Production method of high-strength composite structure anti-cutting yarn

Abstract

The invention provides a production method of high-strength composite structure anti-cutting yarn, and belongs to the technical field of yarn. According to the technical scheme, modified aramid fiber filaments serve as core yarn, core-spun spinning is conducted on the modified aramid fiber filaments and high-strength polyethylene fibers, the aramid fiber filaments are impregnated and modified through a mixed oiling agent firstly and then dried and wound twice to obtain finished products, the mixed oiling agent contains epoxy resin, phenolic resin, fatty alcohol-polyoxyethylene ether and other components, and the modified aramid fiber filaments and the high-strength polyethylene fibers are mixed to form the finished products. The strength and toughness of the fiber can be obviously improved; the polyethylene fiber takes linear polyethylene powder as a raw material, firstly, the linear polyethylene powder is mixed with paraffin hydrocarbon to form suspension liquid, primary gel silk is obtained after spinning and cooling, and then the high-strength polyethylene fiber is obtained after extraction, drying and stretching. On the basis of the technical scheme, the nylon fiber serves as sheath yarn, secondary core-spun spinning is executed, the resin material of the nylon fiber takes binary acid and diamine as polymeric monomers, the excellent mechanical performance is achieved, and the anti-cutting performance of the yarn can be remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of yarn, in particular to a production method of high-strength composite structure cut-resistant yarn. BACKGROUND

[0002] Cut-resistant yarn is a kind of high-strength fiber made of specific materials and treated specially, which has good cut-resistant performance and wear resistance, and is widely used in protective gloves, arm guards, shoes, shirts and other protective products. The materials used for cut-resistant yarn mainly include three types: metal fiber, high polymer material and glass fiber. Among them, metal fiber is the best material for cut-resistant performance, but it is not suitable for direct contact with the skin due to its poor comfort. High polymer material has good softness and air permeability, and is suitable for making safety protective gloves and the like. Glass fiber can achieve high cut-resistant performance and comfort at the same time, but it has certain safety hazards.

[0003] In the prior art, high polymer material is still the most widely used. Currently, the fiber materials commonly used for cut-resistant yarn mainly include aramid fiber, polyethylene fiber and nylon fiber, and the manufacturing process generally includes spinning, drawing and weaving steps. Aramid fiber is a high-strength and high-modulus synthetic fiber, which has good cut-resistant performance, wear resistance and high-temperature resistance, and is mainly used for manufacturing cut-resistant gloves and cut-resistant shirts and other protective products; polyethylene fiber has strong wear resistance, cut resistance and toughness, but its cut-resistant performance is slightly inferior to that of aramid fiber. Therefore, it is often used to manufacture light-weight cut-resistant protective products, such as shoe covers, knee pads, etc.; nylon fiber is a good comprehensive synthetic fiber, which has strong cut resistance, wear resistance and relatively good ultraviolet resistance. It is mainly used for manufacturing cut-resistant gloves, arm guards, cut-resistant coats and other protective products. In the prior art, the mechanical properties of conventional cut-resistant yarn still need to be improved. In this case, how to improve the cut-resistant performance through the improvement of the material itself and the manufacturing process has been a technical problem to be solved in the field. SUMMARY

[0004] The technical problem to be solved by the present application is how to improve the cut-resistant performance without significantly affecting the lightness and comfort of the fabric.

