A preparation method of porous polyethylene fiber and its product

Abstract

The present invention discloses a method for preparing a porous polyethylene fiber and its product, which relates to the field of textile technology. The specific steps of the preparation method are as follows: S1, after uniformly mixing ultra-high molecular weight polyethylene powder, a solvent and an antioxidant, heating to obtain a mixed solution A; S2, after uniformly mixing ultra-high molecular weight polyvinyl acetate powder and dimethyl sulfoxide, heating to obtain a mixed solution B; S3, slowly adding the mixed solution A and the mixed solution B to an amphoteric surfactant, and uniformly mixing to obtain a mixed solution C; S4, after preparing the mixed solution C into a gel precursor, sequentially performing alcoholysis, extraction, hydrolysis, drying and heat drawing to obtain a porous polyethylene fiber. The present invention uses solid-phase porogenic technology and a heterogeneous component spinning process to achieve rapid preparation of porous polyethylene fibers, and can effectively control and adjust the porosity of the porous polyethylene fibers, so that they have good market prospects when used in the field of clothing.

Description

Technical Field

[0001] The present invention relates to the field of textile technology, in particular to a preparation method of porous polyethylene fiber and a product thereof. Background Art

[0002] Ultra-high molecular weight polyethylene fiber, also known as UHMWPE fiber, boasts excellent properties such as high specific strength, high specific stiffness, corrosion resistance, and low-temperature resistance. It is a commonly used material in military and police equipment, civilian protection, emergency response, marine engineering, and other fields. However, due to the smooth surface and low interfacial adhesion with other materials, traditional UHMWPE fiber is difficult to dye. This difficulty and high cost limit its application in clothing and hinder its practicality.

[0003] The prior art has studied the preparation of ultra-high molecular weight polyethylene fibers with easy-to-dye properties, such as patent application CN104746165A, which discloses an ultra-high molecular weight polyethylene porous fiber and a preparation method thereof. The polyethylene fibers prepared thereby all have a porous structure on their surfaces, and the dye solution can adhere to the fiber surface through the micropores, thereby achieving the purpose of fiber dyeing and reducing the difficulty and cost of dyeing to a certain extent. However, the porous structures formed in the prior art are mostly limited in adjustability, resulting in the ultimately prepared ultra-high molecular weight polyethylene fibers having mediocre dyeing properties, which limits their further development in the clothing field and their overall practicality.

[0004] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the Invention

[0005] The object of the present invention is to provide a method for preparing porous polyethylene fibers and products thereof, so as to solve the technical problem that the porous structures formed in the prior art proposed in the above-mentioned background technology are mostly limited in adjustability, resulting in that the dyeing performance of the ultra-high molecular weight polyethylene fibers finally prepared is still mediocre, so that further development in the field of clothing is limited and the overall practicality is still mediocre.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for preparing porous polyethylene fiber, the specific steps are as follows:

[0008] S1. After uniformly mixing ultra-high molecular weight polyethylene powder, solvent and antioxidant, heating to 100-120° C. to obtain a mixed solution A, wherein the mass ratio of ultra-high molecular weight polyethylene powder to solvent is 10-20:100, and the ultra-high molecular weight polyethylene powder has a molecular weight of 300,000-500,000 polyethylene powder, ensuring that the ultra-high molecular weight polyethylene can be smoothly spun at a screw heating temperature of 220-250° C., because polyvinyl acetate powder will decompose at a temperature exceeding 250° C.;

[0009] S2. After uniformly mixing ultra-high molecular weight polyvinyl acetate powder and dimethyl sulfoxide, heating at 60-80° C. to obtain a mixed solution B, wherein the mass ratio of ultra-high molecular weight polyvinyl acetate powder to dimethyl sulfoxide is 8-15:100, and the ultra-high molecular weight polyvinyl acetate powder has a molecular weight of 300,000 to 500,000 and has better thermal stability than low molecular weight polyvinyl acetate;

