Antibacterial warm-keeping fabric based on diatom ooze coating and preparation method of antibacterial warm-keeping fabric

Abstract

The invention discloses an antibacterial warm-keeping fabric based on a diatom ooze coating and a preparation method thereof. The fabric is prepared by uniformly printing the diatom ooze coating on a fabric base material through a roller coating printing technology. The diatom ooze coating is prepared by adding an adhesive, a dispersing agent, a defoaming agent and water into coating powder and stirring, the coating powder comprises the following components in percentage by mass: powder A: 50%-70% of diatomite, 3%-8% of kaolin, 4%-7% of attapulgite and 4%-8% of calcium carbonate; the powder B is prepared from 5%-10% of nano magnesium oxide, 3%-5% of hollow glass beads, 2%-5% of nano titanium dioxide and 1%-3% of nano zinc oxide. The fabric with excellent thermal insulation performance, antibacterial performance and durability is prepared by optimally matching material components in the diatom ooze coating and sensitizing part of powder with a silane coupling agent. The fabric not only has antibacterial and warm-keeping functions, but also improves the comfort level of a human body, and has wide market prospects and application values.

Description

Technical Field

[0001] The invention belongs to the technical field of textile fabrics and relates to an antibacterial thermal insulation fabric based on diatom mud coating and a preparation method thereof. Background Art

[0002] With the improvement of people's living standards and the enhancement of environmental awareness, the requirements for textile fabrics are getting higher and higher. Traditional thermal insulation fabrics often have problems such as being thick and bloated, poor thermal insulation effect, poor environmental performance, and easy aging. The main component of diatom mud is diatomite, which is a biological siliceous sedimentary rock. It is mainly composed of the remains of diatoms. The pore size of diatom minerals is micron-sized and there are many pores. The surface of its particles has countless tiny holes, which are regularly and neatly arranged in circles and needles. The number of micropores per unit area is thousands of times more than that of charcoal, locking more still air, reducing air convection and thermal conductivity, and at the same time having extremely strong physical adsorption and ion exchange properties and is widely used in the fields of building materials and home decoration. However, there are relatively few cases of applying diatom mud to the field of textile fabrics, especially in the field of warm clothing fabrics. How to improve the bonding strength and durability of diatom mud, a complex inorganic component, with fabrics still requires more technical innovation and optimization. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide an antibacterial and thermal insulation fabric based on diatom mud coating.

[0004] Another object of the present invention is to provide a method for preparing an antibacterial thermal insulation fabric based on diatom mud coating.

[0005] Technical solution: The present invention discloses an antibacterial and warm-keeping fabric based on diatom mud coating, wherein the fabric is made by uniformly printing the diatom mud coating on a fabric substrate through a roller printing technology; the diatom mud coating is made by adding a binder, a dispersant, a defoamer and water to a coating powder and stirring; Taking the total mass as 100%, the coating powder comprises the following components: Powder A: diatomaceous earth 50%-70%, kaolin 3-8%, attapulgite 4-7%, calcium carbonate 4%-8%; Powder B: nano magnesium oxide 5%-10%, hollow glass microspheres 3-5%, nano titanium dioxide 2-5%, nano zinc oxide 1-3%.

[0006] Furthermore, the powder A also contains 1-5% bentonite.

[0007] Furthermore, the particle size of the coating powder is above 500 mesh.

[0008] The present invention provides a method for preparing an antibacterial thermal insulation fabric based on diatom mud coating, comprising the following steps: S1, subjecting powder B to silane coupling agent sensitization treatment to obtain powder B'; S2, mix powder A and powder B' evenly, add binder, dispersant, defoamer and water and continue stirring for 0.5-1h to prepare diatom mud coating; S3. Pretreatment of fabric substrate: including base fabric pretreatment, shaping and drying, and base fabric flatness treatment; S4, roller printing processing: adding the hot silver film and the diatom mud paint obtained in step S2 evenly into the material tank of the roller printing machine, and roller printing is performed to obtain a preliminary diatom mud paint printed fabric; S5. Wash and dry the preliminary diatom mud paint printed fabric prepared in S4 to finally produce the antibacterial and warm fabric based on diatom mud paint.

