Preparation method of low-carbon environment-friendly bio-based nylon gloves

Abstract

The invention belongs to the technical field of gloves, and particularly relates to a preparation method of low-carbon environment-friendly bio-based nylon gloves, which comprises the following steps: S1, uniformly stirring a basic sizing material and an auxiliary agent according to a ratio, the sizing material composition being selected from one of a butadiene-acrylonitrile rubber composition, a latex composition and a polyurethane rubber composition; s2, the bio-based nylon yarn serves as a core raw material and is matched with at least one kind of yarn of polyester yarn, nylon yarn and anti-cutting yarn, the glove liner is formed through knitting by a computer knitting machine, and the glove liner is arranged on the hand mold in a sleeving mode. The bio-based nylon wires are adopted as core raw materials of the glove inner container, traditional petroleum-based nylon is replaced, dependence on non-renewable fossil resources is reduced, carbon emission in the full life cycle of production is reduced, and the requirements for low carbon and environmental protection are met.

Description

Technical Field

[0001] This invention belongs to the field of glove technology, and in particular relates to a method for preparing a low-carbon and environmentally friendly bio-based nylon glove. Background Technology

[0002] Gloves are a common protective and work-related item, and their demand continues to grow. Nitrile gloves, latex gloves, and polyurethane gloves are widely used in industrial production, medical protection, and daily life due to their superior performance. However, current glove manufacturing processes and materials present several problems that urgently need to be addressed. On the one hand, the core raw material of traditional glove liner is mostly petroleum-based nylon, whose production relies on non-renewable fossil resources and has high carbon emissions throughout its life cycle. It is also difficult to degrade after disposal, easily causing environmental pollution. On the other hand, in existing production processes, insufficient rationality of rubber compound ratios and improper control of dipping parameters often lead to uneven adhesion of the glove film, affecting protective performance. Some processes use coagulants containing highly volatile organic solvents, which pollute the environment after volatilization. Furthermore, the recycling rate of waste rubber, defective gloves, and other waste materials is low, resulting in resource waste. At the same time, existing processes have poor adaptability to different rubber compound compositions, and a single process cannot meet the performance requirements of different types of gloves, resulting in insufficient production flexibility. Some processes have high energy consumption, further increasing the environmental burden.

[0003] To address the aforementioned technical challenges, there is an urgent need to develop a manufacturing method that utilizes renewable resources as raw materials, employs optimized processes, is low-carbon and environmentally friendly, and ensures glove performance. Bio-based nylon, using renewable biomass resources, offers advantages such as low carbon emissions and biodegradability. Applying it to glove lining manufacturing, combined with optimized processes tailored to different rubber compositions, can effectively reduce the environmental impact of glove production while simultaneously improving overall product performance, meeting market demand for environmentally friendly protective equipment. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned technical problems by providing a method for preparing low-carbon and environmentally friendly bio-based nylon gloves.

[0005] In view of this, the present invention provides a method for preparing a low-carbon and environmentally friendly bio-based nylon glove, comprising the following steps: S1, mix the base rubber compound and the additives in a certain proportion until uniform, wherein the rubber compound composition is selected from one of nitrile rubber composition, latex composition, and polyurethane rubber composition; S2, using bio-based nylon yarn as the core material, combined with at least one yarn from polyester yarn, nylon yarn, and cut-resistant yarn, is woven into a glove liner by a computer knitting machine, and the glove liner is then fitted onto the hand mold; S3, Immerse the hand mold with the glove liner inside into the glue tank so that the glove liner surface is evenly coated with glue. S4. The gloves after being dipped in adhesive are surface treated using an adhesive curing process or an anti-slip powder spraying process. S5. Place the gloves that have undergone anti-slip treatment in an oven to dry. S6, send the gloves that have been dried in the first stage into the washing tank for spraying, soaking or skipping this step; S7, Second stage drying: Dry the gloves that have been soaked or not soaked; S8, Place the gloves dried in the second stage into a vulcanizing equipment for vulcanization treatment or skip this step; S9. Remove the vulcanized or unvulcanized gloves from the mold, and package the qualified products into the warehouse after inspection.

