KR100288762B1 - Metallic plate reinforcement foam composition - Google Patents

Abstract

PURPOSE: Provided is a metallic plate reinforcement foam composition which is excellent in workability, has a better vibration-proofing effect than existing nonfoaming reinforcement(damper), is reduced in costs, and minimize an increasing of vehicle's weight. CONSTITUTION: The foam composition is produced by adding a tackifying agent to polyvinyl chloride(PVC) resin and calcium carbonate as a filler. The tackifying agent is produced by adding mixed plasticizer consisting of selectively mixed DOC, DOA and DINP to a copolymerized resin of vinyl acetate and vinyl chloride monomer. The composition further comprises 5-15 wt.% of NBR modified epoxy resin and 5-25 wt.% of bisphenol An epoxy resin, as both an adhesive and a reinforcement, 0.1-5 wt.% of K-Zn mixture as a heat stabilizer, 0.2-2 wt.% of carbon black as a colorant and a reinforcement and a conducting agent, 1.5-5 wt.% of foaming agent, 0.3-4 wt.% of foaming aids and 0.1-3 wt.% of dicyandiamide as a potential hardener.

Description

Foamed Metal Plate Reinforcement Composition

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to metal sheet reinforcement compositions such as foamed automotive panels, and more particularly to foamed metal sheet reinforcements that can be applied to metal plates such as doors, roofs and side panels of automobile bodies. It is about.

Conventionally, there has been a metal plate reinforcing agent having a butyl rubber-based dustproof (dust damping) and soundproofing function, which is mainly composed of rubber. However, such a reinforcing agent has a low reinforcing effect and naturally deteriorates when the reinforcing agent is applied to the metal plate for a long time. The present invention has a disadvantage in that dustproofing and soundproofing are deteriorated. Accordingly, the present inventors have improved the defects of the conventional metal reinforcing agent as described above, and in the applicant's patent application No. 56756, the main agent of PVC is mixed with a tackifier and a filler. Method of manufacturing metal plate reinforcement and metal surface reinforcement method by the reinforcing agent ”, but the metal plate reinforcing agent is non-foaming type, and when cured, the panel of the car shrinks and deforms due to shrinkage reaction of epoxy resin. (Dent) there was a defect that causes, in addition to the asphalt-based vibration damper, or reinforcing agent, Since only it has any one of the intrinsic features because the itneundeda a limit on the application in this case to be the thickness of the reinforcing agent had the disadvantage that the vehicle weight increased.

The present invention is a conventional non-foamed metal sheet reinforcement, butyl rubber-based reinforcing agent (vibration damper) or asphalt-based reinforcement applied to metal plates such as doors, roofs, side panels, etc. of automobiles as described above. It can be applied to the bent part of the body metal plate by supplementing and improving the defects such as vibration damping agent. This is an example of providing a foamed metal sheet reinforcing agent that has excellent workability and cost, and is more dustproof than a conventional non-foaming type reinforcing agent (dust damper) and minimizes an increase in vehicle weight. It will be described in detail as follows.

1 is a cross-sectional view of the foamed metal sheet reinforcing sheet of the present invention.

* Explanation of symbols for main parts of the drawings

1: Restriction agent 2: Composition sheet

3: release paper

A copolymer of dioctylphthalate (DOP) and dioctyl adipate (DOA), or a mixture of dioctylphthalate (DOA), a copolymer of polyvinyl chloride resin (PVC), a foaming resin, and a vinyl chloride monomer, which is adhesive to calcium carbonate, a filler. A metal sheet reinforcing agent comprising the addition of a tackifier added by mixing with a mixed plasticizer selected from a mixture of hydrated soybean oil or a mixed plasticizer consisting of a mixture of diisononyl phthalate (DINP) and any one of DOP or DOA. NBR (Nitril Butadiene Rubber) modified epoxy resin (preferably epoxy equivalent of 280) and bisphenol A type epoxy resin (preferably epoxy equivalent of 184) as an adhesive and a reinforcing agent in the composition 5-25 wt%, 0.1-5 wt% K-Zn mixture as heat stabilizer, 0.2-2 wt% carbon black as colorant, reinforcing agent and conductive material, azodicarbonamide as blowing agent ( Azodicarbonamide), N, N'-Dinitrosopentamethylenetetramine (NN'-Dinitrosopentamethylene-tetramine), P, P'-Oxybisbenzensulfonylhydrazide and P-toluenesulfonylhydrazide One or two or more selected from (P-Toluenesulfonylhydrazide) 1.5-5 wt%, one or two selected from Zno, Zn-St mixture, Pb-St mixture, Ca-St mixture and Urea resin as foaming aid It is composed of 0.3 to 4 wt% of paper and 0.1 to 3 wt% of dicyandiamide as a latent curing agent.

