JPH04261941A - Joint material - Google Patents

Abstract

PURPOSE:To impart fire protection property to joint material which is furnished with weather resistance and elasticity by impregnating core material made of foamed bridge forming type polyvinyl chloride which is made communicable, with fire protection agent. CONSTITUTION:Foamed organizations of joint material 1 which are formed with foamed bridge forming type polyvinyl chloride foamed at low density, for example, 3 to 10 times as low as an original density, is partially destroyed so as to be made communicable, so that hollow sections 2 are thereby formed. In addition, a skin layer 3 is formed on the outer circumferential surface of the joint material 1, so that strength and weather resistance are thereby increased. One and more kinds of fire protection agent 4 such as magnesium carbonate, aluminum hydroxide and the like is formed into a liquid state by the use of fat and oil binder, and it is filled into the hollow sections 2 so as to be hardened, so that fire protection property is thereby imparted to the joint material 1 which is furnished with weather resistance and elasticity, at low cost.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint material in which a core material made of a cross-linked polyvinyl chloride foam is impregnated with a fire retardant.

0002

[Prior art] Conventional joint materials are made by connecting synthetic rubber,
A joint material impregnated with a fire retardant or ■JP-A-5
Joint materials described in Japanese Patent Application Publication No. 4-15917, JP-A-63-191841, etc. are known.

0003

[Problems to be Solved by the Invention] However, although synthetic rubber can be made to communicate, it is difficult to fill the communication holes with a fire retardant, and rubber does not have much weather resistance. In addition, the joint material shown in item (1) above has the disadvantages of being expensive and lacking in weather resistance, since it is made by impregnating an inorganic fiber fabric with a fire retardant and covering its outer peripheral surface with a synthetic resin film. Furthermore, ■ is a silicone sponge, and although it exhibits sufficient performance, it has the drawback of being extremely expensive.

0004

[Means for Solving the Problems] In order to eliminate such drawbacks, the present invention uses a cross-linked polyvinyl chloride foam as a core material, impregnating it with a fire retardant if necessary, and providing excellent weather resistance. This project proposes a joint material that is fireproof and inexpensive.

[0005]

[Example] The joint material according to the present invention will be explained in detail below with reference to the drawings. 1 and 2 are explanatory diagrams of a joint material showing a typical example of the above invention, where 1 is a joint material, 2 is a hollow part, and 3 is a joint material.
is a skin layer, and 4 is a fire retardant.

To explain further, the joint material 1 is made by foaming a cross-linked polyvinyl chloride foam to a low density, for example, about 3 to 10 times the density, and has a hollow part 2 in which the air bubbles are communicated. This hollow portion 2 is effective for obtaining deformation and elasticity, and also has the function of storing a fire retardant to be filled as necessary. Further, there is a skin layer 3 on the surface layer of the joint material 1, which enhances strength and weather resistance. especially,
Since cross-linked foam has excellent weather resistance, this is utilized and the closed cell structure is partially destroyed to make it open.

In the present invention, the fire retardant 4 includes magnesium carbonate, aluminum hydroxide, talc, clay, silicone, mica, alumina, magnesium oxide, etc.
The seeds or more are liquefied into the hollow part 2 with an oil binder or the like, and then filled and hardened.

Next, a specific example will be explained. First, the composition of the polyvinyl chloride foam is selected as follows. PVC
100 parts by weight dioctyl adipate
20 parts by weight Butylbenzyl phthalate (plasticizer)
20 parts by weight Epoxidized linseed oil
5 parts by weight Anhydrous Trimet (crosslinking aid)
2 parts by weight tribasic lead sulfate (stabilizer)
10 parts by weight azodicarbonamide
10 parts by weight polyethylene oxide (lubricant)
2 parts by weight Zinc oxide (foaming aid)

1 part by weight Tetrapropylammonium bromide
1 part by weight Foam breaking agent (water)

1 part by weight of the above material was kneaded to give the properties of plastisol, which was filled into a cylindrical material at 1/3 of its volume, and then heated at 230°C to obtain a joint material with a foam structure about 5 times more foamed. There was a skin layer 3 on the outer peripheral surface, and 1/3 of the foamed structure was connected. Of course, there was sufficient cushioning.

Another embodiment is a joint material 1 in which fire retardant agent 4 is filled in the open-cell portion of the joint material 1 formed in this way to add fire retardant properties to the joint material 1. Furthermore, the joint material can also be formed into a communicating hollow part by physically processing the foam structure.

0010

Effects of the Invention As described above, according to the joint material according to the present invention, (1) the cross-linked vinyl chloride foam is used as the core material of the joint material, so it has excellent weather resistance. ■There are communicating holes and sufficient elasticity. ■Low cost. ■It is easy to add fire resistance. It has the following characteristics and effects.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a joint material according to the present invention.

FIG. 2 is a perspective view showing another embodiment of the joint material according to the present invention.

[Explanation of symbols]

1. Joint material 2 Hollow part 3. Skin layer 4 Fire retardant

Claims (1)

[Claims] 1. A joint material comprising: a cross-linked vinyl chloride foam; an open-cell portion is formed in at least a portion of the foam structure; and the open-cell portion is impregnated with a fire retardant.