Water-based scald-resistant coating adhesive for textiles and preparation method thereof

Abstract

The embodiment of the invention discloses a water-based scalding-resistant coating adhesive for textiles and a preparation method of the water-based scalding-resistant coating adhesive. The method comprises the following steps: weighing 70-80 parts by weight of polymerized water-based organic silicon resin, 10-15 parts by weight of a phosphate flame retardant, 3-5 parts by weight of a charring agent, 3-5 parts by weight of closed water-based polyurethane resin and 2-3 parts by weight of a thickening agent, and uniformly mixing to obtain basic glue; and adding 2-4 parts by weight of a cross-linking agent and 1-3 parts by weight of a catalyst into the basic glue, and uniformly mixing to obtain a finished product. According to the water-based scalding-resistant coating adhesive for the textiles, provided by the invention, when the coated textiles, especially chemical fiber light and thin fabrics with poorer high-temperature resistance, are in contact with high-temperature heat sources (such as sparks and cigarette ends), adhesive films are high-temperature-resistant and are not completely decomposed and damaged in a short time, and carbon is quickly formed on the surfaces; the fabric can be prevented from being scalded and perforated in a short time to hurt a human body, and meanwhile, the fabric has good soft hand feeling and is comfortable to wear. The glue solution disclosed by the invention is simple and convenient to apply, is suitable for clothing fabrics of most specifications, is water-based and environment-friendly, and has a wide market prospect.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of textile coating processing, and in particular to a water-based scalding-resistant coating adhesive for textiles and a preparation method thereof. Background Art

[0002] Chemical fiber fabrics commonly used in the clothing industry, such as nylon and polyester, are mostly thin fabrics with a high temperature resistance limit of about 220-250℃. If they are exposed to higher temperatures or heat sources with open flames, they are easily scalded and perforated, scalding the human body or even causing combustion. Anti-scalding clothing is often needed in some specific workplaces, such as the machinery manufacturing industry, construction, chemical industry, smelting and other fields, all of which require workers to wear anti-scalding clothing to avoid accidents; anti-scalding clothing is not limited to workplaces, but can also be used in life, such as outdoor travel, outdoor barbecues, etc. Due to the complex and changeable environment, if clothing has excellent anti-scalding performance, it can maximize the guarantee of personal health and property safety.

[0003] Anti-scalding of clothing refers to the use of special processing techniques to make the fabric resistant to high temperature scalding. The anti-scalding protection treatment of clothing fabrics generally adopts two methods: weaving and coating. The weaving method is generally woven through a number of composite yarns. The weaving process is complicated and the applicable fabric types are relatively single, which makes it difficult to promote and apply on a large scale; the coating method requires that the coating system has high temperature resistance, that is, it can maintain the integrity of the coating film and certain physical and mechanical properties when exposed to high temperatures, and at the same time, the ablation characteristics at high temperatures can form a dense carbonized layer or siliconized layer, and have good thermal insulation properties.

[0004] Patent CN112609458A discloses a method for preparing a flame-retardant and high-temperature resistant coating adhesive for textiles. The coating adhesive is mainly composed of polytetrafluoroethylene, polyurethane, and acrylic resin, and phosphorus-nitrogen flame retardants, phosphate flame retardants, and solvents, cross-linking agents, gas-phase silica, softeners and other additives are added. After high-temperature heating, stirring, grinding, thickening, and filtering, the flame-retardant and high-temperature resistant coating adhesive for textiles is obtained. After coating, the material can form a protective film at a high temperature of 200°C and can withstand a high temperature of 300°C; however, the high-temperature resistant range of polytetrafluoroethylene, polyurethane, acrylic resin and other materials in the glue composition does not exceed 300°C, and even if a large amount of flame retardants are added, the absolute high-temperature resistance of the main glue cannot be improved. Therefore, after the glue is formed into a film, it cannot protect the fabric from contacting a high-temperature heat source above 300°C, and can keep the cloth surface intact to prevent burns.