In the above, PVC, tackifiers and fillers are as already described in the above-mentioned prior patent of the present applicant, preferably 5 to 25 wt% of PVC, 17-50 wt% of filler, tackifier 3 -8 wt% is preferred.

In order to apply the composition to a vehicle body metal plate, etc., the composition components are added and mixed in order to form a compound composition in a kneader or a horizontal mixer, and then unfolded in a sheet metal or glass wool to a certain thickness to form a sheet. After that, protect the surface with a release paper and then remove and release only the release paper when attaching it to the metal plate.

This construction method is based on a technique already known in the applicant's prior patents.

When the amount of the NBR-modified epoxy resin is less than 5 wt% or more than 15 wt%, the NBR-modified epoxy resin is easily peeled off after adhesion and has a weak impact resistance.

In addition, when the bisphenol A epoxy resin is less than 5 wt%, the adhesive strength to the iron plate may be lowered. When the bisphenol A epoxy resin is more than 25 wt%, peeling and cracking may occur due to an increase in the adhesive strength.

When the amount of added carbonic carbonate filler is less than 17wt% or more than 50wt%, the volume retention and processability and adhesiveness of the final product may be lowered.

In addition, the thermal stabilizer K-Zn mixture may be less than 0.1wt% heat resistance, and if more than 5wt% adhesive strength is reduced and stability is reduced.

When the polyvinyl chloride resin is less than 5wt%, the foamability and adhesive strength are increased, but the heat resistance is lowered, so that the aging of the product occurs quickly. Also, the carbon black, which is a colorant, a reinforcement and a conductive agent, is less than 0.2wt% or 2wt%. If it is more than%, the reinforcement and conductivity may be lowered or exceeded. If the foaming agent is less than 1.5 wt%, the foaming rate may be lowered.

In addition, the foaming aid is for lowering the decomposition temperature of the blowing agent, but less than 0.3wt% may not lower the decomposition temperature of the blowing agent may cause the foaming does not occur, and if more than 4wt% may reduce the foaming rate due to the residual reactants and limit the foaming form. If the tackifier is less than 3wt%, the workability is easy to be lowered, and if it is 8wt% or more, the workability is lowered and the initial tackiness is lowered, so that it is difficult to completely attach the tackifier, and the tackifier is mixed with the copolymer resin. If the ratio of the plasticizer is 1: 2 and the ratio of the mixed plasticizer is 1: 1, it is difficult to apply the adhesive on the surface of the metal plate because the adhesive of the final product is weak or the viscosity is too strong. If the latent curing agent is less than 0.1wt%, the curing speed is slow or not to decrease the hardness and adhesive strength There is a concern, and if it exceeds 3wt%, there may be a problem that the penetration is reduced in peeling of the adhesive surface and storage stability.

Hereinafter, the operation of each of the components described above will be described.

NBR-modified epoxy resin and bisphenol-A epoxy resin provide oil adhesion, adhesive strength and impact resistance, and calcium carbonate (CaCO ₃ ) is a filler to control the volume of the final product, and the thermal stabilizer K-Zn mixture is thermally stable. And polyvinyl chloride (PVC) is foamable because it is foamed by foaming agent to increase the volume and give light weight and impact resistance (resistance) to the final product, and carbon black is colored and The reinforcement and conductivity are given simultaneously, and the foaming agent gives foamability to the PVC by heat during the heat curing process after painting the car body in the automobile production line, and the foaming aid lowers the decomposition temperature so that the foaming agent decomposes at a low temperature (about 170 ° C or less). (Usually foamed at 200 ℃ or higher), and the cohesion of the copolymerized resin of vinyl acetate monomer and vinyl chloride monomer with mixed plasticizer The imparting agent imparts the processability and tackiness of the product, and dicyanamide, a latent curing agent, is intended to prevent the penetration of the product rapidly when stored at room temperature.

