JP4471366B2 - Panel and its manufacturing method - Google Patents

Description

  The present invention relates to a panel used for a building panel such as a truck body, various containers, and a trailer house, and a manufacturing method thereof.

Panels used in truck bodies, containers, and other walls, floors, roofs, etc. are required to have excellent heat insulation performance and light weight. Core materials such as resin foam and honeycomb materials, plywood and particles A material obtained by laminating a wooden plate material such as a boat and a hard board, a metal plate such as a steel plate, an aluminum plate and a stainless steel plate, a reinforced plastic material or a composite material of these materials is employed.

These panels are processed by injecting and foaming a resin foam material between surface materials such as steel plates, aluminum plates or composite plates, or resin foam materials between surface materials such as steel plates, aluminum plates or composite plates. Has been produced by, for example, arranging and laminating with an adhesive.
The former injection / foaming method requires a large amount of capital investment, and it requires a high level of technical know-how to inject / foam uniformly even with a large size, or it takes man-hours, or blowing agents such as Freon gas and cyan gas The latter has been increasingly used due to environmental pollution problems.

  Conventionally, an epoxy resin adhesive, a urethane resin adhesive, or the like has been used in a method in which a resin foam material is disposed between the latter surface materials and the surface material and the resin foam are bonded and laminated. However, in these cases, the cured adhesive layer is hard, so that the adhesive strength can be obtained. However, since the material of the resin foam is weak and the interlayer strength is weak, the material breaks down when a large stress is momentarily applied. Therefore, there is a problem that the adhesive layer is broken or the adhesive layer is peeled off.

On the other hand, when the panel is used as a member for truck bodies, various containers, etc., the bending stress due to the load of the loaded luggage, the pressing stress on the body of the luggage when turning left and right during operation, or the vibration during traveling Because impacts are concentrated and applied in a short time, there are problems such as breakage and peeling near the contact surface between the resin foam and the surface material, causing the panel to swell, deform, or break in severe cases. It was happening.

JP 2004-67063 A Japanese National Patent Publication No. 6-507702

In view of the above situation, the present invention is used for truck bodies, various containers, etc., and is subjected to bending stress due to the load of the loaded luggage, distortion stress due to the pressing force of the luggage when turning left and right during operation, or traveling Resin foam used as a core material due to vibration, impact, etc. at times is difficult to break in the vicinity of the joint surface with the surface material, providing a panel bonded with a flexible adhesive and its manufacturing method Is.

  In the present invention, as means for solving the above-mentioned problems, the adhesive between the resin foam used as a core material and a surface material such as a steel plate, an aluminum plate, a stainless steel plate or a plywood is excellent and flexible. By using a modified silicone resin-based adhesive having the above, the above-mentioned problems could be solved.

The panel according to the present invention is a modified silicone resin system having excellent adhesiveness and flexibility for bonding between a resin foam used as a core material and a surface material such as a steel plate, an aluminum plate, a stainless steel plate or a plywood. Adhesive is used as a structural material for truck bodies, various containers, etc., and the resin foam and surface material can be joined even when subjected to deflections due to loading load, vibration or impact during operation, etc. There is no breakage or peeling from the vicinity of the surface, and it can be used for a long time even when used under severe usage conditions such as in the middle of distribution.
In addition, if the modified silicone resin adhesive is applied to the resin foam and the surface material and laminated and pressure-bonded, the resin foam and the surface material are firmly integrated, and a panel that can withstand the severe use environment as described above Can provide.

Hereinafter, the panel according to the present invention and the manufacturing method thereof will be described in detail.
The panel according to the present invention is a modified silicone resin adhesive having a flexible resin foam used as a core material and a surface material such as a steel plate, an aluminum plate, a stainless steel plate or a plywood, which is excellent in adhesiveness. Are bonded together.