[0006] Furthermore, the bio-based nylon filament is at least one of bio-based nylon 6, bio-based nylon 11, bio-based nylon 1010, or bio-based nylon 66.

[0007] Furthermore, the bio-based nylon filament has a bio-based content of ≥60% and a linear density of 12–52 tex.

[0008] Furthermore, the needle type of the computer knitting machine mentioned in step S2 is 7-needle, 8-needle, 10-needle, 13-needle, 15-needle or 18-needle, and the knitting density is 50 to 200 stitches / 10cm.

[0009] Furthermore, in step S3, the temperature of the adhesive liquid in the adhesive tank is 15-35℃, the immersion time is 7-17 seconds, the rotation speed of the hand mold is 20-65 revolutions / minute, and the thickness of the adhesive film is 0.12-0.52mm.

[0010] Furthermore, the adhesive curing process in step S4 is as follows: the glue-impregnated gloves are placed in a UV curing device and irradiated for 5 to 15 seconds at a wavelength of 365–405 nm and a power of 80–150 W; the anti-slip powder is a mixture of salt and sodium sulfate, wherein the salt accounts for 20%–30% and the sodium sulfate accounts for 70%–80%.

[0011] Furthermore, in step S5, the first stage drying temperature is 50-70℃ and the drying time is 15-30 minutes; in step S7, the second stage drying temperature is 80-120℃ and the drying time is 20-90 minutes.

[0012] Furthermore, in step S8, the vulcanization temperature is 100–120°C, and the vulcanization time is 20–40 minutes.

[0013] Furthermore, in step S1, the rubber composition is stirred using a closed stirring device with a stirring speed of 60-120 rpm and a stirring time of 20-40 minutes; the waste rubber adhering to the inner wall of the stirring device is crushed to 100-200 mesh and then added to the new rubber composition at a mass ratio of 5%-8%.

[0014] Furthermore, when the rubber composition is a nitrile rubber composition or a latex composition, step S3 includes a coagulant treatment before the impregnation operation. The coagulant is composed of 0%–11% calcium nitrate, 83%–95% solvent, and 0.1%–5.2% glacial acetic acid, and the coagulant treatment time is 4–7 seconds. When the rubber composition is a polyurethane rubber composition, the impregnation operation is performed directly in step S3.

[0015] The beneficial effects of this invention are: Using bio-based nylon yarn as the core material for glove lining replaces traditional petroleum-based nylon, reducing dependence on non-renewable fossil resources and lowering carbon emissions throughout the production lifecycle, thus meeting the needs of low-carbon and environmental protection. Detailed Implementation

[0016] The technical solutions in the embodiments of this application will be clearly described below. Obviously, the described embodiments are only some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application are within the scope of protection of this application.

[0017] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0018] A method for preparing a low-carbon and environmentally friendly bio-based nylon glove includes the following steps: S1, mix the base rubber compound and the additives in a certain proportion until uniform, wherein the rubber compound composition is selected from one of nitrile rubber composition, latex composition, and polyurethane rubber composition; S2, using bio-based nylon yarn as the core material, combined with at least one yarn from polyester yarn, nylon yarn, and cut-resistant yarn, is woven into a glove liner by a computer knitting machine, and the glove liner is then fitted onto the hand mold; S3, Immerse the hand mold with the glove liner inside into the glue tank so that the glove liner surface is evenly coated with glue. S4. The gloves after being dipped in adhesive are surface treated using an adhesive curing process or an anti-slip powder spraying process. S5. Place the gloves that have undergone anti-slip treatment in an oven to dry. S6, send the gloves that have been dried in the first stage into the washing tank for spraying, soaking or skipping this step; S7, Second stage drying: Dry the gloves that have been soaked or not soaked; S8, Place the gloves dried in the second stage into a vulcanizing equipment for vulcanization treatment or skip this step; S9. Remove the vulcanized or unvulcanized gloves from the mold, and package the qualified products into the warehouse after inspection.

