High-flame-retardant low-smoke-release weldable coated fabric and preparation method thereof

Abstract

The invention discloses a high-flame-retardant low-smoke-release weldable coated fabric and a preparation method thereof. The coated fabric is prepared from the following raw materials in parts by mass: 80-120 parts of polyvinyl chloride resin, 40-60 parts of a plasticizer, 10-30 parts of a flame-retardant plasticizer, 20-50 parts of a powder flame retardant, 5-20 parts of a smoke suppressant, 40-60 parts of a functional filler and 10-20 parts of a diluent. According to the high-flame-retardant low-smoke-release weldable coating cloth and the preparation method thereof, the problems that an existing flame-retardant coating cloth technology is low in apparent color whiteness, the light-transmitting color is slightly red, the flame-retardant efficiency is low and the smoke release amount is large can be solved, and the prepared flame-retardant coating cloth has weldability.

Description

Technical Field

[0001] The invention belongs to the technical field of coated cloth materials and relates to a coated cloth, in particular to a highly flame-retardant, low-smoke-releasing weldable coated cloth and a preparation method thereof. Background Art

[0002] In recent years, building fire accidents have occurred frequently. The General Administration of Quality Supervision, Inspection and Quarantine and the National Standardization Administration have issued GB 8624-2012 Classification Standard for Combustion Performance of Building Materials and Products, which is applicable to the classification and determination of the combustion performance of building materials, decorative materials and products used in construction projects. Coated fabric building materials are applicable to the combustion performance grades and classification criteria of flat building materials and products in GB 8624-2012, which can be divided into B1, B2 and B3 grades, and are tested and judged according to GB / T 20284 and GB / T 8626 standards. All countries have clear regulations on the flammability of building materials. The flame retardancy level of decoration materials in shopping malls in my country is generally required to reach GB 8624-2012B1 level or above, requiring the combustion growth rate index FIGRA0.4MJ≤250W / s in the GB / T 20284 standard; the lateral spread of the flame does not reach the edge of the long wing of the specimen; the total heat release THR600 in 600s is ≤15MJ; the ignition time in the GB / T 8626 test is 30s, and the flame tip height Fs within 60s is ≤150mm; there is no phenomenon of burning dripping materials igniting the filter paper within 60s; the smoke generation rate index SMOORA≤30m2 / s2; the total smoke generation TSP600 in the test for 600s is ≤50m2.

[0003] Coated fabric is made by applying the required polyurethane coating, polyvinyl chloride coating, etc. to the base fabric such as cotton, polyester, nylon, etc. through processes such as padding or coating. The base fabric mainly plays the role of supporting skeleton, and the functionalization of the coating gives the composite material a wealth of special properties, such as antibacterial, wrinkle-resistant, mildew-proof, high temperature resistance, flame retardant, wear resistance, and anti-aging. Polyvinyl chloride coated fabric is widely used in building materials and interior decoration. Compared with low-weight coated fabric, high-weight coated products have better texture, but conventional high-weight flame retardant products have low apparent whiteness and reddish light due to the large amount of powder flame retardant used, which affects the use; and high-content flame retardant filling will cause the coated fabric product to lose weldability; at the same time, ordinary polyvinyl chloride coated fabric generates a lot of heat and smoke when burning, and it is difficult to pass the GB 8624-2012B1 (B-s2, d0) flame retardant grade, which is easy to cause casualties and property losses when a fire occurs. The market prefers coated fabric products with high gram weight, high apparent whiteness, bluish light transmittance, flame retardancy and smoke suppression rating of GB 8624-2012B1 (B-s2 / s1,d0), and which can be processed by welding.

[0004] At present, there have been some reports on the flame retardant research of polyvinyl chloride coated cloth, and some polyvinyl chloride flame retardant coated cloth materials have been developed. Chinese invention patent CN115538182A discloses a coating composite material and its preparation method and application. The invention discloses a preparation method of a compound flame retardant PVC coating composite material, the composite material includes the following components: PVC paste resin, liquid calcium zinc composite stabilizer, plasticizer, flame retardant plasticizer, flame retardant, compatibility modifier, binder, crosslinking agent, crosslinking aid, viscosity reducer. The preparation process of the invented product is: weigh the raw materials of the flame retardant PVC coating to make a paste slurry, then apply the flame retardant PVC coating paste slurry on both sides of the substrate layer, and dry to form a PVC coating film material.

[0005] For another example, Chinese invention patent CN105086197B discloses an antimony oxide compounded flame-retardant PVC soft composite material and its preparation method. The invention discloses an antimony oxide compounded flame-retardant PVC soft composite material and its preparation method. The composite material includes the following raw materials: PVC (SG-3), plasticizer, antimony trioxide, ammonium molybdate, montmorillonite, calcium zinc stabilizer, EVA, epoxy soybean oil, coupling agent, dispersant. The preparation process of the product of this invention is: after antimony trioxide is modified, it is mixed with raw materials such as ammonium molybdate, montmorillonite, EVA, etc., and the mixed powder is sieved with a vibrating centrifugal sieving machine, and the sieved powder is dried and then packaged for waterproofing. This invention can be used as a direct additive raw material for PVC products, and can also be added as a modification aid. It can also be used as a soft fireproof material such as PVC leather and protective decoration materials.

[0006] Chinese invention patent CN115353693A discloses a flame-retardant PVC film and a method for preparing the same. The invention discloses a flame-retardant PVC film and a method for preparing the same. The composite material includes the following raw materials: PVC resin powder, plasticizer, heat stabilizer, lubricant, tin dioxide, calcium borate, flame-retardant resin and color powder.

[0007] However, the flame retardant coated cloth prepared according to the prior art still has the problems of low apparent whiteness, reddish light transmission color, low flame retardant efficiency and large smoke release.

[0008] In view of this, there is an urgent need to design a new coated cloth to overcome at least some of the above-mentioned defects of the existing coated cloth. Summary of the invention

[0009] The present invention provides a highly flame-retardant, low-smoke-releasing weldable coated cloth and a preparation method thereof, which can solve the problems of low apparent color whiteness, reddish light transmittance, low flame retardant efficiency and large smoke release in the existing flame-retardant coated cloth technology, and make the prepared flame-retardant coated cloth weldable.

