High-strength PBT (polybutylene terephthalate) fiber material and preparation method thereof

Abstract

The invention relates to the technical field of PBT fibers, and particularly discloses a high-strength PBT fiber material and a preparation method thereof. The PBT fiber material comprises the following raw materials in parts by weight: 60-75 parts of PBT resin, 10-20 parts of a plasticizer, 2-5 parts of a compatilizer, 1-3 parts of an antioxidant and 10-15 parts of a flexibilizer. The preparation method comprises the following steps: uniformly mixing the PBT resin with the plasticizer, the compatilizer, the antioxidant and the flexibilizer, carrying out high-temperature melting, cooling, extruding and granulating, and carrying out melting, spinning and winding on the mixed raw materials to obtain the PBT fiber composite material. The PBT fiber composite material disclosed by the invention has the advantages of improving the strength and the elastic recovery rate of the PBT fiber composite material through the synergistic effect of the raw materials.

Description

Technical Field

[0001] The present application relates to the technical field of PBT fibers, and in particular to a high-strength PBT fiber material and a preparation method thereof. Background Art

[0002] PBT, also known as polybutylene terephthalate, is a polyester made by the condensation of terephthalic acid and 1,4-butanediol. It is an important thermoplastic polyester. Due to its good mechanical properties, thermal stability and chemical resistance, it is widely used in automobiles, mechanical equipment, precision instrument parts, electronic appliances, textiles and other fields.

[0003] PBT meltblown non-woven fabric is a non-woven fabric material made from PBT fiber through processes such as hot pressing. Its preparation process is simple, no additional chemicals need to be added, and it is highly efficient and economical.

[0004] PBT is a semi-crystalline polymer, but its molecular chain is composed of alternating terephthalic acid units and butanediol units, forming a linear or slightly branched polymer chain, which results in high stiffness and low thermal enthalpy of PBT fibers. Existing melt-blown equipment makes it difficult to draw it, and the material has disadvantages such as large fiber diameter and material pore size, decreased breaking strength, and poor toughness, which limits its wider application prospects. Therefore, the preparation of a high-strength PBT fiber material is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In order to improve the strength of PBT fiber materials, the present application provides a high-strength PBT fiber material and a preparation method thereof.

[0006] In the first aspect, the present application provides a high-strength PBT fiber material, which adopts the following technical solution:

[0007] A high-strength PBT fiber material comprises the following raw materials in parts by weight: 60-75 parts of PBT resin, 10-20 parts of plasticizer, 2-5 parts of compatibilizer, 1-3 parts of antioxidant, and 10-15 parts of toughening agent.

[0008] The preparation method is as follows: PBT resin is uniformly mixed with a plasticizer, a compatibilizer, an antioxidant and a toughening agent, then melted at high temperature, extruded and granulated after cooling, and the mixed raw materials are melted, spun and wound to obtain a PBT fiber composite material.

[0009] By adopting the above technical solution, the high-strength PBT fiber material of the present application can improve the tensile strength and elastic recovery rate of the PBT fiber composite material through the synergistic effect between the raw materials. The tensile strength is 1.53-1.60MPa, and the elastic recovery rate is higher than 50%.

[0010] PBT resin is the main component, plasticizer can improve the rigidity of PBT, enhance the flexibility and processing performance of PBT, compatibilizer can improve the compatibility of raw materials with PBT resin, antioxidant can improve the oxidation resistance of PBT resin, toughening agent can improve the tensile strength and elastic recovery rate of PBT fiber material.

[0011] Preferably, the plasticizer is one or more of polyethylene glycol and epoxy plasticizer; the compatibilizer is one or more of maleic anhydride and polyvinyl alcohol-etherifying agent; the antioxidant is one or more of hindered phenol antioxidant, polyphenylphenol antioxidant and nitrosoamine antioxidant; the toughening agent is one or more of butene-styrene thermoplastic elastomer and polystyrene-polybutadiene-polystyrene triblock copolymer.

[0012] By adopting the above technical solution, the types of plasticizers, compatibilizers, antioxidants and toughening agents are limited, so that each raw material can play a better role and improve the tensile strength and elastic recovery rate of the PBT fiber composite material.

[0013] In a second aspect, the present application provides a method for preparing a high-strength PBT fiber material, using the following technical solution:

[0014] A method for preparing a high-strength PBT fiber material comprises the following steps:

[0015] The PBT resin is uniformly mixed with a plasticizer, a compatibilizer, an antioxidant, and a toughening agent, and then melted at a high temperature, extruded and granulated after cooling. The mixed raw materials are then melted, spun, and wound to obtain a PBT fiber composite material. DETAILED DESCRIPTION

[0016] The present application is further described in detail below in conjunction with the specific contents.

[0017] raw material

[0018] All raw materials in this application can be obtained from commercial sources.

[0019] The plasticizer is polyethylene glycol with a molecular weight of 1000; the compatibilizer is maleic anhydride; the antioxidant is hindered phenol antioxidant 1010; and the toughening agent is butene-styrene thermoplastic elastomer.

[0020] Example

[0021] Example 1

[0022] A high-strength PBT fiber material, the raw material ratio of which is shown in Table 1.

