A natural fiber woven environmentally friendly sunshade fabric and its production process

Abstract

The present invention relates to the technical field of sunshade fabrics, and in particular to a natural fiber woven environment-friendly sunshade fabric. The fabric comprises a woven layer woven from warp yarns and weft yarns, a transparent coating layer having a flame retardant function is coated on at least one surface of the woven layer, the woven layer is a plain weave structure of a three-dimensional structure consisting of warp yarns and weft yarns interwoven with the warp yarns, the warp yarns are low-melting yarns, the weft yarns include low-melting yarns, and hemp fiber yarns alternately woven with the low-melting yarns at a ratio of 1:1; the fineness of the low-melting yarns is 40-80D, the line diameter of the hemp fiber yarns is 0.18-0.65mm; the density of the weft yarns is 45-86 strands / inch, and the fabric weight is 140-182g / m 2 , with a thickness of 0.38-0.56 mm. The invention also includes a production process of a natural fiber woven environment-friendly sunshade fabric. The preparation method of the invention is simple and the production cost is low. The sunshade fabric not only has good anti-ultraviolet and antibacterial properties, but also belongs to an environment-friendly fabric, is environmentally friendly, has a smooth and soft hand feel, and has a three-dimensional aesthetic feeling, and is worthy of being widely promoted and applied.

Description

Technical Field

[0001] The invention relates to the technical field of sunshade fabrics, and in particular to a natural fiber woven environment-friendly sunshade fabric and a production process thereof. Background Art

[0002] With the improvement of people's environmental awareness and the pursuit of low-carbon life, sunshade fabrics are increasingly widely used in office buildings, hotel offices, factories, conference rooms, multimedia rooms, lecture halls, laboratories, X-ray rooms, photo processing rooms and theaters and other indoor places with strict sunshade requirements. Sunshade fabrics, as the name suggests, refer to fabrics used to block the sun's strong light and harmful light. It has some functions that other fabrics do not have, such as regulating indoor temperature, regulating natural light, and transmitting scenery. It can effectively block ultraviolet rays and facilitate the generation of yellow light.

[0003] Existing sunshade fabrics are all made of PVC coated polyester fibers, and are made of polymer composite materials with the function of blocking sunlight. Sunshade fabrics produced using polymer composite materials have the following disadvantages: First, in order to make the sunshade fabric have anti-ultraviolet and antibacterial properties, it is necessary to coat the sunshade fabric or the fibers woven into the sunshade fabric with coatings that can absorb or reflect ultraviolet rays, as well as antibacterial agents, which not only makes the production process complicated, but also has poor fabric degradation ability and is not environmentally friendly. Second, since the coating layer of the polyester fiber is soft PVC, the addition of plasticizers significantly reduces its limiting oxygen index, reduces its flame retardant efficiency, and releases smoke and harmful gases when burned. The flame retardant currently used in soft PVC is mainly antimony trioxide. Although it has excellent flame retardant effect, it also has the disadvantages of being unfriendly to the environment and having a small smoke suppression effect.

[0004] Hemp fiber, on the one hand, this natural fiber contains phenolic substances, which can significantly kill and inhibit a variety of bacteria. In addition, hemp fiber is distributed with dense gaps and small holes, which can absorb a large amount of oxygen in the air, making it impossible for anaerobic bacteria to survive, achieving the purpose of sterilization and inhibition. On the other hand, the cross-section of hemp fiber is irregular triangle, polygon, waist circle, etc., and the middle cavity is linear or elliptical, which is often different from the appearance. From the molecular structure analysis of hemp fiber, its molecular structure has spiral lines, multi-faceted, and loose. After the light wave is emitted, diffuse reflection and multi-layer light refraction are formed in the crystallization area of ​​​​hemp fiber. In the amorphous area, gaps and holes of the fiber molecules, the light wave is destroyed and absorbed, so that hemp fabric has good anti-ultraviolet radiation function.

[0005] At present, there are few reports on the application of hemp fiber in sunshade fabrics. In order to reduce the environmental burden of existing sunshade fabrics, it is urgent to study a sunshade fabric that has natural mildew and antibacterial properties, can absorb ultraviolet rays, is anti-static, has fast moisture absorption and release, has good drape, high flame retardant properties, and is soft and comfortable to the touch.