[0010] To solve the above technical problem, according to one aspect of the present invention, the following technical solution is adopted:

[0011] A highly flame-retardant, low-smoke-releasing weldable coated cloth, the coated cloth being prepared from the following raw materials in parts by mass: 80-120 parts of polyvinyl chloride resin, 40-60 parts of plasticizer, 10-30 parts of flame-retardant plasticizer, 20-50 parts of powdered flame retardant, 5-20 parts of smoke suppressant, 40-60 parts of functional filler and 10-20 parts of diluent.

[0012] As an embodiment of the present invention, the polyvinyl chloride resin is a resin powder for polyvinyl chloride paste.

[0013] As an embodiment of the present invention, the plasticizer includes at least one of dibutyl phthalate, diisononyl phthalate, dioctyl adipate, and dipropylheptyl phthalate.

[0014] As an embodiment of the present invention, the flame retardant plasticizer includes at least one of diphenyl isooctyl phosphate, tricresyl phosphate, diethylene glycol tetrakis(chloroisopropyl)bisphosphate, tris(1,3-dichloroisopropyl) phosphate, triisopropylphenyl phosphate, xylene monophenyl phosphate, and triphenyl phosphate.

[0015] As an embodiment of the present invention, the powder flame retardant includes a metal compound flame retardant; the metal compound flame retardant includes at least one of antimony trioxide, tin oxide, and zinc oxide;

[0016] The smoke suppressant includes a powder smoke suppressant, and the powder smoke suppressant includes at least one of ammonium octamolybdate, molybdenum trioxide, calcium molybdate, aluminum oxide, and aluminum hydroxide.

[0017] As an embodiment of the present invention, the functional filler includes at least one of a stabilizer and a whitening and reinforcing filler; the diluent is at least one of a D60 viscosity reducer, a D75 viscosity reducer, a D70 viscosity reducer, and a D80 viscosity reducer;

[0018] The stabilizer includes at least one of a calcium zinc stabilizer, a barium zinc stabilizer, and a tin stabilizer; the reinforcing and whitening filler includes at least one of calcium carbonate, kaolin, talcum powder, and titanium dioxide.

[0019] According to another aspect of the present invention, the following technical solution is adopted: a method for preparing a highly flame-retardant, low-smoke-releasing weldable coated cloth, the preparation method comprising:

[0020] Step S1: dispersing a set amount of flame retardant and smoke suppressant in a plasticizer, mixing them evenly with a stirrer, and preparing a paste-like flame retardant and smoke suppressant slurry with a grinding device;

[0021] Step S2: Mix and stir a set amount of polyvinyl chloride resin, plasticizer, paste-like flame retardant and smoke suppressant slurry, functional filler and diluent, and control the slurry temperature during the process to obtain a coating slurry;

[0022] Step S3: adding a flame retardant plasticizer to the coating slurry and mixing the mixture uniformly by stirring;

[0023] Step S4: using a viscosity reducer to adjust the viscosity of the coating slurry obtained in step S3 to meet the requirements of the machine;

[0024] Step S5: Use a coating device to evenly coat the coating slurry obtained in step S4 on the PET mesh cloth, perform a gelation reaction in a drying device, and then roll up to obtain a highly flame-retardant, low-smoke-releasing, weldable coated cloth.

[0025] As an embodiment of the present invention, in step S1, the speed of the stirrer is 1000-3000 r / min, and the stirring is stopped when the measured temperature reaches 40-50° C.; and the speed of the grinder in step S1 is 500-1000 r / min.

[0026] As an embodiment of the present invention, in step S2, the speed of the stirrer is 1000-2000 r / min, and the stirring is stopped when the measured temperature reaches 40-50° C.;

[0027] In step S3, the speed of the stirrer is 1000-2000 r / min, and stirring is stopped after stirring for 1-5 minutes.

[0028] As an embodiment of the present invention, the scraping speed in step S5 is 5-20 m / min; the drying equipment is an oven, and the oven temperature is 150-210°C.

[0029] The beneficial effects of the present invention are as follows: the highly flame-retardant, low-smoke-releasing weldable coated cloth and the preparation method thereof proposed in the present invention can solve the problems of low apparent color whiteness, reddish light transmittance, low flame retardant efficiency and large smoke release in the existing flame-retardant coated cloth technology, and make the prepared flame-retardant coated cloth weldable. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The figure is a flow chart of a method for preparing a coated cloth in one embodiment of the present invention. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0033] The description in this section is only for several typical embodiments, and the present invention is not limited to the scope of the embodiments. The same or similar prior art means and some technical features in the embodiments are mutually replaced within the scope of the present invention.

[0034] Unless otherwise indicated, implied from the context, or customary in the prior art, all parts and percentages in this application are based on weight, and the test and characterization methods used are all current as of the filing date of this application. Where applicable, the contents of any patent, patent application or publication referred to in this application are fully incorporated herein by reference, and their equivalent patent families are also incorporated by reference, especially the definitions of synthesis techniques, product and processing designs, polymers, comonomers, initiators or catalysts disclosed in these documents in the art. If the definition of a specific term disclosed in the prior art is inconsistent with any definition provided in this application, the definition of the term provided in this application shall prevail.

[0035] Numerical ranges in this application are approximate values, so unless otherwise specified, they may include numerical values ​​outside the range. Numerical ranges include all numerical values ​​from the lower limit to the upper limit increased by 1 unit, provided that there is an interval of at least 2 units between any lower value and any higher value. For example, if the recorded component, physical or other properties (such as molecular weight, melt index, etc.) are 100 to 1000, it means that all single values ​​are clearly listed, such as 100, 101, 102, etc., and all sub-ranges, such as 100 to 166, 155 to 170, 198 to 200, etc. For a range containing a numerical value less than 1 or containing a fraction greater than 1 (such as 1.1, 1.5, etc.), 1 unit is appropriately regarded as 0.0001, 0.001, 0.01 or 0.1. For a range containing a single digit less than 10 (such as 1 to 5), 1 unit is usually regarded as 0.1. These are only specific examples of what is intended to be expressed, and all possible combinations of values ​​between the lowest and highest values ​​listed are considered to be clearly recorded in this application. It should also be noted that the terms "first", "second", etc. in this article do not limit the order of precedence, but are only used to distinguish substances with different structures.

