Flame-retardant water diversion glue for fireproof wet curtain and preparation method of flame-retardant water diversion glue

Abstract

The invention relates to a flame-retardant water diversion adhesive for a fireproof wet curtain, which comprises the following raw material components in percentage by weight: 55-93% of polyvinyl acetate emulsion and the balance of flame-retardant filler, the flame-retardant filler is magnesium hydroxide and / or expanded graphite; in the flame-retardant filler, the content of the magnesium hydroxide is 15-30%, and the content of the expanded graphite is not higher than 15%; or, the content of the expanded graphite is 7-15%, and the content of the magnesium hydroxide is not higher than 30%. According to the invention, the polyvinyl acetate emulsion is taken as a matrix, and the flame-retardant inorganic filler magnesium hydroxide and / or expanded graphite are compounded in a specific proportion, so that the obtained flame-retardant water diversion glue has lasting and excellent adhesive property and flame-retardant property in a long-term water immersion environment, and can be matched with wet curtains made of various materials for use.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to a flame retardant water-separating glue for fireproof wet curtains and a preparation method thereof. Background Art

[0002] Flame retardant water-dividing glue is essentially a fireproof polymer composite material, usually a multi-phase composite system with flame retardancy formed by adding various flame retardant substances, mainly some inorganic fillers, with polymer materials as the matrix. The flame retardant water-dividing glue widely used in wet curtains currently has the disadvantage of losing its flame retardancy after being soaked in water for a long time, and cannot meet the requirement of long-term flame retardancy of the flame retardant water-dividing glue for wet curtains under water immersion conditions.

[0003] Polyvinyl acetate emulsion is one of the glue varieties that has developed rapidly in recent years. It has good impact resistance and flexibility, but polyvinyl acetate emulsion itself is flammable and will produce black smoke with toxic gases when burned, which limits its application in the field of flame-retardant wet curtains. Therefore, it is of great significance to develop a flame-retardant water-separating glue for wet curtains with long-lasting flame retardancy in humid water immersion environments based on polyvinyl acetate emulsion.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a flame retardant water-separating glue for fireproof wet curtain and a preparation method thereof.

[0006] The technical solution adopted by the present invention is:

[0007] The present invention provides a flame retardant water-dividing glue for fireproof wet curtains. The raw material components, by weight, include: 55-93% polyvinyl acetate emulsion, and the balance is flame retardant filler;

[0008] The flame retardant filler is magnesium hydroxide and / or expanded graphite;

[0009] In the flame retardant filler, the content of magnesium hydroxide is 15-30%, and the content of expanded graphite is not higher than 15%;

[0010] Alternatively, the content of the expanded graphite is 7-15%, and the content of the magnesium hydroxide is not higher than 30%.

[0011] The flame retardant water-dividing glue for fireproof wet curtains proposed by the present invention is based on polyvinyl acetate emulsion, and is compounded with flame retardant inorganic fillers such as magnesium hydroxide and / or expanded graphite. Under a specific ratio, the flame retardant water-dividing glue obtained has long-lasting excellent bonding performance and flame retardant performance in a long-term water immersion environment, and can be matched with wet curtains of various materials. When encountering fire, on the one hand, magnesium hydroxide is decomposed by heat to generate corresponding metal oxides, and the carbon layer generated by the expansion of expanded graphite by heat covers the surface of the substrate, forming a protective layer that isolates flames and heat; on the other hand, the water vapor generated by the decomposition of magnesium hydroxide and the flame-retardant gas generated by the expanded graphite can absorb a large amount of latent heat and dilute the concentration of combustible gas, which can effectively improve the flame retardant performance of the polyvinyl acetate emulsion-based water-dividing glue.

[0012] Optionally, the solid content of the polyvinyl acetate emulsion is 25-44%.

[0013] Optionally, the particle size of the magnesium hydroxide is 150-400 mesh.

[0014] Optionally, the particle size of the expanded graphite is 80-150 meshes.

[0015] On the other hand, the present invention provides a method for preparing a flame-retardant water-separating glue for a fireproof wet curtain as described in any of the above technical solutions, comprising the following steps: stirring the flame-retardant filler for a first time until it is evenly dispersed, and then adding the polyvinyl acetate emulsion for a second time stirring until the flame-retardant filler is evenly dispersed in the polyvinyl acetate emulsion.

