Nonwoven wiping material based on water-reduced opening process and method for manufacturing the same

Abstract

The application discloses a kind of based on water reduction opening process of non-woven fabric wiping material and its preparation method, preparation method includes the following steps: step one, the fiber of non-woven fabric is reinforced by water jet method;Step two, the non-woven fabric treated in step one is immersed in water-based polyurethane emulsion with solid content of 50%, the impregnation amount is 10%~50%, the impregnation time is, after completing impregnation, it is placed in 120 DEG C oven and dried to constant weight;Step three, the non-woven fabric treated in step two is placed in hot water at 70~95 DEG C for reduction opening, wherein the water amount is 10 times the weight of non-woven fabric, the opening time is 10~60min, after opening, the non-woven fabric is washed;Can effectively improve the wear resistance and corrosion resistance of non-woven fabric, while improving its defect of linting, used as wiping material, the cleaning effect is good, can be recycled, and preparation process is simple, raw material and waste treatment cost is low.

Description

Technical Field

[0001] This invention belongs to the field of nonwoven fabric technology, specifically relating to a nonwoven wiping material based on a water-reducing fiber opening process and its preparation method. Background Technology

[0002] Currently, wiping materials mainly fall into three categories: woven fabrics, knitted fabrics, and non-woven fabrics. Woven fabrics are not durable, difficult to clean, have poor stain removal ability, are weak in removing particulate dirt and dust, and have a rough feel, easily scratching surfaces. Knitted fabrics are prone to shedding, have poor water absorption, weak stain removal ability, poor durability, and are more expensive. Traditional non-woven wiping materials are mostly processed using chemical bonding, thermal bonding, needle punching, hydroentangling, or wet processes. They primarily use island-type microfibers, which are more difficult to spin, resulting in higher costs. Furthermore, in the processing of microfiber wiping cloths, the fabric needs to undergo alkali reduction fiber opening treatment. After alkali reduction fiber opening, a napping treatment is performed to obtain wiping cloths with extremely strong surface adsorption capacity. The treatment of fibers with strong alkalis results in a significant loss of strength in microfibers, leading to a loose structure, easy shedding, low strength, and poor durability. Furthermore, the use of strong alkaline solutions during the fiber opening process results in high organic content, making recycling difficult and causing high production costs and environmental pollution. During fiber opening, the alkali dissolves the marine components in the sea island fibers, reducing the utilization rate of the raw fiber by 20%–30%, thus increasing costs. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a nonwoven fabric wiping material based on a water-reduced fiber opening process and its preparation method. This material can effectively improve the wear resistance and corrosion resistance of nonwoven fabrics, while also mitigating their lint-shedding defects. It provides good cleaning performance as a wiping material, can be recycled multiple times, and has a simple preparation process with low raw material and waste treatment costs.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A method for preparing a nonwoven wiping material based on a water-reducing fiber opening process includes the following steps:

[0006] Step 1: Reinforce the fibers of the nonwoven fabric using hydroentangling.

[0007] Step 2: Impregnate the nonwoven fabric treated in Step 1 with an aqueous polyurethane emulsion with a solid content of 50%, with an impregnation amount of 10% to 50%, for 5 to 10 minutes. After impregnation, place it in an oven at 120°C and dry it to constant weight.

[0008] Step 3: Place the nonwoven fabric treated in Step 2 in hot water at 70-95℃ for weight reduction and fiber opening, where the amount of water is 10 times the weight of the nonwoven fabric, and the fiber opening time is 10-60 minutes. After the fiber opening is completed, wash the nonwoven fabric with water.

[0009] The present invention also has the following technical features:

[0010] Preferably, the nonwoven fabric is a fixed-island fiber nonwoven fabric made of polyvinyl alcohol and polyester as raw materials, which is spun into a composite spun fabric with polyvinyl alcohol fiber as the "sea component" and polyester fiber as the "island component".

[0011] Preferably, the average molecular weight of the waterborne polyurethane described in step two is 6000.

[0012] Preferably, the washing in step three involves immersing the nonwoven fabric in hot water at 80°C for 1 to 3 times.

[0013] This invention also protects a nonwoven wiping material prepared by the method described above.