[0005] To achieve the above technical purpose, the present application adopts the following technical scheme: A production method of high-strength composite structure cut-resistant yarn, comprising: 1) The aramid fiber is pretreated by immersing it in a mixed oil for 2-3 hours; the pretreated aramid fiber is dried, and the dried aramid fiber is wound to obtain the first fiber material; the mixed oil contains the following components: epoxy resin 2.0-18.0 wt%, phenolic resin 2.0-10.0 wt%, fatty alcohol polyoxyethylene ether 2.0-12.0 wt%, phosphate ester 2.0-15.0 wt%, glyceryl oleate 5.0-20.0 wt%, and the balance is distilled water; 2) Linear polyethylene powder is placed in a paraffinic solvent, and the resulting homogeneous suspension is heated to dissolve. The dissolved solution is degassed at high temperature and then extruded from a spinneret and cooled to form nascent gel fibers. The nascent gel fibers are then placed in a vacuum environment at a temperature of 40℃~120℃ for 3~24h. The placed gel fibers are then immersed in an extractant to extract them. The extracted fibers are then dried. The dried fibers are then stretched to obtain the second fiber material. 3) Nylon resin is melted by a twin-screw extruder and spun from a spinneret. After stretching and cooling, a third fiber material is obtained. The monomers of this nylon resin include a diacid and a diamine. The molar proportion of aromatic diacid in the diacid is not less than 98%. The diamine includes at least two types of diamines with 2 to 6 carbon atoms, and the molar proportion of any one type of diamine in the total diamine does not exceed 80%. 4) Using the first fiber material obtained in step 1) as the core yarn and the second fiber material obtained in step 2) as the sheath yarn, perform the first core-spun yarn to obtain a semi-finished yarn; 5) Using the semi-finished yarn obtained in step 4) as the core yarn and the third fiber material obtained in step 3) as the sheath yarn, perform a second core-spun yarn to obtain the high-strength composite structure anti-cut yarn.

[0006] Preferably, the phosphate ester in step 1) is one of fatty alcohol polyether phosphate ester, alkylphenol polyether phosphate ester, and arylphenol polyether phosphate ester; the phenolic resin is prepared by polycondensation reaction of resorcinol and formaldehyde.

[0007] Preferably, the mixed oil agent in step 1) is prepared by the following method: epoxy resin, phenolic resin, fatty alcohol polyoxyethylene ether, phosphate ester, glyceryl oleate and distilled water are mixed and stirred at a stirring temperature of 40℃~60℃ for 1.5h~4h.

[0008] Preferably, the aramid fibers pretreated in step 1) are dried twice. The first drying temperature is 150~180℃ and the time is 30~40min, and the second drying temperature is 200~230℃ and the time is 10~20min.

[0009] Preferably, the linear polyethylene in step 2) has a relative molecular mass of 1 million to 8 million; and the polyethylene in the suspension has a weight content of 2% to 20%.

[0010] Preferably, the paraffin hydrocarbon solvent in step 2) is a straight-chain alkane, branched alkane, cycloalkane or derivative thereof having 18 to 30 carbon atoms; and the polyethylene in the primary gel filament has a weight content of 1.5% to 18%.

[0011] Preferably, the vacuum environment in step 2) has a pressure of 0 to 9000 Pa; and the temperature of the vacuum environment is 60°C to 80°C; and the extractant is selected from one or several of benzene, toluene, xylene, gasoline, halogenated alkane, straight-chain alkane, branched alkane, cycloalkane having 4 to 8 carbon atoms.

[0012] Preferably, the nylon fiber in step 3) has a filament diameter of less than 200 μm; and the total molar proportion of the diamine having 2 to 6 carbon atoms in the diamine is not less than 95%.

[0013] Preferably, the aromatic diacid in step 3) is terephthalic acid; and the diamine contains hexamethylenediamine and pentanediamine, and the molar ratio of the two amines in all diamines is not less than 95%, and the molar ratio of the pentanediamine and hexamethylenediamine is 1:1.5 to 1.5:1.

[0014] Preferably, the nylon resin in step 3) has a glass transition temperature of not less than 120°C and a melting point of 290 to 320°C; and the relative viscosity of the nylon resin is 2.0 to 4.0.

[0015] The present application provides a production method of high-strength composite structure anti-cutting yarn. In the technical solution, modified aramid fiber filament is used as core yarn, and high-strength polyethylene fiber is used for core-spun yarn, wherein the aramid fiber filament is first modified by using mixed oil agent, and then dried twice and wound to obtain finished product, the mixed oil agent contains epoxy resin, phenolic resin, fatty alcohol polyoxyethylene ether, phosphate and other components, which can significantly improve the strength and toughness of the fiber; the polyethylene fiber uses linear polyethylene powder as raw material, first mixes with paraffin hydrocarbon to form a suspension, and then sprays, cools to obtain primary gel filament, and then extracts, dries and stretches to obtain high-strength polyethylene fiber. On the basis of the above technical solution, nylon fiber is used as sheath yarn, and second core-spun yarn is performed, the resin material of the nylon fiber uses diacid and diamine as polymerization monomer, has excellent mechanical properties, and can significantly improve the anti-cutting performance of the yarn. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an electron microscope image of the high-strength composite structure anti-cutting yarn of the present application. DETAILED DESCRIPTION