[0036] When used with respect to chemical compounds, unless expressly specified otherwise, the singular includes all isomeric forms and vice versa (e.g., "hexane" includes all isomers of hexane, individually or collectively). In addition, nouns using "a," "an," or "the" also include their plural forms unless expressly specified otherwise.

[0037] The terms "comprising", "including", "having" and their derivatives do not exclude the presence of any other components, steps or processes, and are irrelevant to whether these other components, steps or processes are disclosed in this application. To eliminate any doubt, unless explicitly stated, all compositions using the terms "comprising", "including", or "having" in this application may include any additional additives, adjuvants or compounds. On the contrary, except for those necessary for operating performance, the term "essentially consisting of..." excludes any other components, steps or processes from the scope of any description of the term below. The term "consisting of..." does not include any components, steps or processes that are not specifically described or listed. Unless explicitly stated, the term "or" refers to the listed individual members or any combination thereof.

[0038] The description of the steps in each embodiment in the specification is only for the convenience of explanation, and the implementation method of the present application is not limited by the order of implementation of the steps.

[0039] The present invention discloses a highly flame-retardant and low-smoke-releasing weldable coated cloth, wherein the coated cloth is prepared from the following raw materials in parts by weight: 80 to 120 parts of polyvinyl chloride resin, 40 to 60 parts of plasticizer, 10 to 30 parts of flame-retardant plasticizer, 20 to 50 parts of powdered flame retardant, 5 to 20 parts of smoke suppressant, 40 to 60 parts of functional filler and 10 to 20 parts of diluent.

[0040] In one embodiment of the present invention, the polyvinyl chloride resin is a resin powder for polyvinyl chloride paste. The plasticizer includes at least one of dibutyl phthalate, diisononyl phthalate, dioctyl adipate, and dipropylheptyl phthalate.

[0041] The flame retardant plasticizer may include at least one of diphenyl isooctyl phosphate, tricresyl phosphate, diethylene glycol tetrakis(chloroisopropyl)bisphosphate, tris(1,3-dichloroisopropyl) phosphate, triisopropylphenyl phosphate, xylene monophenyl phosphate, and triphenyl phosphate.

[0042] The powder flame retardant may include a metal compound flame retardant; the metal compound flame retardant includes at least one of antimony trioxide, tin oxide, and zinc oxide; the smoke suppressant may include a powder smoke suppressant, and the powder smoke suppressant includes at least one of ammonium octamolybdate, molybdenum trioxide, calcium molybdate, aluminum oxide, and aluminum hydroxide.

[0043] The functional filler may include at least one of a stabilizer and a whitening and reinforcing filler; the diluent may be at least one of a D60 viscosity reducer, a D75 viscosity reducer, a D70 viscosity reducer, and a D80 viscosity reducer. The stabilizer may include at least one of a calcium zinc stabilizer, a barium zinc stabilizer, and a tin stabilizer; the reinforcing and whitening filler may include at least one of calcium carbonate, kaolin, talc, and titanium dioxide.

[0044] The present invention further discloses a method for preparing a highly flame-retardant, low-smoke-releasing weldable coated cloth. Figure 1 is a flow chart of a method for preparing a coated cloth according to an embodiment of the present invention; Figure 1 , the preparation method comprises:

[0045] [Step S1] Dispersing the flame retardant system and the smoke suppressant system in the plasticizer, mixing them evenly with a stirrer, and preparing a flame retardant and smoke suppressant paste with a grinder;

[0046] In one embodiment of the present invention, the rotation speed of the stirrer is 1000-3000 r / min, and the stirring is stopped when the measured temperature reaches 40-50° C.; the rotation speed of the grinder is 500-1000 r / min.

[0047] [Step S2] Mixing and stirring (using a stirring mechanism) a polyvinyl chloride resin (such as a resin powder for polyvinyl chloride paste), a plasticizer, a paste-like flame retardant slurry, a functional filler, and a diluent, and controlling the slurry temperature during the process to obtain a coating slurry;

[0048] In one embodiment, the speed of the stirrer may be 1000-2000 r / min, and the stirring is stopped when the measured temperature reaches 40-50° C.

[0049] [Step S3] Adding a flame retardant plasticizer to the coating slurry obtained in step S2, and mixing evenly using a stirrer;

[0050] In one embodiment, the stirring speed is 1000-2000 r / min, and the stirring is stopped after stirring for 1-5 minutes;

[0051] [Step S4] Using a viscosity reducer to adjust the viscosity of the coating slurry obtained in step S3 to meet the requirements of the machine;

[0052] [Step S5] Use a coating machine to evenly scrape the coating slurry obtained in step S4 onto the PET mesh, perform a gelation reaction in an oven (or other drying equipment), and then roll up to obtain the product.

[0053] In one embodiment, the coating speed is 5-20 m / min, and the oven temperature is 150-210°C.

[0054] Table 1 Flame retardant performance requirements of GB 8624B1 (B-s2, d0) standard

[0055]

[0056] Table 1 is the flame retardant performance requirements of coated fabrics in GB 8624B1 (B-s2, d0) standard. This standard also requires the heat release rate, heat release amount, flame spread, burning rate, burning droplets, smoke generation rate, and smoke generation to be met.

[0057] Color difference and light transmittance are crucial parameters for the color accuracy and consistency of PVC coated cloth products. The present invention tests the L, a, and b values ​​of the coated cloth products respectively. The Lab values ​​represent the product brightness (L), red-green color (a), and yellow-blue color (b), respectively. When the L value is very low, the color will appear black or gray; when the a value is a positive number, the color will deviate toward the red direction, and when it is a negative number, it will tend to be green; when the b value is a positive number, the color will deviate toward the yellow direction, and when it is a negative number, it will tend to be blue. Therefore, the Lab value can accurately describe the color characteristics of the coated cloth product.