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

[0015] The island-type sea-island fiber nonwoven fabric of the present invention is made of polyvinyl alcohol and polyester composite spinning. The polyvinyl alcohol fiber is soluble in hot water to complete the fiber reduction and opening. After the polyvinyl alcohol fiber is removed, the polyester fiber is left. The polyester microfiber nonwoven fabric is impregnated with water-based polyurethane, which can effectively improve the wear resistance and corrosion resistance of the nonwoven fabric. At the same time, it can also effectively solve the defect of shedding. It has a good cleaning effect when used as a wiping material and can be recycled multiple times.

[0016] This invention reinforces the fibers of nonwoven fabrics using a hydroentangling method, making the fibers of the nonwoven fabrics softer and less likely to scratch the surface of objects when used as a wiping material.

[0017] This invention replaces the alkali-based fiber reduction process with a water-based fiber reduction process. The fiber reduction method is simple, does not use strong alkaline solutions, and can be completed using only hot water. It is suitable for mass production and has lower raw material and waste treatment costs. Attached Figure Description

[0018] Figure 1 This is a SEM image of the polyester / polyvinyl alcohol island fiber nonwoven fabric raw material used in Example 1;

[0019] Figure 2 This is a SEM image of the polyester / polyvinyl alcohol island fiber nonwoven fabric in Example 1 after being impregnated with water-soluble polyurethane.

[0020] Figure 3This is a SEM image of the nonwoven fabric (polyester / polyvinyl alcohol) / waterborne polyurethane composite material in Example 1 after fiber reduction and opening.

[0021] Figure 4 The image shows the SEM images of the nonwoven fabric (polyester / polyvinyl alcohol) / waterborne polyurethane composite material in Example 1 after three water washes following fiber reduction and opening. Detailed Implementation

[0022] The specific content of the present invention will be further explained in detail below with reference to the embodiments.

[0023] The nonwoven fabrics used in the following embodiments are composite spinning nonwoven fabrics made of polyvinyl alcohol and polyester, with polyvinyl alcohol fiber as the "sea component" and polyester fiber as the "island component".

[0024] The waterborne polyurethane used in the following examples is model 1140, with a solid content of 50% and an average molecular weight of 6000.

[0025] Impregnation amount refers to the mass of the base fabric as a unit 1, and the mass of waterborne polyurethane is 10% to 50% of it.

[0026] Example 1

[0027] Step 1: Reinforce the fibers of the nonwoven fabric using hydroentangling.

[0028] Step 2: Impregnate the nonwoven fabric treated in Step 1 with an aqueous polyurethane emulsion with a solid content of 50%, with an impregnation amount of 30% and an impregnation time of 5 minutes. After impregnation, place it in an oven at 120°C and dry it to constant weight.

[0029] Step 3: Place the nonwoven fabric treated in Step 2 into hot water at 80℃ for weight reduction and fiber opening. The amount of water is 10 times the weight of the nonwoven fabric, and the fiber opening time is 40 minutes. After the fiber opening is completed, wash the nonwoven fabric three times in hot water at 80℃.

[0030] Example 2

[0031] Step 1: Reinforce the fibers of the nonwoven fabric using hydroentangling.

[0032] Step 2: Impregnate the nonwoven fabric treated in Step 1 with an aqueous polyurethane emulsion with a solid content of 50%, with an impregnation amount of 10% and an impregnation time of 6 minutes. After impregnation, place it in an oven at 120°C and dry it to constant weight.

[0033] Step 3: Place the nonwoven fabric treated in Step 2 into hot water at 70℃ for weight reduction and fiber opening, where the amount of water is 10 times the weight of the nonwoven fabric, and the fiber opening time is 10 minutes. After the fiber opening is completed, wash the nonwoven fabric once in hot water at 80℃.

[0034] Example 3

[0035] Step 1: Reinforce the fibers of the nonwoven fabric using hydroentangling.

[0036] Step 2: Impregnate the nonwoven fabric treated in Step 1 with a water-based polyurethane emulsion with a solid content of 50%, with an impregnation amount of 20% and an impregnation time of 8 minutes. After impregnation, place it in an oven at 120°C and dry it to constant weight.

[0037] Step 3: Place the nonwoven fabric treated in Step 2 into hot water at 85℃ for weight reduction and fiber opening, where the amount of water is 10 times the weight of the nonwoven fabric, and the fiber opening time is 30 minutes. After the fiber opening is completed, wash the nonwoven fabric once in hot water at 80℃.