[0006] For example, patent CN 110042528 A discloses a sunshade fabric and a preparation method thereof. The sunshade fabric includes: fiber lines forming a double-warp and double-weft structure, the structure includes rectangular or square gaps, and the fiber lines are made of halogen-free polyolefin composite materials. The halogen-free polyolefin composite materials, measured by weight, include: 50-70 parts of linear low-density polyethylene, 15-20 parts of ethylene-vinyl acetate copolymer, 20-30 parts of halogen-free flame retardant, 3-5 parts of expandable graphite, 1-5 parts of flame retardant synergist, 10-20 parts of flow modifier, 1-3 parts of polyvinylidene fluoride, 1-3 parts of nano titanium dioxide, 3-8 parts of compatibilizer, and 2-5 parts of other additives. The sunshade fabric has high flame retardancy and self-cleaning functions.

[0007] Another example is patent CN 110735214 A, which discloses a zero-opening, light-proof polymer composite sunshade fabric and its preparation process, which includes warp yarn and weft yarn for weaving to form a tight and void-free structure fabric, the warp yarn includes a warp core and a warp elastic coating layer coated on the outside of the warp core, the weft yarn includes a weft core and a weft elastic coating layer coated on the outside of the weft core, the density of the weft yarn is 16-23 yarns / cm, the warp elastic coating layer and the weft elastic coating layer both include polyvinyl chloride resin powder with a polymerization degree of 1000-1100, matte polyvinyl chloride resin powder, ultraviolet absorber, toner, and the balance is auxiliary agent, which has better toughness, makes the warp yarn and weft yarn tighter during the weaving process to form a zero-opening structure, and is not easy to deform after long-term use. When damaged by external force, the warp yarn and the weft yarn are still tight, have extremely high structural stability and light-proof function, are durable, and do not have the various defects of coating, and have broad application prospects.

[0008] Although the above patents all have the functions of anti-ultraviolet and antibacterial, the functions of anti-ultraviolet and antibacterial are obtained by adding ultraviolet absorbers and antibacterial agents, which not only makes the production process of sunshade fabrics cumbersome and high in preparation cost, but also is not environmentally friendly. Summary of the invention

[0009] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a natural fiber woven environmentally friendly sunshade fabric and its production process which has natural anti-ultraviolet and antibacterial capabilities, high anti-ultraviolet and antibacterial capabilities, is environmentally friendly, has a simple production process, and has low preparation cost.

[0010] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a natural fiber woven environmentally friendly sunshade fabric, the fabric includes a woven layer woven by warp yarns and weft yarns, a transparent coating layer with flame retardant function is coated on at least one surface of the woven layer, the woven layer is a plain weave structure with a three-dimensional structure composed of warp yarns and weft yarns interwoven with the warp yarns, the warp yarns are low-melt yarns, the weft yarns include low-melt yarns, and hemp fiber yarns alternately woven with the low-melt yarns in a 1:1 ratio; the fineness of the low-melt yarns is 40-80D, and the wire diameter of the hemp fiber yarns is 0.18-0.65mm; the density of the weft yarns is 45-86 strands / inch, and the gram weight of the fabric is 140-182g / m 2 , thickness is 0.38-0.56mm.

[0011] The above-mentioned natural fiber woven environment-friendly sunshade fabric, the coating of the coating layer is prepared from the following components in percentage by weight:

[0012] Acrylic emulsion with a concentration of 44-46% by mass: 5.21-10.53%;

[0013] Acrylic emulsion with a concentration of 49-51% by mass 15.33-31.28%;

[0014] Flame retardant 40.61-73.94%;

[0015] Wetting agent 3.29-5.36%;

[0016] Defoaming agent 0.11-0.63%;

[0017] Thickener 0.74-3.65%;

[0018] Ammonia 0.23-4.89%;

[0019] Water balance.

[0020] The above-mentioned natural fiber woven environmentally friendly sunshade fabric, the preparation method of the coating is firstly adding acrylic emulsion with a concentration mass percentage of 44-46%, acrylic emulsion with a concentration mass percentage of 49-51%, flame retardant, wetting agent, defoaming agent, water with a weight percentage of 0.08-0.77%, thickener, water with a weight percentage of 0.93-5.42%, and ammonia water into a high-speed disperser in sequence for dispersion and mixing. During the dispersion and mixing, each time a component is added, it is stirred for 3-15 minutes; then the dispersed and mixed mixture is moved to a mixer for stirring until the viscosity of the mixture reaches 6200-8500 and the pH value reaches 8.5-9.5, and finally encapsulated.