[0005] Patent CN102505437A discloses "a scald-proof textile and its preparation method". In a solvent, oxygen-free conditions and inert gas protection, textiles and grafted monomers are irradiated to cause a co-irradiation grafting reaction to obtain scald-proof textiles. The grafted monomers are temperature-sensitive monomers, that is, they are hydrophobic at temperatures above 32°C. When the temperature is above the phase transition point, the hydrophobic interactions within and between the grafted molecules of the scald-proof textile are strengthened to form a hydrophobic layer. If water with a higher temperature is splashed onto the surface of the textile, the high-temperature water will not be absorbed by the textile and will not stay on the surface of the textile due to its hydrophobic nature caused by the increase in temperature, thereby achieving the purpose of scald prevention. However, this type of scald-proof textile only relies on the hydrophobicity of its grafted compound to have the function of preventing hot water scalds, and cannot prevent the damage caused by scalding when the high-temperature heat source directly contacts the fabric surface. Summary of the invention

[0006] To this end, the embodiment of the present invention provides a water-based scalding-resistant coating adhesive for textiles and a preparation method thereof. The water-based scalding-resistant coating adhesive for textiles of the present invention enables the coated fabric, especially the light and thin chemical fiber fabric with poor high temperature resistance, to have the adhesive film resistant to high temperature and not be completely decomposed and destroyed in a short time when in contact with a high temperature heat source (such as a spark, a cigarette butt), and the surface quickly forms carbon, which can prevent the fabric from being scalded and perforated in a short time and thus harming the human body, and at the same time has a good soft feel and is comfortable to wear. The adhesive solution of the present invention is simple and convenient to use, suitable for most specifications of clothing fabrics, water-based and environmentally friendly, and has broad market prospects.

[0007] In order to achieve the above purpose, the embodiment of the present invention provides the following technical solutions:

[0008] According to a first aspect of an embodiment of the present invention, the present invention provides a method for preparing a water-based hot-scalding-resistant coating adhesive for textiles, the method comprising the following steps:

[0009] (1) weighing 70-80 parts by weight of a polymerized waterborne silicone resin, 10-15 parts by weight of a phosphate flame retardant, 3-5 parts by weight of a carbon-forming agent, 3-5 parts by weight of a blocked waterborne polyurethane resin, and 2-3 parts by weight of a thickener, and mixing them to obtain a base glue;

[0010] (2) Adding 2-4 parts by weight of a cross-linking agent and 1-3 parts by weight of a catalyst to the base glue, mixing well, and obtaining the textile water-based hot-scalding-resistant coating glue.

[0011] Furthermore, the polymerized waterborne silicone resin has a silicone content of 25-30%, an internal phase viscosity of 100,000-500,000 mPa·s, and a hydroxyl content of 0.005-0.01%. The polymerized waterborne silicone resin used in the present invention is FS-860E from Liaoning Hengxing Fine Chemicals.

[0012] Furthermore, the carbon-forming agent is pentaerythritol caged phosphate.

[0013] Furthermore, the blocked waterborne polyurethane resin is a blocked aliphatic polyisocyanate with methyl ethyl ketone oxime as a blocking agent, and the NCO content is 4-6%. The blocked waterborne polyurethane resin used in the present invention is DF-819 from Liaoning Hengxing Fine Chemicals.

[0014] Furthermore, the thickener is an associative polyurethane thickener. The thickener used in the present invention is PU-4 from Liaoning Hengxing Fine Chemicals.

[0015] Furthermore, the cross-linking agent is high hydrogen-containing silicone oil.

[0016] Furthermore, the catalyst is zinc isooctanoate.

[0017] Furthermore, the technical indicators of the base glue are:

[0018] Appearance: white viscous liquid;

[0019] Solid content: 50±2%;

[0020] Dynamic viscosity: 2000-4000mPa·s, 25℃.