[0058] High-frequency welding and hot-air welding are commonly used connection methods in PVC coated fabric applications. The present invention tests the high-frequency welding and hot-air welding performance of coated fabric products. High-frequency welding is a technology that uses high-frequency electromagnetic waves to heat materials and fuse them together. The welding effect is judged by the peel strength of the coated fabric after welding. Hot-air welding is to heat and fuse the materials by blowing hot air to the welding area. The welding effect is judged by the maximum welding speed when the coated fabric reaches a peel strength of 90N / m.

[0059] The present invention constructs a compound flame retardant system and a compound smoke suppression system, and combines the adjustment of the production process to obtain a coated cloth that can meet the performance requirements of GB 8624B1 (B-s2, d0) such as flame retardancy, low smoke release, and anti-melt dripping. However, the flame retardant performance of the coated cloth prepared by a single flame retardant system and a single smoke suppression system in combination with a conventional pulping process can only reach the flame retardant grade of GB 8624B2 (D-s3, d0). The present invention uses a compound flame retardant and smoke suppression system, combined with the adjustment of the production process, to prepare a coated cloth, the product has a high apparent color whiteness, and the light-transmitting color is bluish. The coated cloth prepared by a single flame retardant system in combination with a conventional pulping process has a low apparent color whiteness, and the light-transmitting color is reddish. The present invention uses a compound flame retardant system and a compound smoke suppression system, combined with the adjustment of the production process, to prepare a coated cloth, the peel strength in high-frequency welding can reach 94N / m, and the maximum welding speed to achieve a peel strength of 90N / m in hot air welding is ≥8m / s. The coated cloth prepared by a single flame retardant system combined with a conventional pulping process has a high-frequency welding strength of about 87N / m, and a hot air welding peeling strength of 90N / m with a maximum welding speed of about 7m / s.

[0060] In one embodiment of the present invention, the plasticizer in the raw material is one or more of dibutyl phthalate, diisononyl phthalate, dioctyl adipate, and dipropylheptyl phthalate. The present invention uses a plasticizer to insert into the PVC molecular chain, disrupts the arrangement between PVC molecules, reduces intermolecular forces, improves the plasticity of the polyvinyl chloride resin, and significantly improves the processability.

[0061] The flame retardant plasticizer in the raw material is one or more of diphenyl isooctyl phosphate, tricresyl phosphate, diethylene glycol tetra(chloroisopropyl)bisphosphate, tris(1,3-dichloroisopropyl) phosphate, triisopropylphenyl phosphate, diphenyl phosphate, and triphenyl phosphate. The present invention uses phosphate ester or bromoester flame retardant plasticizers or chloroester flame retardant plasticizers to improve the flame retardancy of the system while playing a plasticizing role. The flame retardant mechanism of phosphate esters includes gas phase flame retardant mechanism and condensed phase flame retardant mechanism. The gas phase flame retardant mechanism is that the flame retardant plasticizer produces phosphate free radicals and phosphoric acid by thermal decomposition. In the gas phase, phosphate free radicals can react with highly active free radicals such as hydrogen free radicals and hydroxyl free radicals to produce free radical chain termination reactions, thereby reducing the combustion intensity in the gas phase; in the condensed phase, phosphoric acid has a strong dehydration property, which promotes the dehydration and carbonization of the polymer, and the carbon layer can isolate air and flames, and play a condensed phase flame retardant role. Brominated ester flame retardant plasticizers or chlorinated ester flame retardant plasticizers decompose when heated to produce halogen free radicals, which can undergo free radical chain termination reactions with hydrogen free radicals, hydroxyl free radicals, etc., thereby reducing the combustion intensity in the gas phase; the generated hydrogen halide gas is non-flammable and has a density greater than that of air. It forms a gas phase insulation layer on the combustion surface, thereby inhibiting the progress of combustion.

[0062] The metal compound flame retardant in the powder flame retardant is one or more of metal oxides, borates and metal hydroxides.

[0063] The metal oxide flame retardant in the powder flame retardant is one or more of antimony trioxide, zinc oxide, aluminum oxide, tin oxide, and molybdenum trioxide. The present invention constructs a composite flame retardant system by adjusting the ratio of antimony trioxide to one or more of tin oxide, zinc oxide, aluminum oxide, aluminum hydroxide, and magnesium hydroxide, thereby improving the flame retardancy of the coated cloth. Antimony trioxide and chlorine have a synergistic flame retardant effect, releasing effective flame inhibitor antimony trichloride, which can change the appearance of the carbon layer, making it crack-free, increasing the degree of graphitization, and improving the quality of the carbon layer. The addition of metal oxides has a catalytic carbonization effect, further improving the quality of the carbon layer, and making the carbon layer have better insulation, thereby improving the flame retardancy.

[0064] The borate flame retardant in the powder flame retardant is one or more of sodium borate, magnesium borate, zinc borate and ammonium borate. The present invention adds borate to replace part of antimony trioxide, and at the same time constructs a composite flame retardant system to improve the flame retardancy of the coated cloth. Borate flame retardants begin to release crystal water at 250-350°C, react with hydrogen chloride to generate boron chloride, zinc chloride, etc., which can inhibit and capture free active free radicals and prevent the continuous reaction of the combustion chain; at the same time, a covering layer is formed in the condensed phase to isolate air and heat and prevent the flame from continuing to burn.

[0065] The metal hydroxide flame retardant in the powder flame retardant is one or more of magnesium hydroxide and aluminum hydroxide. The present invention constructs a composite flame retardant system by adding metal hydroxides, thereby improving the flame retardancy of the coated cloth. The thermal decomposition temperatures of aluminum hydroxide and magnesium hydroxide are 235-350°C and 390-430°C, respectively. They are decomposed into metal oxides and water vapor when heated. The water vapor can take away heat and dilute the concentration of air and combustible gases in the air. The metal oxides in the condensed phase play a role in isolating oxygen and preventing heat diffusion, thereby improving the flame retardant performance.

[0066] The powder smoke suppressant is one or more of ammonium octamolybdate, molybdenum trioxide, calcium molybdate, aluminum oxide, and aluminum hydroxide. The present invention constructs a composite smoke suppressant system by adding one or more of ammonium octamolybdate, molybdenum trioxide, calcium molybdate, aluminum oxide, and aluminum hydroxide, thereby reducing the smoke release of the coated cloth.