[0016] Optionally, the first stirring condition is: the first stirring temperature is 0-40° C., and the first stirring time is 15-60 min;

[0017] The conditions of the second stirring are: the temperature of the second stirring is 0-40° C., and the time of the second stirring is 30-60 min. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] The present invention provides a flame retardant water-dividing glue for fireproof wet curtains. The raw material components, by weight, include: 55-93% polyvinyl acetate emulsion, and the balance is flame retardant filler;

[0020] The flame retardant filler is magnesium hydroxide and / or expanded graphite;

[0021] In the flame retardant filler, the content of magnesium hydroxide is 15-30%, and the content of expanded graphite is not higher than 15%;

[0022] Alternatively, the content of the expanded graphite is 7-15%, and the content of the magnesium hydroxide is not higher than 30%.

[0023] In the present invention, when the content of magnesium hydroxide is 15-30%, the content of expanded graphite is not higher than 15%. For example, the content of magnesium hydroxide can be any value of 15%, 20%, 25%, 30%, etc., and at this time, the content of expanded graphite can be any value of 0%, 5%, 10%, 15%, etc. Alternatively, when the content of expanded graphite is 7-15%, the content of magnesium hydroxide is not higher than 30%. For example, the content of expanded graphite can be any value of 7%, 10%, 13%, 15%, etc., and at this time, the content of magnesium hydroxide can be any value of 0%, 8%, 13%, 20%, 28%, 30%, etc.

[0024] In a preferred embodiment of the present invention, the solid content of the polyvinyl acetate emulsion is 25-44%. In the present invention, the solid content of the polyvinyl acetate emulsion should not be less than 25%, otherwise the emulsion is too thin, which will cause the added flame retardant filler to sink and cause uneven distribution; at the same time, the solid content of the polyvinyl acetate emulsion should not be higher than 44%, otherwise the emulsion is too thick, which is not conducive to the uniform dispersion of the flame retardant filler, and affects the uniformity of the coating of the prepared flame retardant water-separating glue when used on the wet curtain, which will eventually affect the flame retardant effect and bonding effect. For example, the solid content of the polyvinyl acetate emulsion can be any value of 25%, 30%, 35%, 40%, 44%, etc., without special restrictions.

[0025] In a preferred embodiment of the present invention, the particle size of the magnesium hydroxide is 150-400 mesh.

[0026] In a preferred embodiment of the present invention, the particle size of the expanded graphite is 80-150 meshes.

[0027] The inventors found that by introducing magnesium hydroxide with a particle size of 150-400 mesh and expanded graphite with a particle size of 80-150 mesh into a polyvinyl acetate emulsion, within the above-mentioned particle size range, the particle sizes of the two are matched, the flame retardant water-separating glue has the best flame retardant performance, can achieve long-lasting water-resistant flame retardancy, and has little negative impact on mechanical properties.

[0028] On the other hand, the present invention provides a method for preparing a flame-retardant water-separating glue for a fireproof wet curtain as described in any of the above technical solutions, comprising the following steps: stirring the flame-retardant filler for a first time until it is evenly dispersed, and then adding the polyvinyl acetate emulsion for a second time stirring until the flame-retardant filler is evenly dispersed in the polyvinyl acetate emulsion.

[0029] In a preferred embodiment of the present invention, the conditions for the first stirring are: the temperature of the first stirring is 0-40° C., and the time of the first stirring is 15-60 min;

[0030] The conditions of the second stirring are: the temperature of the second stirring is 0-40° C., and the time of the second stirring is 30-60 min.

[0031] Example 1

[0032] A flame retardant water-dividing adhesive for fireproof wet curtains, the raw material components are 100% by weight, including: 85% polyvinyl acetate emulsion (solid content is 44%), and the balance is flame retardant filler;

[0033] The flame retardant filler is magnesium hydroxide (particle size is 150 mesh).