[0021] It should be noted that, since the addition of the cross-linking agent and the catalyst will give the product a certain shelf life, it is necessary to carry out step (2) before use to obtain the final product, which is preferably ready for use.

[0022] According to a second aspect of an embodiment of the present invention, the present invention provides a water-based hot-scalding-resistant coating adhesive for textiles, which is made by the method described in any one of the above items.

[0023] The embodiments of the present invention have the following advantages:

[0024] 1. The present invention uses water-based organic silicone resin FS-860E as the main component, which is a linear hydroxy silicone oil with a silane coupling agent, and is catalytically polymerized at low temperature after high-speed shear emulsification to form a network macromolecular organic silicone resin with more active groups such as epoxy and amino. After adding a cross-linking agent high hydrogen silicone oil and a catalyst, it is cross-linked at high temperature to obtain a dense, soft, elastic network macromolecular organic silicone film. Since the main chain structure of the organic silicone resin molecule is -O-Si-O-, the silicon oxygen bond is long, the bond energy is high, and the covalent bond with 50% ionic bond characteristics also enhances its stability and is not easy to break; and since the silicone resin has a network structure and dense cross-linking points, the Si-O main chain is embedded in the substituent (such as -CH3, -C2H5) in a network form, which is shielded and not easily attacked by impurities. This network structure increases the activation energy of the main chain breakage, which is manifested as the high thermal stability of the organic silicone resin, and the chemical bonds of the molecules are not broken or decomposed under high temperature or radiation. Compared with polyurethane, acrylate and other materials commonly used in textile coating glues, it has better high temperature resistance.

[0025] 2. The phosphate flame retardant used in the present invention has good compatibility in an aqueous system. When exposed to an open flame (or cigarette butts, sparks) or high temperature, the final product, polymetaphosphoric acid, is a strong acid. As a strong dehydrating agent, it dehydrates and carbonizes the polymer, changes the mode of the polymer combustion process, and forms a carbon film on its surface to isolate the air. At the same time, it can also prevent heat transfer, thereby achieving flame retardant and anti-scalding effects.

[0026] 3. The pentaerythritol caged phosphate (PEPA) selected as the carbonizing agent of the present invention is a new type of environmentally friendly halogen-free flame retardant additive. Its unique cage structure is conducive to expansion into carbon, has high temperature resistance, high expansion ratio, excellent thermal stability, and rich carbon source and acid source. It will carbonize at high temperature and form a dense non-polar heat insulation protective layer containing -Si-C- and -Si-O- bonds on the surface of the material. It has the functions of oxygen isolation, heat insulation, smoke suppression, and dripping prevention. It has a good synergistic flame retardant effect when compounded with phosphate flame retardants, and effectively protects textiles, especially chemical fiber fabrics, from being scalded or scalded when in contact with high-temperature heat sources.

[0027] In summary, the present invention is mainly based on water-based silicone resin, and after high-temperature drying and cross-linking, the film can have high high-temperature resistance. It is matched with phosphate flame retardant and carbonizing agent pentaerythritol caged phosphate (PEPA) to have a synergistic effect, ensuring that the coated fabric can be carbonized quickly when it contacts a high-temperature heat source while the film is not completely broken, preventing the fabric from being scalded and catching fire, and achieving the effect of protecting the human body under the fabric from scalding. At the same time, the silicone resin has a soft film-forming property, and the coated fabric feels soft and is comfortable to wear. DETAILED DESCRIPTION

[0028] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Polymeric water-based silicone resin: FS-860E, Liaoning Hengxing Fine Chemicals;

[0030] Pentaerythritol caged phosphate (PEPA): CAS No.: 5301-78-0;

[0031] Closed waterborne polyurethane resin: DF-819, Liaoning Hengxing Fine Chemicals;

[0032] Water-based polyurethane thickener: PU-4, Liaoning Hengxing Fine Chemicals;

[0033] High hydrogen silicone oil: MHX-1107, hydrogen content 1.5-1.6%, Dow Corning;

[0034] Zinc 2-ethylhexanoate: CAS No.: 136-53-8.

