JP3051438U - Thermosetting high foaming sealing material block - Google Patents

Abstract

(57) [Summary] (Modifications) [PROBLEMS] A thermosetting type used in a hollow body of a vehicle body structural member, which is vulcanized and hardened by heating and foams to fill and seal the hollow body. In foam sealing materials, good yield, excellent workability, depending on the application,
Provided is a box-shaped or column-shaped or mixed shape thereof, which provides a structure having improved structural strength, excellent soundproofing, vibration-proofing, and heat-insulating properties. SOLUTION: A thermosetting high foaming sealing material is box-shaped.
It is filled in a container that has been subjected to a mold release treatment in the form of a cylinder or a mixture thereof , and the container is deformed so that removal is easy.
A seal material block characterized by being easy to use .

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermosetting high-foaming sealing material which is vulcanized or cured by heating and foams to fill and seal a hollow body. The thermosetting high-foaming sealing material of the present invention is used, for example, when filling the inside of a center pillar of an automobile to prevent generation of wind noise.

[0002]

2. Description of the Related Art Some automobiles, home electric appliances, industrial machines and the like have hollow parts made of thin plate members to reduce the weight of the products. Examples of such hollow body parts include doors, roofs, fenders, trunks and the like of automobiles and various pipes. However, products such as automobiles are required to have a certain level of structural strength, soundproofing, vibration-proofing, and heat-insulating properties from the viewpoint of safety and comfort. For this reason, a thermosetting high-foaming sealing material (hereinafter, abbreviated as “sealing material”) is used in the hollow body parts and the like.

[0003] For example, a method of injecting and filling a liquid composition such as a urethane-based two-component curable foamable resin composition into a hollow body and foaming the same, and filling a bag-like body with a liquid thermosetting foaming liquid in advance. And a method in which a thermosetting granular material is thermally fused in a hollow body, and Japanese Patent Application Laid-Open No. 62-62882 discloses a sheet in which a composition containing an unvulcanized rubber as a main component is coated on release paper. There is a disclosure of a seal material in a shape. This sheet-shaped sealing material is adhered to one of a pair of opposing surfaces constituting a hollow body and heated at 140 to 170 ° C. Thereby, it is vulcanized and foamed, and the hollow body is filled. The expansion ratio of various sealing materials is generally about 1.3 to 1.6 times.

[0004]

[Problems to be Solved by the Invention] In the method of injecting a liquid composition, an injecting machine must be brought into a work place, so that an extra work space is required, and strict mixing control of two liquids is required. Problems, such as the need to prevent liquid leakage.

[0005] Further, the method using a granular material has a structure like a foam, but has a problem that it is difficult to sufficiently obtain soundproofing, vibration-proofing, heat-insulating properties and the like.

Further, the sheet-shaped sealing material has an advantage that it can be continuously formed into a sheet by extrusion, but there is a restriction that the cohesive force and the viscosity are required to maintain the shape for forming the sheet. . In terms of dimensions, there is considerable freedom due to cutting, but the sheet in the unfoamed stage has considerable tackiness so that release paper is required, sticks to the punching teeth when cutting, and the workability is poor. Not good. Recently, many requests for dimensions and shapes have been made by customers. In terms of thickness, it can be formed and stored stably up to about 1 mm. It is extremely difficult to make it thick. In the case of a circular or elliptical shape, it can be obtained by punching from a sheet, but the yield is extremely reduced.

[0007]

The thermosetting highly foamable sealing material of the present invention is in the form of a block filled in a container made of a plastic or the like which has been subjected to a release treatment. In use, the sealing material is taken out, inserted into a hollow body, and foamed and cured at an appropriate temperature, for example, 150 to 200 ° C.

The feature is that it can be formed into an arbitrary shape as shown in FIGS. 1 and 2 depending on the application. In recent years, the shape of the hollow body has become complicated, and in the case of automobile body structural members, instead of sealing the entire hollow body, the hollow body may be locally filled. The dimensions can be several. When a sealing material having a shape matching the shape of the hollow body is inserted into the hollow body, the foaming proceeds uniformly, providing a structure with the desired structural strength, soundproofing, vibration-proofing and heat-insulating properties. be able to.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the thickness of the container may be a molded product having a thickness of 0.2 to 1.0 mm. This makes it easier to remove the sealing material if the container is deformed. The lid of the container is made of similar material, but in consideration of workability, the outside (mainly the bottom) of the box is released without using the lid so that the container can be stacked and stored. You can also. As the material of the container, polyethylene, polypropylene, polyethylene terephthalate, or the like is used. As for the production method, it is preferable to obtain from these sheets which have been subjected to mold release treatment by vacuum molding and press molding.

A conventional composition is used as a sealing material. That is, in the case of rubber, unvulcanized rubber (100 parts by weight) (hereinafter abbreviated as "part"), vulcanizing agent (4 to 8 parts), softener (50 to 75 parts), foaming agent (4 to 8 parts) 8 parts) and an inorganic filler (5-95 parts). As the unvulcanized rubber, natural rubber and various synthetic rubbers can be used. Natural rubber (IR), styrene / butadiene rubber (SBR), butadiene rubber (BR), chloroprene rubber (CR), butyl rubber (IIR) ), Ethylene-propylene rubber (EPM, EPDM), chlorosulfonated polyethylene and the like. Since these rubbers have a good affinity for oil, even when applied to a steel plate to which oil is attached, the adhesive force does not decrease much. The vulcanizing agent preferably functions when heated and does not function at room temperature. For example, it is preferable to use a mixture of a vulcanizing agent composed of a sulfur compound and a vulcanization accelerator such as a thiazole compound. Such a mixture does not react at room temperature, but reacts when heated to 140 to 170 ° C. to generate sulfur and vulcanize the unvulcanized rubber. As the softener, conventionally known softeners such as mineral oil and seed oil can be used. As the blowing agent, one that decomposes in the same temperature range as the above vulcanizing agent to generate gas is used, and examples thereof include azodicarbonamide and dinitrosopentamethylenetetramine. The inorganic filler mainly functions as a bulking agent, and calcium carbonate, quartzite powder, barium sulfate, ferrite and the like can be used in the same manner as before.