[0019] This invention uses bio-based nylon yarn as the core raw material for glove lining, replacing traditional petroleum-based nylon, reducing dependence on non-renewable fossil resources, reducing carbon emissions throughout the production life cycle, and meeting the needs of low-carbon and environmental protection. It covers three types of rubber compounds: nitrile rubber, latex rubber, and polyurethane rubber. By setting optional soaking and vulcanization steps, it can achieve precise adaptation to different rubber compounds, improving process versatility and production flexibility.

[0020] In the examples of this application, the bio-based nylon filament is at least one of bio-based nylon 6, bio-based nylon 11, bio-based nylon 1010, or bio-based nylon 66.

[0021] These bio-based nylons possess excellent mechanical strength, flexibility, and biocompatibility, which can meet the weaving and processing requirements of glove linings, ensuring that the linings are not easily broken or deformed. The selected bio-based nylon materials all have good biodegradability and low carbon properties, and have good interfacial bonding with nitrile rubber, latex, and polyurethane adhesives, laying the foundation for the smooth progress of the subsequent impregnation process and the improvement of the overall performance of the gloves.

[0022] In the example of this application, the bio-based nylon filament has a bio-based content of ≥60% and a linear density of 12-52 tex.

[0023] Bio-based nylon yarn has a bio-based content of ≥60%, ensuring low-carbon and environmentally friendly properties at the raw material level, significantly reducing the carbon emission intensity of glove production, and the high bio-based content makes the gloves easier to degrade after disposal, reducing residual environmental pollution. The linear density is limited to 12-52 tex. This range of linear density is highly compatible with the knitting process of computer knitting machines. It can ensure the structural density of the glove liner and provide a good protective foundation, while avoiding the problems of excessive linear density leading to heavy gloves and poor comfort, or insufficient linear density leading to insufficient strength of the liner.

[0024] In the example of this application, the needle type of the computer knitting machine in step S2 is 7 needles, 8 needles, 10 needles, 13 needles, 15 needles or 18 needles, and the knitting density is 50 to 200 needles / 10cm.

[0025] Different needle types can be adapted to glove liner with different thicknesses and aperture requirements, meeting the production needs of gloves for different purposes such as protective and comfort. The knitting density is limited to 50-200 stitches / 10cm. By adjusting the knitting density, the breathability and protection of the glove liner can be flexibly controlled: high-density knitting (120-200 stitches / 10cm) can improve the glove's cut and puncture resistance, and is suitable for industrial protection scenarios; low-density knitting (50-100 stitches / 10cm) enhances the glove's breathability and wearing comfort, and is suitable for everyday use scenarios.

[0026] In the example of this application, in step S3, the temperature of the adhesive liquid in the adhesive tank is 15-35°C, the immersion time is 7-17 seconds, the rotation speed of the hand mold is 20-65 revolutions per minute, and the thickness of the adhesive film is 0.12-0.52 mm.

[0027] The combination of parameters, namely, adhesive temperature of 15-35℃, immersion time of 7-17 seconds, and hand mold rotation speed of 20-65 rpm, can ensure that the adhesive is evenly spread on the surface of the glove liner, avoiding defects such as uneven film thickness and air bubbles, and improving the glove's impermeability and abrasion resistance. The thickness of the adhesive film is limited to 0.12 to 0.52 mm. This thickness range ensures that the gloves have sufficient protective strength to resist the corrosion of external substances, while avoiding the gloves from becoming stiff and reducing operational flexibility due to excessive thickness, thus balancing protection and ease of use.

[0028] In the example of this application, the adhesive curing process in step S4 is as follows: the glue-impregnated gloves are placed in a UV curing device and irradiated for 5 to 15 seconds at a wavelength of 365–405 nm and a power of 80–150 W; the anti-slip powder is a mixture of salt and sodium sulfate, wherein the salt accounts for 20%–30% and the sodium sulfate accounts for 70%–80%.

[0029] The UV curing process (wavelength 365-405nm, power 80-150W, irradiation time 5-15 seconds) does not require the addition of chemical antislip agents, is environmentally friendly and pollution-free, and can quickly form a micro-convex antislip structure on the surface of the adhesive film, providing a long-lasting antislip effect while avoiding the environmental problems caused by antislip agent residue. The anti-slip powder is a mixture of salt (20%–30%) and sodium sulfate (70%–80%). This ratio provides the best adhesion and anti-slip performance. Salt and sodium sulfate are easily soluble in water and can be easily removed during subsequent soaking and washing, avoiding residual pollution. At the same time, the waste is easy to dispose of and is environmentally friendly.

