Process of Gluing and Laminating Cork and EVA Sponge

Abstract

The present invention relates to the technical field of wood product processing, and specifically relates to a process for gluing and laminating cork and EVA sponge. The present invention performs an anti-corrosion soaking treatment on the cork with a compound preservative component, which can endow the cork with relatively stable anti-corrosion performance, thereby improving the durability of the cork to a certain extent; soaking the anti-corrosion cork after anti-corrosion treatment in a compound flame retardant component can disperse ammonium polyphosphate and silica sol in the compound flame retardant component in the molecular gaps of the anti-corrosion cork, so that the obtained flame-retardant anti-corrosion cork has stable flame-retardant performance; the present invention performs surface modification on brucite powder with silane coupling agent 3-aminopropyltriethoxysilane, which can graft and adsorb the brucite powder with flame-retardant performance in the molecular gaps of the EVA sponge, thereby improving the flame-retardant performance of the EVA sponge; the self-made adhesive prepared from lignin and soy protein powder by the present invention has good shear strength and tensile strength.

Description

Technical Field

[0001] The present invention relates to the technical field of wood processing, and specifically relates to a process for gluing and laminating cork and EVA sponge. Background Art

[0002] Cork is commonly known as water pine, cork, and cork bark. The main tree species for producing cork are Quercus variabilis and Quercus suber. Since the material of cork is relatively soft and is easily corroded and worn, when making wood products from cork as raw material, the cork will be subjected to anti-corrosion treatment first. EVA is a copolymer formed by copolymerizing ethylene and acetic acid. The sponge prepared from it is EVA sponge. Currently, in the process of preparing cork handicrafts, the EVA sponge is adhered to the surface of the cork by gluing. However, in the prior art, the process of gluing and laminating cork and EVA sponge is only through simple adhesive connection, and the cork and EVA sponge are not pretreated before gluing. The durability of the cork handicrafts adhered with EVA sponge prepared by such a method is poor. If the performance of the cork and EVA sponge can be optimized respectively before adhesive connection, such as improving the anti-corrosion performance and flame retardant performance of the cork, the quality of the cork handicrafts adhered with EVA sponge can be greatly improved. Therefore, how to improve the existing process of gluing and laminating cork and EVA sponge has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0003] Technical Problem to be Solved

[0004] In view of the above-mentioned disadvantages existing in the prior art, the present invention provides a process for gluing and laminating cork and EVA sponge. After optimizing the performance of the cork and EVA sponge first, the two are adhered by a gluing and laminating process, so as to maintain the excellent performance of the cork handicrafts to a certain extent.

[0005] Technical Solution

[0006] To achieve the above object, the present invention is realized through the following technical solutions:

[0007] A process for gluing and laminating cork and EVA sponge, the process comprising the following steps:

[0008] Step1. Place the cork with a smooth surface into a vacuum barrel, evacuate to 8 kPa and maintain for 8 - 10 min. Then inhale the compound preservative component into the vacuum barrel to submerge the cork. After maintaining for 2 - 3 h, take out the cork, place it at room temperature for 24 h, and then dry it in an oven at 80°C for 3 - 5 h. The obtained product is denoted as anti-corrosion cork;

[0009] Step 2: Place the anticorrosive cork into a vacuum barrel, evacuate it to -0.08 MPa and maintain for 28 - 30 min. Then, suck the compound flame retardant component into the vacuum barrel to submerge the anticorrosive cork. After maintaining for 22 - 24 h, take out the cork and dry it in an oven at 45 - 50 °C for 24 h. The obtained product is denoted as flame-retardant and anticorrosive cork.

[0010] Step 3: Immerse the EVA sponge in the self-made flame retardant component for 2 - 3 h. After immersion, drain it and dry it in an oven at 55 - 60 °C until constant weight. The obtained product is denoted as flame-retardant modified EVA sponge.

[0011] Step 4: Brush the self-made adhesive on the surface of the flame-retardant and anticorrosive cork at an application amount of 200 g / m 2 . Then, lay the flame-retardant modified EVA sponge flat on the surface of the flame-retardant and anticorrosive cork brushed with the self-made adhesive. After pressing at a pressure of 2 - 3 MPa for 3 - 5 min, the gluing and lamination between the cork and the EVA sponge are completed.