[0009] Furthermore, the specific steps of step S1 are: dissolving the vinyl silane coupling agent in water and stirring evenly, adding acetic acid solution to adjust the pH value of the solution to 5-6, adding powder B and stirring sufficiently, draining the excess water on the upper layer after natural precipitation, and vacuum drying to obtain powder B' sensitized by the vinyl silane coupling agent.

[0010] Furthermore, in step S2, the amount of the binder added is 10-30% of the weight of the coating powder, the amount of the dispersant added is 1-2% of the weight of the coating powder, the amount of the defoamer added is 1-2% of the weight of the coating powder, and the amount of water added is 2-4 times the weight of the coating powder; the binder is polyacrylic resin and the dispersant is sodium hexametaphosphate.

[0011] Furthermore, the specific steps of the base fabric pretreatment in step S3 are: washing the base fabric to be roll-coated twice in water with a degreasing and refining agent added thereto, and then washing it once with clean water, wherein the amount of the degreasing and refining agent added is 2-3% of the amount of water, and the washing temperature is 50-60°C.

[0012] Furthermore, the specific steps of shaping and drying in step S3 are: the base fabric is shaped with clean water, the shaping temperature is 145-150° C., the vehicle speed is 30-40 m / min, and the fabric surface is ensured to be fully dried.

[0013] Furthermore, the specific steps of the base fabric flatness treatment in step S3 are: cold rolling the base fabric, with the roller temperature controlled at 40-60° C. and the vehicle speed at 30-40 m / min.

[0014] Furthermore, the speed of the roller printing in step S4 is 15 m / min, and the printed fabric after roller coating is simultaneously baked in an oven.

[0015] Furthermore, during the water washing in step S5, 1-2% of antistatic agent, 1-2% of cross-linking agent and 2-3% of smoothing agent are added, and the water washing temperature is 80-90°C.

[0016] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: 1. Thermal insulation performance: The addition of modified diatom mud coating improves the thermal insulation and moisture absorption properties of the fabric, and can maintain the stability of the internal microenvironment of the fabric, thereby improving human comfort.

[0017] 2. Environmental protection and antibacterial: As a natural environmentally friendly material, diatom mud reduces chemical treatment of fabrics and reduces environmental pollution. At the same time, the fabric itself has good biodegradability. The addition of nano zinc oxide in the coating not only further improves the antibacterial properties of the coating, but also enhances the stability and durability of the coating. The antibacterial rates of the three major bacterial species of fabrics printed with diatom mud are all above 90%.

[0018] 3. Durability: Part of the powder in the diatom mud paint has been sensitized with a silane coupling agent, which makes it easier to graft it onto the fabric surface in the form of more covalent bonds during the subsequent roller printing of the fabric, thereby increasing the bonding strength between the paint and the fiber during printing. The diatom mud printed warm and antibacterial fabric produced through optimized technology has excellent wear resistance and can meet the fastness requirements of daily wear and use. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention. Example 1

[0020] Step 1 Preparation of diatom mud coating Step 1. The main components of diatomaceous earth include 62% diatomaceous earth, 8% nano magnesium oxide, 4% hollow glass beads, 6% kaolin, 6% attapulgite, 6% calcium carbonate, 2% nano zinc oxide, 4% nano titanium dioxide, and 2% bentonite. (The above powders are required to be ground and sieved separately, and the particle size must be controlled above 500 mesh). Weigh the above raw materials according to the designed specific gravity and set aside.

