A kind of polyamide, its preparation method and a kind of metal joint
A technology of aliphatic polyamide and polyether diamine, which is applied in the field of polymer materials, can solve the problems of reducing the melt viscosity of polyamide resin compositions, low glass transition temperature of polyamide elastomers, and ineffective effects, etc.
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Embodiment 1
[0162] 210.4g hexamethylenediamine, 375.0g sebacic acid, 25.9g ED-600 (Mn=600) and 160 g of deionized water were added into the reactor, and the reactor was sealed and replaced with nitrogen three times. Heating was started after the heater temperature of the reactor was set to 180°C, and the heater temperature was set to 270°C 2 hours later. When the pressure in the reactor reaches 1.75MPa, the water vapor in the reactor is released through the vent valve while the pressure in the reactor is maintained at 1.75MPa until the temperature in the reactor rises to 250°C. When the temperature in the kettle reaches 250°C, reduce the set temperature of the heater to 260°C, and gradually reduce the pressure in the kettle from 1.75MPa to normal pressure within 1 hour (the temperature in the kettle is 260°C when reaching normal pressure). After the pressure was lowered to normal pressure, a nitrogen flow was introduced into the kettle, and melt polymerization was carried out for 10 min...
Embodiment 2 and 3、 comparative example 1-3
[0164] Except that the change of the raw material according to the change shown in Table 1 and the nitrogen passage time as shown in Table 1 after the pressure in the kettle reaches normal pressure, other operations are the same as in Example 1. The properties of the obtained nylon 610 are shown in Table 1.
[0165] Table 1
[0166]
[0167] Comparing Examples 1-3 with Comparative Example 1, it can be seen that the melt viscosity of nylon 610 containing 5.1 wt% polyether diamine block is only the same as that of nylon 610 without polyether diamine block with the same weight average molecular weight The melt viscosity of the homopolymer is 8-9%, and there is no difference in crystallinity and mechanical properties. In addition, it can be seen from Comparative Example 2 that when the number-average molecular weight of the polyether diamine block is less than 500, the crystallization temperature, melting point and mechanical properties of the polyamide resin all decrease sign...
Embodiment 4-6、 comparative example 4 and 5
[0169] Except the change shown in Table 2 of the raw material and the nitrogen passage time shown in Table 2 after the pressure in the kettle reaches normal pressure, other operations are the same as in Example 1. The properties of the obtained nylon 610 are shown in Table 2.
[0170] Table 2
[0171]
[0172] Compared with Comparative Example 4 with a lower polyetherdiamine block content (0.1 wt%), the melt viscosity drops in Example 2 and Examples 4-6 are more obvious. Compared with Comparative Example 5 with higher polyether diamine block content (20 wt%), Example 2 and Examples 4-6 maintained the same crystallinity and mechanical properties as Comparative Example 1.
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