JPH0770529A - Production of heat-insulating panel - Google Patents

Abstract

PURPOSE:To obtain a heat-insulating panel capable of being produced through bonding in a short time and excellent in adhesion, heat resistance and durability by coating a metal plate with an adhesive prepd. by blending a specific tacky copolymer latex with specific additives, and laminating thereon and contact- bonding thereto a heat-insulating material according to a specific method. CONSTITUTION:A metal plate is coated with an adhesive prepd. by blending a tacky styrene-butadiene-acrylic ester copolymer latex having a Tg of -20 to -5 deg.C and a gel content of 20 to 60wt.% with a chloroprene latex high in the rate of crystallization and a glycidyl silane coupling agent, followed by scattering of water with a far infrared heater. When the adhesive layer becomes translucent, a heat-insulating material is laminated on and contact-bonded to the metal plate to produce a heat-insulating panel. According to the foregoing procedure, adverse effects of an org. solvent on a fire and human bodies are very low since water is a solvent, and the heat-insulating material can be bonded to the metal plate in a short time despite the aq. adhesive to obtain the heat- insulating panel excellent in adhesion, heat resistance and durability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a wall material (siding material) for a building, a partition board, a wall material for a unit bath and a heat insulating panel for a ceiling board. More specifically, a heat insulation material such as rock wool board (rock wool), gypsum board, glass wool mat, etc., which is attached to a painted steel sheet or a steel sheet whose surface is made of vinyl chloride in a short time by using an aqueous adhesive. The present invention relates to a panel manufacturing method.

[0002]

2. Description of the Related Art Conventionally, a heat insulating panel composed of a steel plate and a heat insulating material, which has been cut into a predetermined size, is used as a solvent type chloroprene adhesive, a solvent type urethane adhesive and a styrene-butadiene copolymer. A polymer latex-based adhesive or the like was applied to the steel plate side by a spray or a roll coater, and a heat insulating material was immediately placed on the steel plate, and the deposition pressure was applied until the adhesive was dried and solidified and the adhesive strength was developed. Recently, due to environmental pollution problems, solvent-based adhesives, which have a high adhesive strength, are rapidly shifting to water-based adhesives.

[0003]

When using a water-based adhesive for heaping and curing, usually about half of the adhesive is water, and this water passes through the heat insulating material layer or scatters from the side surface of the panel to bond the adhesive. It took more than one hour for the force to be expressed, and the productivity was extremely poor in actual production, and there was a problem in the space for deposition. In particular, when a porous heat insulating material such as rock wool or glass wool is adhered, the adhesive penetrates into the heat insulating material layer and the adhesive layer at the interface of the base material that contributes to the adhesion becomes thin and the adhesive force does not develop. There was also.

[0004]

In the case of a water-based adhesive, how to disperse water is a key to productivity improvement.
If most of the water is scattered and then the heat insulating material is bonded, the penetration of the adhesive into the heat insulating material can be reduced, and the adhesive layer necessary for bonding can be secured. Therefore, as a result of extensive studies on the assumption that the heat insulating material is bonded when the adhesive layer becomes translucent by using a far infrared heater, as a result, a styrene-butadiene-acrylic acid ester copolymer latex having adhesiveness is used as a base. Even if the adhesive is over-dried, it can be adhered with adhesive force by using resin, and when a little water remains, chloroprene latex with a fast crystallization rate puts a heat insulating material on and crimps it. At that time, paying attention to the fact that it instantly gels into a rubber-like state and exhibits an adhesive force, and further, a glycidyl-based silane coupling agent is effective for improving the adhesiveness with inorganic and fibrous materials, It has been found that applying these formulations to a steel sheet and press-bonding a heat insulating material at the time when the adhesive layer becomes translucent is extremely effective for short-time adhesion. Equipment for applying adhesive to steel plates using an endless winding plate, then passing it through a drying facility and mechanically supplying heat-insulating material that has been cut to a specified size and roll-bonding it to cut the bonded panel to a specified size. Therefore, the inventors have found that the production line can be sufficiently integrated and the productivity can be remarkably improved by completing the above, and thus completed the present invention.

That is, the present invention is: Glass transition temperature -20 to -5 ° C, gel content 20 to 6
A styrene-butadiene-acrylic acid ester copolymer latex having an adhesive property of 0% by weight was coated with a chloroprene latex having a high crystallization rate and a glycidyl silane coupling agent on a metal plate, and the far infrared rays were applied. A method for producing a heat insulating panel, which comprises using a heater to disperse water, and then when the adhesive layer becomes translucent, heat insulating materials are attached and pressure-bonded. 2. The solid content of chloroprene latex having a high crystallization rate is 5 to 50 parts by weight, and the glycidyl silane coupling agent is 0 to 100 parts by weight of the solid content of the adhesive styrene-butadiene-acrylic acid ester copolymer latex. 0.02 to 2 parts by weight are blended, The method for producing a heat insulating panel according to claim 1, wherein. 3. Water content in the translucent adhesive layer is 5 to 20% by weight
The manufacturing method of the heat insulation panel according to claim 1, wherein Is.