[0021] The above-mentioned natural fiber woven environment-friendly sunshade fabric, the defoaming agent is a mineral oil defoaming agent, and the flame retardant is a phosphorus-nitrogen flame retardant, which does not contain halogen and is environmentally friendly.

[0022] The natural fiber woven environment-friendly sunshade fabric mentioned above controls the speed of the high-speed disperser to be 200-500 r / min.

[0023] The above-mentioned natural fiber woven environment-friendly sunshade fabric has a warp yarn density of 80-155 yarns / inch and an opening rate of 1-12%.

[0024] The above-mentioned natural fiber woven environmentally friendly sunshade fabric, the low-melting yarn includes COPET and polyamide (PA), and the hemp fiber yarn includes hemp yarn and flax yarn.

[0025] A production process of an environmentally friendly sunshade fabric woven from natural fibers, comprising the following steps:

[0026] S1. Warping, using low-melting silk as the warp yarn, first through the sectional warping machine to arrange into a weaving beam for standby use;

[0027] S2. Reeding, reeding the warped weaving beam in step S1 on the reeding device;

[0028] S3 weaving, weft yarn using low-melt silk and hemp fiber yarn according to a 1:1 ratio of alternating weaving on the loom, to obtain a woven fabric, spare;

[0029] S4. Heat setting, using a high temperature setting machine to heat set the woven fabric obtained in step S3, wherein the speed of the high temperature setting machine is controlled to be 15-25m / min, the temperature is heated by a four-section oven, and the temperature is controlled to be 80℃-160℃;

[0030] S5. Coating: coating the woven fabric obtained in step S4 with a coating machine, controlling the speed of the coating machine to be 12-18 m / min, and heating with an eight-section oven at a temperature of 55-162°C.

[0031] In the above-mentioned production process of the natural fiber woven environment-friendly sunshade fabric, in step S1, the speed of the warping machine is controlled to be 135-160 m / min, and the tension is controlled to be 15-20N.

[0032] In the production process of the above-mentioned natural fiber woven environmentally friendly sunshade fabric, in step S3, the density of the weft is 65 threads / inch; in step S4, the temperatures of the four ovens are respectively controlled to: 80-90℃, 100-120℃, 130-150℃, and 150-160℃.

[0033] The production process of the above-mentioned natural fiber woven environmentally friendly sunshade fabric, when using an eight-section oven for drying, the temperatures of the eight-section oven are respectively controlled to: 55-90℃, 82-100℃, 87-110℃, 105-125℃, 120-135℃, 110-152℃, 136-162℃, 85-125℃.

[0034] The beneficial effects of the natural fiber woven environment-friendly sunshade fabric and its production process of the present invention are as follows: first, the present invention innovatively uses hemp fiber yarn to prepare sunshade fabric, making full use of the high-quality characteristics of hemp fiber itself, such as anti-ultraviolet performance and antibacterial performance, to achieve natural anti-ultraviolet and antibacterial performance, avoiding the use of ultraviolet absorbers and antibacterial agents, being environmentally friendly, reducing costs, and having a smoother and softer feel. Secondly, the warp is low-melting yarn, and the weft yarn is arranged alternately with hemp yarn and low-melting yarn in a 1:1 ratio, and the line diameter of the hemp yarn is larger than the line diameter of the low-melting yarn. Due to the difference in line diameter, the sunshade fabric produced is a plain weave structure with a three-dimensional structure, which can increase the overall specific surface area of ​​the fabric, so the area of ​​the hemp yarn with absorbable anti-ultraviolet and antibacterial properties exposed to the sun is relatively large, which ultimately greatly improves the anti-ultraviolet and antibacterial capabilities, and has a better sunshade effect and a three-dimensional aesthetic. Third, the low-melt wire has a low melting point and melts first, so the low-melt wire can be bonded to the hemp yarn, and the intersections between the low-melt wires can be bonded, so that the opening position of the sunshade fabric can be fixed, which not only makes the pore uniformity on the fabric better, but also ensures the opening rate, and the overall light transmission and air permeability of the fabric are good. Fourth, the coating adopts a transparent, flame-retardant coating, and the three-dimensional effect on the sunshade fabric grey cloth can be seen through the coating, that is, the texture, three-dimensional sense, texture and color of the original sunshade fabric grey cloth are not changed, highlighting its natural beauty and three-dimensional beauty. It can also make the fabric have excellent environmental protection and flame retardant properties. The preparation method of the present invention is simple and the production cost is low. The sunshade fabric not only has good UV resistance and antibacterial properties, but also is an environmentally friendly fabric, environmentally friendly, smooth and soft to the touch, and is worthy of being widely promoted and applied. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the plain weave structure of the three-dimensional structure of Example 1;

