CN-120518853-B - Long-chain polyamide resin easy to process and high in tensile property, and preparation method and application thereof

CN120518853BCN 120518853 BCN120518853 BCN 120518853BCN-120518853-B

Abstract

The invention belongs to the field of engineering plastics, and particularly relates to a long-chain polyamide resin with easy processing and high tensile property, and a preparation method and application thereof. The composition comprises the following raw material components of a component a, a component b and a component c, wherein the component a is an aliphatic carboxylic acid compound component, the component b is a polyamine compound component, and the component c is a compound formula with a structure shown as a formula (1), wherein n and m can be any number between 1 and 10. The long-chain polyamide resin reduces the crystallinity of the material by introducing the structure diacid with an asymmetric benzene ring structure, improves the mechanical property of the polyamide material by introducing the benzene ring structure, and ensures the mechanical property of the polyamide material while realizing low processing temperature from the polyamide material component per se to reduce the energy consumption. Solves the problem that the processing temperature, the mechanical property and the processing energy consumption of the polyamide material are difficult to be compatible in the prior art.

Inventors

LIU XUE
SUN WENSHUAI
BAI YAN
LIU ZHENGUO
DANG DONGBIN
Wang Luchong

Assignees

河南大学

Dates

Publication Date: 20260508
Application Date: 20250425

Claims (5)

1. The long-chain polyamide resin with easy processing and high tensile property is characterized by comprising the following raw material components: the component a is aliphatic carboxylic acid compounds, wherein the aliphatic carboxylic acid compounds are dodecanedioic acid; the component b is polyamine compound, wherein the polyamine compound is decanediamine; And the component c is one or more selected from benzyl succinic acid, 4-carboxymethyl benzoic acid and 3- (4-carboxyphenyl) propionic acid, and the molar quantity of carboxyl contained in the component c accounts for 25-50% of the molar quantity of carboxyl contained in the total component.
2. A process for preparing a long chain polyamide resin of claim 1 which is easy to process and has high tensile properties, comprising the steps of: Step 1, dissolving a component a and a component C into an organic solvent, heating, adding a component b after the temperature is increased to 60-100 ℃, and reacting for 20-60min at the temperature to obtain a polyamide prepolymer; Step 2, stirring and mixing the polyamide prepolymer obtained in the step 1 and a polymerization inhibitor to obtain a mixture, heating the mixture under the protection of inert gas, raising the reaction temperature to 180 ℃, preserving heat for 30min, raising the reaction temperature to 210 ℃, reacting for 0-3h at the temperature, raising the temperature to 230 ℃ and reacting for 4-7h at the temperature to obtain the long-chain polyamide resin.
3. The method for preparing a long-chain polyamide resin with easy processing and high tensile properties according to claim 2, wherein the organic solvent is one selected from the group consisting of ethanol, tetrahydrofuran, acetone and methylene chloride.
4. The method for producing a long-chain polyamide resin having easy processability and high tensile properties according to claim 2, wherein said polymerization inhibitor is one selected from the group consisting of hydroquinone, tetrachlorobenzoquinone and N-allylamide.
5. Use of a long-chain polyamide resin according to claim 1 or obtained by the process according to any one of claims 2 to 4 in flexible electronic materials or pipes.

Description

Long-chain polyamide resin easy to process and high in tensile property, and preparation method and application thereof Technical Field The invention belongs to the field of engineering plastics, and particularly relates to a long-chain polyamide resin with easy processing and high tensile property, and a preparation method and application thereof. Background The long-chain polyamide resin is widely applied to the fields of automobiles, electronics, textiles, engineering plastics and the like due to the excellent mechanical property, heat resistance and chemical stability. However, although the conventional polyamide material has good mechanical properties, the processing temperature is high due to the inherent high crystallinity and hydrogen bond network, and more energy consumed for production is one of the factors causing the high cost. At the same time, this is also a major constraint in the context of increasingly intense resources and increasingly important environmental protection. In order to solve the above problems, researchers have proposed a solution to change processability by improving the molecular structure of polyamide. For example, in patent CN 118930845A, a polybasic cyclic amine compound is introduced into a polyamide resin to form a high-performance polyamide having high hydrogen bond density and crystallinity, the softening point of the polyamide is increased compared with the softening temperature without addition, the mechanical strength is increased, and the reduction of the processing energy consumption is not realized. The blending of polyamide and polyester in patent US3553288a reduces the melting point of the material and ensures the mechanical properties of the material, but in practice no reduction in the processing energy is achieved, but rather a further increase in energy consumption is caused by the physical blending. It is therefore a technical problem how to achieve low processing temperatures from the polyamide material components themselves to reduce the energy consumption while ensuring that the mechanical properties of the polyamide material remain unchanged. Disclosure of Invention In order to solve the problem that the processing temperature, the mechanical property and the processing energy consumption of the polyamide material are difficult to be compatible in the prior art, the invention provides a long-chain polyamide resin which is easy to process and has high tensile property, and a preparation method and application thereof. In order to solve the problems, the technical scheme of the invention is as follows: in a first aspect of the present invention, there is provided a long chain polyamide resin which is easy to process and has high tensile properties, comprising the following raw material components: Component a, aliphatic carboxylic acid compound Component b polyamine compound Component c A compound having a structure represented by the following formula (1) The, formula (1) In the formula (1), n and m may be any number between 1 and 10. Preferably, said component c is selected from one or more of benzyl succinic acid, 4-carboxymethyl benzoic acid, 3- (4-carboxyphenyl) propionic acid. 4-carboxymethylbenzoic acid is preferred. Wherein 4- (carboxymethyl) benzoic acid, 3- (4-carboxyphenyl) propionic acid belong to the specific compound of formula (II) in the component c formula (1), and the sulfosuccinic acid belongs to the specific compound of formula (III) in the component c formula (1). Preferably, the molar amount of carboxyl groups contained in group c) is 25% to 100% of the molar amount of carboxyl groups contained in the total component. The range can also be 25% -50% and 50% -100%. Preferably, 25% -50%. The molar ratio of carboxyl groups contained in group c) of the present invention to carboxyl groups contained in the total component affects the processing temperature and material properties of the material. The density and strength of hydrogen bonds in the polyamide are regulated and controlled by introducing the structure diacid with an asymmetric benzene ring structure, then the crystallinity of the material is reduced by utilizing the asymmetric structure, and meanwhile, the mechanical property of the polyamide material is improved by introducing the benzene ring structure, so that the processing temperature of the polyamide is reduced, and the mechanical property of the material is kept unchanged or even improved. Preferably, the aliphatic carboxylic acid compound is selected from one or more of adipic acid, glutaric acid or dodecanedioic acid. Preferably, the polyamine compound is selected from one or more of pentanediamine, hexanediamine or decanediamine. In a second aspect, the present invention provides a method for preparing a long-chain polyamide resin having easy processing and high tensile properties, comprising the steps of: Step 1, dissolving a component a and a component C into an organic solvent, heating, adding a component b after