[0023] A method for preparing a high-strength PBT fiber material comprises the following steps:

[0024] The PBT resin is uniformly mixed with a plasticizer, a compatibilizer, an antioxidant, and a toughening agent, and then melted at a high temperature, extruded and granulated after cooling. The mixed raw materials are then melted, spun, and wound to obtain a PBT fiber composite material.

[0025] Embodiment 2-5

[0026] A high-strength PBT fiber material, which is different from Example 1 in that the raw material ratio of the PBT fiber material is different, and the raw material ratio is shown in Table 1.

[0027] Table 1 Raw materials of PBT fiber materials in different embodiments raw material Example 1 Example 2 Example 3 Example 4 Example 5 PBT resin 60 60 60 70 75 Plasticizers 10 12 15 15 20 Compatibilizer 2 2 2 3 5 Antioxidants 1 1 1 2 3 Toughening agent 10 10 10 12 15

[0028] Comparative Example

[0029] Comparative Example 1

[0030] A high-strength PBT fiber material, which is different from Example 1 in that no plasticizer is added to the raw material of the PBT fiber material.

[0031] Comparative Example 2

[0032] A high-strength PBT fiber material, which is different from Example 1 in that no toughening agent is added to the raw materials of the PBT fiber material.

[0033] Comparative Example 3

[0034] A high-strength PBT fiber material, which is different from Example 1 in that no compatibilizer is added to the raw materials of the PBT fiber material.

[0035] Performance testing

[0036] The following performance tests were performed on the PBT fiber materials in Examples 1-5 and Comparative Examples 1-3:

[0037] Tensile strength: The tensile strength of PBT fiber material was measured in accordance with GB / T1040.1-2018 “Determination of tensile properties of plastics Part 1: General principles”. The test results are shown in Table 2.

[0038] Elastic recovery rate: The elastic recovery rate of PBT fiber material was measured in accordance with GB / T24218.102-2022 “Test methods for textile nonwovens Part 102: Determination of tensile elasticity”. The test results are shown in Table 2.

[0039] Table 2 Test results project Tensile strength (MPa) Elastic recovery rate (longitudinal Elastic recovery rate (lateral Example 1 1.53 50 50 Example 2 1.54 52 51 Example 3 1.55 53 52 Example 4 1.58 56 55 Example 5 1.60 58 56 Comparative Example 1 1.45 42 41 Comparative Example 2 1.27 43 42 Comparative Example 3 1.50 48 45

[0040] It can be seen from Table 2 that the PBT fiber material of the present application improves the tensile strength and elastic recovery rate of the PBT fiber composite material through the interaction between the raw materials, wherein the tensile strength is 1.53-1.60 MPa, and the elastic recovery rate is higher than 50%.

[0041] Combining Example 1 and Comparative Example 1, it can be seen that the tensile strength in Example 1 is 1.53 MPa, the longitudinal elastic recovery rate is 50%, and the transverse elastic recovery rate is 50%, which is better than Comparative Example 1, indicating that the plasticizer can effectively reduce the rigidity of the PBT fiber material and improve its flexibility and elongation.

[0042] Combining Example 1 and Comparative Example 2, it can be seen that the tensile strength in Example 1 is 1.53 MPa, the longitudinal elastic recovery rate is 50%, and the transverse elastic recovery rate is 50%, which is better than Comparative Example 2, indicating that after the toughening agent is added, the PBT fiber material is changed from a brittle material to a tough material due to the introduction of flexible chains.

[0043] Combining Example 1 and Comparative Example 3, it can be seen that the tensile strength in Example 1 is 1.53 MPa, the longitudinal elastic recovery rate is 50%, and the transverse elastic recovery rate is 50%, which is better than Comparative Example 3, indicating that after the compatibilizer is added, the raw materials can interact better, so that the tensile strength and elastic recovery performance of the PBT fiber material are improved.

[0044] The above-mentioned specific implementation examples are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-strength PBT fiber composite material, characterized in that: A high-strength PBT fiber composite material, characterized in that it comprises the following raw materials in parts by weight: 60-75 parts of PBT resin, 10-20 parts of plasticizer, 2-5 parts of compatibilizer, 1-3 parts of antioxidant, and 10-15 parts of toughening agent.

2. A high-strength PBT fiber composite material according to claim 1, characterized in that: The plasticizer is one or more of polyethylene glycol and epoxy plasticizer; the compatibilizer is one or more of maleic anhydride and polyvinyl alcohol-etherifying agent; the antioxidant is one or more of hindered phenol antioxidant, polyphenyl phenol antioxidant and nitrosoamine antioxidant; the toughening agent is one or more of butene-styrene thermoplastic elastomer and polystyrene-polybutadiene-polystyrene triblock copolymer.

3. A method for preparing a high-strength PBT fiber composite material according to any one of claims 1 and 2, characterized in that: The method comprises the following steps: uniformly mixing PBT resin with plasticizer, compatibilizer, antioxidant and toughening agent, melting at high temperature, extruding and granulating after cooling, and then melting, spinning and winding the mixed raw materials to obtain PBT fiber composite material.