[0012] Furthermore, the preparation method of the compound preservative component in Step 1 is as follows:

[0013] S1: Weigh the calculated amounts of formaldehyde and phenol and pour them into a flask. After stirring evenly, add the sodium hydroxide solution, and raise the temperature to 75 °C. After maintaining for 40 - 45 min, add the calculated amount of boric acid powder, and raise the temperature to 95 °C. After maintaining for 15 - 16 min, cool it to room temperature. The obtained product is denoted as boric acid compounded low-molecular phenolic resin. The molar ratio of phenol, formaldehyde, boric acid, and sodium hydroxide is 3:6:1:1.

[0014] S2: Weigh 20 parts by weight of disodium octaborate tetrahydrate, 1 part by weight of propiconazole, and 1 part by weight of tebuconazole and pour them into 100 parts by weight of distilled water. After adding 1 - 2 parts by weight of sodium dodecylbenzenesulfonate, stir for 8 - 10 min. The obtained product is denoted as preservative.

[0015] S3: Mix the boric acid compounded low-molecular phenolic resin in S1 and the preservative in S2 according to a weight ratio of 1:2, and stir for 5 - 8 min. The obtained product is the compound preservative component.

[0016] Furthermore, the concentration of the sodium hydroxide solution in S1 is 40%.

[0017] Furthermore, the stirring speed for uniform stirring in S1 is 200 - 300 r / min, the stirring time for uniform stirring is 3 - 5 min, the stirring speed in S2 is 400 - 500 r / min, and the stirring speed in S3 is 500 - 600 r / min.

[0018] Furthermore, the preparation steps of the compound flame retardant component in Step 2 are as follows:

[0019] Step 1, weighing ammonium polyphosphate and dissolving it in distilled water to prepare an ammonium polyphosphate solution with a concentration of 15%, and then weighing silica sol and dissolving it in distilled water to prepare a silica sol solution with a concentration of 20%;

[0020] Step 2: Mix the ammonium polyphosphate solution and the silica sol solution in step 1 in an equal volume ratio, and mix them evenly to obtain the composite flame retardant component.

[0021] Furthermore, the stirring speed for uniform mixing in step 2 is 300-500 r / min, and the stirring time is 5-6 min.

[0022] Furthermore, the preparation method of the homemade flame retardant component in Step 3 is: pouring brucite powder into an ethanol aqueous solution at a solid-liquid ratio of 1:3 g / mL, stirring at a stirring speed of 200-300 r / min for 8-10 minutes, adding 3-aminopropyltriethoxysilane with a weight of 5-8% of brucite, and continuing to stir at the original stirring speed for 10-15 minutes to obtain the homemade flame retardant component.

[0023] Furthermore, in the preparation method of the homemade flame retardant component, the concentration of the ethanol aqueous solution is 95%.

[0024] Furthermore, the preparation method of the homemade adhesive in Step 4 is:

[0025] 1) Weigh 6-8 parts by weight of n-dodecyl mercaptan and 5-6 parts by weight of sodium methoxide and add them into 95-100 parts by weight of dimethylformamide to fully dissolve, then drop 20% sodium hydroxide solution to adjust the pH value to 12, add 35-40 parts by weight of lignin under nitrogen atmosphere, heat to 140°C in an oil bath and keep warm for 4-5 hours, the obtained result is recorded as the first component;

[0026] 2) After cooling the first component to room temperature, filter out the filtrate and wash the filtered lignin with distilled water, then add the lignin to a washing liquid component prepared by mixing acetyl bromide and acetic acid, react under vacuum conditions at 60°C for 2 hours, filter, wash with distilled water, and drain to obtain the acetylated lignin;

[0027] 3) Add 15 - 18 parts by weight of acetylated lignin, 6 - 7 parts by weight of olive oil, 5 - 8 parts by weight of urea, and 48 - 50 parts by weight of distilled water into the reaction kettle. After heating to 80°C, stir at a stirring speed of 200 - 300 r / min for 5 - 6 min. Under stirring conditions, add 12 - 15 parts by weight of soy protein powder and continue stirring for 2 - 3 min. Then heat to 100°C and keep warm for 2 h. Add 1 - 2 parts by weight of diethylenetriamine and continue reacting for 2 h. After cooling to room temperature, add 1 - 2 parts by weight of polyether defoamer and 2 - 3 parts by weight of thickener sodium alginate. Stir until it becomes paste-like, and the obtained product is the self-made adhesive. The polyether defoamer is GP-type glycerol polyether.

[0028] Furthermore, the washing liquid in 2) is prepared by mixing acetyl bromide and acetic acid in a volume ratio of 3:1.