[0035] In the following contents, unless otherwise specified, parts are by weight.

[0036] Example 1

[0037] This embodiment provides a water-based hot-scalding-resistant coating adhesive for textiles, and the preparation method thereof comprises the following steps:

[0038] (1) 70 parts of polymerized waterborne silicone resin, 20 parts of phosphate flame retardant, 3 parts of carbonizing agent, 4 parts of blocked waterborne polyurethane resin and 3 parts of thickener were stirred uniformly in a stainless steel kettle and thickened to a viscosity of 2200 mPa·s (25° C.);

[0039] (2) Add 2 parts of cross-linking agent high hydrogen silicone oil and 1 part of catalyst zinc isooctanoate to the product obtained in step (1), stir evenly to obtain the product.

[0040] Example 2

[0041] This embodiment provides a water-based hot-scalding-resistant coating adhesive for textiles, and the preparation method thereof comprises the following steps:

[0042] (1) 70 parts of polymerized waterborne silicone resin, 18 parts of phosphate flame retardant, 4 parts of carbonizing agent, 5 parts of blocked waterborne polyurethane resin and 3 parts of thickener were stirred uniformly in a stainless steel kettle and thickened to a viscosity of 2500 mPa·s (25° C.);

[0043] (2) Add 2 parts of cross-linking agent high hydrogen silicone oil and 1 part of catalyst zinc isooctanoate to the product obtained in step (1), stir evenly to obtain the product.

[0044] Example 3

[0045] This embodiment provides a water-based hot-scalding-resistant coating adhesive for textiles, and the preparation method thereof comprises the following steps:

[0046] (1) 75 parts of polymerized waterborne silicone resin, 15 parts of phosphate flame retardant, 4 parts of carbonizing agent, 4 parts of blocked waterborne polyurethane resin and 2 parts of thickener were stirred uniformly in a stainless steel kettle and thickened to a viscosity of 3100 mPa·s (25° C.);

[0047] (2) Add 2 parts of cross-linking agent high hydrogen silicone oil and 1 part of catalyst zinc isooctanoate to the product obtained in step (1), stir evenly to obtain the product.

[0048] Example 4

[0049] This embodiment provides a water-based hot-scalding-resistant coating adhesive for textiles, and the preparation method thereof comprises the following steps:

[0050] (1) 75 parts of polymerized waterborne silicone resin, 12 parts of phosphate flame retardant, 5 parts of carbonizing agent, 5 parts of blocked waterborne polyurethane resin and 3 parts of thickener were stirred uniformly in a stainless steel kettle and thickened to a viscosity of 3500 mPa·s (25° C.);

[0051] (2) Add 3 parts of cross-linking agent high hydrogen silicone oil and 2 parts of catalyst zinc isooctanoate to the product obtained in step (1), stir evenly to obtain the product.

[0052] Example 5

[0053] This embodiment provides a water-based hot-scalding-resistant coating adhesive for textiles, and the preparation method thereof comprises the following steps:

[0054] (1) 80 parts of polymerized waterborne silicone resin, 12 parts of phosphate flame retardant, 3 parts of carbonizing agent, 3 parts of blocked waterborne polyurethane resin and 2 parts of thickener were stirred uniformly in a stainless steel kettle and thickened to a viscosity of 3300 mPa·s (25° C.);

[0055] (2) Add 4 parts of high hydrogen silicone oil as a crosslinking agent and 3 parts of zinc isooctanoate as a catalyst to the product obtained in step (1), stir evenly, and obtain a product.