[0017] The specific embodiments of the present application will be described in detail below. In order to avoid excessive unnecessary details, the well-known structures or functions will not be described in detail in the following examples. The approximate language used in the following examples can be used for quantitative expression, indicating that the amount can be allowed to have certain variation without changing the basic function. Unless defined, the technical and scientific terms used in the following examples have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0018] Example 1 A production method of high-strength composite structure anti-cutting yarn, comprising the following steps: 1) The aramid fiber is immersed in a mixed oil agent for 2.5h for pretreatment; the pretreated aramid fiber is dried, and the dried aramid fiber is wound to obtain a first fiber material; the mixed oil agent contains the following components: epoxy resin 8.5wt%, phenolic resin 7.7wt%, fatty alcohol polyoxyethylene ether 10wt%, phosphate ester 13.2wt%, glyceryl oleate 15.4wt%, and the balance is distilled water; 2) Put the linear polyethylene powder into paraffin hydrocarbon solvent, heat and dissolve the mixed uniform suspension, and then extrude the dissolved solution from the spinneret after high-temperature degassing, and cool to form the primary gel yarn; the primary gel yarn is placed in a vacuum environment at a temperature of 70℃ for 12h; the gel yarn after standing is immersed in an extractant, and the gel yarn is extracted; the extracted fiber is dried; and the dried fiber is stretched to obtain a second fiber material; 3) The nylon resin is melted by a double-screw extruder and spun from a spinneret, stretched, and cooled to obtain a third fiber material; the polymerization monomers of the nylon resin include diacid and diamine, the molar proportion of aromatic diacid in the diacid is 98.5%, and the diamin in the diamine includes at least two kinds of diamin with 2-6 carbon atoms, and any one diamin accounts for no more than 80% of the total molar proportion of diamine; 4) The first fiber material obtained in step 1) is used as the core yarn, and the second fiber material obtained in step 2) is used as the sheath yarn, and the first core-spun yarn is executed to obtain a semi-finished yarn; 5) The semi-finished yarn obtained in step 4) is used as the core yarn, and the third fiber material obtained in step 3) is used as the sheath yarn, and the second core-spun yarn is executed to obtain the high-strength composite structure anti-cutting yarn.

[0019] The phosphate ester in step 1) is a fatty alcohol polyether phosphate ester; the phenolic resin is prepared by condensation polymerization of resorcinol and formaldehyde. The mixed oil agent in step 1) is prepared by mixing and stirring epoxy resin, phenolic resin, fatty alcohol polyoxyethylene ether, phosphate ester, glyceryl oleate and distilled water, the stirring temperature is 55℃, and the stirring time is 3h. The pretreated aramid fiber in step 1) is dried twice, the first drying temperature is 160℃, and the first drying time is 35min, the second drying temperature is 220℃, and the second drying time is 15min.

[0020] The relative molecular mass of the linear polyethylene in step 2) is 4-6 million; the weight content of polyethylene in the suspension is 10%. The paraffin hydrocarbon solvent in step 2) is a mixture of straight-chain alkanes, branched alkanes and cycloalkanes with carbon atom number of 18-30; the weight content of polyethylene in the primary gel fiber is 10%. The pressure of the vacuum environment in step 2) is 5000Pa; the temperature of the vacuum environment is 70℃; and the extractant is toluene.

[0021] The monofilament diameter of the nylon fiber in step 3) is 100-150μm; the total mole proportion of the diamine with 2-6 carbon atoms in the diamine is 96.3%. The aromatic diacid in step 3) is terephthalic acid; the diamine contains hexamethylenediamine and pentanediamine, and the mole ratio of the two amines in all diamines is 97%, and the mole ratio of pentanediamine and hexamethylenediamine is 1:1. The glass transition temperature of the nylon resin in step 3) is 140℃, and the melting point is 305℃; the relative viscosity of the nylon resin is 2.8.

