Homopolymer and copolymer of long-carbon-chain semi-aromatic high-temperature-resistant polyamide and synthesis method thereof

Abstract

The invention provides a method for synthesizing a homopolymer and a copolymer of long-carbon-chain semi-aromatic high-temperature-resistant polyamide and polymerization products obtained by the method. The method comprises the following steps of: (a) prepolymerizing terephthalic acid and 1,10-decanediamine in a molar ratio of 1:(1.00-1.02) and optional copolymerization components to obtain a prepolymer that the intrinsic viscosity is controlled to be between 0.4 and 1.1dl / g; and (b) performing solid-phase polymerization on the prepolymer in step (a) to obtain the long-carbon-chain semi-aromatic high-temperature-resistant polyamide PA10T or the copolymer thereof, wherein the intrinsic viscosity is controlled to be between 1.2 and 2.6dl / g.

Description

technical field [0001] The invention relates to a polyamide material, in particular to a long carbon chain semi-aromatic high temperature resistant polyamide PA10T and a synthesis method thereof. Background technique [0002] High temperature resistant polyamide is a member of the polyamide family. It has high temperature resistance due to its molecular structure containing benzene ring or other aromatic ring structure. It is usually composed of aliphatic, alicyclic diacid or diamine and aromatic It can also be obtained by polycondensation of three or more diacid / diamine monomers according to performance requirements. Semi-aromatic polyamide has become the main product of high temperature resistant nylon due to its superior physical and mechanical properties compared with aliphatic polyamide and unparalleled processing performance of aromatic polyamide. Representative products include DuPont's HTN series (PA6T / 66, etc. ), Kuraray's PA9T, Mitsubishi Gas's MXD6, DSM's PA46 an...

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Problems solved by technology

However, the selection of organic solvents will greatly increase production costs and involve the problem of solvent recovery, which is extremely challenging for industrial production and is also very detrimental to environmental protection. If green and environmentally friendly solvents are used on the basis of meeting the same performance requirements The production of PA10T by this method has more important significance; in addition, the prepolymer with relatively low intrinsic viscosity will bring a great burden to the later solid-phase polymerization, and the molecular weight distribution of the product after polymerization will be relatively wide, and the required physical properties must be achieved. Mechanical properties require a longer solid-state polymerization time. Although the solid-state polymerization reaction temperature is relatively low, long-term reaction will also bring about the problem of color tone, which is the so-called time-temperature equivalent

[0007] Although Mitsui Chemicals Co., Ltd. once described the synthesis of PA10T in JP2002-293926, most of its work is carried out for compositions and modified materials. The prepolymer obtained in this patent also undergoes solid-state polymerization and melting The polymerization method after two steps of polymerization to increase the molecular weight of PA10T requires at least 70 hours for the whole process, the production cost is very high, and there are also the problems in WO 2009 / 079886A1

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