[0010] S3. Slowly adding the mixed solution A and the mixed solution B to the amphoteric surfactant and mixing them uniformly to obtain a mixed solution C, wherein the mass ratio of the ultra-high molecular weight polyvinyl acetate powder to the ultra-high molecular weight polyethylene powder is 15-40:100, and the mass ratio of the mixed solution B to the amphoteric surfactant is 1-2:2;

[0011] S4. After preparing the mixed solution C into gel precursor, the mixed solution C is sequentially subjected to alcoholysis, extraction, hydrolysis, drying and hot stretching to prepare porous polyethylene fibers, wherein the alcoholysis adopts a dry alcoholysis method, the extraction is carried out in n-hexane, the hydrolysis is treated in water at 80-90°C for 15-20 minutes, and the hot stretching can be selected from primary stretching, secondary stretching and tertiary stretching at a temperature of 100-110°C. At a higher temperature, the polyethylene will melt and reduce the porosity of the fiber. The stretching ratio is 1.5-4.5 times, which can be adjusted according to the breaking strength and porosity. The preparation method of the gel precursor is as follows: after the mixed solution C enters the feeding kettle through a delivery pump, it passes through a filter, a metering pump, a spinneret and a coagulation bath in sequence to prepare the gel precursor.

[0012] Furthermore, the solvent is one or a combination of white oil and decalin, the antioxidant is one or a combination of antioxidant 1010 and antioxidant Irgafos-168, and the amphoteric surfactant is an amine oxide type amphoteric surfactant, which can be octadecyl dihydroxyethyl amine oxide, octadecyl amide propyl amine oxide, cocoamidopropyl amine oxide, etc.

[0013] The present invention also provides a porous polyethylene fiber, which is prepared by the above preparation method.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. In the present invention, ultrahigh molecular weight polyvinyl acetate powder is first mixed with ultrahigh molecular weight polyethylene powder, and then the ultrahigh molecular weight polyvinyl acetate is removed by alcoholysis, so that the volume originally occupied by the ultrahigh molecular weight polyvinyl acetate is formed into pores. The solid-phase pore-forming technology is successfully used in conjunction with a heterogeneous component spinning process to achieve rapid preparation of polyethylene fibers with a rich pore structure. In addition, the porosity of the prepared porous polyethylene fibers can be effectively controlled and adjusted by changing the proportion of the ultrahigh molecular weight polyvinyl acetate powder throughout the process, thereby significantly improving the designability of the polyethylene fibers during dyeing and the dyeing performance of the polyethylene fibers, thereby providing them with good market prospects for application in the clothing field and further enhancing their overall practicality.

[0016] 2. The polyethylene in the present invention is a non-polar macromolecule and can only be dissolved in non-polar solvents. The polyvinyl acetate in the present invention is a polar macromolecule and can only be dissolved in polar solvents. The introduction of the amphoteric surfactant in the present invention achieves uniform emulsification and mutual dissolution of polar solvents and non-polar solvents. The synergistic effect of polyethylene and polyvinyl acetate with the amphoteric surfactant further ensures the rapid preparation of polyethylene fibers with rich pore structures and the dyeing properties of the polyethylene fibers.

[0017] 3. The porous polyethylene fiber prepared by the present invention is easy to dye and has excellent dyeing performance. At the same time, it has the advantages of light weight, easy dyeing, warmth retention, low cost, etc., and is very suitable for development in the clothing field. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the working principle of the present invention;

[0019] In the figure: 1. porous polyethylene fiber, 2. pores. DETAILED DESCRIPTION

[0020] The following examples are used to further illustrate the present invention but are not intended to limit its application.

[0021] The raw materials of the present invention are all commercially available products. Example 1

[0022] Preparation of porous polyethylene fibers:

[0023] S1. Dissolve polyethylene powder with a molecular weight of 300,000 and antioxidant 1010 in white oil, with the mass fraction of polyethylene powder being 20%. Stir well and heat to 100°C to obtain a mixed solution A.

[0024] S2. Dissolve polyvinyl acetate powder with a molecular weight of 400,000 in dimethyl sulfoxide (DMSO) at a mass fraction of 10%, stir evenly, and heat to 80° C. to obtain a mixed solution B.

