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A kind of semi-aromatic polyamide and molding composition thereof

A technology of semi-aromatic polyamide and caprolactam, which is applied in the field of engineering plastics, can solve problems such as the difficulty of terephthalic acid reaction, and achieve the effect of good appearance, no lowering of melting point and smooth material strip

Active Publication Date: 2020-09-15
成都升宏新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the problem of difficult reaction of common monomer terephthalic acid, the present invention provides a semi-aromatic polyamide, which is formed by condensation of phthalic acid and diaminobenzene monomer, the reaction is easier to control, and has excellent temperature resistance and low water absorption

Method used

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  • A kind of semi-aromatic polyamide and molding composition thereof

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preparation example Construction

[0038] Process for the preparation of semi-aromatic polyamides

[0039] Add the reaction raw materials into the autoclave according to the ratio in Table 1, then add benzoic acid, zinc acetate and deionized water, and start the stirring device. Vacuumize and fill with nitrogen, repeat 3 times, get rid of the air in the reactor. Heat to 280°C, at this time the pressure will rise to 2.7MPa, maintain this pressure for 3 hours by releasing water vapor, then release the pressure to 0.5MPa, raise the temperature to 320°C and continue the reaction for 4 hours. Raise the temperature to 340°C, pressurize to 0.7MPa with nitrogen, and discharge to obtain a semi-aromatic nylon product.

Embodiment 9

[0041]Mix 1kg of PA66 salt, 166g of terephthalic acid, 108g of p-phenylenediamine, 1g of benzoic acid, and 0.5g of sodium hypophosphite catalyst into the autoclave, add 1kg of deionized water, and start the stirring device. Vacuumize and fill with nitrogen, repeat 3 times, get rid of the air in the reactor. Heat to 300°C, at this time the pressure will rise to 2.7MPa, maintain this pressure for 3 hours by releasing water vapor, then release the pressure to 0.5MPa, raise the temperature to 320°C and continue the reaction for 4 hours. Raise the temperature to 340°C, pressurize to 0.7MPa with nitrogen, and discharge to obtain a semi-aromatic nylon product.

Embodiment 10

[0043] Mix 1 kg of caprolactam, 215.8 g of terephthalic acid, 140.4 g of p-phenylenediamine, 1 g of benzoic acid, and 1 g of sodium hypophosphite catalyst into the autoclave, and start the stirring device. Vacuumize and fill with nitrogen, repeat 3 times, get rid of the air in the reactor. Heated to 300°C, reacted for 3 hours, then raised the temperature to 320°C and continued to react for 4 hours. Raise the temperature to 340°C, pressurize to 0.7MPa with nitrogen, and discharge to obtain a semi-aromatic nylon product.

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Abstract

The invention provides semi-aromatic polyamide. The semi-aromatic polyamide comprises condensed monomer of phthalic acid and diaminobenzene, the two kinds of monomer account for 15-60 mol% of total monomer, and the semi-aromatic polyamide furthermore comprises the following condensed monomer: 0-85 mol% of aromatic or aliphatic amino acid containing 2-20 carbon atoms, 0-85 mol% of lactam containing2-20 carbon atoms, 0-50 mol% of aromatic or aliphatic diamine containing 2-20 carbon atoms and 0-50 mol% of aromatic or aliphatic dicarboxylic acid containing 2-20 carbon atoms. The semi-aromatic polyamide is synthesized from the phthalic acid and diaminobenzene monomer, reaction is more easy to control, and meanwhile, the semi-aromatic polyamide has excellent temperature resistance and low waterabsorption.

Description

technical field [0001] The invention relates to the technical field of engineering plastics, in particular to a semi-aromatic polyamide resin synthesized from phthalic acid and diaminobenzene monomers. [0002] technical background [0003] Polyamide (nylon) is currently the most widely used thermoplastic engineering plastic. It has excellent strength and toughness, as well as excellent wear resistance, fatigue resistance, corrosion resistance, and oil resistance. It is widely used in electronic appliances, automobiles, machinery, and textiles. and other industries. Since its inception, the amount of nylon has continued to grow in the fierce competition of various materials, ranking first in the amount of five major engineering plastics. [0004] With the design of various parts becoming more and more integrated and miniaturized, and the temperature of their use environment is getting higher and higher, the traditional PA6 and PA66 have become more and more difficult to meet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/26C08G69/28C08G69/36C08L77/00C08L77/06
Inventor 李洋
Owner 成都升宏新材料科技有限公司
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