[0029] Beneficial effects

[0030] The present invention provides a process for gluing and laminating cork and EVA sponge. Compared with the existing well-known technologies, the present invention has the following beneficial effects:

[0031] 1. The present invention uses phenol, formaldehyde, and boric acid as raw materials and sodium hydroxide as a catalyst to prepare boric acid-compounded low-molecular-weight phenolic resin. After compounding it with a preservative, the cork is subjected to anti-corrosion soaking treatment, which can make the cork have relatively stable anti-corrosion performance, thereby improving the durability of the cork to a certain extent. Secondly, soaking the anti-corrosion cork after anti-corrosion treatment in the compounded flame retardant component can disperse ammonium polyphosphate and silica sol in the molecular gaps of the anti-corrosion cork, so that the prepared flame-retardant anti-corrosion cork has stable flame retardant performance.

[0032] 2. The present invention uses 3-aminopropyltriethoxysilane, a silane coupling agent, to modify the surface of brucite powder, which can adsorb 3-aminopropyltriethoxysilane on the surface of brucite powder. Then, soaking the EVA sponge in the self-made flame retardant component can make 3-aminopropyltriethoxysilane play a grafting role, grafting and adsorbing the flame-retardant brucite powder in the molecular gaps of the EVA sponge, thereby improving the flame retardant performance of the EVA sponge. Finally, the self-made adhesive prepared from lignin and soy protein powder as raw materials has good shear strength and tensile strength, and also has good environmental protection effects. Therefore, the process for gluing and laminating cork and EVA sponge provided by the present invention has good market promotion value. Specific embodiments

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] The present invention will be further described below in conjunction with embodiments.

[0035] Embodiment 1

[0036] A process for gluing and laminating cork and EVA sponge in this embodiment includes the following steps:

[0037] Step1: Place the cork with a smooth surface into a vacuum barrel, evacuate to 8 kPa and maintain for 8 min. Then, suck the compound preservative component into the vacuum barrel to submerge the cork. After maintaining for 2 h, take out the cork, place it at room temperature for 24 h, and then dry it in an oven at 80 °C for 3 h. The obtained product is denoted as preservative-treated cork.

[0038] Among them, the preparation method of the compound preservative component in Step1 is as follows:

[0039] S1: Weigh the calculated amounts of formaldehyde and phenol and pour them into a flask. Stir at a stirring speed of 200 r / min for 3 min, then add a sodium hydroxide solution with a concentration of 40%, raise the temperature to 75 °C, keep warm for 40 min, add the calculated amount of boric acid powder, raise the temperature to 95 °C, keep warm for 15 min, and then cool to room temperature. The obtained product is denoted as boric acid compounded low-molecular-weight phenolic resin. The molar ratio of phenol, formaldehyde, boric acid, and sodium hydroxide is 3:6:1:1.

[0040] S2: Weigh 20 parts by weight of disodium octaborate tetrahydrate, 1 part by weight of propiconazole, and 1 part by weight of tebuconazole and pour them into 100 parts by weight of distilled water. Add 1 part by weight of sodium dodecylbenzenesulfonate and stir at a stirring speed of 400 r / min for 8 min. The obtained product is denoted as the preservative.

[0041] S3: Mix the boric acid compounded low-molecular-weight phenolic resin in S1 and the preservative in S2 according to a weight ratio of 1:2, and stir at a stirring speed of 500 r / min for 5 min. The obtained product is the compound preservative component.

[0042] Step2: Place the preservative-treated cork into a vacuum barrel, evacuate to -0.08 MPa and maintain for 28 min. Then, suck the compound flame retardant component into the vacuum barrel to submerge the preservative-treated cork. After maintaining for 22 h, take out the cork and dry it in an oven at 45 °C for 24 h. The obtained product is denoted as flame retardant and preservative-treated cork.

[0043] Among them, the preparation steps of the composite flame retardant component in Step 2 are:

[0044] Step 1, weighing ammonium polyphosphate and dissolving it in distilled water to prepare an ammonium polyphosphate solution with a concentration of 15%, and then weighing silica sol and dissolving it in distilled water to prepare a silica sol solution with a concentration of 20%;

[0045] Step 2: Mix the ammonium polyphosphate solution and the silica sol solution in step 1 in an equal volume ratio. The mixture is uniformly mixed to obtain a composite flame retardant component. The stirring speed for uniform mixing is 300 r / min and the stirring time is 5 min.