[0036] Figure 2 It is a schematic diagram of the AA cross-sectional structure;

[0037] Figure 3 This is a schematic diagram of the sunshade fabric structure of Example 1. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments;

[0039] Example 1

[0040] like Figure 1 , 2 As shown in Figure 3, a natural fiber woven environmentally friendly sunshade fabric includes a woven layer 1 woven from warp yarns and weft yarns, and a transparent and flame-retardant coating layer 2 is coated on at least one surface of the woven layer 1. The woven layer 1 is a plain weave structure with a three-dimensional structure consisting of warp yarns 3 and weft yarns interwoven with the warp yarns 3. The warp yarns are low-melt yarns, and the weft yarns include low-melt yarns 4 and hemp fiber yarns 5 alternately woven with the low-melt yarns in a 1:1 ratio. In this embodiment, the low-melt yarns in the warp and weft yarns have the same fineness, both of which are 50D. The hemp fiber yarn is hemp yarn, and the line diameter of the hemp yarn is 0.32mm. The density of the weft yarn is set to 65 yarns / inch, and the density of the warp yarn is 100 yarns / inch. The final fabric weight is 152g / m 2 The thickness is 0.38-0.56 mm, and the opening rate of the fabric is controlled to be 5%. The low-melting wire in this embodiment is COPET.

[0041] In this embodiment, the coating of the coating layer is prepared from the following components in weight percentage: 7.8% acrylic emulsion with a concentration of 45% by mass; 23.12% acrylic emulsion with a concentration of 50% by mass; 58.21% flame retardant; 4.32% wetting agent; 0.36% defoamer; 2.2% thickener; 2.5% ammonia water; water balance. Among them, the acrylic emulsion with a concentration of 45% by mass and the acrylic emulsion with a concentration of 50% by mass are both environmentally friendly water-based acrylic copolymer emulsions, both of which have excellent bonding firmness and adhesion, good stiffness, fine foaming, good hand feel, high whiteness, not easy to turn yellow, and do not contain APEO, which is environmentally friendly. The appearance is a milky blue phase liquid, the solid content is 44-46%, and the pH value is 3.0-5.0. Wetting agent can improve the fluidity of coating slurry. It is a defoaming and dispersing wetting agent used to increase the permeability of transparent coating emulsion so that the transparent coating emulsion can better contact the base fabric. It is composed of alcohol ethoxylates, alkyl esters and other additives in water-based emulsions. The pH value is 7.0 at 20°C, the specific gravity is about 1.0 g / cm3, the viscosity is 4000-7000 mPa.s, the stability is good, and it can be mixed with most polymers. The defoamer is GMO-1 mineral oil defoamer, which is a defoamer synthesized from hydrophobic gas phase silica and metal soaps, and the pH value is 6-8. In the technical scheme of the present invention, the thickener is a mixture of 5-chloro-2-methyl-3(2H)isothiazolone and 2-methyl-3(2H)isothiazolone in a concentration range of ≥0.0002 to <0.0025, which has an adhesive effect and is used to increase the viscosity of the acrylic emulsion and the flame retardant, so that the acrylic emulsion and the flame retardant maintain a uniform and stable suspension state or an emulsion state, or form a gel. Enhance the mechanical strength of the transparent coating emulsion after coating. The flame retardant adopts a phosphorus nitrogen flame retardant, which has a better flame retardant effect and is more environmentally friendly than the traditional halogen-containing flame retardant. When the content of the thickener is less than 0.74% by weight, the thickener has poor adhesive ability and cannot maintain the acrylic emulsion and the flame retardant in a uniform and stable suspension state or an emulsion state, or form a gel. When the content of the wetting agent exceeds 3.65% by weight, the mechanical strength of the transparent coating emulsion may be enhanced due to excessively enhanced adhesiveness, and the excessively strong adhesive ability may cause the acrylic emulsion and the flame retardant to form a gel in advance.