Adhesive styrene-butadiene-acryl having a glass transition temperature (hereinafter abbreviated as Tg) of the present invention of -20 to -5 ° C and a gel content (toluene insoluble content of latex film) of 20 to 60% by weight. The acid ester copolymer latex (hereinafter referred to as "adhesive SBR") is heated to 70 ° C while purging with nitrogen gas by charging an autoclave kettle with a small amount of a surfactant and distilled water as in the case of the usual synthetic rubber latex production method. After warming, prepared beforehand with potassium persulfate which is a polymerization initiator, styrene, acrylate ester,
A mixed monomer composed of a functional group monomer and a molecular weight modifier and a part of butadiene are charged and reacted for 30 minutes to form seed particles of adhesive SBR. Then, the remaining mixed monomer is gradually added to distilled water and some surfactant under stirring to form a pre-emulsified monomer, continuously charged with butadiene for 8 hours, and the remaining monomer is reacted for about 8 hours. . After completion of the reaction, cool to 40 ° C or lower,
It is obtained by adjusting the pH to 7 to 8 with ammonia water or the like, and then filtering with a 300 mesh wire mesh.

The specific composition ratio of the monomer is as follows: styrene 40-55 parts by weight, butadiene 35-45 parts by weight, n-butyl acrylate or 2-ethylhexyl acrylate as an acrylic ester 5-15 parts by weight, and a functional group. 0.5 to 5 parts by weight of one kind selected from monomers having a carboxyl group such as acrylic acid, methacrylic acid, itaconic acid and fumaric acid as monomers, and a monomer having a hydroxyl group such as hydroxyethyl acrylate and hydroxyethyl methacrylate. 1 to 5 parts by weight of 1 type selected from tert dodecyl mercaptan or n dodecyl mercaptan 0.5 to 2 as a molecular weight modifier.
Parts by weight. By emulsion polymerization with the monomer composition in the above range, Tg is in the range of -20 to -5 ° C and the gel content is 20.
A tacky SBR in the range of -60 wt% is obtained. A particularly preferred Tg range is -18 to -7 ° C and a gel content of 25 to
It is in the range of 45 parts by weight. When Tg is less than -20 ° C, there is a problem in adhesive strength and heat resistance, and when Tg is more than -5 ° C, tackiness decreases, and if the adhesive is in an overdried state, adhesion failure occurs and practical use occurs. Lacks sex. If the gel content is less than 20% by weight, the tackiness will be reduced, and the adhesion will be poor in an over-dried state as with the phenomenon of Tg. If it exceeds 60% by weight, the molecular weight will be too low, resulting in problems in adhesive strength and heat resistance. .

The chloroprene latex (hereinafter abbreviated as CR) having a high crystallization rate of the present invention means that the crystallization rate by a dilatometer is t0.5 (min) (volume reduction is 1
/ Time to reach 2), display 3 at -5 ° C
It means CR that crystallizes in a short time of 000 minutes or less. Specifically, trade name LA-50 manufactured by Denki Kagaku Co., Ltd.
(T0.5 = 70 minutes / 20 ° C.), LM-50 (t0.5
= 2000 minutes / −5 ° C.), LA-60 (t0.5 = 23)
(For example, 00 minutes / −5 ° C.), and anion type latex is preferable, and LA-50, which is particularly quick to crystallize, is preferable in view of the adhesive force development rate after pressure bonding of the heat insulating material. The compounding ratio of CR is 5 to 50 in terms of solid content with respect to the solid content of adhesive SBR.
It is in the range of parts by weight, preferably in the range of 15 to 40 parts by weight. When the amount is less than 5 parts by weight, the adhesive force development rate and the adhesive force are insufficient, and when it exceeds 50 parts by weight, the yellowing of the adhesive agent
Poor practicality due to problems such as decreased stability during storage and increased cost.