[0067] The smoke suppression effect of ammonium octamolybdate and molybdenum trioxide mainly works through molybdenum compounds in the solid phase. During the combustion process, molybdenum compounds can promote the formation of a carbon layer, thereby reducing the generation of smoke. More than 90% of the molybdenum element remains in the carbon layer of the condensed phase, further enhancing the smoke suppression effect.

[0068] The functional filler in the raw materials is one or more of a stabilizer and a reinforcing and whitening filler.

[0069] The stabilizer in the functional filler is one or more of an organic tin stabilizer, a calcium zinc stabilizer, and a barium zinc stabilizer. The present invention improves the processability, thermal stability, and light stability of the coated cloth by adding a stabilizer. The reinforcing whitening filler in the functional filler is one or more of calcium carbonate, talcum powder, titanium dioxide, and kaolin. The present invention can improve the whiteness, wear resistance, scratch resistance, and hardness of the coated cloth by adding a reinforcing whitening filler.

[0070] The diluent in the raw material is one or more of D60 viscosity reducer, D75 viscosity reducer, D70 viscosity reducer and D80 viscosity reducer. The present invention prepares a slurry with appropriate viscosity by adding a diluent, and further prepares a coating cloth with stable performance.

[0071] The present invention also discloses a method for preparing a highly flame-retardant, low-smoke-releasing weldable coated cloth, comprising the following steps:

[0072] The flame retardant system and the smoke suppressant system are dispersed in the plasticizer, and the speed of the agitator is 500-3000r / min. After the dispersion is completed, a grinder is used to prepare a paste-like flame retardant and smoke suppressant slurry.

[0073] Mix polyvinyl chloride resin powder, plasticizer, paste-like flame retardant and smoke suppression slurry, other functional fillers and diluent, add into a stirrer and stir at a stirrer speed of 1000-3000r / min. Stop stirring when the slurry temperature rises to 40-50°C.

[0074] Add flame retardant plasticizer, stirrer speed is 1000-2000r / min, and beating time is 2min.

[0075] Use viscosity reducer to adjust the slurry viscosity to meet the machine requirements.

[0076] Use a scraper to evenly scrape the slurry onto the PET mesh, and control the amount of sizing so that the product weight reaches 1350g / m 2 , gelation reaction is carried out in an oven and then rolled up.

[0077] Example 1

[0078] The present embodiment provides a highly flame-retardant, low-smoke-releasing weldable coated cloth, wherein the slurry is prepared from the following raw materials in parts by mass: 100 parts of resin powder for polyvinyl chloride paste, 30 parts of diisononyl phthalate, 10 parts of dioctyl adipate, 2 parts of triphenyl phosphate, 2 parts of tricresyl phosphate, 6 parts of diphenyl isooctyl phosphate, 15 parts of tri(1,3-dichloroisopropyl) phosphate, 13 parts of antimony trioxide, 3 parts of zinc oxide, 3 parts of ammonium octamolybdate, 5 parts of zinc borate, 15 parts of magnesium hydroxide, 17 parts of aluminum hydroxide, 2.5 parts of barium zinc stabilizer, 30 parts of calcium carbonate, 10 parts of titanium dioxide, 5 parts of talc, and 15 parts of D80 solvent oil.

[0079] The method for preparing the highly flame retardant and low smoke release weldable coated fabric comprises the following steps:

[0080] Disperse 13 parts of antimony trioxide, 3 parts of zinc oxide, 3 parts of ammonium octamolybdate, and 5 parts of zinc borate in 10 parts of diisononyl phthalate, use a stirrer at a speed of 1000 r / min, and after dispersion, use a grinder to prepare a paste-like flame retardant and smoke suppressant slurry;

[0081] According to the requirements by mass, 10 parts of polyvinyl chloride resin powder, 20 parts of diisononyl phthalate, 10 parts of dioctyl adipate, paste-like flame retardant and smoke suppressant slurry, 15 parts of magnesium hydroxide, 17 parts of aluminum hydroxide, 2.5 parts of barium zinc stabilizer, 30 parts of calcium carbonate, 10 parts of titanium dioxide, 5 parts of talcum powder, and 10 parts of D80 solvent oil were mixed, added into a stirrer and stirred at a stirrer speed of 2000r / min. When the slurry temperature rises to 45°C, stirring was stopped;

[0082] Add 15 parts of tris(1,3-dichloroisopropyl) phosphate, the stirrer speed is 1000r / min, and the beating time is 2min;

[0083] Use 5 parts of D80 solvent oil to adjust the slurry viscosity to meet the machine requirements;

[0084] Use a scraper to evenly scrape the slurry on the PET mesh. The speed of the coating machine is 6m / min. The amount of sizing is controlled so that the product weight reaches 1350g / m 2 , oven at 190°C for gelation reaction, and then rolled up to obtain a highly flame retardant, low smoke release, weldable coated cloth.

[0085] Example 2

[0086] The present embodiment provides a highly flame-retardant, low-smoke-releasing weldable coated cloth, wherein the slurry is prepared from the following raw materials in parts by mass: 100 parts of resin powder for polyvinyl chloride paste, 25 parts of diisononyl phthalate, 15 parts of dioctyl adipate, 3 parts of triphenyl phosphate, 3 parts of tricresyl phosphate, 4 parts of diphenyl isooctyl phosphate, 13 parts of tri(1,3-dichloroisopropyl) phosphate, 11 parts of antimony trioxide, 7 parts of zinc borate, 2 parts of zinc oxide, 3 parts of ammonium octamolybdate, 10 parts of magnesium hydroxide, 27 parts of aluminum hydroxide, 2.5 parts of barium zinc stabilizer, 25 parts of calcium carbonate, 15 parts of titanium dioxide, 5 parts of talc, and 15 parts of D80 solvent oil.