[0042] In each composition of the coating layer of the present invention, an acrylic emulsion with a concentration of 45% by mass, an acrylic emulsion with a concentration of 50% by mass, a flame retardant, a wetting agent, a defoaming agent, a thickener, and ammonia water are mixed in a specific proportion, and each component is a transparent liquid, and the components are physically miscible with each other, without chemical reaction, and without affecting the transparency of the components. The mixed transparent coating emulsion is diluted with water to achieve the required viscosity requirement. Therefore, the present invention can provide a coating film with excellent physical properties such as transparency, adhesion, flame retardancy, and durability.

[0043] The preparation method of the coating is to first add 45% acrylic emulsion with a mass percentage, 50% acrylic emulsion with a mass percentage, flame retardant, wetting agent, defoamer, 0.42% water by weight, thickener, 1.07% water by weight, and ammonia water to a high-speed disperser in order for dispersion and mixing, and control the speed of the high-speed disperser to be 350r / min. During dispersion and mixing, each component is stirred for 9 minutes; then the mixture after dispersion and mixing is moved to a mixer for stirring until the viscosity of the mixture reaches 6200-8500 and the pH value reaches 8.5-9.5, and finally packaged. Among them, after adding the thickener, the speed of the mixer is appropriately increased. The coating prepared by the method of the present invention has high viscosity, strong adhesion, high bonding firmness with the grey cloth, long bonding time, good durability, not easy to turn yellow, and high flame retardant coefficient, which can reach 7-8 levels. Traditional sunshade fabric coatings are mostly improved by adding darker color powder to improve the anti-ultraviolet ability of sunshade fabrics. The present invention innovatively proposes for the first time to prepare a transparent coating, which is then coated on the woven layer and combined with the woven layer. This not only makes the sunshade fabric prepared by the present invention have anti-ultraviolet and antibacterial capabilities, but also the three-dimensional structure of the grey cloth can be seen through the transparent coating, thereby enhancing the three-dimensional sense of the sunshade fabric and highlighting its natural beauty and three-dimensional beauty.

[0044] A production process of an environmentally friendly sunshade fabric woven from natural fibers, comprising the following steps:

[0045] S1. Warping, using low-melting yarn as the warp yarn, first through the sectional warping machine to arrange into a weaving beam for standby; wherein the speed of the warping machine is controlled at 150m / min, and the tension is controlled at 15-20N;

[0046] S2 reeding, the warped weaving shaft in step S1 is reeded on the reeding device; wherein the specification of the reed is 165#, the number of heald frames is 4 pages;

[0047] S3. Weaving, the weft yarn is made of low-melt yarn and hemp fiber yarn in a 1:1 ratio and woven on the loom alternately to obtain a woven fabric for standby use; wherein the density of the weft yarn is controlled to be 65 roots / inch, and the hemp fiber yarn is made of hemp yarn;

[0048] S4. Heat setting, using a combined tentering high-temperature setting machine to heat set the woven fabric obtained in step S3, wherein the speed of the high-temperature setting machine is controlled to be 20m / min, the temperature is heated by four-section ovens, and the temperatures of the four-section ovens are respectively controlled to be: 80-90°C, 100-120°C, 130-150°C, 150-160°C; the circulating air is controlled to be 80r / min, and the exhaust air is 120r / min;

[0049] S5. Coating, coating the woven fabric obtained in step S4 using a coating machine, controlling the speed of the coating machine to 15m / min, and heating with an eight-section oven, the temperatures of the eight-section ovens are respectively controlled to: 55-90°C, 82-100°C, 87-110°C, 105-125°C, 120-135°C, 110-152°C, 136-162°C, 85-125°C.

