Special environment-friendly water-based glue for inner core of fireproof door and preparation method thereof

Abstract

The invention belongs to the technical field of emulsion, and relates to an environment-friendly water-based glue special for an inner core of a fireproof door and a preparation method of the environment-friendly water-based glue special for the inner core of the fireproof door. 5 to 10 parts of deionized water; 0.15 to 0.3 part of a defoaming agent; 0.1 to 0.5 part of a pH regulator; 0.2 to 0.7 part of a thickening agent; 1.5-2 parts of a coalescing agent; 0.5-1 part of a dispersant; 30-40 parts of heavy calcium powder; and 10-15 parts of talcum powder. The preparation method comprises the following steps: firstly, adding the polyacrylate polymer and the deionized water into a reaction kettle, stirring, controlling the stirring speed to be 300-500r / min until the mixture is uniform, then sequentially adding the pH regulator, the coalescing agent, the dispersing agent and the defoaming agent, continuously stirring for 15-20 minutes, then adding the heavy calcium carbonate and the talcum powder, simultaneously adjusting the rotating speed to be 600-900r / min, uniformly mixing, then adding the dispersing agent and the defoaming agent, continuously stirring for 15-20 minutes, and uniformly mixing to obtain a finished product. And adding the thickening agent according to a small-amount and multi-time principle until the viscosity is qualified to obtain a finished product. The product disclosed by the invention has the advantages of extremely low VOC (Volatile Organic Compounds), no combustion or explosion, small odor, convenience in construction and the like, can be comparable with a double-component product in the aspects of paint film hardness, cohesiveness and the like, and is short in curing time and low in cost.

Description

Technical Field

[0001] This invention belongs to the field of water-based emulsion technology, specifically relating to an environmentally friendly water-based adhesive for the inner core of fire doors and its preparation method. Background Technology

[0002] With the increasing popularity and maturity of water-based coatings, people's needs are becoming more diverse. Fire doors are also widely used in people's lives. Commonly used base materials include cold-rolled steel plates, galvanized plates, fireproof glass, stainless steel, and wooden fire doors. They are made by bonding fireproof and heat-insulating materials, such as perlite and rock wool, with an inner core adhesive. Currently, most coatings on the market use two-component polyurethane systems, which have a short construction period, a longer curing time, and higher production costs. Some coatings use single-component products, but their adhesion is inferior to polyurethane systems, their hardness is lower, their adhesion to the substrate is poorer, and they have a stronger odor and higher VOCs.

[0003] Based on the shortcomings of existing products on the market, and in order to protect the environment and adhere to the concept of resource conservation, there is an urgent need to develop a new type of fire door core adhesive that is extremely low in VOC, non-flammable and non-explosive, has little odor, is easy to apply, and can be comparable to existing two-component products in terms of paint film hardness and adhesion, while having a short curing time and low cost. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a water-based environmentally friendly water-based fire door core adhesive and its preparation method. The core adhesive of this invention is a single-component coating that uses a novel inorganic resin and completely replaces organic solvents with water as the dispersion medium. It has advantages such as extremely low VOC, non-flammability and non-explosiveness, low odor, and convenient construction. Furthermore, it is comparable to two-component products in terms of film hardness and adhesion, has a short curing time, and is inexpensive.

[0005] The specific technical solution adopted in this invention is as follows:

[0006] An environmentally friendly water-based adhesive for fireproof door cores, comprising the following components in parts by weight:

[0007]

[0008] Preferably, the defoamer is SZ-A110 from Shanghai Tianyu Chemical Co., Ltd. The dispersant is 6392 from Puwei. The pH adjuster is one or a mixture of any two of AMP-95, dimethylethanolamine, and triethanolamine. The film-forming aid is a mixture of dodecyl alcohol ester and ethylene glycol butyl ether, with a mass ratio of 1:2. The thickener is 8W from Suzhou Yunzhi Chemical Co., Ltd. The mesh size of the heavy calcium carbonate powder is 800-900 mesh; the mesh size of the talc powder is 1200-1300 mesh.