[0087] The method for preparing the highly flame retardant and low smoke release weldable coated fabric comprises the following steps:

[0088] Disperse 11 parts of antimony trioxide, 7 parts of zinc borate, 2 parts of zinc oxide, and 3 parts of ammonium octamolybdate in 10 parts of dioctyl adipate, use a stirrer at a speed of 1000 r / min, and after dispersion, use a grinder to prepare a paste-like flame retardant and smoke suppressant slurry;

[0089] According to the requirements by mass, 100 parts of polyvinyl chloride resin powder, 25 parts of diisononyl phthalate, 5 parts of dioctyl adipate, paste-like flame retardant and smoke suppressant slurry, 13 parts of magnesium hydroxide, 20 parts of aluminum hydroxide, 2.5 parts of barium zinc stabilizer, 25 parts of calcium carbonate, 15 parts of titanium dioxide, 5 parts of talcum powder, and 10 parts of D80 solvent oil were mixed, added into a stirrer and stirred at a stirrer speed of 1500r / min. When the slurry temperature rises to 43°C, stirring was stopped;

[0090] Add 13 parts of tris(1,3-dichloroisopropyl) phosphate, the stirrer speed is 1000r / min, and the beating time is 2min;

[0091] Use 5 parts of D80 solvent oil to adjust the slurry viscosity to meet the machine requirements;

[0092] Use a scraper to evenly scrape the slurry on the PET mesh. The speed of the coating machine is 6m / min. The amount of sizing is controlled so that the product weight reaches 1350g / m 2 , oven at 190°C for gelation reaction, and then rolled up to obtain a highly flame retardant, low smoke release, weldable coated cloth.

[0093] Example 3

[0094] The present embodiment provides a highly flame-retardant, low-smoke-releasing weldable coated cloth, wherein the slurry is prepared from the following raw materials in parts by mass: 100 parts of resin powder for polyvinyl chloride paste, 20 parts of diisononyl phthalate, 20 parts of dioctyl adipate, 2 parts of triphenyl phosphate, 3 parts of tricresyl phosphate, 5 parts of diphenyl isooctyl phosphate, 12 parts of tri(1,3-dichloroisopropyl) phosphate, 10 parts of antimony trioxide, 8 parts of zinc borate, 2 parts of zinc oxide, 3 parts of ammonium octamolybdate, 10 parts of magnesium hydroxide, 27 parts of aluminum hydroxide, 2.5 parts of barium zinc stabilizer, 30 parts of calcium carbonate, 10 parts of titanium dioxide, 10 parts of talc, and 15 parts of D80 solvent oil.

[0095] The method for preparing the highly flame-retardant, low-smoke-releasing weldable coated cloth comprises the following steps:

[0096] Disperse 10 parts of antimony trioxide, 8 parts of zinc borate, 2 parts of zinc oxide, and 3 parts of ammonium octamolybdate in 10 parts of dioctyl adipate, use a stirrer at a speed of 1000 r / min, and after dispersion, use a grinder to prepare a paste-like flame retardant and smoke suppressant slurry;

[0097] According to the requirements by mass, 100 parts of polyvinyl chloride resin powder, 20 parts of diisononyl phthalate, 10 parts of dioctyl adipate, paste-like flame retardant and smoke suppressant slurry, 10 parts of magnesium hydroxide, 27 parts of aluminum hydroxide, 2.5 parts of barium zinc stabilizer, 30 parts of calcium carbonate, 10 parts of titanium dioxide, 10 parts of talcum powder, and 10 parts of D80 solvent oil were mixed, added into a stirrer and stirred at a stirrer speed of 1500r / min. When the slurry temperature rises to 45°C, stirring was stopped;

[0098] Add 12 parts of tris(1,3-dichloroisopropyl) phosphate, the stirrer speed is 1000r / min, and the beating time is 2min;

[0099] Use 5 parts of D80 solvent oil to adjust the slurry viscosity to meet the machine requirements;

[0100] Use a scraper to evenly scrape the slurry on the PET mesh. The speed of the coating machine is 6m / min. The amount of sizing is controlled so that the product weight reaches 1350g / m 2 , oven at 190°C for gelation reaction, and then rolled up to obtain a highly flame retardant, low smoke release, weldable coated cloth.

[0101] Example 4

[0102] The present embodiment provides a highly flame-retardant, low-smoke-releasing weldable coated cloth, wherein the slurry is prepared from the following raw materials in parts by mass: 100 parts of resin powder for polyvinyl chloride paste, 30 parts of diisononyl phthalate, 10 parts of dioctyl adipate, 5 parts of triphenyl phosphate, 2 parts of tricresyl phosphate, 3 parts of diisooctyl benzene phosphate, 10 parts of tri(1,3-dichloroisopropyl) phosphate, 9 parts of antimony trioxide, 9 parts of zinc borate, 3 parts of zinc oxide, 4 parts of ammonium octamolybdate, 8 parts of magnesium hydroxide, 30 parts of aluminum hydroxide, 2.5 parts of barium zinc stabilizer, 20 parts of calcium carbonate, 10 parts of titanium dioxide, 15 parts of talc, and 15 parts of D80 solvent oil.

[0103] The method for preparing the highly flame-retardant, low-smoke-releasing weldable coated cloth comprises the following steps:

[0104] Disperse 9 parts of antimony trioxide, 9 parts of zinc borate, 3 parts of zinc oxide and 3 parts of ammonium octamolybdate in 10 parts of diisononyl phthalate, use a stirrer at a speed of 1000 r / min, and after dispersion, use a grinder to prepare a paste-like flame retardant and smoke suppressant slurry;

[0105] According to the requirements by mass, 100 parts of polyvinyl chloride resin powder, 20 parts of diisononyl phthalate, 10 parts of dioctyl adipate, paste-like flame retardant and smoke suppressant slurry, 8 parts of magnesium hydroxide, 30 parts of aluminum hydroxide, 2.5 parts of barium zinc stabilizer, 25 parts of calcium carbonate, 15 parts of titanium dioxide, 5 parts of talcum powder, and 10 parts of D80 solvent oil were mixed, added into a stirrer and stirred at a stirrer speed of 1500r / min. When the slurry temperature rises to 43°C, stirring was stopped;

[0106] Add 10 parts of tris(1,3-dichloroisopropyl) phosphate, the stirrer speed is 1000r / min, and the beating time is 2min;

[0107] Use 5 parts of D80 solvent oil to adjust the slurry viscosity to meet the machine requirements;

[0108] Use a scraper to evenly scrape the slurry on the PET mesh. The speed of the coating machine is 6m / min. The amount of sizing is controlled so that the product weight reaches 1350g / m 2 , oven at 190°C for gelation reaction, and then rolled up to obtain a highly flame retardant, low smoke release, weldable coated cloth.