[0021] Step 2: sensitize part of the powder (nano magnesium oxide, hollow glass microspheres, nano titanium dioxide and nano zinc oxide) with a silane coupling agent. Weigh 7% of the weight of this part of the powder and dissolve it in water 3 times the weight of the powder and stir evenly. Add acetic acid solution to adjust the pH value of the solution to 5-6; then add the nano magnesium oxide, hollow glass microspheres, nano titanium dioxide and nano zinc oxide in the above materials into the mixing barrel. Stir thoroughly for 1.5 hours, drain the excess water on the upper layer after natural precipitation for 12 hours, and vacuum dry at 150°C to obtain diatom mud powder sensitized by a vinyl silane coupling agent.

[0022] Step 3, add the corresponding portions of diatomaceous earth, kaolin, attapulgite, bentonite and calcium carbonate weighed in advance to the part of the diatom mud powder sensitized by the silane coupling agent obtained in the above step, and then add 3 times the weight of water, 15% by weight of polyacrylic acid resin, 1% by weight of dispersant (sodium hexametaphosphate) and 1% by weight of defoaming agent (YL-801), and continue stirring for 1 hour to obtain a diatom mud coating that can be used for paint printing processing.

[0023] Step 2 Preparation of diatom mud paint printing fabric For the convenience of comparative testing, the base fabric of this scheme uses 75D polyester DTY filament as the warp yarn and 150D polyester DTY filament as the weft yarn, which is a woven fabric woven with plain weave. Step 1: pre-treatment of the base fabric. Wash the base fabric to be roller-coated twice in water with degreasing scouring agent added, and then wash it again with clean water. The amount of degreasing scouring agent added is 3%, and the washing temperature is 50-60℃.

[0024] Step 2: Setting and drying: the base fabric is set with clean water at a setting temperature of 145°C and a speed of 30m / min, making sure the fabric surface is fully dry.

[0025] Step 3: Flatness treatment of the base fabric: The base fabric is cold rolled, the roller temperature is controlled at 40-60°C, and the speed is 40m / min.

[0026] Step 4, roller printing processing. The hot silver film and the diatom mud coating prepared in step 1 are evenly added to the roller printing machine feed slot. The roller printing speed is 15m / min. The printed fabric after roller coating is simultaneously baked in an oven. The oven temperature from the first to the third section is 110°C, and the oven temperature from the fourth to the sixth section is 150°C. The preliminary diatom mud coating printed fabric is obtained.

[0027] Step 5, washing and drying the printed fabric to finally obtain the finished antibacterial warm-keeping fabric printed with diatom mud coating, wherein 1.5% antistatic agent, 1.5% cross-linking agent and 2% smoothing agent are added in the washing, the washing temperature is 85°C, and the vehicle speed is 25m / min. Example 2

[0028] Step 1 Preparation of diatom mud coating Step 1. The main components of diatom mud include 55% diatomaceous earth, 8% nano-magnesium oxide, 5% hollow glass beads, 8% kaolin, 8% attapulgite, 8% calcium carbonate, 3% nano-zinc oxide, and 5% nano-titanium dioxide (the above powders are required to be ground and sieved separately, and the particle size must be controlled above 500 mesh). Weigh the above raw materials according to the designed specific gravity and set aside.

[0029] Step 2: sensitize part of the powder (nano magnesium oxide, hollow glass microspheres, nano titanium dioxide and nano zinc oxide) with a silane coupling agent. Weigh 7% of the weight of this part of the powder and dissolve it in water 3 times the weight of the powder and stir evenly. Add acetic acid solution to adjust the pH value of the solution to 5-6; then add the nano magnesium oxide, hollow glass microspheres, nano titanium dioxide and nano zinc oxide in the above materials into the mixing barrel. Stir thoroughly for 1 hour, drain the excess water on the upper layer after natural precipitation for 12 hours, and vacuum dry at 175°C to obtain diatom mud powder sensitized by a vinyl silane coupling agent.

[0030] Step 3, add the corresponding portions of diatomaceous earth, kaolin, attapulgite and calcium carbonate weighed in advance to the part of the diatom mud powder sensitized by the silane coupling agent obtained in the above step, and then add 3 times the weight of water, 25% by weight of polyacrylic acid resin, 1% by weight of dispersant (sodium hexametaphosphate) and 1% by weight of defoaming agent (YL-801), and continue stirring for 0.5-1h to obtain a diatom mud coating that can be used for paint printing processing.