Examples of the glycidyl silane coupling agent (hereinafter abbreviated as a coupling agent) of the present invention include γ-glycidoxymethyldimethoxysilane, γ-glycidoxypropyltrimethoxysilane and β- (3,4- Epoxycyclohexyl) ethyltrimethoxysilane and the like. Among them, γ-glycidoxypropyltrimethoxylane is preferable from the viewpoint of stability during storage with an aqueous latex and storage stability. The mixing ratio of the coupling agent is S
It is in the range of 0.05 to 2 parts by weight, preferably in the range of 0.2 to 0.5 parts by weight, based on 100 parts by weight of the solid content of BR. If the amount is less than 0.05 parts by weight, the adhesive force with rockwool and glass wool mat is insufficient, and if the amount is more than 2 parts by weight, the effect of improving the adhesive force is in an equilibrium state and economically disadvantageous.

The far infrared heater used in the present invention is 0,
Tube type heaters of 1 to 4 kW are used, and tube type heaters are preferable from the viewpoint of compatibility with heat insulating panels of various sizes, and a type with a reflection plate such as an aluminum plate attached to the top for the purpose of increasing radiation efficiency. A heater is preferred. The drying equipment in an actual line using this heater may be, for example, a box-shaped box having a width of 1 m, a length of 2 m, and a height of 0.3 m, which is provided with an exhaust port at the upper part and four 4 KW far-infrared tube heaters are attached. By controlling the gap between the heater and the steel sheet coated with the adhesive so that the surface temperature of the steel sheet is 120 to 180 ° C., and at the same time, controlling the speed of passing through the drying equipment, the adhesive layer is formed in several seconds. Translucency is possible. The water content in the translucent adhesive layer of the present invention is 5
Is in the range of up to 20% by weight. That is, the solid content of the adhesive is 80
It means to adhere in the range of up to 95% by weight. The preferable water content is in the range of 7 to 15% by weight. If the water content is less than 5% by weight, a part of the adhesive does not penetrate into the heat insulating material layer together with the water, the so-called anchoring effect cannot be obtained, the surface layer material of the heat insulating material is broken, and the adhesive strength becomes low. If it exceeds, it will be difficult to bond for a short time and it will be impractical. This water content is easily calculated by measuring the weight of the steel sheet immediately after applying the adhesive and the weight change after drying, but it can be visually determined when used.

As described above, the method for producing a heat insulating panel of the present invention is a water-based adhesive when combined with a drying facility using a far-infrared heater because the solvent is water and the organic solvent has a very low adverse effect on fire and human health. However, since it can be bonded for a short time, the effect of improving productivity is extremely large, and the adhesive strength, heat resistance, and durability are excellent, so that its significance is significant as a method for manufacturing a heat insulating panel. In the present invention, a thickener, an antiaging agent, a pH adjusting agent, a surfactant-based penetrant, a bulking agent, a flame retardant, a defoaming agent, a leveling agent, as long as the adhesive performance is not impaired in the adhesive. You may mix and use etc.
The present invention will be described below with reference to Production Examples, Examples and Comparative Examples, but the invention is not limited thereto. In the examples, parts or% are by weight unless otherwise specified.

Production Examples 1-7 (Adhesive SBR) 0.1 parts of sodium dodecylbenzene sulfonate were added to an autoclave kettle in the same manner as a usual synthetic rubber latex production method.
Charge 50 parts of distilled water and purge with nitrogen gas at 70 ° C.
After the temperature was raised to 0.5, 0.5 part of potassium persulfate was charged, and then 1/100 part of the monomer prepared in advance, which was composed of the monomer and the molecular weight modifier (t-dodecyl mercaptan) shown in Table 1, was charged, and the mixture was reacted for 30 minutes for adhesion. Seed particles of a sex SBR were formed. Then, the remaining mixed monomer excluding butadiene was gradually added to a mixed solution of 50 parts of distilled water and 1.0 part of sodium dodecylbenzenesulfonate with stirring to form a pre-emulsified monomer together with butadiene over 8 hours. Continuously charge, react the residual monomer for about 8 hours, cool to 40 ° C. or lower after the reaction, adjust to pH 7 to 8 with ammonia water, etc., and filter with a 300 mesh wire net, solid content 50%, viscosity Adhesive S of 150 cps
I got BR. 100 parts of this tacky SBR, 24 parts of Primal ASE60 (manufactured by Nippon Acrylic Chemical Co., Ltd., polyacrylic acid emulsion type thickener), 2 parts, 30% Wing Stee L (manufactured by Goodyear Co., emulsion of cresol anti-aging agent) Add 0.2 parts, viscosity 5000 cps
Of the thickened product.