Examples of the resin foam used for the core material include polystyrene resin foam and polyurethane resin foam.
For these resin foams, extruded polystyrene specified in JIS K9511 (density 25 to 45 kg / m ³ , thermal conductivity 0.028 kcal / m · h · ° C., compressive strength 20 kgf / cm ² or more), bead method Polystyrene foam (density 20 kg / m ³ , thermal conductivity 0.040 kcal / m · h · ° C., compressive strength 20 kgf / cm ² or more), rigid urethane foam (density 20 kg / m ³ , thermal conductivity 0.24 kcal / m) H · ° C., compressive strength of 8 kgf / cm ² or more) is used. Various sizes of these resin foams are used depending on the size of the panel to be processed, and there are flat surface shapes or those provided with minute irregularities, among which 0.5 to If grooves having a width of 1 to 2 mm and a depth of 1 to 2 mm are provided in a parallel or grid pattern at an interval of 1 cm, an adhesive anchoring effect can be obtained, and the excessive application of adhesive can be prevented. This is advantageous because it can eliminate contamination of production equipment.

As the surface material, plywood, particle board, hard board and other wood-based board materials, stainless steel plates, steel plates, metal plates such as aluminum plates, reinforced plastics, synthetic resin-based plate materials such as resin plates, or composite plates in which these materials are laminated Etc. The size of these surface materials is suitable for use, for example, having a thickness of 0.3 to 20 mm and a length and width of 2300 to 6500 mm.

  The modified silicone resin-based adhesive according to the present invention includes a modified silicone resin, a dehydrating agent, a silane compound, a filler, or a liquid A containing the acrylic polymer as a plasticizer having excellent adhesion, etc. It consists of a B liquid containing a curing agent, a filler, water, or an acrylic polymer as a plasticizer that is further excellent in adhesiveness. When used, A liquid and B liquid are mixed and used It is.

  The modified silicone resin used in the present invention has a silicon-containing functional group that can be cross-linked by forming a siloxane bond, and the molecular chain is an acrylic acid alkyl ester monomer unit and / or a methacrylic acid alkyl ester monomer. A polymer having an acrylic polymer skeleton combined with body units (hereinafter abbreviated as A-type modified silicone resin) or hydrolysis capable of crosslinking by forming a siloxane bond on the A-type modified silicone resin A polyether polymer or polyester polymer (hereinafter abbreviated as B-type modified silicone resin) having a functional silicon terminal group is blended.

The blending ratio of the A-type modified silicone resin and the B-type modified silicone resin is preferably 0 to 200 parts by weight with respect to 100 parts by weight of the former.

  Examples of the curing agent for the modified silicone resin include tin compounds such as dibutyltin oxide, metal carboxylates such as lead octylate, dibutylamine-2-ethylhexoate, and amine salts. 0.1 to 10 parts by weight is blended with 100 parts by weight of the modified silicone resin.

  A dehydrating agent is blended in order to suppress curing of the modified silicone resin due to moisture. Specific examples include silane compounds such as vinyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, aminopropyltrimethoxysilane, and the like. And methyl orthoformate. The dehydrating agent is blended in an amount of 1 to 10 parts by weight with respect to 100 parts by weight of the modified silicone resin.

Examples of the silane compound to be blended to improve the adhesion to the adherend include aminoalkyl silane, epoxy alkyl silane, mercapto alkyl silane, and the like. Specific examples include aminopropyl trimethoxy silane, aminopropyl trimethoxy silane, Examples include a reaction product with vinyltrimethoxysilane, a reaction product with γ-glycidoxypropyltrimethoxysilane and polysulfide polymer, and commercially available products can be used.
The silane compound is 0.1 to 50 parts by weight, preferably 1 to 10 parts by weight, based on 100 parts by weight of the modified silicone resin.

The modified silicone resin adhesive according to the present invention is characterized in that an acrylic polymer is blended as a plasticizer having excellent adhesiveness. Various plasticizers such as polypropylene glycol, dimethyl phthalate, dibutyl phthalate, and butyl benzyl phthalate have been compared, but no plasticizer superior to the acrylic polymer was found.
The combination of the acrylic polymer and the modified silicone resin ensures adhesiveness at the joint between the resin foam and the surface material, and gives flexibility and flexibility, and is fragile and easy to break. Stress applied instantaneously in the vicinity of the surface layer of the foam can be relaxed, and peeling and fracture at the joint surface between the resin foam and the surface material can be avoided.
In this way, epoxy resin adhesive, urethane resin adhesive, etc., which has been processed by bonding the resin foam and the surface material, rupture near the joint surface when a strong rupture stress is instantaneously applied, Problems such as peeling have been solved.

