Wiping cloth and preparation method thereof

Abstract

The invention belongs to the technical field of non-woven fabric processes, and particularly relates to wiping cloth and a preparation method thereof.The wiping cloth comprises a base cloth permeation layer and a base cloth wiping layer, the base cloth permeation layer is prepared by mixing and carding polypropylene filament yarn and polypropylene short fiber, and the base cloth wiping layer is a fiber membrane with a filling material dispersed in composite fiber. Wherein the base cloth wiping layer is prepared by the following steps: preparing an electret nanofiber membrane from a filling material which is an exciting charge enhancer and a composite fiber matrix polymer through an electrostatic spinning in-situ charging technology, and carrying out edge sealing to obtain the base cloth wiping layer. The preparation method comprises the following steps: spraying a pressure-sensitive adhesive on the outer sides of the base cloth permeable layer and the base cloth wiping layer, correspondingly overlapping, and pressing to obtain the wiping cloth. The unique layered three-dimensional structure of the composite fiber endows the material with higher strength and toughness, and the stability of the material is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of non-woven fabric processes, and in particular relates to a wiping cloth and a preparation method thereof. Background Art

[0002] Traditional textile wipes are usually made of natural fibers such as cotton, linen, silk, or synthetic fibers. These wipes go through weaving, dyeing, and finishing during the production process. Weaving is the process of spinning fibers into yarns and then weaving them into cloth; dyeing is the process of immersing the cloth in dyes so that the dyes penetrate into the fibers of the cloth; and finishing is to improve the water absorption, softness, wrinkle resistance, and other properties of the cloth. However, traditional wipes also have some problems during use, such as easy shedding and leaving fiber scraps. In addition, some traditional textile wipes may use water solvents containing harmful chemicals for dyeing and finishing during the production process, which will not only pollute the environment, but may also cause potential harm to human health. Non-woven fabrics are non-woven fabrics made of polymer chips, short fibers or filaments through airflow or mechanical webs, reinforced by hot rolling, and finally finished to form non-woven fabrics. Compared with traditional wiping cloths, non-woven wiping cloths not only have the characteristics of high liquid absorption rate, strong dirt absorption and good softness, but the specially finished wiping materials also have certain functions.

[0003] In the prior art, the production efficiency of traditional wiping cloths is low, the cleaning ability and dirt holding capacity are insufficient, and they are easy to leave hair and water marks after wiping. They are not resistant to chemical corrosion, high temperature and have poor mechanical properties. Summary of the invention

[0004] The purpose of the present invention is to provide a wiping cloth and a preparation method thereof, by using nano-scale polyvinylidene fluoride as an excitatory charge enhancer and a composite fiber matrix polymer, and preparing an electret nanofiber membrane through electrospinning in-situ charging technology to significantly improve the comprehensive performance of the wiping cloth.

[0005] The technical problems to be solved by the present invention are: lack of resistance to chemical corrosion and poor mechanical properties.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A wiping cloth comprises a base fabric penetration layer and a base fabric wiping layer, wherein the base fabric penetration layer is made by combing a mixture of polypropylene filaments and polypropylene staple fibers, and the base fabric wiping layer refers to a fiber membrane in which a filling material is dispersed in composite fibers.

[0008] The composite fiber refers to ethylene glycol-tetrafluoroethylene copolymer / LDH composite fiber, and the filling material refers to nano-scale polyvinylidene fluoride.

[0009] Further, the base fabric wiping layer comprises the following steps to prepare:

[0010] The filling material is an excitatory charge enhancer and a composite fiber matrix polymer. An electret nanofiber membrane is prepared by electrospinning in-situ charging technology, and a base cloth wiping layer is obtained after edge sealing.

[0011] Furthermore, the composite fiber is prepared by the following steps:

[0012] S1, dispersing zinc aluminum layered double hydroxide (ZnAl-LDH) into a toluene solution containing RAFT agent S,S'-p-(α,α'-dimethyl-α"-acetic acid) trithiocarbonate (CTA), controlling the reaction temperature at 60°C-70°C and the reaction time at 4h-5h to obtain CTA intercalated LDH;

[0013] S2. Add ethylene glycolate and tetrafluoroethylene into an ethanol solution, add CTA intercalated LDH and suspend it in the system, add free radical initiator benzoyl peroxide at 70°C-90°C, react for 120min-150min, filter, wash and solidify to obtain ethylene glycolate-tetrafluoroethylene copolymer / LDH composite fiber, i.e. composite fiber.

[0014] The usage ratio of ZnAl-LDH, CTA and toluene in step S1 is (2-4) g: (0.5-0.7) g: (10-20) mL.

