JPS60229979A - Magnetic sealer - Google Patents

Abstract

PURPOSE:A magnetic sealer that is obtained by using polyolefin polyol of low molecular weight, a softening agent with good compatibility, polyisocyanate, a catalyst and a magnetic substance, curing the composition and magnetizing it, thus being suitable for use to prevent liquid or gas from coming in from outside. CONSTITUTION:A polyolefin polyol of low molecular weight is mixed with a softening agent of paraffinic process oil which is highly compatible to the polyol, in a large amount, further a curing agent of a polyisocyanate such as 4,4'- diphenylmethane diisocyanate and a catalyst of tin octylate. At the same time, a magnetic substance such as barium ferrite is dispersed in the above-stated composition. Then, the composition is cured and magnetized to give the objective sealer. The above-mentioned softening agent is a petroleum oil and 100pts.wt. of the polyol is preferably mixed with 500-1,200pts.wt. of the petroleum oil.

Description

[Detailed Description of the Invention] Purpose of the Invention [Field of Industrial Application] This invention is designed to fill the joints of automobiles, the joints of structures, and the gaps between joints to prevent liquids, gases, noise, etc. from entering the exterior. It relates to a sealer that prevents intrusion from or leakage from the inside; ; JI L, < relates to a sealer made of synthetic resin that has been given magnetism.

[Prior Art] There are various types of conventional sealers, such as polysulfuric acid sealers, silicone sealers, polyurethane sealers, acrylic sealers, butyl rubber sealers, and styrene butadiene rubber (SBR) sealers.

However, all of these sealers were attached to the gaps such as the joint portions described in (-) only by the contact force of the constituent materials of the sealers. Therefore, if the adhesion of #4 material F1 deteriorates due to aging or environmental deterioration, peeling may occur, resulting in poor sealing performance, or the sealer may separate from the gap.
[Problems to be Solved by the Invention] As mentioned above, this invention has a problem in that the adhesive properties of the sealer deteriorate due to deterioration over time or environmental deterioration of the constituent materials, and the sealing performance decreases. This was done in order to solve the problem of the sealer falling off from the gap, and the purpose was to create a new product that would not fall onto the area where it is used and would not cause the sealer to fall out of the gap. Our purpose is to provide magnetic sealers.

Structure of the Invention [Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention involves making a low molecular weight polyolefin polyol compatible with the polyol, and then reactively curing and magnetizing the mixture. I adopted this method.

[Function] By blending and reaction-curing a catalyst, appropriate softness, elasticity, and viscosity as a sealer are imparted, and magnetism is further imparted by dispersing a magnetic material and making it lff1.

[Example 1 Hereinafter, embodiments embodying this invention will be described.

In this example, Polytail H, a product of Mitsubishi Chemical Industries, Ltd. (Polytail is a registered trademark of the same company), was used as the main material, a low-molecular polyolefin polyol. Low molecular weight polyolefin polyol is a polyhydroxy polymer with a molecular weight of 111,000 to 5,000, which has a hydrocarbon molecular structure similar to that of polyolefin and has a highly reactive hydroxyl group at the end, and Polytail H is a waxy solid at room temperature. (Edited in the magazine Industrial Materials, Vol. 29, No. 12 and Vol. 30, No. 1, published by Nikkan Kogyo Shimbun).

Each material was blended into this low molecular weight polyolefin polyol in the following weight parts.

Low molecular weight polyolefin polyol 100 Softener (paraffinic process oil) 800MDI 14.4 Touch *<tin octylate) 0.1 Magnetic material (barium ferrite) 520 Here, the low molecular weight polyolefin polyol is a plasticizer, petroleum oil,
Extremely high compatibility with vegetable oils, higher alcohols, unsaturated fatty acids, etc.

Therefore, paraffinic process oil, which is one type of petroleum oil, is completely compatible with low molecular weight polyolefin polyol even if it is added in a large amount as described above. Therefore, the liquid paraffin-based process oil acts as a softening agent and makes the magnetic sealer appropriately soft.