[0009] The preparation method of the environmentally friendly water-based fire door core adhesive described above includes the following steps:

[0010] (1) Add the polyacrylate polymer and deionized water into the reactor in proportion, then turn on the stirring and control the stirring speed to 300-500 r / min until the mixture is uniform.

[0011] (2) Add pH adjuster, film-forming aid, dispersant and defoamer to the reactor in sequence, and continue stirring for 15-20 minutes;

[0012] (3) Continue to add heavy calcium carbonate and talc powder into the reactor, while adjusting the rotation speed to 600-900 r / min. After mixing evenly, add thickener in small amounts multiple times until it reaches 75-85 kDa (26±1℃) to obtain the core-specific adhesive.

[0013] The preparation method of the polyacrylate polymer described above includes the following steps:

[0014] (1) First, prepare material one according to the following mass ratio:

[0015]

[0016] Then prepare the inorganic resin according to the following mass ratio:

[0017] Material 1, 100-105 portions;

[0018] 35-45 parts of inorganic resin;

[0019] (2) First, stir 35-45% deionized water and 45-55% emulsifier evenly, then add styrene, isooctyl acrylate, n-butyl acrylate, acrylic acid, silane coupling agent, N-hydroxymethyl acrylamide and acrylamide in sequence, stir evenly and let stand for later use to obtain pre-emulsion.

[0020] (3) Add the remaining deionized water, emulsifier, and 3-10% pre-emulsion to the reactor equipped with a reflux condenser, thermometer and constant speed stirring device. After mixing evenly, heat to 80-90℃ and then add methyl methacrylate and stir for 5-15 minutes.

[0021] (4) Then add the initiator for initial initiation. After reacting for 10-15 minutes, add the remaining pre-emulsion and initiator dropwise into the reactor. After the reaction continues for 2-3 hours, keep warm for 1-1.5 hours and then cool down to 65-70℃ for post-treatment to eliminate residual monomers.

[0022] (5) Then cool down to 45-55℃ and add inorganic resin. Keep warm for 20-30 minutes, then cool down to room temperature and add pH adjuster, defoamer and bactericide. Stir evenly and filter to obtain polyacrylate polymer.

[0023] Preferably, the emulsifier is a mixture of sodium vinyl sulfonate (SVS) and ADEKA REASOAP SP-10, with a mass ratio of 1:1.

[0024] Preferably, the initiator is a mixture of sodium bisulfite and ammonium persulfate (APS) in a mass ratio of 1:1.

[0025] Preferably, the bactericide is one, two, or a mixture of three of N-methyl-isothiazolinone, 5-chloro-isothiazolinone, and 2-methyl-3-isothiazolinone.

[0026] Preferably, the inorganic resin is Tangshan Luanshuo's 7802.

[0027] Preferably, the defoamer is SZ-A110 from Shanghai Tianyu Chemical Co., Ltd. The pH adjuster is one or a mixture of any two of AMP-95, dimethylethanolamine, and triethanolamine.

[0028] The beneficial effects of this invention are:

[0029] 1. The core-specific adhesive prepared by this invention is suitable for special substrates such as galvanized sheet, 304 / 316 stainless steel, ABS, glass sheet, and aluminum sheet, as well as conventional substrates such as carbon steel sheet, tinplate, and concrete. It has a short curing time, excellent adhesion, and high hardness, comparable to two-component polyurethane products.

[0030] 2. The core adhesive prepared by this invention has a short drying time, fast curing rate, high hardness after curing, strong adhesion, and also has a certain degree of fire resistance.

[0031] 3. The core adhesive product obtained by this invention is basically odorless and highly environmentally friendly.

[0032] 4. The cost is about 40% lower than the market average, and the preparation and construction processes are simple and convenient. Detailed Implementation

[0033] The present invention will be further described below with reference to specific embodiments:

[0034] The defoamer used in this invention is SZ-A110 from Shanghai Tianyu Chemical, the dispersant is 6392 from Puwei, the thickener is 8W from Suzhou Yunzhi Chemical, and the inorganic resin is 7802 from Tangshan Luanshuo.