[0038] Example 4

[0039] Step 1: Reinforce the fibers of the nonwoven fabric using hydroentangling.

[0040] Step 2: Impregnate the nonwoven fabric treated in Step 1 with an aqueous polyurethane emulsion with a solid content of 50%, with an impregnation amount of 40% and an impregnation time of 10 minutes. After impregnation, place it in an oven at 120°C and dry it to constant weight.

[0041] Step 3: Place the nonwoven fabric treated in Step 2 into hot water at 95℃ for weight reduction and fiber opening, where the amount of water is 10 times the weight of the nonwoven fabric, and the fiber opening time is 50 minutes. After the fiber opening is completed, wash the nonwoven fabric twice in hot water at 80℃.

[0042] Example 5

[0043] Step 1: Reinforce the fibers of the nonwoven fabric using hydroentangling.

[0044] Step 2: Impregnate the nonwoven fabric treated in Step 1 with an aqueous polyurethane emulsion with a solid content of 50%, with an impregnation amount of 50% and an impregnation time of 10 minutes. After impregnation, place it in an oven at 120°C and dry it to constant weight.

[0045] Step 3: Place the nonwoven fabric treated in Step 2 into hot water at 90℃ for weight reduction and fiber opening, where the amount of water is 10 times the weight of the nonwoven fabric, and the fiber opening time is 60 minutes. After the fiber opening is completed, wash the nonwoven fabric three times in hot water at 80℃.

[0046] Testing mechanical properties and softness:

[0047] The nonwoven wiping materials prepared in Examples 1 to 4 were subjected to mechanical property tests and softness tests, respectively, according to the national standard GB / T8949-2008. Abrasion resistance tests were also conducted, using an electronic balance to measure the weight before and after wear, and calculating the weight loss rate. The test results are shown in Table 1.

[0048] Tensile strength (MPa) 11.59 10.48 10.74 10.98 Tear strength (N / mm) 76.5 52.2 58.4 56.8 Softness (mm) 8.7 6.6 7.4 6.9 Wear-induced weight loss rate (%) 0.9 4.4 1.9 1.1

[0049] The results show that the ultrafine fiber nonwoven wiping material of Example 1 obtained by water reduction in this invention has the best mechanical properties, the best softness, the lowest wear weight reduction rate, the strongest wear resistance, good durability, and can be used multiple times. It has good quality and service life and can be used multiple times.

[0050] In summary, the water-reducing microfiber nonwoven wiping material of the present invention, impregnated with water-based polyurethane, effectively improves the wear resistance and corrosion resistance of the wiping material, while reducing lint shedding. After being napped, the nonwoven fabric has good water absorption properties, increasing the cleaning effect of the wiping cloth.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications and equivalent substitutions made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a nonwoven wiping material based on a water-reducing fiber opening process, characterized in that, Includes the following steps: Step 1: Reinforce the fibers of the nonwoven fabric using hydroentangling. Step 2: Impregnate the nonwoven fabric treated in Step 1 with an aqueous polyurethane emulsion with a solid content of 50%, with an impregnation amount of 10%~50%, for 5~10 minutes. After impregnation, place it in an oven at 120℃ and dry it to constant weight. Step 3: Place the nonwoven fabric treated in Step 2 in hot water at 70~95℃ for weight reduction and fiber opening, where the water volume is 10 times the weight of the nonwoven fabric, and the fiber opening time is 10~60 minutes. After the fiber opening is completed, wash the nonwoven fabric with water. The nonwoven fabric is made of polyvinyl alcohol and polyester as raw materials, and is composite spun into an island-type sea-island fiber nonwoven fabric with polyvinyl alcohol fiber as the "sea component" and polyester fiber as the "island component".

2. The method for preparing nonwoven wiping material based on water-reducing fiber opening technology as described in claim 1, characterized in that, The average molecular weight of the waterborne polyurethane mentioned in step two is 6000.

3. The method for preparing nonwoven wiping material based on water-reducing fiber opening technology as described in claim 1, characterized in that, The water washing mentioned in step three involves immersing the nonwoven fabric in hot water at 80°C for 1 to 3 times.

4. A nonwoven wiping material prepared by the method described in any one of claims 1 to 3.

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