  Examples of the acrylic polymer include a polyester acrylic polymer, a polyurethane acrylic polymer having a urethane bond in the molecular main chain and an acrylic double bond at both molecular ends, an acrylic acid, methacrylic acid, etc. as an etherified polymer of bisphenol A. Polyether acrylic polymer obtained by esterification reaction of acrylic unsaturated acid, epoxy acrylic polymer obtained by reacting low molecular weight epoxy resin with acrylic unsaturated acid such as acrylic acid or methacrylic acid, polyester polyol with acrylic acid Examples include oligoester acrylic polymers obtained by esterifying acrylic unsaturated acids such as methacrylic acid, and commercially available products having a molecular weight of about 1000 to 6000 are selected and used.

Among them, acrylic polymers synthesized by continuous or bulk polymerization from acrylic monomers or mixed monomers of acrylic monomers and styrene at high temperatures have a narrow molecular weight distribution range, are solvent-free and liquid, and have no odor. Therefore, those having a molecular weight of 1000 to 6000 have a low viscosity and a glass transition point of -20 ° C. or lower, so that a soft cured product is obtained and suitable for use. Specific examples include non-functional resin series of solvent-free acrylic polymer “ARUFON” manufactured by Toa Gosei Co., Ltd., OH type resin series, COOH type series, epoxy group-containing series, and the like.

These acrylic polymers are preferably blended in an amount of 20 to 80 parts by weight with respect to 100 parts by weight of the modified silicone resin.

Examples of the filler include hollow bodies such as calcium carbonate, clay, talc, kaolin, calcium silicate, mullite, silica sand, and hollow glass spheres. An average particle size in the range of 1 to 50 μm is suitable for use because it is difficult to settle and dispersibility is good.
In addition, since moisture is required for curing the modified silicone resin, when a dry filler is blended, 0.2 wt% with respect to the total blending amount when the modified silicone resin-based adhesive is blended. It is necessary to add a certain amount of water. If the filler absorbs moisture, the amount of water can be reduced in consideration of the amount of moisture absorption.

As other compounding materials, coloring antioxidants to prevent deterioration over time and deterioration under heating temperature due to sunlight, antifungal agents to prevent wrinkles generated on the adhesive surface, and adhesives If necessary, an anti-settling agent for preventing settling of pigments, fillers and the like is added to the A liquid or the B liquid.

The adhesive composition according to the present invention can be applied by an automatic coating machine such as roll coating, nozzle coating or curtain coating, or by manual coating with a scissors. The suitable viscosity in the former is 23 ° C. 5 to 50 Pa · s, suitable viscosity in the latter is in the range of 5 to 100 Pa · s at 23 ° C.
Example

Hereinafter, it demonstrates in detail by an Example and a comparative example. The weight part is simply displayed as a part.
Examples 1-6
MA-440A (manufactured by Kaneka Chemical Co., Ltd., viscosity 70 Pa · s / 23 ° C.) as type A modified silicone resin, and EST 270 (manufactured by Kaneka Chemical Co., Ltd., viscosity 16 Pa · s / 25 ° C.) as B type modified silicone resin. ), UP-1021 (manufactured by Toagosei Co., Ltd., viscosity 400 mPa · s / 25 ° C., Tg—71 ° C.) as an acrylic polymer having a molecular weight of 1600, UP-1000 (manufactured by Toagosei Co., Ltd.) Viscosity 1000 mPa · s / 25 ° C., Tg −77 ° C.) A-1120 (manufactured by Nihon Unicar Co., Ltd.) as an amino silane compound, vinyltrimethoxysilane (VTMS) as a dehydrating agent, and an average particle size of 5 μm as a filler Liquid A containing mixed calcium carbonate and U-220 (Nitto as a modified silicone resin curing agent (Made by Kasei Co., Ltd.) and the B liquid which mix | blended the dry calcium carbonate with an average particle diameter of 5 micrometers as a filler were mix | blended, and the modified silicone resin adhesive of Examples 1-6 was prepared.
Using this, the adhesive surface of the aluminum material bent into an L shape with a thickness of 0.8 mm (adhesive surface / length 220 mm, width 40 mm, vertical portion / width 40 mm, height 80 mm), and 40 mm thickness at an interval of 10 mm Table 1 shows the results of measuring the T-peeling strength of three types of styrofoam (Dow Processing Co., Ltd.) provided with concave grooves each having a width and depth of 1 mm in parallel, and cured by the following adhesion method. It was street.