[0046] Step 3, soak the EVA sponge in the homemade flame retardant component for 2 hours, drain it after soaking and place it in an oven at 55°C to dry to constant weight, and the obtained sponge is recorded as flame retardant modified EVA sponge;

[0047] Among them, the preparation method of the homemade flame retardant component in Step 3 is: pour the brucite powder into a 95% ethanol aqueous solution at a solid-liquid ratio of 1:3 g / mL, stir at a stirring speed of 200 r / min for 8 minutes, add 3-aminopropyltriethoxysilane with a weight of 5% of brucite, and continue stirring at the original stirring speed for 10 minutes to obtain the homemade flame retardant component.

[0048] Step 4, according to 200g / m 2 The self-made adhesive was applied on the surface of the flame-retardant anti-corrosion cork with a glue application amount of 100%, and then the flame-retardant modified EVA sponge was spread on the surface of the flame-retardant anti-corrosion cork with the self-made adhesive, and the gluing and lamination between the cork and the EVA sponge were completed after pressing at a pressure of 2MPa for 3min;

[0049] Among them, the preparation method of the homemade adhesive in Step 4 is:

[0050] 1) Weigh 6 parts by weight of n-dodecyl mercaptan and 5 parts by weight of sodium methoxide and add them into 95 parts by weight of dimethylformamide to fully dissolve, then drop 20% sodium hydroxide solution to adjust the pH value to 12, add 35 parts by weight of lignin under nitrogen atmosphere, heat to 140°C in an oil bath and keep warm for 4 hours, the result is recorded as the first component;

[0051] 2) After the first component is cooled to room temperature, the filtrate is filtered to remove the filtrate and the filtered lignin is washed with distilled water. Then, the lignin is added to a washing liquid component prepared by mixing acetyl bromide and acetic acid in a volume ratio of 3:1, and reacted at 60°C under vacuum conditions for 2 hours. After filtering, it is washed with distilled water and drained to obtain the acetylated lignin;

[0052] 3) Add 15 parts by weight of acetylated lignin, 6 parts by weight of olive oil, 5 parts by weight of urea and 48 parts by weight of distilled water to the reactor. After heating to 80 °C, stir at a stirring speed of 200 r / min for 5 min. Under stirring conditions, add 12 parts by weight of soy protein powder and continue stirring for 2 min. Then heat to 100 °C and keep warm for 2 h. Add 1 part by weight of diethylenetriamine and continue reacting for 2 h. After cooling to room temperature, add 1 part by weight of polyether defoamer GP type glycerol polyether and 2 parts by weight of thickener sodium alginate. Stir until it becomes a paste, and the obtained product is the self-made adhesive.

[0053] Example 2

[0054] A process for gluing and laminating cork and EVA sponge in this example includes the following steps:

[0055] Step1. Place the cork with a smooth surface into a vacuum barrel, evacuate to 8 kPa and maintain for 10 min. Then suck the compound preservative component into the vacuum barrel to submerge the cork. After maintaining for 3 h, take out the cork, place it at room temperature for 24 h, and then dry it in an oven at 80 °C for 5 h. The obtained product is denoted as preservative-treated cork.

[0056] Among them, the preparation method of the compound preservative component in Step1 is as follows:

[0057] S1. Weigh the calculated amounts of formaldehyde and phenol and pour them into a flask. Stir at a stirring speed of 300 r / min for 5 min, then add a sodium hydroxide solution with a concentration of 40%, and raise the temperature to 75 °C. After maintaining for 45 min, add the calculated amount of boric acid powder, and raise the temperature to 95 °C. After maintaining for 16 min, cool to room temperature. The obtained product is denoted as boric acid compounded low-molecular-weight phenolic resin. The molar ratio of phenol, formaldehyde, boric acid and sodium hydroxide is 3:6:1:1.

[0058] S2. Weigh 20 parts by weight of disodium octaborate tetrahydrate, 1 part by weight of propiconazole and 1 part by weight of tebuconazole, pour them into 100 parts by weight of distilled water, add 2 parts by weight of sodium dodecylbenzenesulfonate, and stir at a stirring speed of 500 r / min for 10 min. The obtained product is denoted as preservative.

[0059] S3. Mix the boric acid compounded low-molecular-weight phenolic resin in S1 and the preservative in S2 according to a weight ratio of 1:2, and stir at a stirring speed of 600 r / min for 8 min. The obtained product is the compound preservative component.

[0060] Step2. Place the preservative-treated cork into a vacuum barrel, evacuate to -0.08 MPa and maintain for 30 min. Then suck the compound flame retardant component into the vacuum barrel to submerge the preservative-treated cork. After maintaining for 24 h, take out the cork and dry it in an oven at 50 °C for 24 h. The obtained product is denoted as flame retardant and preservative-treated cork.