[0034] The preparation method is as follows: the flame retardant filler is first stirred at a stirring temperature of 25°C for 15 minutes until it is evenly dispersed, and then the polyvinyl acetate emulsion is added and stirred for a second time at a stirring temperature of 25°C for 45 minutes until the flame retardant filler is evenly dispersed in the polyvinyl acetate emulsion.

[0035] Example 2

[0036] A flame retardant water-dividing adhesive for fireproof wet curtains, the raw material components are 100% by weight, including: 90% polyvinyl acetate emulsion (solid content is 35%), and the balance is flame retardant filler;

[0037] The flame retardant filler is expanded graphite (particle size is 80 meshes).

[0038] The preparation method is the same as Example 1.

[0039] Example 3

[0040] A flame retardant water-dividing adhesive for fireproof wet curtains, the raw material components are 100% by weight, including: 80% polyvinyl acetate emulsion (solid content is 44%), and the balance is flame retardant filler;

[0041] The flame retardant filler is 13% magnesium hydroxide (with a particle size of 300 meshes) and 7% expanded graphite (with a particle size of 150 meshes).

[0042] The preparation method is the same as Example 1.

[0043] Example 4

[0044] A flame retardant water-dividing adhesive for fireproof wet curtains, the raw material components are 100% by weight, including: 80% polyvinyl acetate emulsion (solid content is 40%), and the balance is flame retardant filler;

[0045] The flame retardant filler is 15% magnesium hydroxide (with a particle size of 150 meshes) and 5% expanded graphite (with a particle size of 80 meshes).

[0046] The preparation method is the same as Example 1.

[0047] Comparative Example 1

[0048] A flame retardant water-dividing adhesive, the raw material components of which are 100% by weight, including: 80% polyvinyl acetate emulsion (solid content is 60%), and the balance is flame retardant filler;

[0049] The flame retardant filler is 15% magnesium hydroxide (with a particle size of 350 meshes) and 5% expanded graphite (with a particle size of 150 meshes).

[0050] The preparation method is the same as Example 1.

[0051] Comparative Example 2

[0052] A flame retardant water-dividing adhesive, the raw material components of which are 100% by weight, including: 80% polyvinyl acetate emulsion (solid content is 44%), and the balance is flame retardant filler;

[0053] The flame retardant filler is 15% magnesium hydroxide (with a particle size of 600 meshes) and 5% expanded graphite (with a particle size of 80 meshes).

[0054] The preparation method is the same as Example 1.

[0055] Comparative Example 3

[0056] A water-separating glue comprises 100% by weight of raw material components: 100% polyvinyl acetate emulsion (solid content is 44%).

[0057] The preparation method is as follows, comprising the following steps: subjecting the polyvinyl acetate emulsion to a second stirring at a stirring temperature of 25° C. for a stirring time of 45 minutes to obtain the product.

[0058] The performance of the water-separating glues prepared in Examples 1-4 and Comparative Examples 1-3 was tested, and the results are recorded in Table 1.

[0059] The test method is as follows:

[0060] Appearance: Under 500LX lighting environment, visually inspect the sample color, then use a scraper to evenly scrape the sample onto the plastic film to observe the fineness of the glue and whether there are obvious impurities, lumps, precipitation, bubbles, etc.

[0061] Solid content: measured according to GB / T 2793-1995.

[0062] Peel strength: Tested according to GB / T 2790-1995 Adhesive 180° Peel Strength Test Method Flexible Material to Rigid Material.

[0063] Peel strength 1: After two wet curtains are bonded and overlapped, they are cured at room temperature (23±2℃) for 48 hours to observe whether they are debonded. If they are not debonded, the peel strength of the test piece is tested.

[0064] Flame retardant performance 1: After two wet curtains are bonded and overlapped, they are cured at room temperature (23±2℃) for 48 hours. Use an alcohol blowtorch to burn the bonding point of the wet curtains to observe whether they are flammable, dripping, and whether they self-extinguish when away from the fire.

[0065] Peel strength 2: After the two wet curtains are bonded and overlapped, they are cured at room temperature (23±2℃) for 48 hours, then boiled in tap water at 100℃ for 2 hours, and left to dry naturally at room temperature (23±2℃) for 24 hours. After the operation is completed, observe whether there is debonding. If there is no debonding, test the peel strength of the specimen.