In addition, low molecular weight polyolefin polyols are not available in the above-mentioned MD
I is 4°4' diphenylmethane diisocyanate, which is one of the polyisocyanates, and acts as a curing agent for the low molecular weight polyolefin polyol as described above. M
The compounding material [)I has a compounding ratio with the low molecular weight polyolefin polyol such that the N CO/OH equivalent ratio is 1.1. Tin octylate is a catalyst for promoting the above urethane reaction.

In addition, powdered barium ferrite, which is a magnetic substance, was used and dispersed in the compound.

In order to form a magnetic sealer from the above-mentioned compounded materials, first, other compounded ingredients except the curing agent MDI and the catalyst are added to the low molecular weight polyolefin polyol, and the mixture is thoroughly kneaded using a kneader or other propeller type stirrer.

At this time, the paraffinic process oil is compatible with the low molecular weight polyolefin polyol, and the barium ferrite is almost uniformly dispersed. In this case, it is preferable to perform vacuum defoaming during mixing, but defoaming may be performed afterwards. Furthermore, curing agent M1)1 and a catalyst are added and kneaded. Subsequently, this mixture is heated to, for example, 150° C. and held for 30 minutes to cause the above-mentioned urethane reaction and cure the low molecular weight polyolefin polyol.

Next, if necessary, a strong magnetic field may be applied to the magnetic sealer to magnetize the barium ferrite.

This magnetic sealer is a very soft viscoelastic body with excellent adhesiveness, adhesion and elasticity, and is suitable as a sealer.

In addition, the magnetized magnetic sealer attracts magnetic materials such as iron and has a magnetic force that is more than enough to support its own weight, so it has a strong attachment force to the part where it is used. Further, even if the constituent materials of the sealer undergo deterioration over time or environmental deterioration, the presence of the magnetic force prevents the sealing performance from deteriorating and the sealer from moving out of the gap. The direction of magnetization is not limited, and polarity can be provided in any direction. In general, barium ferrite not only disperses and strengthens the sealer, but also improves the effectiveness of electromagnetic shielding.

Further, since low molecular weight polyolefin polyols and process oils are inexpensive, especially the latter, which is often added, the magnetic sealer of this example can be formed at a very low cost.

Next, the application of this embodiment will be illustrated. In addition to being used as a base material for magnetized magnetic sealers, the unmagnetized magnetic sealer can be used as an electromagnetic shielding sealer, a damping material, and the like. Magnetized magnetic sealers can be used as sealers for various objects that are attached to magnetic materials such as iron, such as sealers for automobile weather strips, hose joints, and other joints, joints of 1MTi objects, etc. It has a wide range of uses, including as a sealer for joints.

An example of a sealer for weather stripping will be described with reference to the drawings. Reference numeral 1 denotes the edge of a body opening in a window portion of an automobile, and has an end surface 2, and a flange 3 is protruded from the outer edge of the edge. 4 is E attached to flange 3
A weather strip (window frame rubber) made of PDM is attached to the body opening edge 1 by a clamping portion 5 of a flange 3 and a pressing lip 6 that presses the outer surface of the body.

7 is applied to the body of weather strip 4)! This is a protrusion that is integrally provided on the contact surface side and is pressed into contact with the end surface 2. Reference numeral 8 denotes a magnetic sealer injected between the end surface 2 and the abutment surface q of the weatherstrip 4, which is made of the magnetized magnetic sealer of the previous embodiment.

Since the magnetic sealer 8 is attracted to the end surface 2 by magnetic force,
Sealing performance is improved and the above effects are achieved. Moreover, since the magnetic sealer 8 is mainly made of a low molecular weight polyolefin polyol, it has good affinity for the goose strip 4 made of EPDM, and its adhesion is particularly high.