[0056] Example 6

[0057] This embodiment provides a water-based hot-scalding-resistant coating adhesive for textiles, and the preparation method thereof comprises the following steps:

[0058] (1) 80 parts of polymerized waterborne silicone resin, 10 parts of phosphate flame retardant, 5 parts of carbonizing agent, 3 parts of blocked waterborne polyurethane resin and 2 parts of thickener were stirred uniformly in a stainless steel kettle and thickened to a viscosity of 3800 mPa·s (25° C.);

[0059] (2) Add 4 parts of high hydrogen silicone oil as a crosslinking agent and 3 parts of zinc isooctanoate as a catalyst to the product obtained in step (1), stir evenly, and obtain a product.

[0060] Test Example 1

[0061] Application performance test of water-based hot-scalding-resistant coating adhesive for textiles of the present invention:

[0062] The coating adhesives of Examples 1-6 are coated on the base fabric respectively and baked at 160-170°C for 1-2 minutes. The dry weight gain is 10-20 g / m 2 After coating, place the fabric sample with the back facing up on the lining rack, heat it to 500℃ with an electric soldering iron, gently place the inclined plane of the soldering iron tip on the fabric for 30 seconds, and observe whether the fabric is perforated.

[0063] Test equipment: temperature-controlled internal heating electric soldering iron DL39416C (adjustable temperature 180-500°C), 45° bevel soldering iron tip (horseshoe shape, width 4mm), Nanjing Hailun Machinery Equipment Co., Ltd.

[0064] The test results are shown in Table 1 below.

[0065] Table 1 Hot-scalding test of coated fabrics

[0066]

[0067] It can be seen from the above table that the fabrics coated with Examples 1-6 can withstand being placed under a 500°C high temperature electric soldering iron for 30 seconds, and a uniform black carbon layer appears at the burned part, so that the coated fabric is not melted or burned through, effectively protecting the human body under the coated fabric from being burned or causing a fire.

[0068] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A method for preparing a water-based hot-scalding-resistant coating adhesive for textiles, characterized in that: The method comprises the following steps: (1) weighing 70-80 parts by weight of a polymerized waterborne silicone resin, 10-20 parts by weight of a phosphate flame retardant, 3-5 parts by weight of a carbon-forming agent, 3-5 parts by weight of a blocked waterborne polyurethane resin, and 2-3 parts by weight of a thickener, and mixing them to obtain a base glue; (2) Adding 2-4 parts by weight of a cross-linking agent and 1-3 parts by weight of a catalyst to the base glue, mixing well, and obtaining the water-based hot-scalding-resistant coating glue for textiles.

2. The method for preparing the water-based hot-scalding-resistant coating adhesive for textiles according to claim 1, characterized in that: The polymerized water-based silicone resin has a silicone content of 25-30%, an internal phase viscosity of 100,000-500,000 mPa·s, and a hydroxyl content of 0.005-0.01%.

3. The method for preparing the water-based hot-scalding-resistant coating adhesive for textiles according to claim 1, characterized in that: The carbon-forming agent is pentaerythritol caged phosphate.

4. The method for preparing the water-based hot-scalding-resistant coating adhesive for textiles according to claim 1, characterized in that: The blocked waterborne polyurethane resin is a blocked aliphatic polyisocyanate with methyl ethyl ketone oxime as a blocking agent, and the NCO content is 4-6%.

5. The method for preparing the water-based hot-scalding-resistant coating adhesive for textiles according to claim 1, characterized in that: The thickener is an associative polyurethane thickener.

6. The method for preparing the water-based hot-scalding-resistant coating adhesive for textiles according to claim 1, characterized in that: The cross-linking agent is high hydrogen-containing silicone oil.

7. The method for preparing the water-based hot-scalding-resistant coating adhesive for textiles according to claim 1, characterized in that: The catalyst is zinc isooctanoate.

8. The method for preparing the water-based hot-scalding-resistant coating adhesive for textiles according to claim 1, characterized in that: Technical indicators of the basic glue: Appearance: white viscous liquid; Solid content: 50±2%; Dynamic viscosity: 2000-4000mPa·s, 25℃.

9. A water-based hot-scalding-resistant coating adhesive for textiles, characterized in that: It is made by the method according to any one of claims 1-8.

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