[0031] Step 2 Preparation of diatom mud coating printed fabric Step 1: pre-treatment of the base fabric: wash the base fabric to be roller coated twice in water with degreasing and refining agent added, and then wash it once with clean water. The amount of degreasing and refining agent added is 3%, and the washing temperature is 50-60℃.

[0032] Step 2: Setting and drying: the base fabric is set with clean water at a setting temperature of 150°C and a speed of 40m / min, making sure the fabric surface is fully dry.

[0033] Step 3: Flatness treatment of the base fabric: The base fabric is cold rolled, the roller temperature is controlled at 40-60°C, and the speed is 50m / min.

[0034] Step 4, roller printing processing. The hot silver film and the diatom mud coating prepared in step 1 are evenly added to the roller printing machine feed slot. The roller printing speed is 20m / min. The printed fabric after roller coating is simultaneously baked in an oven. The oven temperature from the first to the third section is 110°C, and the oven temperature from the fourth to the sixth section is 155°C. The preliminary diatom mud coating printed fabric is obtained.

[0035] Step 5, washing and drying the printed fabric to finally obtain the finished product of antibacterial and warm-keeping fabric printed with diatom mud coating. The washing process mainly includes adding 2% antistatic agent, 1% cross-linking agent and 2% smoothing agent, the washing temperature is 95°C, and the vehicle speed is 25m / min. Example 3

[0036] Step 1 Preparation of diatom mud coating Step 1. The main components of diatom mud include 68% diatomaceous earth, 8% nano magnesium oxide, 3% hollow glass beads, 5% kaolin, 6% attapulgite, 6% calcium carbonate, 2% nano zinc oxide, and 2% nano titanium dioxide (the above powders are required to be ground and sieved separately, and the particle size must be controlled above 500 mesh). Weigh the above raw materials according to the designed specific gravity and set aside.

[0037] Step 2: sensitize part of the powder (nano magnesium oxide, hollow glass microspheres, nano titanium dioxide and nano zinc oxide) with a silane coupling agent. Weigh 7% of the weight of this part of the powder and dissolve it in water 3 times the weight of the powder and stir evenly. Add acetic acid solution to adjust the pH value of the solution to 5-6; then add the nano magnesium oxide, hollow glass microspheres, nano titanium dioxide and nano zinc oxide in the above materials into the mixing barrel. Stir thoroughly for 0.5h, drain the excess water on the upper layer after natural precipitation for 12 hours, and vacuum dry at 130℃ to obtain diatom mud powder sensitized by a vinyl silane coupling agent.

[0038] Step 3, add the corresponding portions of diatomaceous earth, kaolin, attapulgite and calcium carbonate weighed in advance to the part of the diatom mud powder sensitized by the silane coupling agent obtained in the above step, and then add 3 times the weight of water, 10% by weight of polyacrylic acid resin, 1% by weight of dispersant (sodium hexametaphosphate) and 1% by weight of defoaming agent (YL-801), and continue stirring for 0.5h to obtain a diatom mud coating that can be used for paint printing processing.

[0039] Step 2 Preparation of diatom mud paint printing fabric Step 1: pre-treatment of the base fabric: wash the base fabric to be roller coated twice in water with degreasing and refining agent added, and then wash it once with clean water. The amount of degreasing and refining agent added is 2%, and the washing temperature is 50-60℃.

[0040] Step 2: Setting and drying: the base fabric is set with clean water at a setting temperature of 150°C and a speed of 30m / min, making sure the fabric surface is fully dry.

[0041] Step 3: Flatness treatment of the base fabric: The base fabric is cold rolled, the roller temperature is controlled at 40-60°C, and the speed is 40m / min.