[0061] Among them, the preparation steps of the composite flame retardant component in Step 2 are:

[0062] Step 1, weighing ammonium polyphosphate and dissolving it in distilled water to prepare an ammonium polyphosphate solution with a concentration of 15%, and then weighing silica sol and dissolving it in distilled water to prepare a silica sol solution with a concentration of 20%;

[0063] Step 2: Mix the ammonium polyphosphate solution and the silica sol solution in step 1 in an equal volume ratio. The mixture is uniformly mixed to obtain a composite flame retardant component. The stirring speed for uniform mixing is 500 r / min and the stirring time is 6 min.

[0064] Step 3, soak the EVA sponge in the homemade flame retardant component for 3 hours, drain it after soaking and place it in an oven at 60°C to dry to constant weight, and the obtained sponge is recorded as flame retardant modified EVA sponge;

[0065] Among them, the preparation method of the homemade flame retardant component in Step 3 is: pour the brucite powder into a 95% ethanol aqueous solution at a solid-liquid ratio of 1:3 g / mL, stir at a stirring speed of 300 r / min for 10 minutes, add 3-aminopropyltriethoxysilane with a weight of 8% of brucite, and continue stirring at the original stirring speed for 15 minutes to obtain the homemade flame retardant component.

[0066] Step 4, according to 200g / m 2 The self-made adhesive was applied on the surface of the flame-retardant anticorrosive cork with a glue application amount of , and then the flame-retardant modified EVA sponge was spread on the surface of the flame-retardant anticorrosive cork with the self-made adhesive, and the gluing and lamination between the cork and the EVA sponge was completed after pressing at a pressure of 3MPa for 5min;

[0067] Among them, the preparation method of the homemade adhesive in Step 4 is:

[0068] 1) Weigh 8 parts by weight of n-dodecyl mercaptan and 6 parts by weight of sodium methoxide into 100 parts by weight of dimethylformamide and fully dissolve them, then drop 20% sodium hydroxide solution to adjust the pH value to 12, add 40 parts by weight of lignin under nitrogen atmosphere, heat to 140°C in an oil bath and keep warm for 5 hours, the result is recorded as the first component;

[0069] 2) After the first component is cooled to room temperature, the filtrate is filtered to remove the filtrate and the filtered lignin is washed with distilled water. Then, the lignin is added to a washing liquid component prepared by mixing acetyl bromide and acetic acid in a volume ratio of 3:1, and reacted at 60°C under vacuum conditions for 2 hours. After filtering, it is washed with distilled water and drained to obtain the acetylated lignin;

[0070] 3) Add 18 parts by weight of acetylated lignin, 7 parts by weight of olive oil, 8 parts by weight of urea, and 50 parts by weight of distilled water to the reaction kettle. After heating to 80 °C, stir at a stirring speed of 300 r / min for 6 min. Under stirring conditions, add 15 parts by weight of soy protein powder and continue stirring for 3 min. Then heat to 100 °C and keep warm for 2 h. Add 2 parts by weight of diethylenetriamine and continue reacting for 2 h. After cooling to room temperature, add 2 parts by weight of polyether defoamer GP type glycerol polyether and 3 parts by weight of thickener sodium alginate. Stir until it becomes paste, and the obtained product is the self-made adhesive.

[0071] Example 3

[0072] A process for gluing and laminating cork and EVA sponge in this example includes the following steps:

[0073] Step1: Place the cork with a smooth surface into a vacuum barrel, evacuate to 8 kPa and maintain for 9 min. Then suck the compound preservative component into the vacuum barrel to submerge the cork. After maintaining for 3 h, take out the cork, place it at room temperature for 24 h, and then dry it in an oven at 80 °C for 4 h. The obtained product is denoted as preservative-treated cork.

[0074] Among them, the preparation method of the compound preservative component in Step1 is as follows:

[0075] S1: Weigh the calculated amounts of formaldehyde and phenol and pour them into a flask. Stir at a stirring speed of 300 r / min for 4 min, then add a sodium hydroxide solution with a concentration of 40%, and raise the temperature to 75 °C. Keep warm for 43 min, then add the calculated amount of boric acid powder, and raise the temperature to 95 °C. Keep warm for 16 min and then cool to room temperature. The obtained product is denoted as boric acid compounded low-molecular-weight phenolic resin. The molar ratio of phenol, formaldehyde, boric acid, and sodium hydroxide is 3:6:1:1.

