FLAME-RETARDANT NYLON COMPOSITE AND USE THEREOF

Abstract

The present invention relates to a flame-retardant nylon composite and use thereof, including components: 55 parts to 80 parts of a nylon resin; 1 part to 30 parts of a red phosphorus; and 0.01 part to 2 parts of a phenolic substance. According to the present invention, by adding a small amount of the phenolic substance to the red phosphorus flame-retardant nylon composite, phosphorus precipitation can be effectively inhibited, and a phosphine precipitation amount can be reduced to 30 ppm or less, while good electrical performances can be maintained, which is applicable in fields of connectors, contactors, etc. in electronic appliances.

Claims

1. A flame-retardant nylon composite, comprising the following components in parts by weight: 55 parts to 80 parts of a nylon resin; 1 part to 30 parts of a red phosphorus; and 0.01 part to 2 parts of a phenolic substance.

2. The flame-retardant nylon composite according to claim 1, wherein the phenolic substance is one or more of 2,5-di-tert-butylhydroquinone, o-methylhydroquinone, and 2-methylphenol.

3. The flame-retardant nylon composite according to claim 1, wherein the nylon resin is one or more of PA66, PA6/10 and PA6/66.

4. The flame-retardant nylon composite according to claim 1, wherein the red phosphorus is a red phosphorus powder, having an average particle diameter of not more than 300 μm.

5. The flame-retardant nylon composite according to claim 1, wherein 8 parts to 55 parts of a glass fiber is further comprised in parts by weight; at least one type of the glass fibers from the following group is used: E glass, H glass, R,S glass, D glass, C glass and quartz glass.

6. The flame-retardant nylon composite according to claim 1, wherein 1 part to 5 parts of one or more of a nucleating agent, an antistatic agent, and a lubricant is further comprised in parts by weight.

7. Use of the flame-retardant nylon composite according to claim 1 in electronic appliances.

8. Use of a phenolic substance in improving red phosphorus precipitation in a flame-retardant nylon composite.

9. The use according to claim 8, wherein the phenolic substance is one or more of 2,5-di-tert-butylhydroquinone, o-methylhydroquinone, and 2-methylphenol.

10. The use according to claim 8, wherein an additive amount of the phenolic substance is 0.01 part to 2 parts based on a total weight of the flame-retardant nylon composite.

11. The flame-retardant nylon composite according to claim 4, the average particle diameter of the red phosphorus powder is 1 μm to 100 μm.

12. The flame-retardant nylon composite according to claim 5, wherein the glass fiber made of E glass is used.

13. Use of the flame-retardant nylon composite according to claim 2 in electronic appliances.

14. Use of the flame-retardant nylon composite according to claim 3 in electronic appliances.

15. Use of the flame-retardant nylon composite according to claim 4 in electronic appliances.

16. Use of the flame-retardant nylon composite according to claim 5 in electronic appliances.

17. Use of the flame-retardant nylon composite according to claim 6 in electronic appliances.

Description

DESCRIPTION OF THE EMBODIMENTS

[0018] The following embodiments are given to specifically describe the present invention, but the present invention is not limited thereto.

[0019] Raw materials used in Embodiments and Comparative Examples are now illustrated as follows, but the present invention is not limited to these materials:

[0020] PA66-a: PA66 50FWFS, industrial grade, ASCEND LLC;

[0021] PA66-b: 21ZLV, industrial grade, ASCEND LLC;

[0022] red phosphorus: RPM440B, with an average particle diameter is 40 μm, China Bluestar Chengrand Co., Ltd;

[0023] 2,5-di-tert-butylhydroquinone: Aladdin Reagent (Shanghai) Co., Ltd;

[0024] o-methylhydroquinone: Aladdin Reagent (Shanghai) Co., Ltd;

[0025] silver powder, with a purity of 99.99% and a particle diameter of less than 0.1 μm, Aladdin Reagent (Shanghai) Co., Ltd;

[0026] zinc oxide: with a purity of 99.99%, metals basis, Aladdin Reagent (Shanghai) Co., Ltd.;

[0027] zinc borate: anhydrous zinc borate, with a particle diameter of 20 μm to 30 μm, Aladdin Reagent (Shanghai) Co., Ltd.; and

[0028] glass fiber: ECS301HP-3, Chongqing Polycomp International Corp.

[0029] Performance Test Methods:

[0030] Comparative Tracking Index (CTI): tested according to the IEC60112-2003 standard.

[0031] Phosphorous precipitation amount: between platinum electrodes with a specified size, a certain voltage was applied, and a droplet of contaminated liquid (0.1% ammonium chloride) with a specified droplet volume was dripped at a determined height (30 mm) for determined time (30 s), phosphorous precipitation amount (ppm): deionized water, 2 g of a silver sheet, 2 g of a copper sheet and 6 g of red phosphorous particles were placed in an 80° C. oven respectively for 3 days, then the copper sheet and the silver sheet were washed with 100 ml of 0.1 mol/L hydrochloric acid solution, and a phosphorous content in the hydrochloric acid solution was determined by ICP-AES.

Embodiments 1 to 8 and Comparative Examples 1 to 3

[0032] Each raw material was weighed according to the ratios in Table 1, premixed in a high-speed mixer to obtain a premix, and then the premix was put into a twin-screw extruder for melt mixing, and granulated by extrusion to obtain the flame-retardant nylon composite; wherein the twin-screw extruder had a screw L/D ratio being 40:1 to 48:1, a screw barrel temperature being 250° C. to 270° C., and a screw rotation speed being 200 rpm to 550 rpm.

[0033] The composite prepared in each Embodiment and Comparative Example above was first injection-molded into a standard strip for testing according to a standard size, and then each performance test was carried out. Performance test data for each test sample are shown in Table 1.

TABLE-US-00001 TABLE 1 Specific ratios (parts by weight) of each component for each Embodiment and Comparative Example Comparative Comparative Comparative Embodiment Embodiment Embodiment Embodiment Example 1 Example 2 Example 3 1 2 3 4 PA66-a 60 60 60 60 65 60 60 RPM440B 12 12 12 12 10 13 13 Zinc borate 0.3 O-methylhydroquinone 0.5 0.5 0.8 0.3 2,5-di-tert- 0.5 0.3 butylhydroquinone Silver 0.1 Zinc oxide 0.1 Glass fiber 25 25 25 25 25 25 25 ECS301HP-3 CTI (V) 350 325 275 355 365 360 350 Phosphorus 155 75 35 28 23 27 29 precipitation amount (ppm) Embodiment 5 Embodiment 6 Embodiment 7 Embodiment 8 PA66-b 60 60 60 43 RPM440B 9 12 13 7 O-methylhydroquinone 0.2 2,5-di-tert- 1.2 1 1.5 0.2 butylhydroquinone Glass fiber 30 25 25 50 ECS301HP-3 CTI (V) 400 375 350 300 Phosphorus 29 16 23 30 precipitation amount (ppm)

[0034] It can be seen from the results in Table 2 that according to the present invention, by adding a small amount of a phenolic substance to the red phosphorus flame-retardant nylon composite, phosphorus precipitation can be effectively inhibited and a phosphine precipitation amount can be reduced to 30 ppm or less, while good electrical performances can be maintained.