[0025] S3. Slowly adding mixed solution A and mixed solution B to octadecyl dihydroxyethyl amine oxide, at this time, the mass ratio of polyvinyl acetate powder to polyethylene powder is 20:100, and the mass ratio of mixed solution B to octadecyl dihydroxyethyl amine oxide is 2:2, and stirring uniformly to obtain mixed solution C;

[0026] S4, after the mixed solution C enters the feeding kettle through the delivery pump, it passes through the filter, metering pump, spinneret and coagulation bath in sequence to prepare gel precursor (also known as ultra-high molecular weight polyethylene polyvinyl acetate gel precursor);

[0027] S5. The gel precursor is hydrolyzed in an alkaline methanol solution to hydrolyze polyvinyl acetate into polyvinyl alcohol. Dimethyl sulfoxide is extracted at the same time, and then treated in 90°C hot water for 15 minutes to complete the hydrolysis. After the hydrolysis is completed, it is dried. The dried solid silk is subjected to a primary drawing at 100°C and 3 times the stretching and a secondary drawing at 110°C and 1.5 times the stretching to obtain a porous polyethylene fiber. Example 2

[0028] Preparation of porous polyethylene fibers:

[0029] S1. Dissolve polyethylene powder with a molecular weight of 400,000, antioxidant 1010, and antioxidant Irgafos-168 in white oil, with the mass fraction of polyethylene powder being 15%. Stir well and heat to 110° C. to obtain a mixed solution A.

[0030] S2. Dissolve polyvinyl acetate powder with a molecular weight of 300,000 in dimethyl sulfoxide (DMSO) at a mass fraction of 15%, stir evenly, and heat to 70° C. to obtain a mixed solution B.

[0031] S3. Slowly add mixed solution A and mixed solution B to octadecyl amide propylamine oxide. At this time, the mass ratio of polyvinyl acetate powder to polyethylene powder is 30:100, and the mass ratio of mixed solution B to octadecyl amide propylamine oxide is 1:2. After stirring evenly, a mixed solution C is obtained.

[0032] S4, after the mixed solution C enters the feeding kettle through the delivery pump, it passes through the filter, metering pump, spinneret and coagulation bath in sequence to prepare gel precursor (also known as ultra-high molecular weight polyethylene polyvinyl acetate gel precursor);

[0033] S5. The gel precursor is hydrolyzed in an alkaline methanol solution to hydrolyze polyvinyl acetate into polyvinyl alcohol. Dimethyl sulfoxide is extracted at the same time, and then treated in 85°C hot water for 20 minutes to complete the hydrolysis. After the hydrolysis is completed, it is dried. The dried solid silk is subjected to a primary drawing at 100°C and 4 times the stretching and a secondary drawing at 110°C and 1.5 times the stretching to obtain a porous polyethylene fiber. Example 3

[0034] Preparation of porous polyethylene fibers:

[0035] S1. Dissolve polyethylene powder with a molecular weight of 500,000 and antioxidant Irgafos-168 in decalin, with the mass fraction of polyethylene powder being 10%. Stir well and heat to 120° C. to obtain a mixed solution A.

[0036] S2. Dissolve polyvinyl acetate powder with a molecular weight of 500,000 in dimethyl sulfoxide (DMSO) at a mass fraction of 8%, stir evenly, and heat to 60° C. to obtain a mixed solution B.

[0037] S3, mixed solution A and mixed solution B are slowly added in cocamidopropylamine oxide, now, the mass ratio of polyvinyl acetate powder and polyethylene powder is 40:100, and the mass ratio of mixed solution B and cocamidopropylamine oxide is 1.5:2, after stirring, obtain mixed solution C;

[0038] S4, after the mixed solution C enters the feeding kettle through the delivery pump, it passes through the filter, metering pump, spinneret and coagulation bath in sequence to prepare gel precursor (also known as ultra-high molecular weight polyethylene polyvinyl acetate gel precursor);

[0039] S5. The gel precursor is hydrolyzed in an alkaline methanol solution to hydrolyze polyvinyl acetate into polyvinyl alcohol. Dimethyl sulfoxide is extracted at the same time, and then treated in 80°C hot water for 17 minutes to complete the hydrolysis. After the hydrolysis is completed, it is dried. The dried solid silk is subjected to a primary drawing at 100°C and 4.5 times the stretching and a secondary drawing at 110°C and 1.5 times the stretching to obtain a porous polyethylene fiber.