[0076] S2: Weigh 20 parts by weight of disodium octaborate tetrahydrate, 1 part by weight of propiconazole, and 1 part by weight of tebuconazole and pour them into 100 parts by weight of distilled water. Add 2 parts by weight of sodium dodecylbenzenesulfonate and stir at a stirring speed of 500 r / min for 9 min. The obtained product is denoted as the preservative.

[0077] S3: Mix the boric acid compounded low-molecular-weight phenolic resin in S1 and the preservative in S2 according to a weight ratio of 1:2, and stir at a stirring speed of 500 r / min for 7 min. The obtained product is the compound preservative component.

[0078] Step2: Place the preservative-treated cork into a vacuum barrel, evacuate to -0.08 MPa and maintain for 29 min. Then suck the compound flame retardant component into the vacuum barrel to submerge the preservative-treated cork. After maintaining for 23 h, take out the cork and dry it in an oven at 48 °C for 24 h. The obtained product is denoted as flame retardant and preservative-treated cork.

[0079] Among them, the preparation steps of the composite flame retardant component in Step 2 are:

[0080] Step 1, weighing ammonium polyphosphate and dissolving it in distilled water to prepare an ammonium polyphosphate solution with a concentration of 15%, and then weighing silica sol and dissolving it in distilled water to prepare a silica sol solution with a concentration of 20%;

[0081] Step 2: Mix the ammonium polyphosphate solution and the silica sol solution in step 1 in an equal volume ratio. The mixture is uniformly mixed to obtain a composite flame retardant component. The stirring speed for uniform mixing is 400 r / min and the stirring time is 6 min.

[0082] Step 3, soak the EVA sponge in the homemade flame retardant component for 3 hours, drain it after soaking and place it in an oven at 58°C to dry to constant weight, and the obtained sponge is recorded as flame retardant modified EVA sponge;

[0083] Among them, the preparation method of the homemade flame retardant component in Step 3 is: pour the brucite powder into a 95% ethanol aqueous solution at a solid-liquid ratio of 1:3 g / mL, stir at a stirring speed of 300 r / min for 9 minutes, add 3-aminopropyltriethoxysilane with a weight of 7% of brucite, and continue stirring at the original stirring speed for 13 minutes to obtain the homemade flame retardant component.

[0084] Step 4, according to 200g / m 2 The self-made adhesive was applied on the surface of the flame-retardant anticorrosive cork with a glue application amount of , and then the flame-retardant modified EVA sponge was spread on the surface of the flame-retardant anticorrosive cork with the self-made adhesive, and the gluing and lamination between the cork and the EVA sponge was completed after pressing at a pressure of 3MPa for 4min;

[0085] Among them, the preparation method of the homemade adhesive in Step 4 is:

[0086] 1) Weigh 7 parts by weight of n-dodecyl mercaptan and 6 parts by weight of sodium methoxide into 98 parts by weight of dimethylformamide and fully dissolve them, then drop 20% sodium hydroxide solution to adjust the pH value to 12, add 38 parts by weight of lignin under nitrogen atmosphere, heat to 140°C in an oil bath and keep warm for 5 hours, the result is recorded as the first component;

[0087] 2) After the first component is cooled to room temperature, the filtrate is filtered to remove the filtrate and the filtered lignin is washed with distilled water. Then, the lignin is added to a washing liquid component prepared by mixing acetyl bromide and acetic acid in a volume ratio of 3:1, and reacted at 60°C under vacuum conditions for 2 hours. After filtering, it is washed with distilled water and drained to obtain the acetylated lignin;

[0088] 3) Add 17 parts by weight of acetylated lignin, 6 parts by weight of olive oil, 7 parts by weight of urea, and 49 parts by weight of distilled water to the reaction kettle. After heating to 80 °C, stir at a stirring speed of 300 r / min for 6 min. Under stirring conditions, add 14 parts by weight of soy protein powder and continue stirring for 3 min. Then heat to 100 °C and keep warm for 2 h. Add 2 parts by weight of diethylenetriamine and continue reacting for 2 h. After cooling to room temperature, add 2 parts by weight of polyether defoamer GP type glycerol polyether and 2 parts by weight of thickener sodium alginate. Stir until it becomes a paste, and the obtained product is the self-made adhesive.

[0089] Comparative Example 1

[0090] The process of gluing and laminating cork with EVA sponge in this comparative example is generally the same as that in Example 1. The main difference is that in this Comparative Example 1, the boric acid compounded with low molecular weight phenolic resin in the preparation method of the compounded preservative component in Example 1 is replaced with deionized water.