In the case of a thermosetting resin, thermosetting resin (100 parts), curing agent (3 to 10 parts), foaming agent (2 to 8 parts), inorganic filler (0 to 30 parts), etc. Is used as a main component, and an unvulcanized rubber, a thixotropy-imparting agent and the like are appropriately blended. Examples of the thermosetting resin include various epoxy resins and modified epoxy resins thereof, melamine-based resins, polyester-based resins, phenol-based resins, urea-based resins, and the like. These may be used alone or in combination of two or more. Among these, the above-mentioned epoxy resin and its modified epoxy resin which are excellent in adhesion to metal are preferable. A heat-activated curing agent (hereinafter, referred to as a “curing agent”) that exerts a curing action by heating (80 to 200 ° C.) is generally blended with the thermosetting resin. Examples of the curing agent include dicyandiamide, 4,4'-diaminodiphenylsulfone, phenol, various acids or acid anhydrides, and polyamides as curing agents for epoxy resins. Then, a curing accelerator may be blended with the thermosetting resin. As the curing accelerator component, an imidazole derivative such as 2-n-heptadecyl imidazole, isophthalic acid or adipic dihydrazide, a guanidine-based, N, N-dialkylthiourea derivative and the like are used. As the foaming agent, the same material as in the case of the rubber system is used.

The above composition is made uniform using a mixer such as a heating mixer or a kneader. The temperature at this time varies depending on the composition, but is 100 ° C. or lower, preferably 80 ° C. or lower in order to suppress the progress of vulcanization or curing and to suppress the decomposition of the foaming agent. After the completion of mixing, the viscosity is adjusted so as to form a fluid putty, and the mixture is immediately poured into a container. When cooled to room temperature, a clay-like sealant with some cohesive strength is obtained. The obtained sealing material is taken out of the container, inserted into a hollow body, and heated to 150 to 200 ° C., whereby a structure having excellent structural strength, sound insulation, vibration insulation, and heat insulation can be obtained. . The specific gravity of the sealing material before foaming is 1.0 to 1.5, and is about 0.3 to 0.8 after foaming.

Next, examples will be described together with comparative examples.

[0014]

Example 1 100 parts of SBR as unvulcanized rubber, 5 parts of tetramethylthiuram disulfide as a vulcanizing agent, 70 parts of an aromatic oil as a softening agent, 5 parts of a hydrazide blowing agent as a blowing agent, and calcium carbonate 85 as an inorganic filler Department. These were made into a uniform composition using a mixer or kneader, and heated to 80 ° C. in a mixing pot. Immediately after that, it was poured into a box-shaped polypropylene container having a thickness of 0.5 mm, a depth of 25 mm, a width of 50 mm, and a length of 100 mm vacuum-molded into a predetermined shape so as to have a thickness of 20 mm. Product was obtained.

[0015]

Example 2 100 parts of a bisphenol A epoxy resin as a thermosetting resin, 5 parts of dicyandiamide as a curing agent, 5 parts of a hydrazide blowing agent as a blowing agent, 25 parts of calcium carbonate as an inorganic filler, and as an unvulcanized rubber 15 parts of NBR and 10 parts of organic bentonite as a thixotropic agent were used. A molded product was obtained in the same manner as in Example 1.

[0016]

Comparative Example 1 The same composition as in Example 1 was mixed uniformly using a mixer or kneader, and then pressed to a thickness of 20 mm through release paper to form a sheet. . This sheet was punched into a predetermined shape similar to that of Example 1 to obtain a molded product.

[0017]

Comparative Example 2 A molded article was obtained in the same manner as in Comparative Example 2, except that the same composition as in Example 2 was used.

The moldability of each of Examples 1 and 2 and Comparative Examples 1 and 2 was tested. In addition, the said test was performed by the method shown below.

[Moldability] Here, the moldability refers to the dimensional accuracy of a molded article with respect to a predetermined shape. Examples 1 and 2 were visually observed after being taken out of the container. In Comparative Examples 1 and 2, punching was performed, the release paper was removed, and then visual observation was performed.

All of the examples were molded articles having a predetermined shape. On the other hand, all the comparative samples adhered to the punched teeth during the punching process, and were difficult to process, and a molded product having a predetermined shape could not be obtained.

[0021]

As described above, the thermosetting highly foamable sealing material of the present invention can provide the sealing material in any shape and size according to the structure of the hollow body.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a thermosetting highly foamable sealing material block of the present invention.

FIG. 2 is a plan view showing an example of the shape of the thermosetting highly foamable sealing material block of the present invention.

[Explanation of symbols]

 1 plastic container 2 lid 3 thermosetting high foaming sealing material

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[Procedure amendment]

[Submission date] February 27, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI C09K 3/10 C09K 3/10 Z B29C 67/22 // B29K 105: 04

Claims (1)

[Utility model registration claims] 1. A sealing material block obtained by filling a thermosetting high-foaming sealing material into a release-treated container.