[0035] The fineness of the calcium carbonate powder is 800-900 mesh; the fineness of the talc powder is 1200-1300 mesh; the water is deionized water; and all other raw materials used, unless otherwise specified, can be purchased commercially.

[0036] I. Preparation of Polyacrylate Polymers

[0037]

[0038] After preparing the materials according to the examples in the table above, first stir 35-45% deionized water and 45-55% emulsifier evenly. Then, add styrene, isooctyl acrylate, n-butyl acrylate, acrylic acid, silane coupling agent, N-hydroxymethylacrylamide, and acrylamide in sequence, stir thoroughly, and let stand for later use to obtain a pre-emulsion. Add the remaining deionized water and emulsifier to a reactor equipped with a reflux condenser, thermometer, and constant-speed stirring device. Take 3-10% of the pre-emulsion, mix evenly, and heat to 80-90℃. Add methyl methacrylate and stir for 5-15 minutes; then add initiator for initial initiation, react for 10-15 minutes, then add the remaining pre-emulsion and initiator dropwise into the reactor, continue the reaction for 2-3 hours, keep warm for 1-1.5 hours, then cool down to 65-70℃; post-treatment: remove residual monomers, then cool down to 45-55℃ and add inorganic resin, keep warm for 20-30 minutes, then cool down to room temperature and add pH adjuster, defoamer, inorganic resin and bactericide, stir evenly and filter to obtain polyacrylate polymer.

[0039] The emulsifier is a mixture of sodium vinyl sulfonate (SVS) and ADEKA REASOAP SP-10, with a mass ratio of 1:1. The initiator is a mixture of sodium bisulfite and ammonium persulfate (APS), with a mass ratio of 1:1. The bactericide is one, two, or a mixture of three of N-methyl-isothiazolinone, 5-chloro-isothiazolinone, and 2-methyl-3-isothiazolinone. The inorganic resin is Tangshan Luanshuo's 7802. The pH adjuster is one or a mixture of two of AMP-95, dimethylethanolamine, and triethanolamine.

[0040] Sodium bisulfite and ammonium persulfate (APS) can be used as initiators separately. Ammonium persulfate can be used as the initial initiator, while sodium bisulfite can be used when adding subsequent initiators dropwise into the reactor.

[0041] II. Preparation of the inner core adhesive

[0042]

[0043]

[0044] After preparing the raw materials as described above, first add the polyacrylate polymer and deionized water to the reactor, then start stirring and control the stirring speed to 300-500 r / min until the mixture is uniform. Then add the pH adjuster, film-forming aid, dispersant, and defoamer in sequence. Continue stirring for 15-20 minutes, then add the heavy calcium carbonate and talc powder, while adjusting the stirring speed to 600-900 r / min. After the mixture is uniform, add the thickener in small amounts multiple times until the qualified viscosity is obtained to obtain the finished product.

[0045] The comparative example 1 in the table above uses a common competitor emulsion (XG-9106), rather than the polyacrylate polymer prepared by the method described in this invention.

[0046] III. Performance Testing

[0047]

[0048] In the table above, Note 3: The adhesion test method is as follows: apply a layer of coating to the substrate with a 200mm wire rod, place rock wool, cure at room temperature for 2 hours, and then test the adhesion; Note 1: galvanized sheet, 304 / 316 stainless steel, glass sheet, unpolished tinplate, cold-rolled steel sheet, aluminum sheet and other substrates; Note 2: ABS substrate.

[0049] As can be seen from the data in Table 1, the curing time, curing hardness, and 2h / 24h adhesion of the water-based fire door core adhesive of this invention are all superior to Comparative Example 1 and competing products on the market. This invention's product is a single-component coating, using a novel inorganic hybrid resin and replacing all organic solvents with water as the dispersion medium. It has advantages such as extremely low VOC, non-flammability, non-explosiveness, low odor, and convenient construction. It is suitable for spraying, roller coating, and scraping. Simultaneously, this product has good environmental friendliness, protecting painting workers and residents from the harm of toxic volatile substances. Furthermore, in terms of film hardness and adhesion, it is comparable to two-component products, meeting the performance requirements of fire door core adhesives, and is cost-effective.

