Method for improving impact performance of MCA flame-retardant PA66

A technology of impact performance and three-thread thread, which is applied in the field of improving the impact performance of MCA flame-retardant PA66, can solve the problems of high MCA addition, affecting material toughness, and insufficient dispersion of flame retardants, so as to achieve toughness improvement, sufficient dispersion, and reduction Effect of Manufacturing Cost and Formulation Cost

Pending Publication Date: 2021-10-22
JINYOUNG XIAMEN ADVANCED MATERIALS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of MCA added in this method is very high, which will seriously affect the toughness of the material
The second is the problem of material toughness. The lack of material toughness is mainly due to insufficient dispersion of MCA flame retardants. Usually, the unnotched impact strength can only reach 48-55J / m (ASTM D6110)

Method used

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  • Method for improving impact performance of MCA flame-retardant PA66
  • Method for improving impact performance of MCA flame-retardant PA66
  • Method for improving impact performance of MCA flame-retardant PA66

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The screw of a twin-screw extruder consists of threaded elements. The used screw elements and their specifications are shown in Table 2

[0037] Table 2. Specifications of threaded components

[0038]

[0039] 1) In "K45 / 5 / 72", 45 refers to the kneading disc corner, 5 refers to 5 kneading discs, 72 refers to the total length of the element is 72mm, and others are similar;

[0040] 2) In "72 / 72", the pitch of the first 72 fingers is 72mm, the length of the last 72 fingers is 72mm, and the others are similar;

[0041] 3) In ""44 / 22L", L" refers to left-handed threaded components, and others are similar;

[0042] 4) In "K45 / 5 / 56 3Fe", 3Fe refers to three-start threaded components; "N-3Fe" and "3Fe-N" in the table refer to transitional components to double-started threaded components.

[0043] Table 3. Screw combination and extrusion process before and after adjustment

[0044]

[0045] "X2" and "X3" respectively indicate that there are two or three components.

...

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Abstract

The invention discloses a method for improving the impact performance of MCA flame-retardant PA66. The method comprises the following steps: 1) preparing raw materials according to a ratio; and (2) putting the raw materials into a double-screw extruder for melting and mixing, and carrying out extruding and granulating, wherein the length-diameter ratio of screws of the double-screw extruder is (40-44): 1, the temperature of a screw cylinder is 260-270 DEG C, and the rotating speed of the screws is 400-450 rpm. Each screw of the double-screw extruder is provided with main threads in the whole process and sequentially comprises a feeding section, a plasticizing section, a mixing section, an exhausting section and an extruding section, wherein three-head thread elements are arranged in the plasticizing section and the mixing section correspondingly. According to the method, the impact performance of the MCA flame-retardant PA66 can be improved by more than 100%.

Description

technical field [0001] The invention relates to a method for improving the impact performance of MCA flame-retardant PA66 (polyamide 66). Background technique [0002] Polyamide resin has excellent comprehensive properties such as good heat resistance, wear resistance, mechanical properties, barrier properties, and chemical corrosion resistance, and is widely used in electric tools, electronic appliances, connectors and other fields. But the flame retardant grade of ordinary PA66 can only reach V-2. In order to improve the flame retardancy, MCA (melamine cyanurate) flame retardant is usually added. [0003] The application of MCA flame retardant PA66 products needs to solve two key problems: the first is the problem of flame retardant V0 grade, with polyamide as the matrix and melamine cyanuric acid as the flame retardant, generally adding more than 6% can obtain V0 flame retardant grade MCA flame retardant polyamide composite. However, the amount of MCA added in this met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C48/655B29B9/06B29K77/00
CPCB29C48/655B29C48/022B29B9/06B29K2077/00
Inventor 赖吉林杨杰黄熠高文勇
Owner JINYOUNG XIAMEN ADVANCED MATERIALS TECH CO LTD
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