[0030] In the example of this application, the drying temperature in the first stage of step S5 is 50-70°C and the drying time is 15-30 minutes; the drying temperature in the second stage of step S7 is 80-120°C and the drying time is 20-90 minutes.

[0031] The first stage of drying (50-70℃, 15-30 minutes) uses low-temperature drying, which can slowly remove free moisture and some volatile substances from the surface of the gloves, avoid premature curing and cracking of the adhesive film caused by high temperature, and ensure the bonding stability between the adhesive film and the inner liner. The second stage of drying (80-120℃, 20-90 minutes) adapts the temperature and time to the curing requirements of different adhesives, which can promote the initial cross-linking of the adhesives, improve the strength and stability of the adhesive film, and at the same time, reasonably control the drying time to avoid energy waste and take into account both production efficiency and energy saving requirements.

[0032] In the example of this application, the vulcanization temperature in step S8 is 100-120°C and the vulcanization time is 20-40 minutes.

[0033] The combination of vulcanization temperature of 100-120℃ and time of 20-40 minutes can promote the full cross-linking of raw rubber and vulcanizing agent in nitrile rubber and latex, forming a three-dimensional network structure, which significantly improves the tensile strength, elasticity, abrasion resistance and corrosion resistance of gloves, and extends the service life of gloves. Optimized vulcanization parameters avoid the problems of poor glove performance due to insufficient vulcanization or brittleness and reduced flexibility due to excessive vulcanization, ensuring the best overall glove performance.

[0034] In the example of this application, the mixing of the rubber composition in step S1 is carried out using a closed mixing equipment with a mixing speed of 20 to 120 rpm and a mixing time of 20 to 40 minutes; the waste rubber attached to the inner wall of the mixing equipment is crushed to 100 to 200 mesh and then added to the new rubber composition at a mass ratio of 5% to 8%.

[0035] The use of enclosed mixing equipment effectively reduces the volatilization of organic solvents during the mixing process of rubber compounds, lowers VOC emissions, reduces environmental pollution, and meets environmental protection standards. Waste rubber sheets are crushed (100-200 mesh) and then recycled at a mass ratio of 5%-8%, which improves the utilization rate of raw materials, reduces the generation of solid waste, and lowers production costs. At the same time, the recycled waste rubber sheets have good compatibility with new rubber materials and will not affect the overall performance of the rubber materials, further enhancing the low-carbon and environmentally friendly attributes of the process.

[0036] In the examples of this application, when the rubber composition is a nitrile rubber composition or a latex composition, step S3 includes a coagulant treatment before the impregnation operation. The coagulant is composed of 0%–11% calcium nitrate, 83%–95% solvent, and 0.1%–5.2% glacial acetic acid. The coagulant treatment time is 4–7 seconds. When the rubber composition is a polyurethane rubber composition, the impregnation operation is performed directly in step S3.

[0037] For nitrile rubber and latex compositions, a coagulant treatment (4-7 seconds) is applied. The coagulant formula (0%-11% calcium nitrate, 83%-95% solvent, and 0.1%-5.2% glacial acetic acid) can effectively prevent the rubber from penetrating into the inner lining of the glove, ensuring the structural integrity and protective performance of the glove, while reducing the amount of glacial acetic acid used and reducing volatile pollution. The polyurethane adhesive composition can be directly impregnated, taking advantage of its ability to bond well with the inner liner without the need for a coagulant. This eliminates unnecessary steps, improves production efficiency, and avoids the environmental pressure and increased costs associated with the use of coagulants. It also enables differentiated adaptation of different adhesive compositions, enhancing the targetedness and practicality of the process.