Comparative Examples 1 and 2
Epoxy resin adhesive E-5372 (manufactured by Aika Kogyo Co., Ltd.) blended with a base agent and a curing agent in a weight ratio of 1: 1, and urethane resin adhesive product number RT-16 (manufactured by NSC Japan). Table 1 shows the results of measuring the T-peeling strength of those obtained by blending the base agent and the curing agent in a weight ratio of 1: 1 and bonding and curing in the same manner as described above.

＊１：剥離変位２０ｍｍ〜４０ｍｍの平均剥離強度（ｋｇｆ）
＊２：剥離変位０ｍｍ〜４０ｍｍの剥離エネルギー
Ｂｆ：スタイロフォーム材料破壊、Ｃｆ：接着剤凝集破壊、Ｂｆ／Ｃｆ：スタイロフォーム材料破壊と接着剤凝集破壊の混在状態

* 1: Average peel strength (kgf) with a peel displacement of 20 mm to 40 mm
* 2: Peeling energy of peeling displacement 0 mm to 40 mm Bf: Styrofoam material destruction, Cf: Adhesive cohesive failure, Bf / Cf: Styrofoam material destruction and adhesive cohesive failure

Test / evaluation method (1) Adhesion, test method: 40 mm-thick three-type styrofoam (Dow Processing Co., Ltd.) certified by JIS K9511 is provided with grooves each having a width and depth of 1 mm in parallel at intervals of 10 mm. The surface of the core made of resin foam and the horizontal adhesive surface of aluminum material bent into an L shape (horizontal adhesive surface / vertical 220 mm, horizontal 40 mm, vertical portion / width 40 mm, height 80 mm) with a thickness of 0.8 mm The adhesive compositions of Examples and Comparative Examples were applied to both sides with 500 g / m ² , pressed (0.02 Mpa for 12 hours) and cured for 7 days to prepare test specimens. Is fixed horizontally to the Instron Japan tensile tester, and then the vertical part of the aluminum plate is pulled up in the vertical direction of the three styrofoams at a speed of 50 mm / min. The average peel strength of 0Mm～40mm, measuring the average peel energy of the release displacement 0～40Mm.
(2) Peeling displacement 20 mm to 40 mm average peel strength (kgf): The displacement moved vertically from the position before peeling when the vertical part of the aluminum plate was pulled up in the vertical direction of the three styrofoams was 20 to 40 mm. Average peel strength between (kgf)
(3) Maximum peel strength: Maximum peel strength when the vertical part of the aluminum plate is pulled up in the vertical direction of the three types of styrofoam (kgf)
(4) Average peeling energy of peeling displacement of 0 mm to 40 mm: The displacement moved vertically from the position before peeling when the vertical part of the aluminum plate is pulled up in the vertical direction of the three kinds of styrofoam is between 0 and 40 mm. The product of displacement (mm) and peel strength (kg) is defined as the average peel energy.

Since the panel according to the present invention is laminated and integrated using a modified silicone resin adhesive having excellent adhesion and flexibility on the adhesive surface between the surface material and the core material made of resin foam. Even if stress is momentarily applied due to distortion, bending, vibration, impact, etc., it does not break or peel off from the surface layer of the resin foam used for the core material and has excellent durability. It is useful for applications such as various containers, especially cold storage.

Claims (6)

A panel characterized in that a surface material and a core material made of a resin foam are bonded with a modified silicone resin-based adhesive containing an acrylic polymer . The panel according to claim 1 , wherein the molecular weight of the acrylic polymer is 1000 to 6000. 3. The panel according to claim 1, wherein the resin foam is a polystyrene resin foam or a polyurethane resin foam. A method for producing a panel, wherein a surface material and a core material made of a resin foam are bonded with a modified silicone resin adhesive containing an acrylic polymer . The method for producing a panel according to claim 4 , wherein the acrylic polymer has a molecular weight of 1000 to 6000. 6. The method for producing a panel according to claim 4, wherein the resin foam is a polystyrene resin foam or a polyurethane resin foam .