It should be noted that the present invention is not limited to the configuration of the above-mentioned embodiment, and can be implemented by making arbitrary changes, for example, as follows.

(1) The blending amount of paraffin-based process oil as a softener is 500 to 1200 parts by weight per 100 parts by weight of low molecular weight polyolefin polyol when used for each of the above applications.
It is practically desirable that the content be within the range of parts by weight. ”Here, the blending amount of paraffin-based process oil is 500%.
As the weight part decreases, the magnetic sealer gradually becomes harder. On the other hand, when the blending amount of paraffin-based process oil is 1200 or more, the magnetic sealer becomes a viscous fluid with little elasticity.

Of course, the blending amount of the paraffinic process oil is not limited to the above blending range, and can be arbitrarily determined depending on the application, the part used, the usage conditions, etc.

(2) As the softener, in addition to the above-mentioned paraffin-based process oil, various materials that are highly compatible with the low-molecular-weight monopolyolefin polyA-ol can be used. For example, other petroleum-based oils such as 71% process oil and naphthenic process oil, plasticizers such as L-phthalate (DOP) and azelaic acid ester (DO
Z), vegetable oils such as cottonseed oil, soybean oil, and safflower oil,
In addition, higher alcohols, unsaturated fatty acids, etc. may be used.

The blending amount is not limited as described above.

(3) In addition to the above-mentioned MDI, tolylene di-sardine cyanoate (TD
Various polyisocyanates such as I), xylylene diisocyanate (XDI), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HMDI) or prepolymers thereof can be used. The blending amount is preferably such that the NGO10H equivalent ratio with the low molecular weight polyolefin polyol is 0.8 to 1.degree.2.However, depending on the curing process, the blending amount may be other than the above.

(4) As the magnetic material, powder or granular materials of various magnetic materials such as magnetite can be used in addition to barium ferrite, and the particle size thereof is not limited. Further, the amount of the magnetic material to be blended is not particularly limited, and can be arbitrarily set depending on the required magnetic properties.

In addition, in the case of the above-mentioned example, it is practically desirable that the amount of the magnetic material be 50 parts by weight or more per 100 parts by weight of the low molecular weight polyolefin polyol.

(5) As a catalyst for the urethane reaction, other than tin octylate, a normal urethane reaction catalyst such as dibutyltin dilaurate may be used. The amount of this catalyst blended can be arbitrarily changed depending on the rate of the urethane reaction.

(6) Furthermore, in addition to the above formulations, reinforcing agents such as carbon black and silica, and fillers such as calcium carbonate may be incorporated as necessary. Also, if you require more stickiness,
A tackifier such as coumaron resin can also be blended.

Effects of the Invention As detailed above, the present invention has a strong adhesion force to the part where it is used, and even if the constituent materials of the sealer deteriorate over time or are degraded by the environment, the resealer whose sealing performance has deteriorated will not separate from the gap. It has the excellent effect of not causing any damage.

[Brief explanation of the drawing]

The figure is a sectional view showing an automobile weather strip, which is one application of an embodiment embodying the present invention. Magnetic Sealer 8゜Patent Applicant: Toyoda Gosei Co., Ltd. Daisanhito Bentoshi: On EB Hironobu

Claims (1)

[Claims] 1. A large amount of a softener that is compatible with the low molecular weight polyolefin polyol is blended with the polyolefin polyol, a polyisocyanate and a catalyst are further blended, and a magnetic substance is dispersed, and this blend is reacted. A magnetic sealer characterized by being hardened and magnetized. 2. The softener is petroleum-based oil, and 500 to 1200 parts of petroleum-based oil are blended with 100 iT [parts] of low molecular weight polyolefin polyol. The magnetic sealer according to claim 1, which is characterized by recovery. 3. The magnetic material is powdered barium ferrite, and for low molecular weight polyolefin polyol 100 Toyobe,
1. The magnetic sealer according to claim 1 or 2, which contains 50 to 2000 parts by weight of barium ferrite.