[0038] The embodiments of this application have been described above. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A method for preparing a low-carbon and environmentally friendly bio-based nylon glove, characterized in that, Includes the following steps: S1, mix the base rubber compound and the additives in a certain proportion until uniform, wherein the rubber compound composition is selected from one of nitrile rubber composition, latex composition, and polyurethane rubber composition; S2, using bio-based nylon yarn as the core material, combined with at least one yarn from polyester yarn, nylon yarn, and cut-resistant yarn, is woven into a glove liner by a computer knitting machine, and the glove liner is then fitted onto the hand mold; S3, Immerse the hand mold with the glove liner inside into the glue tank so that the glove liner surface is evenly coated with glue. S4. The gloves after being dipped in adhesive are surface treated using an adhesive curing process or an anti-slip powder spraying process. S5. Place the gloves that have undergone anti-slip treatment in an oven to dry. S6, send the gloves that have been dried in the first stage into the washing tank for spraying, soaking or skipping this step; S7, Second stage drying: Dry the gloves that have been soaked or not soaked; S8, Place the gloves dried in the second stage into a vulcanizing equipment for vulcanization treatment or skip this step; S9. Remove the vulcanized or unvulcanized gloves from the mold, and package the qualified products into the warehouse after inspection.

2. The method for preparing the low-carbon and environmentally friendly bio-based nylon glove according to claim 1, characterized in that, The bio-based nylon filament is made of at least one of bio-based nylon 6, bio-based nylon 11, bio-based nylon 1010, or bio-based nylon 66.

3. The method for preparing the low-carbon and environmentally friendly bio-based nylon glove according to claim 2, characterized in that, The bio-based nylon filament has a bio-based content of ≥60% and a linear density of 12–52 tex.

4. The method for preparing the low-carbon and environmentally friendly bio-based nylon glove according to claim 1, characterized in that, The computerized knitting machine described in step S2 has a needle type of 7, 8, 10, 13, 15 or 18 needles, and a knitting density of 50 to 200 stitches / 10cm.

5. The method for preparing a low-carbon and environmentally friendly bio-based nylon glove according to claim 1, characterized in that, In step S3, the temperature of the adhesive liquid in the adhesive tank is 15-35℃, the immersion time is 2-17 seconds, the rotation speed of the hand mold is 10-65 revolutions / minute, and the thickness of the adhesive film is 0.12-0.52mm.

6. The method for preparing a low-carbon and environmentally friendly bio-based nylon glove according to claim 1, characterized in that, The adhesive curing process in step S4 is as follows: the glue-impregnated gloves are placed in a UV curing device and irradiated for 5 to 15 seconds at a wavelength of 365–405 nm and a power of 80–150 W; the anti-slip powder is a mixture of salt and sodium sulfate, wherein the salt accounts for 20%–30% and the sodium sulfate accounts for 70%–80%.

7. The method for preparing a low-carbon and environmentally friendly bio-based nylon glove according to claim 1, characterized in that, In step S5, the first stage drying temperature is 50-70℃ and the drying time is 15-30 minutes; in step S7, the second stage drying temperature is 80-120℃ and the drying time is 20-90 minutes.

8. The method for preparing a low-carbon and environmentally friendly bio-based nylon glove according to claim 1, characterized in that, In step S8, the vulcanization temperature is 100–120°C and the vulcanization time is 20–40 minutes.

9. The method for preparing a low-carbon and environmentally friendly bio-based nylon glove according to claim 5, characterized in that, In step S1, the rubber composition is stirred using a closed stirring device with a stirring speed of 60-120 rpm and a stirring time of 20-40 minutes. The waste rubber adhering to the inner wall of the stirring device is crushed to 100-200 mesh and then added to the new rubber composition at a mass ratio of 5%-8%.

10. The method for preparing a low-carbon and environmentally friendly bio-based nylon glove according to claim 1, characterized in that, When the rubber composition is a nitrile rubber composition or a latex composition, step S3 includes a coagulant treatment before the impregnation operation. The coagulant is composed of 0%–11% calcium nitrate, 83%–95% solvent, and 0.1%–5.2% glacial acetic acid. The coagulant treatment time is 4–7 seconds. When the rubber composition is a polyurethane rubber composition, the impregnation operation is performed directly in step S3.