[0091] Comparative Example 2

[0092] The process of gluing and laminating cork with EVA sponge in this comparative example is generally the same as that in Example 1. The main difference is that in this Comparative Example 2, the compounded flame retardant component in Example 1 is replaced with a silica sol solution with a concentration of 20%.

[0093] Comparative Example 3

[0094] The process of gluing and laminating cork with EVA sponge in this comparative example is generally the same as that in Example 1. The main difference is that in this Comparative Example 3, the self-made adhesive in Example 1 is replaced with polyvinyl acetate emulsion wood adhesive.

[0095] Performance Test

[0096] Detect the performance of the flame-retardant and anti-corrosion cork, flame-retardant modified EVA sponge, and self-made adhesive in Examples 1-3 and Comparative Examples 1-3 of the present invention. The specific detection methods are as follows:

[0097] 1. Refer to the standard of GB / T2406.2-2009 to detect the flame retardant performance of the flame-retardant and anti-corrosion cork prepared in Examples 1-3 and Comparative Examples 1-2, and record its limiting oxygen index value;

[0098] 2. Refer to the standard of GB / T13942.1-2009 "Wood Durability" to detect the corrosion resistance of the flame-retardant and anti-corrosion cork prepared in Examples 1-3 and Comparative Examples 1-2. The lower the weight loss rate, the better the corrosion resistance;

[0099] 3. Refer to the standard of GB9846-2012 to detect the shear strength of the self-made adhesive in Examples 1-3 and the polyvinyl acetate emulsion wood adhesive in Comparative Example 3;

[0100] 4. The tensile strength and impact strength of the self-made adhesives in Examples 1-3 and the polyvinyl acetate emulsion wood adhesive in Comparative Example 3 were detected according to the standards of GB / T14074-2006.

[0101] The obtained data are recorded in the following table:

[0102]

[0103] It can be seen from the data in Table 1 that the flame retardancy and anti-corrosion properties of the flame retardant and anti-corrosion cork prepared in Examples 1-3 of the present invention are superior to those of the flame retardant and anti-corrosion cork prepared in Comparative Examples 1-2. Moreover, compared with the polyvinyl acetate emulsion wood adhesive in Comparative Example 3, the self-made adhesives prepared in Examples 1-3 of the present invention have higher shear strength, tensile strength and impact strength. Therefore, it shows that the process of laminating cork with EVA sponge with glue in the present invention has better application prospects.

[0104] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0105] The above embodiments are only used to illustrate the technical solutions of the present invention, not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A process for gluing and laminating cork and EVA sponge, characterized in that, The process includes the following steps: Step 1: Place the smoothly polished cork into a vacuum barrel, evacuate to 8 kPa and maintain for 8 - 10 min. Then, suck the compound preservative component into the vacuum barrel to submerge the cork. After maintaining for 2 - 3 h, take out the cork, place it at room temperature for 24 h, and then dry it in an oven at 80 °C for 3 - 5 h. The obtained product is denoted as preservative-treated cork. Step 2: Place the preservative-treated cork into a vacuum barrel, evacuate to -0.08 MPa and maintain for 28 - 30 min. Then, suck the compound flame retardant component into the vacuum barrel to submerge the preservative-treated cork. After maintaining for 22 - 24 h, take out the cork and dry it in an oven at 45 - 50 °C for 24 h. The obtained product is denoted as flame-retardant and preservative-treated cork. Step 3: Immerse the EVA sponge in the self-made flame retardant component for 2 - 3 h. After immersion, drain it and dry it in an oven at 55 - 60 °C until constant weight. The obtained product is denoted as flame-retardant modified EVA sponge. Step 4. Apply the self-made adhesive on the surface of the flame-retardant and anti-corrosion cork at a sizing amount of 200 g / m 2 . Then, lay the flame-retardant modified EVA sponge flat on the surface of the flame-retardant and anti-corrosion cork coated with the self-made adhesive. After pressing for 3 - 5 minutes under a pressure of 2 - 3 MPa, the gluing and lamination between the cork and the EVA sponge are completed.