[0040] like Figure 1 As shown, Examples 1-3 can all prepare porous polyethylene fibers 1 with abundant pores 2. The pores 2 are formed after the hydrolysis of polyvinyl acetate. By changing the proportion of ultra-high molecular weight polyvinyl acetate powder, the porosity of the porous polyethylene fiber 1 will also change accordingly. For example, the porosity of the porous polyethylene fiber 1 prepared in Example 1 is 18%, and the porosity of the porous polyethylene fiber 1 prepared in Example 2 is 26%.

Claims

1. A method for preparing porous polyethylene fiber, characterized in that: The specific steps are as follows: S1. After uniformly mixing ultra-high molecular weight polyethylene powder, a solvent, and an antioxidant, the mixture is heated to a certain temperature to obtain a mixed solution A, wherein the solvent is one or a combination of white oil and decalin, and the antioxidant is one or a combination of antioxidant 1010 and antioxidant Irgafos-168; S2, mixing ultra-high molecular weight polyvinyl acetate powder and dimethyl sulfoxide uniformly, and heating to a certain temperature to obtain a mixed solution B; S3, slowly adding the mixed solution A and the mixed solution B to the amphoteric surfactant, and mixing them uniformly to obtain a mixed solution C, wherein the amphoteric surfactant is an amine oxide type amphoteric surfactant; S4. After the mixed solution C is prepared into gel filaments, the porous polyethylene fibers are prepared by alcoholysis, extraction, hydrolysis, drying and heat drawing in sequence, wherein the alcoholysis adopts a dry alcoholysis method, the extraction is carried out in n-hexane, and the hydrolysis is treated in water at 80-90° C. for 15-20 minutes.

2. The method for preparing a porous polyethylene fiber according to claim 1, wherein: The ultra-high molecular weight polyethylene powder is polyethylene powder with a molecular weight of 300,000 to 500,000, and the ultra-high molecular weight polyvinyl acetate powder is polyvinyl acetate powder with a molecular weight of 300,000 to 500,000.

3. The method for preparing a porous polyethylene fiber according to claim 1, wherein: In step S1, the mass ratio of ultra-high molecular weight polyethylene powder to solvent is 10-20:100, and the heating temperature is 100-120°C.

4. The method for preparing a porous polyethylene fiber according to claim 1, wherein: In step S2, the mass ratio of ultra-high molecular weight polyvinyl acetate powder to dimethyl sulfoxide is 8-15:100, and the heating temperature is 60-80°C.

5. The method for preparing a porous polyethylene fiber according to claim 1, wherein: In step S3, the mass ratio of ultra-high molecular weight polyvinyl acetate powder to ultra-high molecular weight polyethylene powder is 15-40:100, and the mass ratio of mixed solution B to amphoteric surfactant is 1-2:

2.

6. The method for preparing porous polyethylene fiber according to claim 1, wherein: The preparation method of the gel precursor in step S4 is as follows: after the mixed solution C enters the feeding kettle through the delivery pump, it passes through the filter, the metering pump, the spinneret and the coagulation bath in sequence to prepare the gel precursor.

7. The method for preparing porous polyethylene fiber according to claim 1, characterized in that: In step S4, the hot stretching can be selected from primary stretching, secondary stretching and tertiary stretching, the temperature is 100-110° C., and the stretching ratio is 1.5-4.5 times.

8. A porous polyethylene fiber, characterized in that The porous polyethylene fiber is prepared by the preparation method of any one of claims 1 to 7.

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