[0042] Step 4, roller printing processing. The hot silver film and the diatom mud coating prepared in step 1 are evenly added to the roller printing machine feed slot. The roller printing speed is 15m / min. The printed fabric after roller coating is simultaneously baked in an oven. The oven temperature from the first to the third section is 100°C, and the oven temperature from the fourth to the sixth section is 135°C. The preliminary diatom mud coating printed fabric is obtained.

[0043] Step 5, washing and drying the printed fabric to finally obtain the finished product of antibacterial and warm-keeping fabric printed with diatom mud coating. The washing process mainly includes adding 2% antistatic agent, 2% cross-linking agent and 3% smoothing agent, the washing temperature is 85°C, and the vehicle speed is 20m / min.

[0044] Comparative Example 1 Compared with Example 1, the main difference is that in the preparation process of diatom mud coating, the main component of the diatom mud coating powder does not include hollow glass beads, that is, the main components include 66% diatomaceous earth, 8% nano magnesium oxide, 6% kaolin, 6% attapulgite, 6% calcium carbonate, 2% nano zinc oxide, 4% nano titanium dioxide, and 2% bentonite (the above powders are required to be ground and sieved respectively, and the particle size must be controlled above 500 mesh), weigh the above raw materials according to the designed specific gravity and set aside.

[0045] The rest of the process is the same as in Example 1.

[0046] Comparative Example 2 Compared with Example 1, the main difference is that in the preparation process of diatom mud coating, the main component of diatom mud coating powder does not include nano zinc oxide, that is, the main component of diatom mud includes 64% diatomite, 8% nano magnesium oxide, 4% hollow glass microspheres, 6% kaolin, 6% attapulgite, 6% calcium carbonate, 4% nano titanium dioxide, and 2% bentonite (the above powders are required to be ground and sieved respectively, and the particle size must be controlled at more than 500 meshes), and the above raw materials are weighed according to the designed specific gravity for standby use. The rest of the process is the same as Example 1.

[0047] Comparative Example 3 Compared with Example 1, the main difference is that in the preparation process of the diatom mud coating, part of the powder is not subjected to silane coupling agent sensitization treatment. That is, the nano magnesium oxide, hollow glass microspheres, nano titanium dioxide and nano zinc oxide are not pretreated by the vinyl silane coupling agent (KH-570). The rest of the process is the same as Example 1.

[0048] Comparative Example 4 Compared with Example 1, the main difference is that the base fabric is not pretreated during the preparation of the diatom mud paint printing fabric, that is, the base fabric to be roll-coated is not pre-washed, dried, or flattened, and the diatom mud paint printing process is directly performed. The rest of the process is the same as in Example 1.

[0049] The test results and data are shown in Table 1: Table 1

[0050] Clo is a unit used to measure the thermal insulation performance of clothing or textiles. It represents the thermal resistance that a certain clothing or fabric combination can provide under still air conditions.

[0051] It can be seen from Table 1 that the fabrics prepared in Examples 1-3 of the present invention have excellent thermal insulation performance and durability, and at the same time have good environmental protection and antibacterial ability. The antibacterial rates of the three major bacteria are all above 80%, among which the antibacterial effects on Staphylococcus aureus and Escherichia coli are particularly good, both reaching more than 90%.

[0052] The difference of Comparative Example 1 is that the coating powder does not contain hollow glass microbeads, and it can be seen that the thermal insulation performance of the prepared fabric is reduced; the difference of Comparative Example 2 is that the coating powder does not contain nano zinc oxide, and it can be seen that the antibacterial rate of the prepared fabric against Staphylococcus aureus, Escherichia coli, and Candida albicans is significantly reduced, and the antibacterial effect of the present invention cannot be achieved; the difference of Comparative Example 3 is that part of the powder is not sensitized with a silane coupling agent during the preparation of the diatom mud coating, and the difference of Comparative Example 4 is that the base fabric is not pretreated during the preparation of the diatom mud coating printed fabric. It can be seen that the wear times of the fabrics prepared in Comparative Examples 3 and 4 are significantly reduced, especially the fabric prepared in Comparative Example 3. Therefore, the process of sensitizing part of the powder with a silane coupling agent is crucial, which can greatly improve the durability of the fabric.

