an aliphatic polyamide formed by the polycondensation of butylenediamine and adipic acid. It was first industrially produced by the Dutch DSM company in 1989. The company's current PA46 output is about 25kt / a. Although it has a molecular structure similar to that of nylon 66, PA46 has more amide groups per given chain length, the lowest content of methylene and amide groups, and a more symmetrical chain structure; the highly symmetrical chain structure leads to its crystallization High temperature (45% ~ 70%), and fast crystallization speed, so the melting point is higher (295°C), the heat distortion temperature is also high, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B9/06B29B13/10B29C47/92B29C47/60B29C47/10B29C47/88B29C48/04B29C48/92
CPCB29C48/397B29C48/92B29C48/04
Inventor 张水洞蒋果冯健
Owner 深圳市磐汩新材料有限公司
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