[0015] In the step S2, the usage ratio of ethylene glycolate, tetrafluoroethylene, CTA intercalated LDH and benzoyl peroxide is (3-5): (2-4): (1-3): (0.1-0.3).

[0016] Further, the filling material is prepared by the following steps:

[0017] Add vinylidene chloride to a toluene solution, add calcium peroxide, control the reaction temperature at 60°C-70°C, stir, react for 60min-90min, move the system into a nano homogenizer, add methylstannane, disperse at 4000rpm-4500rpm for 30min-40min, filter, wash, and dry to obtain nano-scale polyvinylidene fluoride, i.e., a filling material.

[0018] The usage ratio of vinylidene chloride, toluene, calcium peroxide and methylstannane is (3-5): (20-30) mL: (0.5-0.7) g: (0.01-0.03) g.

[0019] A method for preparing a wiping cloth comprises the following steps:

[0020] Spray the outer side of the base fabric penetration layer and base fabric wiping layer with pressure-sensitive adhesive at a spraying amount of 15g / m 2 -25g / m 2, and overlap accordingly, and after pressing, a wiping cloth is obtained.

[0021] Beneficial effects of the present invention:

[0022] 1. In the technical solution of the present invention, the molecular structure of ethylene glycol-tetrafluoroethylene copolymer has high stability and chemical inertness, and is not easy to react with external chemical substances. Therefore, it can resist the corrosion of various chemical substances. LDH is compounded with this fiber material, and the cations on its layer plate can be exchanged with ions in the surrounding environment, so that it has good adsorption and ion exchange properties. At the same time, nano-scale polyvinylidene fluoride also has good chemical corrosion resistance and can resist the corrosion of various chemical substances.

[0023] 2. In the technical solution of the present invention, the unique layered three-dimensional structure of ethylene glycol-tetrafluoroethylene copolymer / LDH composite fiber gives the material higher strength and toughness, and nano-scale polyvinylidene fluoride is attached to the gaps in the structure, effectively preventing water vapor, carbon dioxide and oxygen or other corrosive media in the air from inducing LDH corrosion through the structural gaps, thereby destroying the unique layered three-dimensional structure of the composite fiber and improving the stability of the material. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1

[0026] The composite fiber is prepared by the following steps:

[0027] S1, dispersing 2 g of zinc aluminum layered double hydroxide (ZnAl-LDH) into 10 mL of toluene solution containing 0.5 g of RAFT agent S,S'-p-(α,α'-dimethyl-α"-acetic acid) trithiocarbonate (CTA), controlling the reaction temperature to 70°C and the reaction time to 5 h, to obtain CTA intercalated LDH;

[0028] S2. Add 3g of ethylene glycolate and 2g of tetrafluoroethylene into an ethanol solution, add 1g of CTA intercalated LDH and suspend it in the system, add 0.1g of free radical initiator benzoyl peroxide at 90°C, react for 150min, filter, wash, and solidify to obtain ethylene glycolate-tetrafluoroethylene copolymer / LDH composite fiber, i.e., composite fiber.

[0029] Example 2

[0030] The composite fiber is prepared by the following steps:

[0031] S1, 3 g zinc aluminum layered double hydroxide (ZnAl-LDH) was dispersed into 15 mL toluene solution containing 0.6 g RAFT agent S, S'-p-(α, α'-dimethyl-α"-acetic acid) trithiocarbonate (CTA), and the reaction temperature was controlled at 70 ° C and the reaction time was 5 h to obtain CTA intercalated LDH;

[0032] S2. Add 4g of ethylene glycolate and 3g of tetrafluoroethylene into an ethanol solution, add 2g of CTA intercalated LDH and suspend it in the system, add 0.2g of free radical initiator benzoyl peroxide at 90°C, react for 150min, filter, wash, and solidify to obtain ethylene glycolate-tetrafluoroethylene copolymer / LDH composite fiber, i.e., composite fiber.

[0033] Example 3

[0034] The composite fiber is prepared by the following steps:

[0035] S1, dispersing 4 g of zinc aluminum layered double hydroxide (ZnAl-LDH) into 20 mL of toluene solution containing 0.7 g of RAFT agent S,S'-p-(α,α'-dimethyl-α"-acetic acid) trithiocarbonate (CTA), controlling the reaction temperature to 70°C and the reaction time to 5 h, to obtain CTA intercalated LDH;

[0036] S2. Add 5g of ethylene glycolate and 4g of tetrafluoroethylene into an ethanol solution, add 3g of CTA intercalated LDH and suspend it in the system, add 0.3g of free radical initiator benzoyl peroxide at 90°C, react for 150min, filter, wash, and solidify to obtain ethylene glycolate-tetrafluoroethylene copolymer / LDH composite fiber, i.e., composite fiber.