2. The process of gluing and laminating cork and EVA sponge according to claim 1, characterized in that, The preparation method of the compound preservative component in Step 1 is as follows: S1: Weigh the calculated amounts of formaldehyde and phenol and pour them into a flask. After stirring evenly, add sodium hydroxide solution, and raise the temperature to 75 °C. Keep the temperature for 40 - 45 min, then add the calculated amount of boric acid powder, and raise the temperature to 95 °C. Keep the temperature for 15 - 16 min and then cool to room temperature. The obtained product is denoted as boric acid compounded low-molecular phenolic resin. The molar ratio of phenol, formaldehyde, boric acid, and sodium hydroxide is 3:6:1:

1. S2: Weigh 20 parts by weight of disodium octaborate tetrahydrate, 1 part by weight of propiconazole, and 1 part by weight of tebuconazole, pour them into 100 parts by weight of distilled water, add 1 - 2 parts by weight of sodium dodecylbenzenesulfonate, and stir for 8 - 10 min. The obtained product is denoted as the preservative. S3: Mix the boric acid compounded low-molecular phenolic resin in S1 and the preservative in S2 according to a weight ratio of 1:2, and stir for 5 - 8 min. The obtained product is the compound preservative component.

3. A process for gluing and laminating cork and EVA sponge according to claim 2, characterized in that, The concentration of the sodium hydroxide solution in S1 is 40%.

4. A process for gluing and laminating cork and EVA sponge according to claim 2, characterized in that, The stirring speed for even stirring in S1 is 200 - 300 r / min, and the stirring time for even stirring is 3 - 5 min. The stirring speed in S2 is 400 - 500 r / min, and the stirring speed in S3 is 500 - 600 r / min.

5. A process for gluing and laminating cork and EVA sponge according to claim 1, characterized in that, The preparation steps of the compound flame retardant component in Step 2 are as follows: Step 1: Weigh ammonium polyphosphate and dissolve it in distilled water to prepare an ammonium polyphosphate solution with a concentration of 15%. Then, weigh silica sol and dissolve it in distilled water to prepare a silica sol solution with a concentration of 20%. Step 2: Mix the ammonium polyphosphate solution and the silica sol solution in Step 1 according to an equal volume ratio. After mixing evenly, the obtained product is the compound flame retardant component.

6. A process for gluing and laminating cork and EVA sponge according to claim 5, characterized in that, The stirring speed for even mixing in Step 2 is 300 - 500 r / min, and the stirring time is 5 - 6 min.

7. A process for gluing and laminating cork and EVA sponge according to claim 1, characterized in that, The preparation method of the self-made flame retardant component in the Step 3 is as follows: pouring brucite powder into an ethanol aqueous solution at a solid-liquid ratio of 1:3 g / mL, stirring at a stirring speed of 200-300 r / min for 8-10 minutes, adding 3-aminopropyltriethoxysilane in an amount of 5-8% by weight of brucite, and continuing to stir at the original stirring speed for 10-15 minutes to obtain the self-made flame retardant component.

8. A process for gluing and laminating cork and EVA sponge according to claim 7, characterized in that, In the preparation method of the homemade flame retardant component, the concentration of the ethanol aqueous solution is 95%.

9. A process for gluing and laminating cork and EVA sponge according to claim 1, characterized in that, The preparation method of the homemade adhesive in Step 4 is: 1) Weigh 6-8 parts by weight of n-dodecyl mercaptan and 5-6 parts by weight of sodium methoxide and add them into 95-100 parts by weight of dimethylformamide to fully dissolve, then drop 20% sodium hydroxide solution to adjust the pH value to 12, add 35-40 parts by weight of lignin under nitrogen atmosphere, heat to 140°C in an oil bath and keep warm for 4-5 hours, the obtained result is recorded as the first component; 2) After cooling the first component to room temperature, filter out the filtrate and wash the filtered lignin with distilled water, then add the lignin to a washing liquid component prepared by mixing acetyl bromide and acetic acid, react under vacuum conditions at 60°C for 2 hours, filter, wash with distilled water, and drain to obtain the acetylated lignin; 3) Add 15-18 parts by weight of acetylated lignin, 6-7 parts by weight of olive oil, 5-8 parts by weight of urea and 48-50 parts by weight of distilled water into the reactor, heat to 80°C and stir at a stirring speed of 200-300 r / min for 5-6 minutes, add 12-15 parts by weight of soy protein powder under stirring conditions and continue stirring for 2-3 minutes, then heat to 100°C and keep warm for 2 hours, then add 1-2 parts by weight of diethylenetriamine and continue to react for 2 hours, cool to room temperature, add 1-2 parts by weight of GP type glycerol polyether defoamer and 2-3 parts by weight of thickener sodium alginate, stir until it becomes a paste, and the resulting homemade adhesive is obtained.

10. A process for gluing and laminating cork and EVA sponge according to claim 9, characterized in that, The washing liquid component in 2) is prepared by mixing acetyl bromide and acetic acid in a volume ratio of 3:1.

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