[0022] Comparative Example 1 Aramid 1414 cut-resistant yarn product produced by Zhejiang Xuantai New Material Co., Ltd.

[0023] Comparative Example 2 HPPE short fiber core-spun cut-resistant yarn product produced by Shantou Mingda Textile Co., Ltd.

[0024] The cut-resistant performance, hand feeling and breakage degree of Example 1, Comparative Example 1 and Comparative Example 2 are investigated by experimental methods as follows.

[0025] Cut resistance: The cut resistance of the fabric is measured according to ASTM F2992 / F2992M-15 test method using a TDM-100 cut resistance tester. The specific method is as follows: the fabric woven by the cut-resistant yarn is used as the sample, the sample size is 100 mm long x 50 mm wide, the horizontal sliding speed of the load blade is set to 2.5 mm / s, different levels of load are applied to the sample for cutting, and the corresponding cutting distance is ensured to be in the range of 5-20 mm, 20-33 mm, and 33-51 mm, with at least 5 valid values in each range, to obtain the cutting force-cutting distance relationship, fit the cutting force-cutting distance relationship curve, and take the load corresponding to the cutting distance of 20 mm as the characteristic cutting force of the sample. The fitting formula of the cutting force-cutting distance relationship curve is: y = 10 (ax+b) In the formula: x is the cutting load, and y is the cutting distance. The cutting load is 1500 / gf, reaching the A4 level of ANSI / ISEA 105-2016 standard, the cutting load is 3000 / gf, reaching the A6 level of ANSI / ISEA 105-2016 standard, and the higher the cutting load value, the better the surface cut resistance.

[0026] Hand feeling: The test is carried out in a constant temperature and humidity laboratory [temperature (20±2) °C, relative humidity (65±4)%], and two square samples with a side length of 20 cm are cut from the surface of the fabric woven by the cut-resistant yarn at a flat and smooth part without any obvious defects and wrinkles. Ten test personnel are selected, each independently conducts evaluation, touches the front and back of the sample with hands, and scores the softness of the sample according to the feeling after touching according to 1-10 points, and the softness is obtained by dividing the score by 10.

[0027] Breakage degree: The cut-resistant yarn is woven into gloves, five samples are prepared for each example, and the 4N program in GB / T 8629-2017 "Textiles - Domestic washing and drying procedures for test specimens" is used for washing 15 times, the program F is used for flip drying, the drying temperature is 60°C, and the drying time is 80 min. The number of broken ends of the five samples is counted under a microscope, the minimum and maximum values of the number of broken ends of the five samples are taken as the two end points of the interval, and the interval of the number of broken ends of each example is obtained.

[0028] The experimental results show that the cutting load of the anti-cutting yarn of Example 1 reaches 4832 / gf, the cutting loads of Comparative Example 1 and Comparative Example 2 are 1321 / gf and 1109 / gf respectively. The hand softness score of Example 1 is 8.8, the scores of Comparative Example 1 and Comparative Example 2 are 5.5 and 6.2 respectively. The broken end number interval of Example 1 is 1-3, the broken end number interval of Comparative Example 1 is 15-23, and the broken end number interval of Comparative Example 2 is 20-30. The above experimental results show that the anti-cutting performance of the anti-cutting yarn of the present application is significantly better than that of Comparative Example 1 and Comparative Example 2, and the hand softness is better, the broken end number is extremely small, and the quality is higher.

[0029] The above detailed description of the embodiments of the present application is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the scope of the present application should be included in the protection scope of the present application.