[0109] Comparative Example 1

[0110] The present comparative example provides a coated cloth, wherein the slurry is prepared from the following raw materials in parts by mass: 100 parts of resin powder for polyvinyl chloride paste, 30 parts of diisononyl phthalate, 10 parts of dioctyl adipate, 2 parts of triphenyl phosphate, 2 parts of tricresyl phosphate, 6 parts of diphenyl isooctyl phosphate, 15 parts of tri(1,3-dichloroisopropyl) phosphate, 13 parts of antimony trioxide, 3 parts of zinc oxide, 3 parts of ammonium octamolybdate, 5 parts of zinc borate, 15 parts of magnesium hydroxide, 17 parts of aluminum hydroxide, 2.5 parts of barium zinc stabilizer, 30 parts of calcium carbonate, 10 parts of titanium dioxide, 5 parts of talc, and 15 parts of D80 solvent oil.

[0111] The method for preparing the coated cloth comprises the following steps:

[0112] The raw materials required in the above comparative example 1 were mixed in a stirrer at a speed of 1500 r / min according to the mass ratio, and when the slurry temperature rose to 44° C., a final slurry was obtained;

[0113] Use a knife coater to evenly coat the slurry on the PET mesh at a speed of 6 m / min. The oven is set at 190° C. for gelation reaction, and then rolled up to obtain the coated cloth of Comparative Example 1.

[0114] Comparative Example 2

[0115] The present comparative example provides a flame retardant coated cloth, wherein the slurry is prepared from the following raw materials in parts by mass: 100 parts of resin powder for polyvinyl chloride paste, 40 parts of diisononyl phthalate, 10 parts of dioctyl adipate, 3 parts of triphenyl phosphate, 2 parts of tricresyl phosphate, 5 parts of xylene phenyl phosphate, 13 parts of antimony trioxide, 15 parts of magnesium hydroxide, 20 parts of aluminum hydroxide, 2.5 parts of barium zinc stabilizer, 30 parts of calcium carbonate, 10 parts of titanium dioxide, 10 parts of talc, and 15 parts of D80 solvent oil.

[0116] The method for preparing the coated cloth comprises the following steps:

[0117] The raw materials required in the above comparative example 2 were mixed in a stirrer at a speed of 1500 r / min according to the mass ratio. When the slurry temperature rose to 44° C., a final slurry was obtained;

[0118] Use a knife coater to evenly coat the slurry on the PET mesh at a speed of 6 m / min. The oven is set at 190° C. for gelation reaction, and then rolled up to obtain the coated cloth of Comparative Example 2.

[0119] Use a colorimeter to perform L, a, b and transmittance tests:

[0120] The coated cloths prepared in Examples 1, 2, 3, 4 and Comparative Examples 1 and 2 were tested for color difference and light transmittance. The test results are shown in Table 2.

[0121] Table 2 Color difference test data of Examples 1, 2, 3, 4 and Comparative Examples 1 and 2

[0122]

[0123]

[0124] From the test results of the color difference and transmittance of the coated cloth measured in Table 2, it can be seen that the L value of the high flame retardant, low smoke release weldable coated cloth prepared in the embodiment of the present invention is greater than the coated cloth prepared in Comparative Example 1, the a value and the b value are both less than the coated cloth prepared in Comparative Example 1 and Comparative Example 2, and the transmittance is greater than the coated cloth prepared in Comparative Example 1 and Comparative Example 2. The Lab values ​​represent the product brightness (L), red-green color (a) and yellow-blue color (b), respectively. When the L value is very low, the color will appear black or gray; when the a value is a positive number, the color will deviate toward the red direction, and when it is a negative number, it will tend to be green; when the b value is a positive number, the color will deviate toward the yellow direction, and when it is a negative number, it will tend to be blue. It can be seen that the composite flame retardant and smoke suppression system of the present invention, combined with the optimization of the production process, the prepared high flame retardant weldable coated cloth has the properties of high whiteness, greenish and bluish, and high transmittance.

[0125] GB 8624 flame retardant performance test:

[0126] The coated fabrics prepared in Examples 1, 2, 3, 4 and Comparative Example 1 were subjected to flame retardancy tests according to GB 8624 standard. The test results are shown in Table 3.

[0127] Table 3 Flame retardant performance test data of Examples 1, 2, 3, 4 and Comparative Examples 1 and 2 according to GB 8624

[0128]

[0129]

[0130] It can be seen from the test results of GB 8624 standard in Table 1 and Table 3 that the combustion growth rate index, total heat release in 600s, flame tip height in 60s, smoke generation rate index, and total smoke generation in 600s of the high flame retardant and low smoke release weldable coated cloth prepared in the embodiment of the present invention are all lower than those of the coated cloth prepared in Comparative Example 1 and Comparative Example 2. The smaller the combustion growth rate index, the total heat release in 600s, and the flame tip height in 60s, the better the flame retardant performance of the product; the lower the smoke generation rate index and the total smoke generation in 600s, the better the smoke release performance of the product. The flame retardant grade of the high flame retardant and low smoke release weldable coated cloth prepared in the embodiment of the present invention is GB 8624B1 (B-s2, d0), and the flame retardant grade of the coated cloth prepared in Comparative Example 1 is GB 8624B1 (C-s2, d0). The flame retardant grade of the highly flame-retardant and low-smoke-releasing weldable coated cloth prepared in the embodiment of the present invention is GB 8624B1 (B-s2, d0), and the flame retardant grade of the coated cloth prepared in Comparative Example 2 is GB 8624B2 (D-s3, d0). It can be seen that the flame retardant performance of the highly flame-retardant weldable coated cloth prepared by using the composite flame retardant and smoke suppression system combined with the optimization of the production process is much higher than that of the coated cloth prepared by using a single flame retardant system.