[0037] Example 4

[0038] The filling material is prepared by the following steps:

[0039] Add 3 g of vinylidene chloride to 20 mL of toluene solution, add 0.5 g of calcium peroxide, control the reaction temperature at 70°C, stir, react for 90 minutes, move the system into a nano homogenizer, add 0.01 g of methylstannane, disperse at 4500 rpm for 40 minutes, filter, wash, and dry to obtain nano-scale polyvinylidene fluoride, i.e., the filling material.

[0040] Example 5

[0041] The filling material is prepared by the following steps:

[0042] Add 4 g of vinylidene chloride to 25 mL of toluene solution, add 0.6 g of calcium peroxide, control the reaction temperature at 70°C, stir, react for 90 minutes, move the system into a nano homogenizer, add 0.02 g of methylstannane, disperse at 4500 rpm for 40 minutes, filter, wash, and dry to obtain nano-scale polyvinylidene fluoride, i.e., the filling material.

[0043] Example 6

[0044] The filling material is prepared by the following steps:

[0045] Add 5 g of vinylidene chloride to 30 mL of toluene solution, add 0.7 g of calcium peroxide, control the reaction temperature at 70°C, stir, react for 90 minutes, move the system into a nano homogenizer, add 0.03 g of methylstannane, disperse at 4500 rpm for 40 minutes, filter, wash, and dry to obtain nano-scale polyvinylidene fluoride, i.e., the filling material.

[0046] Example 7

[0047] The base fabric wiping layer comprises the following steps to prepare:

[0048] The filling material prepared in Example 4 is used as an excitatory charge enhancer, and the composite fiber matrix polymer prepared in Example 1 is used to prepare an electret nanofiber membrane through electrospinning in-situ charging technology, and the base cloth wiping layer is obtained after edge sealing.

[0049] A method for preparing a wiping cloth comprises the following steps:

[0050] The outer sides of the base fabric penetration layer and the base fabric wiping layer prepared in this embodiment are sprayed with pressure-sensitive adhesive at a spraying amount of 15 g / m 2 -25g / m 2 , and overlap accordingly, and after pressing, a wiping cloth is obtained.

[0051] Example 8

[0052] The base fabric wiping layer comprises the following steps to prepare:

[0053] The filling material prepared in Example 5 is used as an excitatory charge enhancer, and the composite fiber matrix polymer prepared in Example 2 is used to prepare an electret nanofiber membrane through electrospinning in-situ charging technology, and the base cloth wiping layer is obtained after edge sealing.

[0054] A method for preparing a wiping cloth comprises the following steps:

[0055] The outer sides of the base fabric penetration layer and the base fabric wiping layer prepared in this embodiment are sprayed with pressure-sensitive adhesive at a spraying amount of 15 g / m 2 -25g / m 2 , and overlap accordingly, and after pressing, a wiping cloth is obtained.

[0056] Example 9

[0057] The base fabric wiping layer comprises the following steps to prepare:

[0058] The filling material prepared in Example 6 is used as an excitatory charge enhancer, and the composite fiber matrix polymer prepared in Example 3 is used to prepare an electret nanofiber membrane through electrospinning in-situ charging technology, and the base cloth wiping layer is obtained after edge sealing.

[0059] A method for preparing a wiping cloth comprises the following steps:

[0060] The outer sides of the base fabric penetration layer and the base fabric wiping layer prepared in this embodiment are sprayed with pressure-sensitive adhesive at a spraying amount of 15 g / m 2 -25g / m 2 , and overlap accordingly, and after pressing, a wiping cloth is obtained.

[0061] Comparative Example 1

[0062] The outer side of the base fabric penetration layer and the base fabric wiping layer made of polyethylene glycolate as raw material is sprayed with pressure-sensitive adhesive at a spraying amount of 15g / m 2 -25g / m 2 , and overlap and press them accordingly.

[0063] Comparative Example 2

[0064] The outer side of the base fabric penetration layer and the base fabric wiping layer made of polyester fiber is sprayed with pressure-sensitive adhesive at a spraying amount of 15g / m 2 -25g / m 2 , and overlap and press them accordingly.