[0013]

[Table 1]

Examples 1 to 10 100 parts of the mixture of the thickener and the antiaging agent for the tacky SBR obtained in Production Examples 1 to 4 were taken, and while stirring, the CR and the cup in the proportions shown in Table 2 were used. The ring agent was stirred and mixed, and the pH was readjusted to 10 with aqueous ammonia to obtain the adhesive used in the present invention. As CR, Denka chloroprene latex LA-50 manufactured by Denki Kagaku Kogyo Co., Ltd. was used. The coupling agent is Shin-Etsu Chemical Co., Ltd., trade name KBM-40
3 (γ-glycidoxypropyltrimethoxysilane) was used. This adhesive is cut into 10 cm square pieces and 10 is applied to the back surface of the vinyl chloride steel plate (the surface coated with epoxy paint).
When the water content in the adhesive shown in Table 2 was reached, the solution was uniformly coated with a 0 g / m ² applicator and immediately dried with a ket type moisture meter equipped with a far infrared heater whose surface temperature was adjusted to 130 ° C. Then, rock wool (manufactured by Nitto Boseki Co., Ltd., 9 mm thick rock wool board) cut into 5 cm squares was adhered, pressed with a weight of 10 kg for 5 seconds, and subjected to the following evaluation test.

Evaluation test 1) Initial adhesive strength Rock wool was peeled off with a fingertip immediately after pressing, and the adhesive-coated surface was observed, and the rate of residual rock wool per area (25 cm ² ) was displayed, and the result Is shown in Table 3. (Indication that the material breakage rate is large indicates that the initial adhesive strength is excellent.) 2) Normal adhesive strength Immediately after pressure bonding, a plane tensioning jig is attached, and the adhesive is kept at room temperature for 24 hours.
After standing for a period of time, measure the adhesive strength with a Kenken-type plane tensile tester,
The adhesive strength per Kg / cm ² and the rock wool material breakage ratio are shown, and the results are shown in Table 3. 3) Heat-resistant adhesive strength The sample for measuring the normal-state adhesive strength is placed in an 80 ° C constant temperature bath for 2 minutes.
After leaving for 4 hours, immediately after taking out, the adhesive strength was measured in the same manner as the normal adhesive strength measurement, and the results are shown in Table 3. 4) Durability After irradiating the PVC steel sheet side with a weatherometer for 1000 hours,
The adhesive strength was measured in the same manner as the normal adhesive strength, and the results are shown in Table 3.

Comparative Examples 1 to 5 Adhesives were prepared in the same manner as in Examples with the ratio of the tacky SBR obtained in Production Example 1 shown in Table 2, and they were bonded when the water content shown in Table 2 below was reached. The thing was used for the test similar to an Example, and the result is shown in Table 3. Comparative Example 6 The adhesive of the styrene-butadiene copolymer latex obtained in Production Example 5 was adjusted in the same manner as in Example 1, and the same test as in Example 1 was performed. The results are shown in Table 3. Comparative Example 7 The adhesive SBR obtained in Production Example 6 was subjected to the same test as in Example 1 after adjusting the adhesive as in Example 1, and the results are shown in Table 3. Comparative Example 8 The adhesive SBR obtained in Production Example 7 was subjected to the same test as in Example 1 by adjusting the adhesive as in Example 1, and the results are shown in Table 3.

[0017]

[Table 2]

[0018]

[Table 3]

[0019]

As is apparent from the evaluation results of Table 3, in the method for producing a heat insulating panel of the present invention, since the solvent is water, the fire and the adverse effect on the human body due to the organic solvent are extremely low. Since it can be adhered, the effect of improving productivity is extremely large, and the adhesive strength, heat resistance, and durability are excellent, its significance is significant as a method for manufacturing a heat insulating panel. Based on this evaluation result, after applying an adhesive agent to a steel plate using an endless winding plate, mechanically supplying a heat insulating material that has been cut into a predetermined size by passing through a drying facility and roll-pressing it If the equipment for cutting to a predetermined size is prepared, it is possible to make a fully integrated production line, the productivity is further improved, and the practicality is extremely high.

Claims (3)

[Claims] 1. A styrene-butadiene-acrylic acid ester copolymer latex having a glass transition temperature of -20 to -5 ° C. and a gel content of 20 to 60% by weight, and a chloroprene latex and glycidyl having a high crystallization rate. A heat-insulating panel characterized by applying an adhesive containing a silane coupling agent to a metal plate, scattering water with a far-infrared heater, and adhering heat-insulating material when the adhesive layer becomes translucent Manufacturing method. 2. A solid content of chloroprene latex having a high crystallization rate is 5 to 50 parts by weight, and a glycidyl silane is based on 100 parts by weight of the solid content of the adhesive styrene-butadiene-acrylic acid ester copolymer latex. The method for producing a heat insulating panel according to claim 1, wherein the coupling agent is blended in an amount of 0.05 to 2 parts by weight. 3. The water content of the translucent adhesive layer is 5 to 2
The method for producing an insulating panel according to claim 1, wherein the content is in the range of 0% by weight.