Claims

1. A method of producing a high strength composite structure cut-resistant yarn, characterized by, The application relates to a high-strength composite structure anti-cutting yarn. 1) pretreating aramid fibers by immersing the aramid fibers in mixed oil for 2-3 hours; drying the pretreated aramid fibers, winding the dried aramid fibers, and obtaining a first fiber material; the mixed oil contains the following components: 2.0-18.0 wt% of epoxy resin, 2.0-10.0 wt% of phenolic resin, 2.0-12.0 wt% of fatty alcohol polyoxyethylene ether, 2.0-15.0 wt% of phosphate ester, 5.0-20.0 wt% of glyceryl oleate, and the balance of distilled water; 2) putting linear polyethylene powder into a paraffin hydrocarbon solvent, heating and dissolving the mixed uniform suspension, high-temperature defoaming the dissolved solution, extruding the solution from a spinneret, and cooling to form nascent gel filaments; the nascent gel filaments are placed in a vacuum environment with a temperature of 40-120 DEG C for 3-24 hours; the gel filaments are immersed in an extracting agent for extraction; the extracted fibers are dried; and the dried fibers are stretched to obtain a second fiber material; 3) melting nylon resin through a double-screw extruder, spinning the resin from a spinneret, stretching, and cooling to obtain a third fiber material; the polymerization monomers of the nylon resin include binary acids and binary amines, the molar proportion of aromatic binary acids in the binary acids is not less than 98%, and the binary amines include at least two kinds of binary amines with 2-6 carbon atoms, and the molar proportion of any one kind of binary amine in the total binary amines is not more than 80%; 4) performing first core-spun spinning by taking the first fiber material obtained in step 1) as core yarn and the second fiber material obtained in step 2) as sheath yarn, and obtaining semi-finished yarn; 5) performing second core-spun spinning by taking the semi-finished yarn obtained in step 4) as core yarn and the third fiber material obtained in step 3) as sheath yarn, and obtaining the high-strength composite structure anti-cutting yarn.

2. A method of producing a high strength composite structure cut-resistant yarn according to claim 1, characterized in that, The phosphate ester in step 1) is one of fatty alcohol polyether phosphate ester, alkyl phenol polyether phosphate ester and aryl phenol polyether phosphate ester; and the phenolic resin is prepared by condensation polymerization reaction of resorcinol and formaldehyde.

3. The method of claim 1, wherein the high strength composite structure anti- cut yarn is produced by the steps of: The mixed oil in step 1) is prepared by the following method: mixing and stirring epoxy resin, phenolic resin, fatty alcohol polyoxyethylene ether, phosphate ester, glyceryl oleate and distilled water, and the stirring temperature is 40-60 DEG C and the stirring time is 1.5-4 hours.

4. The method of claim 1, wherein the high strength composite structure anti- cut yarn is produced by the steps of: The pretreated aramid fibers in step 1) are dried twice, the first time with a temperature of 150-180 DEG C and a time length of 30-40 minutes, and the second time with a temperature of 200-230 DEG C and a time length of 10-20 minutes.

5. The method of claim 1, wherein the high strength composite structure anti- cut yarn is produced by the steps of: The relative molecular mass of the linear polyethylene in step 2) is 1-8 million; and the weight content of polyethylene in the suspension is 2-20%.

6. The method of claim 1, wherein the high strength composite structure anti- cut yarn is produced by the steps of: The paraffin hydrocarbon solvent in step 2) is a straight-chain alkane, branched-chain alkane, naphthenic hydrocarbon or derivative thereof with 18-30 carbon atoms; and the weight content of polyethylene in the nascent gel filaments is 1.5-18%.

7. The method for producing a high-strength composite structure anti-cut yarn according to claim 1, characterized in that, The pressure of the vacuum environment in step 2) is 0-9000 Pa; the temperature of the vacuum environment is 60-80 ℃; and the extractant is selected from one or several of the following components: benzene, toluene, xylene, gasoline, halogenated alkane, C4-C8 straight-chain alkane, branched alkane, and naphthene.

8. The method of claim 1, wherein the high strength composite structure anti- cut yarn is produced by the steps of: The monofilament diameter of the nylon fiber in step 3) is less than 200 μm; and the total molar proportion of the diamine with 2-6 carbon atoms in the diamine is not less than 95%.

9. The method of claim 1, wherein the high strength composite structure anti- cut yarn is produced by the steps of: The aromatic diacid in step 3) is terephthalic acid; the diamine contains hexamethylenediamine and pentanediamine, and the molar ratio of the two amines in all diamines is not less than 95%; and the molar ratio of the pentanediamine and hexamethylenediamine is 1:1.5-1.5:

1.

10. The method of claim 1, wherein the high strength composite structure anti- cut yarn is produced by the steps of: The glass transition temperature of the nylon resin in step 3) is not less than 120 ℃, and the melting point is 290-320 ℃; and the relative viscosity of the nylon resin is 2.0-4.0.

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