[0065] The wiping cloths prepared in Examples 7-9 and Comparative Examples 1-2 were tested with reference to some technical indicators of FZ / T64056-2015 "Clean Room Wiping Cloths", and the results are shown in Table 1:

[0066] Table 1. Some technical indicators of Examples 7-9 and Comparative Examples 1-2

[0067]

[0068] As can be seen from Table 1, some technical indicators of Examples 7-9 are better than some technical indicators of Comparative Examples 1-2, indicating that the comprehensive performance of the wiping cloth is significantly improved by using nano-scale polyvinylidene fluoride as an excitatory charge enhancer and a composite fiber matrix polymer to prepare an electret nanofiber membrane through electrospinning in-situ charging technology, which meets the Class A / Class I standards.

[0069] The wiping cloths prepared in Examples 7-9 and Comparative Examples 1-2 were subjected to a dynamic condition immersion test. The wiping cloths were placed in different corrosive media, and the quality differences before and after the test of each corrosive medium were recorded. The results are shown in Table 2:

[0070] Table 2. Differences in quality of the corrosive media in Examples 7-9 and Comparative Examples 1-2

[0071]

[0072] It can be seen from Table 2 that the mass difference of Examples 7-9 in various corrosive media is smaller than that of Comparative Examples 1-2, indicating that the chemical corrosion resistance of Examples 7-9 is better than that of Comparative Examples 1-2. Nanoscale polyvinylidene fluoride is attached to the gaps in the structure, which can effectively prevent the corrosive media from inducing LDH corrosion through the structural gaps, thereby destroying the unique layered three-dimensional structure of the composite fiber.

[0073] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0074] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A wiping cloth, characterized in that: It includes a base fabric penetration layer and a base fabric wiping layer, wherein the base fabric penetration layer is made by combing a mixture of polypropylene filaments and polypropylene staple fibers, and the base fabric wiping layer refers to a fiber membrane in which a filling material is dispersed in composite fibers.

2. A wiping cloth according to claim 1, characterized in that: The composite fiber refers to ethylene glycol-tetrafluoroethylene copolymer / LDH composite fiber, and the filling material refers to nano-grade polyvinylidene fluoride.

3. A wiping cloth according to claim 1, characterized in that: The base fabric wiping layer comprises the following steps to prepare: The filling material is an excitatory charge enhancer and a composite fiber matrix polymer. An electret nanofiber membrane is prepared by electrospinning in-situ charging technology, and a base cloth wiping layer is obtained after edge sealing.

4. A wiping cloth according to claim 1, characterized in that: The composite fiber is prepared by the following steps: S1, dispersing zinc aluminum layered double hydroxide (ZnAl-LDH) into a toluene solution containing RAFT agent S,S'-p-(α,α'-dimethyl-α"-acetic acid) trithiocarbonate (CTA), controlling the reaction temperature at 60°C-70°C and the reaction time at 4h-5h to obtain CTA intercalated LDH; S2. Add ethylene glycolate and tetrafluoroethylene into an ethanol solution, add CTA intercalated LDH and suspend it in the system, add free radical initiator benzoyl peroxide at 70°C-90°C, react for 120min-150min, filter, wash and solidify to obtain ethylene glycolate-tetrafluoroethylene copolymer / LDH composite fiber, i.e. composite fiber.

5. A wiping cloth according to claim 4, characterized in that: The usage ratio of ZnAl-LDH, CTA and toluene in step S1 is (2-4) g: (0.5-0.7) g: (10-20) mL.

6. A wiping cloth according to claim 4, characterized in that: In step S2, the usage ratio of ethylene glycolate, tetrafluoroethylene, CTA intercalated LDH and benzoyl peroxide is (3-5): (2-4): (1-3): (0.1-0.3).

7. A wiping cloth according to claim 1, characterized in that: The filling material is prepared by the following steps: Add vinylidene chloride to a toluene solution, add calcium peroxide, control the reaction temperature at 60°C-70°C, stir, react for 60min-90min, move the system into a nano homogenizer, add methylstannane, disperse at 4000rpm-4500rpm for 30min-40min, filter, wash, and dry to obtain nano-scale polyvinylidene fluoride, i.e., a filling material.

8. A wiping cloth according to claim 7, characterized in that: The dosage ratio of vinyl chloride, toluene, calcium peroxide and methylstannane is (3-5): (20-30) mL: (0.5-0.7) g: (0.01-0.03) g.

9. A method for preparing a wiping cloth according to any one of claims 1 to 8, characterized in that: The following steps are involved: Spray the outer side of the base fabric penetration layer and base fabric wiping layer with pressure-sensitive adhesive at a spraying amount of 15g / m 2 -25g / m 2 , and overlap accordingly, and after pressing, a wiping cloth is obtained.

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