JPS61185201A - Production of rubber boots with barrel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to long boots worn when working in relatively deep water such as in paddy fields or fishing, and the shoe body is made of rubber. This invention relates to a method for manufacturing rubber boots with a boot that can achieve good adhesion between the shoe body and the torso when the chest, whose lower end is fixed to the upper end of the shoe body, is made of soft polychlorinated polychloride leather. be.

[Prior Art] Boots that are shorter than conventional ones, that is, boots whose uppermost openings reach below the knee, are available in two types: rubber boots and soft polyvinyl chloride boots.

Rubber boots do not harden even when worn in cold regions and have excellent stability during employment, but they are inferior in weather resistance and are heavy.
It has the disadvantage of being more expensive than those made of soft polyvinyl chloride.

On the other hand, those made of soft polyvinyl chloride have the advantage of being excellent in weather resistance, lightweight, and inexpensive, but when worn in cold regions, the entire body hardens, making it difficult to use. It has some disadvantages.

(Problem to be solved by the invention 1) Rubber boots and soft polychloride boots each have their advantages and disadvantages, but they are relatively difficult to use when working in paddy fields or fishing. Long boots, that is, boots with a bodice, which are intended for use when working in deep water locations, require a large amount of material to make up the boots, so if they are made entirely of rubber It is undesirable as it becomes heavier and more expensive.
- If the whole body is made of soft polyvinyl chloride, the whole body will harden in cold regions, making it unsuitable for use.

Therefore, the inventor of the present invention has found that the shoe body, which is the lower part of the boot, may be made of rubber, and the chest, which is glued to the outer periphery of the cuff of the shoe body and forms the upper part of the shoe body, may be made of soft polyvinyl chloride. However, we have found that there are various problems in bonding the rubber shoe body and the soft polychlorinated rubber torso.

In other words, in order to bond the torso made of soft polyvinyl chloride leather and the rubber shoe body well around the outer periphery of the cuff of the shoe body, conventionally one of the methods listed below has been used. I had no choice but to do so.

■After vulcanizing the rubber shoe body, buff the outer periphery of the shoe body, and then apply a primer for rubber such as graph 1-polymerized depolymerized rubber to the surface.
An adhesive such as chlorobrene is applied to the surface of one layer of dried brimer, and on the other hand, the inner surface of the lower end of the trunk made of soft polyvinyl chloride leather is first treated with methyl ethyl ketone, and then the surface is coated with e.g.・After applying and drying a soft polyvinyl chloride primer such as a graft polymer of mercury, apply the same adhesive as the adhesive applied to the rubber shoe body to the surface of the first layer of the brimer, and then harden. How to bond adhesives together.

■The inner surface of the lower end of the body made of soft polyvinyl chloride leather is first treated with methyl ethyl ketone, and then a soft polyvinyl chloride primer that has good adhesion to unvulcanized rubber such as elastomer graft polymer is applied to the surface. A method of bonding the outer circumferential surface of the shoe opening of an unvulcanized rubber shoe body, and then vulcanizing the unvulcanized rubber shoe body.

However, among the above methods, the first method has the problem that the number of culms is very large and the workability is extremely poor.
The second method had the following problems.

1) When the rubber shoe body is heated, each material is exposed to high temperatures (generally 125°C to 145°C) for a long time, so the plasticizers and pigments contained in the soft PVC leather may deteriorate or volatilize. However, there is a problem in that the soft PVC leather deteriorates and discolors, and the base fabric that makes up a part of the soft PVC leather also deteriorates. It is expensive because it requires the use of good plasticizers, pigments, and base fabrics.

2) Soft polyvinyl chloride leather tends to shrink when exposed to high temperatures for long periods of time, and the shrinkage layer is particularly large when steam vulcanized, so the dimensions of the body should be determined in advance to anticipate the degree of shrinkage. However, it is very difficult to determine the exact degree of shrinkage in advance.

3) The sulfur used to vulcanize the rubber shoe body tends to cause the stabilizer contained in the soft polyvinyl chloride leather to react with the sulfur and cause discoloration. In particular, light-colored soft polyvinyl chloride leather that uses cadmium-based stabilizers tends to discolor to yellow or dark black due to the volatilization of sulfur. A high-strength stabilizer with good sulfidation resistance must be used for vinyl chloride leather.