[0050] By setting the fabric to a plain weave structure with a three-dimensional structure, not only the anti-ultraviolet and antibacterial capabilities are greatly improved, the sunshade effect is better, and it has a three-dimensional aesthetic. The coating layer uses a coating that not only has a flame retardant function, but also can achieve a transparent effect after coating, so that the prepared fabric has a good flame retardant effect and does not change the original color of the grey cloth. After the transparent coating is applied to the woven layer, the finished product produced is significantly improved overall compared to the existing technology, that is, the texture, three-dimensional sense, and texture of the sunshade fabric grey cloth itself can be more effectively highlighted, making the sunshade fabric grey cloth natural in color, and presenting the original effect of the grey cloth more perfectly to consumers. At the same time, the sunshade fabric using hemp fiber is more environmentally friendly than the traditional one, and has a good application prospect.

[0051] Example 2

[0052] The same as Example 1 is not repeated here. The difference is that in this example, the hemp fiber yarn is flax yarn; the fineness of the low-melting yarn is 70D, and the line diameter of the flax yarn is 0.5mm. The density of the warp yarn is 90 strands / inch, and the weight of the obtained fabric is 168g / m 2 The thickness is 0.38-0.56 mm, and the opening rate of the fabric is 3%. The low-melting wire in this embodiment is made of polyamide (PA).

[0053] In this embodiment, the coating of the coating layer is prepared from the following components in weight percentage: 6.32% acrylic emulsion with a concentration of 45% by mass; 20.51% acrylic emulsion with a concentration of 50% by mass; 60.68% flame retardant; 3.81% wetting agent; 0.52% defoaming agent; 3.48% thickener; 2.79% ammonia water; and the remainder is water.

[0054] The coating preparation method is as follows: first, acrylic emulsion with a concentration of 45% by mass, acrylic emulsion with a concentration of 50% by mass, flame retardant, wetting agent, defoamer, water with a weight percentage of 0.38%, thickener, water with a weight percentage of 1.51%, and ammonia water are sequentially added to a high-speed disperser for dispersion and mixing, and the speed of the high-speed disperser is controlled to be 280r / min. During dispersion and mixing, each time a component is added, it is stirred for 12 minutes; then the dispersed and mixed mixture is moved to a stirrer for stirring until the viscosity of the mixture reaches 6200-8500 and the pH value reaches 8.5-9.5, and finally packaged.

[0055] In the production process of the natural fiber woven environment-friendly sunshade fabric in this embodiment, the speed of the warping machine is controlled to be 142 m / min during warping; during heat setting, the speed of the high-temperature setting machine is controlled to be 20 m / min.

[0056] Example 3

[0057] The same as Example 1 is not repeated here, except that the diameter of the hemp yarn in this example is 0.6 mm. The density of the weft yarn is set to 65 yarns / inch, and the density of the warp yarn is set to 110 yarns / inch. The final fabric weight is 165 g / m 2 , low-fuse wire uses polyamide (PA).

[0058] In this embodiment, the coating of the coating layer is prepared from the following components in weight percentage: 8.18% acrylic emulsion with a concentration of 45% by mass; 24.1% acrylic emulsion with a concentration of 50% by mass; 55.86% flame retardant; 3.38% wetting agent; 0.29% defoaming agent; 1.23% thickener; 3.56% ammonia water; and the remainder water.

[0059] The coating preparation method is as follows: first, acrylic emulsion with a concentration of 45% by mass, acrylic emulsion with a concentration of 50% by mass, flame retardant, wetting agent, defoamer, water with a weight percentage of 0.56%, thickener, water with a weight percentage of 2.84%, and ammonia water are sequentially added to a high-speed disperser for dispersion and mixing, and the speed of the high-speed disperser is controlled to be 280r / min. During dispersion and mixing, each component is stirred for 15 minutes; then, the dispersed and mixed mixture is moved to a stirrer for stirring until the viscosity of the mixture reaches 6200-8500 and the pH value reaches 8.5-9.5, and finally packaged.

[0060] In the production process of the natural fiber woven environment-friendly sunshade fabric in this embodiment, the speed of the warping machine is controlled to be 150m / min during warping; during heat setting, the speed of the high-temperature setting machine is controlled to be 20m / min.

[0061] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable ordinary technicians in the field to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made based on the essence of the content of the present invention should be included in the protection scope of the present invention.