Claims

1. An environmentally friendly water-based adhesive for the inner core of fireproof doors, characterized in that: The core adhesive comprises the following components in parts by weight:

2. The environmentally friendly water-based fireproof door core adhesive according to claim 1, characterized in that: The defoamer mentioned is SZ-A110 from Shanghai Tianyu Chemical Co., Ltd.

3. The environmentally friendly water-based fireproof door core adhesive according to claim 1, characterized in that: The dispersant mentioned is Protein 6392.

4. The environmentally friendly water-based fireproof door core adhesive according to claim 1, characterized in that: The pH regulator is one or a mixture of any two of AMP-95, dimethylethanolamine, and triethanolamine.

5. The environmentally friendly water-based fireproof door core adhesive according to claim 1, characterized in that: The film-forming aid is a mixture of dodecayl alcohol ester and ethylene glycol butyl ether, with a mass ratio of dodecayl alcohol ester to ethylene glycol butyl ether of 1:

2.

6. The preparation method of the environmentally friendly water-based fireproof door core adhesive as described in claim 1, characterized in that: The method steps include: (1) Add the polyacrylate polymer and deionized water into the reactor in proportion, then turn on the stirring and control the stirring speed to 300-500 r / min until the mixture is uniform. (2) Add pH adjuster, film-forming aid, dispersant and defoamer to the reactor in sequence, and continue stirring for 15-20 minutes; (3) Continue to add heavy calcium carbonate and talc powder into the reactor, while adjusting the rotation speed to 600-900 r / min. After mixing evenly, add thickener in small amounts multiple times until it reaches 75-85 kDa (26±1℃) to obtain the core-specific adhesive product.

7. The preparation method of the environmentally friendly water-based fireproof door core adhesive according to claim 6, characterized in that, The preparation method of the polyacrylate polymer includes the following steps: (1) First, prepare material one according to the following mass ratio: Then prepare the inorganic resin according to the following mass ratio: Material 1, 100-105 portions; 35-45 parts of inorganic resin; (2) First, stir 35-45% deionized water and 45-55% emulsifier evenly, then add styrene, isooctyl acrylate, n-butyl acrylate, acrylic acid, silane coupling agent, N-hydroxymethyl acrylamide and acrylamide in sequence, stir evenly and let stand for later use to obtain pre-emulsion. (3) Add the remaining deionized water, emulsifier, and 3-10% pre-emulsion to the reactor equipped with a reflux condenser, thermometer and constant speed stirring device. After mixing evenly, heat to 80-90℃ and then add methyl methacrylate and stir for 5-15 minutes. (4) Then add the initiator for initial initiation. After reacting for 10-15 minutes, add the remaining pre-emulsion and initiator dropwise into the reactor. After the reaction continues for 2-3 hours, keep warm for 1-1.5 hours. Then cool down to 65-70℃ for post-treatment to eliminate residual monomers. (5) Then cool down to 45-55℃ and add inorganic resin. Keep warm for 20-30 minutes, then cool down to room temperature and add pH adjuster, defoamer and bactericide. Stir evenly and filter to obtain polyacrylate polymer.

8. The preparation method of the environmentally friendly water-based fireproof door core adhesive according to claim 7, characterized in that: The emulsifier is a mixture of sodium vinyl sulfonate and ADEKA REASOAP SP-10, with a mass ratio of 1:

1.

9. The preparation method of the environmentally friendly water-based fireproof door core adhesive according to claim 7, characterized in that: The initiator is a mixture of sodium bisulfite and ammonium persulfate, with a mass ratio of 1:

1.

10. The preparation method of the environmentally friendly water-based fireproof door core adhesive according to claim 7, characterized in that: The bactericide is one, two, or a mixture of three of N-methyl-isothiazolinone, 5-chloro-isothiazolinone, and 2-methyl-3-isothiazolinone.

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