[0131] Welding performance test:

[0132] The coated fabrics prepared in Examples 1, 2, 3, 4 and Comparative Example 1 were subjected to high-frequency welding and hot-air welding tests. The test results are shown in Table 4.

[0133] Table 4 Welding performance test data of Examples 1, 2, 3, 4 and Comparative Examples 1 and 2

[0134]

[0135] It can be seen from the welding performance test results in Table 4 that the high-flame-retardant and high-weldability coated cloth prepared in the embodiment of the present invention has a high-frequency welding peel strength greater than 94N / m under the same welding conditions; in hot air welding, the maximum welding speed to achieve a peel strength of 90N / m is ≥8m / s; the coated cloth prepared in Comparative Example 1 has a high-frequency welding peel strength of 87N / m, and in hot air welding, the maximum welding speed to achieve a peel strength of 90N / m is only 7m / s. The coated cloth prepared in Comparative Example 2 has a high-frequency welding peel strength of 75N / m, and in hot air welding, the maximum welding speed to achieve a peel strength of 90N / m is only 6m / s. It can be seen that the use of a composite flame retardant and smoke suppression system, combined with the optimization of the production process, has better welding performance than the coated cloth prepared using a single flame retardant system.

[0136] In summary, the highly flame-retardant, low-smoke-releasing weldable coated cloth and its preparation method proposed in the present invention can solve the problems of low apparent whiteness, reddish light transmittance, low flame retardant efficiency and large smoke release in the existing flame-retardant coated cloth technology, and make the prepared flame-retardant coated cloth weldable.

[0137] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0138] The description and application of the present invention here are illustrative, and it is not intended to limit the scope of the present invention to the above-mentioned embodiments. The effects or advantages involved in the embodiments may not be embodied in the embodiments due to interference from various factors, and the description of the effects or advantages is not used to limit the embodiments. The deformation and change of the embodiments disclosed here are possible, and the replacement of the embodiments and the various equivalent parts are well known to those of ordinary skill in the art. It should be clear to those skilled in the art that the present invention can be implemented in other forms, structures, arrangements, proportions, and with other components, materials and parts without departing from the spirit or essential features of the present invention. Other deformations and changes can be made to the embodiments disclosed here without departing from the scope and spirit of the present invention.

Claims

1. A highly flame retardant, low smoke release weldable coated fabric, characterized in that: The coated cloth is prepared from the following raw materials in parts by weight: 80-120 parts of polyvinyl chloride resin, 40-60 parts of plasticizer, 10-30 parts of flame retardant plasticizer, 20-50 parts of powder flame retardant, 5-20 parts of smoke suppressant, 40-60 parts of functional filler and 10-20 parts of diluent.

2. The highly flame retardant and low smoke release weldable coated fabric according to claim 1, characterized in that: The polyvinyl chloride resin is resin powder for polyvinyl chloride paste.

3. The highly flame retardant and low smoke release weldable coated fabric according to claim 1, characterized in that: The plasticizer includes at least one of dibutyl phthalate, diisononyl phthalate, dioctyl adipate, and dipropylheptyl phthalate.

4. The highly flame retardant and low smoke release weldable coated fabric according to claim 1, characterized in that: The flame retardant plasticizer includes at least one of diphenyl isooctyl phosphate, tricresyl phosphate, diethylene glycol tetrakis(chloroisopropyl)bisphosphate, tris(1,3-dichloroisopropyl) phosphate, triisopropylphenyl phosphate, xylene monophenyl phosphate and triphenyl phosphate.

5. The highly flame retardant and low smoke release weldable coated fabric according to claim 1, characterized in that: The powder flame retardant includes a metal compound flame retardant; the metal compound flame retardant includes at least one of antimony trioxide, tin oxide, and zinc oxide; The smoke suppressant includes a powder smoke suppressant, and the powder smoke suppressant includes at least one of ammonium octamolybdate, molybdenum trioxide, calcium molybdate, aluminum oxide, and aluminum hydroxide.

6. The highly flame retardant and low smoke release weldable coated fabric according to claim 1, characterized in that: The functional filler includes at least one of a stabilizer and a whitening and reinforcing filler; the diluent is at least one of a D60 viscosity reducer, a D75 viscosity reducer, a D70 viscosity reducer, and a D80 viscosity reducer; The stabilizer includes at least one of a calcium zinc stabilizer, a barium zinc stabilizer, and a tin stabilizer; the reinforcing and whitening filler includes at least one of calcium carbonate, kaolin, talcum powder, and titanium dioxide.

7. A method for preparing a highly flame-retardant, low-smoke-releasing weldable coated cloth, characterized in that: The preparation method comprises: Step S1: dispersing a set amount of flame retardant and smoke suppressant in a plasticizer, mixing them evenly with a stirrer, and preparing a paste-like flame retardant and smoke suppressant slurry with a grinding device; Step S2: Mix and stir a set amount of polyvinyl chloride resin, plasticizer, paste-like flame retardant and smoke suppressant slurry, functional filler and diluent, and control the slurry temperature during the process to obtain a coating slurry; Step S3: adding a flame retardant plasticizer to the coating slurry and mixing the mixture uniformly by stirring; Step S4: using a viscosity reducer to adjust the viscosity of the coating slurry obtained in step S3 to meet the requirements of the machine; Step S5: Use a coating device to evenly coat the coating slurry obtained in step S4 on the PET mesh cloth, perform a gelation reaction in a drying device, and then roll up to obtain a highly flame-retardant, low-smoke-releasing, weldable coated cloth.

8. The preparation method according to claim 7, characterized in that: In the step S1, the rotation speed of the stirrer is 1000-3000 r / min, and the stirring is stopped when the measured temperature reaches 40-50° C.; the rotation speed of the grinder in the step S1 is 500-1000 r / min.

9. The preparation method according to claim 7, characterized in that: In step S2, the stirring speed is 1000-2000 r / min, and the stirring is stopped when the measured temperature reaches 40-50° C.; In step S3, the speed of the stirrer is 1000-2000 r / min, and stirring is stopped after stirring for 1-5 minutes.

10. The preparation method according to claim 7, characterized in that: In the step S5, the scraping speed is 5-20 m / min; the drying equipment is an oven, and the oven temperature is 150-210°C.

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