Claims

1. An antibacterial and warm-keeping fabric based on diatom mud coating, characterized in that: The fabric is made by uniformly printing the diatom mud coating on the fabric substrate by means of a roller printing technique; the diatom mud coating is made by adding a binder, a dispersant, a defoamer and water to the coating powder and stirring; Taking the total mass as 100%, the coating powder comprises the following components: Powder A: diatomaceous earth 50%-70%, kaolin 3-8%, attapulgite 4-7%, calcium carbonate 4%-8%; Powder B: nano magnesium oxide 5%-10%, hollow glass microspheres 3-5%, nano titanium dioxide 2-5%, nano zinc oxide 1-3%.

2. The antibacterial thermal insulation fabric based on diatom mud coating according to claim 1 is characterized in that: The powder A also contains 1-5% bentonite.

3. The antibacterial thermal insulation fabric based on diatom mud coating according to claim 1 is characterized in that: The particle size of the coating powder is above 500 meshes.

4. The method for preparing the antibacterial thermal insulation fabric based on diatom mud coating according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, subjecting powder B to silane coupling agent sensitization treatment to obtain powder B'; S2, mix powder A and powder B' evenly, add binder, dispersant, defoamer and water and continue stirring for 0.5-1h to prepare diatom mud coating; S3. Pretreatment of fabric substrate: including base fabric pretreatment, shaping and drying, and base fabric flatness treatment; S4, roller printing processing: adding the hot silver film and the diatom mud paint obtained in step S2 evenly into the material tank of the roller printing machine, and roller printing is performed to obtain a preliminary diatom mud paint printed fabric; S5. Wash and dry the preliminary diatom mud paint printed fabric prepared in S4 to finally produce the antibacterial and warm fabric based on diatom mud paint.

5. The preparation method according to claim 4, characterized in that: The specific steps of step S1 are: dissolving the vinyl silane coupling agent in water and stirring evenly, adding acetic acid solution to adjust the pH value of the solution to 5-6, adding powder B and stirring sufficiently, draining the excess water on the upper layer after natural precipitation, and vacuum drying to obtain powder B' sensitized by the vinyl silane coupling agent.

6. The preparation method according to claim 4, characterized in that: In the step S2, the amount of the binder added is 10-30% of the weight of the coating powder, the amount of the dispersant added is 1-2% of the weight of the coating powder, the amount of the defoamer added is 1-2% of the weight of the coating powder, and the amount of water added is 2-4 times the weight of the coating powder; the binder is polyacrylic resin, and the dispersant is sodium hexametaphosphate.

7. The preparation method according to claim 4, characterized in that: The specific steps of the base fabric pretreatment in step S3 are: washing the base fabric to be roll-coated twice in water with a degreasing and refining agent added thereto, and then washing it once with clean water, wherein the amount of the degreasing and refining agent added is 2-3% of the amount of water, and the washing temperature is 50-60°C.

8. The preparation method according to claim 4, characterized in that: The specific steps of shaping and drying in step S3 are: the base fabric is shaped with clean water, the shaping temperature is 145-150° C., the vehicle speed is 30-40 m / min, and the fabric surface is ensured to be fully dried.

9. The preparation method according to claim 4, characterized in that: The specific steps of the base fabric flatness treatment in step S3 are: cold rolling the base fabric, with the roller temperature controlled at 40-60° C. and the rolling speed at 30-40 m / min.

10. The preparation method according to claim 4, characterized in that: The speed of the roller printing in step S4 is 15 m / min, and the printed fabric after roller coating is simultaneously baked in an oven.

11. The preparation method according to claim 4, characterized in that: During the water washing in step S5, 1-2% of antistatic agent, 1-2% of cross-linking agent and 2-3% of smoothing agent are added to the water, and the water washing temperature is 80-90°C.

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