4) When the rubber shoe body is vulcanized into a bond bonded to the soft polyvinyl chloride leather, the plasticizer contained in the soft polyvinyl chloride leather migrates to the rubber shoe body side and is bonded to the rubber shoe body. If a soft PVC leather containing a highly migratable plasticizer or a large amount of plasticizer is used, the adhesive strength with the soft PVC leather may be reduced. It is necessary to pay close attention to the plasticizer used because the plasticizer inside tends to migrate to the rubber layer side and swell the rubber portion, reducing adhesive strength.

[Means for Solving the Problems 1] The present invention has been developed as a result of intensive research aimed at eliminating the above-mentioned problems.

Problems such as shrinkage, sulfur resistance, and plasticizer migration can be solved by bonding the rubber shoe body and the torso made of soft polyvinyl chloride leather, which must have a beautiful outer surface, in advance. Because it is vulcanized, it is made of soft polyvinyl chloride that is easily adhered to the torso made of soft polyvinyl chloride leather as the first thing to be adhered to the rubber shoe body, and even if there is some discoloration etc., the torso is made of soft polyvinyl chloride. Using a soft polyvinyl chloride tape whose surface is covered with leather, the rubber shoe body to which this soft polyvinyl chloride tape is adhered is first vulcanized and then bonded with the soft polyvinyl chloride tape and the soft polyvinyl chloride tape. If the torso made of PVC leather is bonded, the only material to be considered is a soft PVC tape, which requires very few materials, making production control very easy and inexpensive. They completed the method of the present invention by discovering that it was possible to produce the following.

That is, in the present invention, a primer is applied to the outer circumferential surface of the opening of the unvulcanized rubber boot body to a thickness of 0.3 to 1.5 mm and a width of 5 to 5 mm.
30IIID for 100 parts of vinyl chloride resin
A torso made of soft polyvinyl chloride leather was made by vulcanizing unvulcanized rubber boots in a conventional manner to which a soft polyvinyl chloride tape containing ~100 parts of plasticizer was blended. The present invention relates to a method of manufacturing rubber boots with a trunk, characterized in that the lower end of the part and the outer circumferential surface of the soft polyvinyl chloride tape are bonded by high-frequency welding.

[Example 1] Hereinafter, a method for manufacturing rubber boots with a trunk according to the present invention will be explained in detail with reference to the drawings.

Figures 1 (a) and (b) are enlarged sectional views of main parts showing the structure of rubber boots with a trunk manufactured by the method of the present invention, and Figure 2 shows the state in the middle of manufacturing rubber boots with a trunk by the method of the present invention. FIG.

In the drawings, reference numeral 1 indicates a soft polyvinyl chloride leather constituting the trunk, and as shown in FIG. As shown in FIG. 2, the base fabric 111 may be present on the inner surface of the soft polyvinyl chloride 111a. Reference numeral 2 denotes a rubber boot body to which the lower end of the soft polyvinyl chloride leather 1 constituting the torso is adhered to the outer peripheral surface of the shoe opening, and includes rubber @2a constituting the outer surface and lining cloth 2b constituting the inner surface. In the present invention, first, a rubber boot main body 2 in which the rubber @ 2a is unvulcanized is prepared. 3
is a soft polyvinyl chloride tape that is attached to the outer peripheral surface of the shoe opening of the unvulcanized rubber boot body 2 via a commonly used primer 4 such as a graft polymer of depolymerized rubber. The thickness of the vinyl chloride tape 3 is 0.3
It has a width of 5 to 30 m and contains 20 to 100 parts by weight of a plasticizer per 100 parts of vinyl chloride resin. The reason why the thickness of this soft polyvinyl chloride tape 3 must be 0.3 to 1.5+ nm is that the soft polyvinyl chloride tape 3 is in high frequency contact with the soft polyvinyl chloride leather 1 constituting the body. ■Thickness is 0.3m because it is glued by glue processing.
If the thickness is less than 1.5 mw, the amount of vinyl chloride resin to be bonded may be too small and good adhesion may not be possible.
When the value exceeds +, the shrinkage that occurs during vulcanization together with the unvulcanized rubber boot body 2 becomes more than enough to be absorbed by the rubber boot body 2, and the adhesion between the soft polyvinyl chloride tape 3 and the rubber boot body 2 becomes impossible. This is because there is a risk of it being destroyed. Also, the width of the soft polyvinyl chloride tape 3 is 5 to 301
IIIl must be width 511III1
This is because if the width is less than 30 Ill, the width of the adhesive part with the rubber boot body 2 will be too narrow and a sufficient adhesive strength between the soft polyvinyl chloride tape 3 and the rubber boots 2 will not be obtained.
This is because if it exceeds I11, the size of the adhesive portion at the mouth becomes too large, making the adhesive portion stiff and the wearing feeling significantly reduced. In addition, soft polyvinyl chloride tape 3
The reason why the amount of plasticizer is less than 20 parts per 100 parts of vinyl chloride resin is that if the amount of plasticizer is less than 20 parts per 100 parts of vinyl chloride resin, the plasticizer will not harden in cold regions. If the amount exceeds 100 parts by weight per 100 parts of vinyl chloride resin, the plasticizer will migrate to the rubber boot body 2 side during vulcanization, reducing the adhesive strength of the primer 4. Although it is undesirable as it lowers the value. Incidentally, reference numeral 5 denotes a bonding portion between the soft polyvinyl chloride chie 73 and the soft polyvinyl chloride leather 1 constituting the body by high-frequency welding.