EXAMPLE

4kg of vinyl acetate and vinyl chloride monomer is mixed with 8kg of mixed plasticizer by mixing 4kg of DOP and DOA, and 12kg of tackifier is added to Kneader, and carbon is added as a colorant, reinforcing agent and conductive agent. 2kg black, 20kg NBR modified epoxy resin and 30kg bisphenol A epoxy resin as adhesive and reinforcing agent, 80kg calcium carbonate as filler, 6kg K-Zn mixture as heat stabilizer, 32kg PVC resin as foamable resin, 8kg aszodicarbonamide as foaming agent, 6 kg of a Zn-St mixture as a foaming aid and 4 kg of dicyandiamide as a latent curing agent were sequentially added, followed by stirring to obtain a 200 kg metal plate reinforcement composition.

The mixing order of the above-mentioned components may be in the same order as in the constitution of the present invention, but it is preferably kneading and stirring.

As shown in FIG. 1, the metal plate reinforcing agent composition obtained above is spread on a sheet 2 of a certain thickness to a restraint material 1 such as a metal thin plate or glass wool, and the other side is a release paper 3. The sheet 2 of the composition was protected, and then the release paper 3 on one side was removed during self-deposition coating and the sheet surface was attached to the door of the car body to be reinforced. As a result of foaming during electrodeposition coating drying heated for about 15 to 40 minutes, the composition (2) of the reinforcing agent of the present invention was cured by heating and was foamed and strongly adhered to the inner surface of the vehicle door, thereby greatly affecting its own weight. It showed strong reinforcement and vibration damping effect without delamination or cracking even in strong impact or rolling without giving any effect.

Sheets made of the foamed reinforcement composition of the present invention configured as described above are used as reinforcing materials in hoods, doors, roofs, floor panels, quarter panels, etc. of automobiles. It adheres thinly and does not stop the separate heat curing process, but it is automatically bonded and foam hardened by electrodeposition coating drying heat in the electrodeposition coating drying furnace of automobiles, so it does not increase reinforcement, vibration damping effect and the weight of the car body. Due to the thinness of the steel sheet, it has the effect of cost reduction and fuel economy, and can be made in various forms, so that it can be selectively applied to any necessary part such as flat and curved parts.

In particular, the composition sheet of the present invention, unlike the existing non-foamable reinforcing agent exhibits a deflection (Dent) phenomenon in the body metal plate due to the unbalance of the bending strength at the time of heat curing, the sheet of the composition of the present invention completely eliminates such defects It is.

Claims (3)

To metal sheet reinforcement by adding polyvinyl chloride resin (PVC) and calcium carbonate as a filler, mixed plasticizer which selectively mixed DOP, DOA and DINP with copolymer resin of vinyl acetate and vinyl chloride monomer. 5-15 wt% of NBR-modified epoxy resin and 5-25 wt% of bisphenol A type epoxy resin, 0.1-5 wt% of K-Zn mixture as a heat stabilizer, a colorant, a reinforcing agent and a conductive agent A foamed metal sheet reinforcement composition comprising 0.2 to 2 wt% of carbon black, 1.5 to 5 wt% of blowing agent, 0.3 to 4 wt% of foaming aid, and 0.1 to 3 wt% of dicyandiamide as a latent curing agent. The method of claim 1, wherein the blowing agent is azodicarbonamide, N, N'-Dinitroso pentamethylenetetramine (NN'-Dinitrosopentamethylene-tetramine), P, P'-oxybisbenzenesulfonylhydrazide (PP'-Oxybisbenzensulfonylhydrazide) and P-toluenesulfonylhydrazide (P-Toluenesulfonylhydrazide) It is a foamed metal sheet reinforcing composition, characterized in that one or two or more selected from. The method of claim 1, characterized in that the foaming aid is one or two or more selected from Zno, Zn-St mixtures, Pb-St mixtures, Ca-St mixtures, Ba-St mixtures and Urea resins. Foamed metal sheet reinforcement composition.