Claims

1. A natural fiber woven environment-friendly sunshade fabric, the fabric comprising a woven layer woven from warp yarns and weft yarns, characterized in that: A transparent coating layer with flame retardant function is coated on at least one surface of the woven layer. The woven layer is a plain weave structure with a three-dimensional structure consisting of warp yarns and weft yarns interwoven with the warp yarns. The warp yarns are low-melting yarns, and the weft yarns include low-melting yarns and hemp fiber yarns alternately woven with the low-melting yarns in a 1:1 ratio; the fineness of the low-melting yarns is 40-80D, and the line diameter of the hemp fiber yarns is 0.18-0.65mm; the density of the weft yarns is 45-86 strands / inch, and the gram weight of the fabric is 140-182g / m 2 , with a thickness of 0.38-0.56 mm; the coating of the coating layer is prepared from the following components in weight percentage: Acrylic emulsion with a concentration of 44-46% by mass: 5.21-10.53%; Acrylic emulsion with a concentration of 49-51% by mass: 15.33-31.28%; Flame retardant 40.61-73.94%; Wetting agent 3.29-5.36%; Defoaming agent 0.11-0.63%; Thickener 0.74-3.65%; Ammonia 0.23-4.89%; Water balance.

2. The natural fiber woven environment-friendly sunshade fabric according to claim 1 is characterized by: The coating preparation method comprises the following steps: firstly, adding an acrylic emulsion with a concentration of 44-46% by mass, an acrylic emulsion with a concentration of 49-51% by mass, a flame retardant, a wetting agent, a defoaming agent, 0.08-0.77% by weight of water, a thickener, 0.93-5.42% by weight of water, and ammonia water to a high-speed disperser in sequence for dispersion and mixing; during dispersion and mixing, stirring is performed for 3-15 minutes each time a component is added; then, the dispersed and mixed mixture is transferred to a mixer for stirring until the viscosity of the mixture reaches 6200-8500 and the pH value reaches 8.5-9.5, and finally, packaging is performed.

3. The natural fiber woven environment-friendly sunshade fabric according to claim 2 is characterized by: The speed of the high-speed disperser is controlled to be 200-500 r / min.

4. The natural fiber woven environment-friendly sunshade fabric according to claim 1 is characterized by: The density of the warp yarn is 80-155 yarns / inch, and the porosity of the fabric is 1-12%.

5. The natural fiber woven environment-friendly sunshade fabric according to claim 1 is characterized by: The low-melting yarn includes COPET and polyamide (PA), and the hemp fiber yarn includes hemp yarn and flax yarn.

6. A production process of the natural fiber woven environment-friendly sunshade fabric according to any one of claims 1 to 5, characterized in that: The steps include: S1. Warping, using low-melting silk as the warp yarn, first through the sectional warping machine to arrange into a weaving beam for standby use; S2. Reeding, reeding the warped weaving beam in step S1 on the reeding device; S3 weaving, weft yarn using low-melt silk and hemp fiber yarn according to a 1:1 ratio of alternating weaving on the loom, to obtain a woven fabric, spare; S4. Heat setting, using a high temperature setting machine to heat set the woven fabric obtained in step S3, wherein the speed of the high temperature setting machine is controlled to be 15-25m / min, the temperature is heated by a four-section oven, and the temperature is controlled to be 80℃-160℃; S5. Coating: coating the woven fabric obtained in step S4 with a coating machine, controlling the speed of the coating machine to be 12-18 m / min, and heating with an eight-section oven at a temperature of 55-162°C.

7. The production process of the natural fiber woven environment-friendly sunshade fabric according to claim 6 is characterized by: In step S1, the speed of the warping machine is controlled to be 135-160 m / min, and the tension is controlled to be 15-20 N.

8. The production process of natural fiber woven environment-friendly sunshade fabric according to claim 6 is characterized by: In step S3, the density of the weft yarn is 65 yarns / inch; in step S4, the temperatures of the four ovens are respectively controlled to be: 80-90°C, 100-120°C, 130-150°C, and 150-160°C.

9. The production process of the natural fiber woven environment-friendly sunshade fabric according to claim 6 is characterized by: When an eight-section oven is used for drying, the temperatures of the eight-section oven are respectively controlled to be: 55-90°C, 82-100°C, 87-110°C, 105-125°C, 120-135°C, 110-152°C, 136-162°C, 85-125°C.

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