A kind of calcium sulfate W-Gum nylon 66 composite material and preparation technology thereof
Technical field
The present invention relates to a kind of calcium sulfate W-Gum nylon 66 composite material and preparation technology thereof.
Background technology
Nylon 66(PA66) high melt point is arranged, it is a kind of semi-crystalline-crystalline material, PA66 also can keep stronger strength and stiffness at comparatively high temps, therefore, it is widely used in the part of manufacturing machine, automobile, chemistry and electrical means, as impeller, fan blade, high pressure seal in gear, roller, pulley, roll shaft, the pump housing enclose, valve seat, pad, lining, various handle, bracing frame, electric wire covering etc., also can be made into film as wrapping material, in addition, also can be used for making medicine equipment, sports goods, daily necessities etc.; But nylon 66 shock strengths are low, poor toughness, and the product shrinking percentage is big, still has water absorbability after the moulding, and this has also limited its range of application.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes the deficiencies in the prior art, and a kind of intensity height is provided, good toughness, and shrinking percentage is little, is difficult for the calcium sulfate W-Gum nylon 66 composite material and the preparation technology thereof of moisture absorption.
The present invention's calcium sulfate W-Gum nylon 66 composite material is made by following raw materials by weight percent: calcium sulfate 15-50wt%, W-Gum 10-40wt%, nylon 66(PA66) 20-60wt%, thermo-stabilizer T-68 1-10wt%, antioxidant 1010 1-10wt%, stearic acid 1-20wt%.
Preferred weight percent is: calcium sulfate 15-20wt%, W-Gum 15-20wt%, nylon 66(PA66) 55-60wt%, thermo-stabilizer T-68 2wt%, antioxidant 1010 3wt%, stearic acid 5wt%.
The preparation technology of the present invention's calcium sulfate W-Gum nylon 66 composite material may further comprise the steps:
(1) calcium sulfate is pulverized, crossed 100 mesh sieves, place baking oven dry 23-25 hour (preferred 24 hours) under the temperature of 105-115 ℃ (preferred 110 ℃); Dry back adds in the high-speed mixer, adds antioxidant 1010 and stearic acid, mixes 10-20 minute (preferred 15 minutes) down at 45-55 ℃ (preferred 50 ℃);
(2) nylon 66 is placed the dry 25-35 of vacuum drying oven minute (preferred 30 minutes) of 80-90 ℃ (preferred 85 ℃);
(3) will mix 15-25 minute (preferred 20 minutes) in W-Gum, thermo-stabilizer T-68 and step (1) gained mixture, step (2) the gained exsiccant nylon 66 adding high-speed mixers;
(4) place forcing machine to extrude in step (3) gained mixture, granulation.
The present invention uses stearic acid that calcium sulfate is carried out modification, improves the consistency of itself and starch, and stearic acid improves the flowability of melt and the surface flatness of matrix material as lubricant simultaneously.Calcium sulfate, W-Gum good dispersion in nylon 66 among the present invention, the fluidity of molten of matrix material is good.
The present invention's calcium sulfate W-Gum nylon 66 composite material, the intensity height, good toughness, shrinking percentage is little, is difficult for moisture absorption, can replace natural timber to be used for fields such as indoor and outdoor decoration, construction industry.
Embodiment
Below in conjunction with specific embodiment the present invention is described in further detail.
Each embodiment raw material weight proportioning sees Table 1.
Each embodiment starting material provider is as follows:
Calcium sulfate, Hebei Xingtai Shuanghua Plaster Products Co., Ltd.;
W-Gum, the farsighted development in science and technology company limited that reaches of Wuhan dragon;
PA66, Dupont FE5480HS BK, golden prosperous plastic material company limited;
Thermo-stabilizer T-68, happy chemical industry company limited is matched in Hangzhou;
Antioxidant 1010, Nanjing Jia Yin Science and Technology Ltd.;
Stearic acid, the Shanghai card is won industry and trade company limited.
The preparation method:
(1) calcium sulfate is pulverized, crossed 100 mesh sieves, place baking oven under 110 ℃ temperature dry 24 hours; Dry back adds in the high-speed mixer, adds antioxidant 1010 and stearic acid, mixes 15 minutes down at 50 ℃;
(2) nylon 66 is placed 85 ℃ dry 30 minutes of vacuum drying oven;
(3) will mix 20 minutes in W-Gum, thermo-stabilizer and step (1) gained mixture, step (2) the gained exsiccant nylon 66 adding high-speed mixers;
(4) step (3) gained mixture is poured into placed forcing machine to extrude, granulation.
Each embodiment product performance detects, and tensile strength is pressed the standard testing of GB/T 1040-92 prescriptive procedure; Flexural strength is pressed GB/T 1936. 1-1991 prescriptive procedure standard testings; Shock strength is pressed the standard testing of GB/T 1043-93 prescriptive procedure; Elongation at break is pressed the test of GB/T17200-1997 prescriptive procedure; Water absorbability by formula
Test, Q is rate of moisture absorption %, and G is heavy (g) after the sample moisture absorption, and U is sample initial weight (g); Shrinking percentage is pressed the standard testing of GB/T 15585-1995 prescriptive procedure.
Table 1 embodiment 1-5 raw material weight proportioning
? |
Embodiment 1 |
Embodiment 2 |
Embodiment 3 |
Embodiment 4 |
Embodiment 5 |
Calcium sulfate (kg) |
15 |
15 |
20 |
20 |
20 |
W-Gum (kg) |
15 |
20 |
15 |
20 |
25 |
PA66(kg) |
60 |
55 |
55 |
50 |
45 |
Thermo-stabilizer T-68(kg) |
2 |
2 |
2 |
2 |
2 |
Antioxidant 1010 (kg) |
3 |
3 |
3 |
3 |
3 |
Stearic acid (kg) |
5 |
5 |
5 |
5 |
5 |
Table 2 embodiment 1-5 product performance detected result relatively
? |
Tensile strength (MPa) |
Flexural strength (MPa) |
Shock strength (KJ/m
2)
|
Elongation at break (%) |
Water absorbability (%) |
Shrinking percentage (%) |
Embodiment 1 |
78.4 |
110.6 |
92.4 |
5.7 |
0.5 |
0.4 |
Embodiment 2 |
75.1 |
105.8 |
91.7 |
5.3 |
0.3 |
0.5 |
Embodiment 3 |
74.3 |
106.3 |
84.6 |
5.1 |
0.6 |
0.3 |
Embodiment 4 |
70.9 |
97.8 |
82.8 |
4.7 |
1 |
1 |
Embodiment 5 |
68.4 |
96.9 |
76.4 |
4.2 |
3 |
1.5 |