[0066] Flame retardant performance 2: After the two wet curtains are bonded and overlapped, they are cured at room temperature (23±2℃) for 48 hours, then boiled in tap water at 100℃ for 2 hours, and left to dry naturally at room temperature (23±2℃) for 24 hours. After drying, use an alcohol torch to burn the test piece to observe whether it is flammable, dripping, and whether it self-extinguishes when away from the fire.

[0067] Peel strength 3: After the two wet curtains are bonded and overlapped, they are cured at room temperature (23±2℃) for 48 hours, then soaked in tap water for 1 month, and left to dry naturally at room temperature (23±2℃) for 24 hours. After the operation is completed, observe whether there is debonding. If there is no debonding, test the peel strength of the specimen.

[0068] Flame retardant performance 3: After the two wet curtains are bonded and overlapped, they are cured at room temperature (23±2℃) for 48 hours, then soaked in tap water for 1 month, and naturally dried at room temperature (23±2℃) for 24 hours. After drying, use an alcohol torch to burn the test piece to observe whether it is flammable, dripping, and whether it self-extinguishes when leaving the fire.

[0069] Table 1

[0070]

[0071]

[0072] As shown in Table 1, the flame-retardant water-dividing glue for fireproof wet curtains prepared in Examples 1-4 of the present invention has a long-lasting water-immersion flame-retardant performance under a long-term water immersion environment, compared with Comparative Example 1 with too high solid content of polyvinyl acetate emulsion, Comparative Example 2 with mismatched particle size of flame-retardant filler, and Comparative Example 3 without adding flame-retardant filler. The flame-retardant performance does not fail after immersion in water for 1 month. At the same time, compared with Comparative Example 3, the flame-retardant water-dividing glue for fireproof wet curtains prepared in Examples 1-4 can still maintain a high peel strength after the introduction of inorganic flame-retardant fillers, and the peel strength 1 retention rates are 91.1%, 86.7%, 88.9%, and 93.3%, respectively, and still have good bonding properties even after immersion in water for 1 month.

[0073] The present invention has eliminated flame retardants such as aluminum hydroxide and ammonium polyphosphate through a large number of experiments. By considering the particle size matching of different flame retardant fillers and the changes in flame retardant properties caused by different solid contents of polyvinyl acetate emulsions, the above parameters are adjusted within a specified range. The prepared flame retardant water-separating glue for fireproof wet curtains can have long-lasting water-resistant and flame retardant properties while ensuring mechanical properties, and has broad application prospects.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flame retardant water-separating glue for fireproof wet curtains, the raw material components are 100% by weight, including: 55-93% polyvinyl acetate emulsion, the balance is flame retardant filler; The flame retardant filler is magnesium hydroxide and / or expanded graphite; In the flame retardant filler, the content of magnesium hydroxide is 15-30%, and the content of expanded graphite is not higher than 15%; Alternatively, the content of the expanded graphite is 7-15%, and the content of the magnesium hydroxide is not higher than 30%.

2. The flame retardant water-dividing glue for fireproof wet curtain according to claim 1, characterized in that: The solid content of the polyvinyl acetate emulsion is 25-44%.

3. The flame retardant water-dividing glue for fireproof wet curtain according to claim 1, characterized in that: The particle size of the magnesium hydroxide is 150-400 meshes.

4. The flame retardant water-dividing glue for fireproof wet curtain according to claim 1, characterized in that: The particle size of the expanded graphite is 80-150 meshes.

5. A method for preparing the flame retardant water-dividing glue for fireproof wet curtain according to any one of claims 1 to 4, comprising the following steps: The flame retardant filler is first stirred until it is evenly dispersed, and then added into the polyvinyl acetate emulsion for second stirring until the flame retardant filler is evenly dispersed in the polyvinyl acetate emulsion.

6. The method for preparing the flame retardant water-dividing glue for fireproof wet curtain according to claim 5, characterized in that: The conditions of the first stirring are: the temperature of the first stirring is 0-40° C., and the time of the first stirring is 15-60 min; The conditions of the second stirring are: the temperature of the second stirring is 0-40° C., and the time of the second stirring is 30-60 min.

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