[Function] To carry out the method of the present invention, first, an unvulcanized rubber boot body 2 is prepared, and a primer 4 is applied to the outer peripheral surface of the rubber boot 28 in a thickness of 0.3 to 1 mm. .5mi+.

After laminating a soft polyvinyl chloride tape 3 having a width of 5 to 30 mm and containing 20 to 100 parts of plasticizer to 100 parts of vinyl chloride resin, the rubber boots body 2 without lJO sulfur is made of soft polychloride. Vulcanize with vinyl tape 3 in a conventional manner, and then soft polyvinyl chloride leather 1
The lower end of the body made in step 1 and the outer peripheral surface of the soft polyvinyl chloride tape 3 may be bonded together by forming a high-frequency welding portion 5 by high-frequency welding.

In this way, when bonding the lower end of the soft polyvinyl chloride 'f-1 and the soft polyvinyl chloride tape 3 by welding, the soft polyvinyl chloride leather 1 is attached to the soft polyvinyl chloride layer 1a. When the cloth 1b is present, the soft polyvinyl chloride 11a located closer to the soft polyvinyl chloride tape 3 than the base cloth 1b and the polyvinyl chloride tape 3 are directly bonded by high frequency welding. When the soft polyvinyl chloride leather 1 has a base fabric 1h on its inner surface, the soft polyvinyl chloride 18 of the soft polyvinyl chloride leather 1 and the soft polyvinyl chloride tape 3 are made of soft polyvinyl chloride. Since the adhesive is to be formed only by the melted portion of the PVC leather 1 that penetrates through the base fabric, the base fabric 1b of the soft PVC leather 1 is made relatively thin so that the adhesive portion 5 can be easily formed by high-frequency welder pressure. It needs to be a coarse cloth.

[Effect Song 1] As detailed above, the present invention provides long boots to be worn when working in relatively deep water such as in paddy fields or fishing, where the shoe body is made of rubber and the upper part of the shoe body is made of rubber. When the torso of the boots is made of soft polyvinyl chloride leather, the shoe body and the torso are bonded to each other by applying a primer to the outer circumferential surface of the opening of the unvulcanized rubber boots to a thickness of 0.3 to 1.5 mm. Width 5
After laminating a polyvinyl chloride tape containing 20 to 100 parts by weight of plasticizer to 100 parts of vinyl chloride resin at ~30IllIIl, the unvulcanized rubber boots are vulcanized by a conventional method, and then soft This invention relates to a method for producing rubber boots with a trunk, which can be successfully produced by a very simple method of bonding the lower end of the torso made of polyvinyl chloride leather and the outer peripheral surface of the polyvinyl chloride tape by high-frequency welding. A groundbreaking rubber torso that solves the various problems that occur when vulcanizing unvulcanized rubber boots by using a special soft polyvinyl chloride tape that has very little vulcanization. This is a manufacturing method for boots, which is easy to carry out, and can produce rubber boots with a trunk at low cost without deteriorating the appearance, and has great industrial value.

[Brief explanation of the drawing]

Figures 1 (a) and (b) are enlarged sectional views of main parts showing the structure of rubber boots with a trunk manufactured by the method of the present invention, and Figure 2 shows the state in the middle of manufacturing rubber boots with a trunk by the method of the present invention. FIG. 1... Made of soft polyvinyl chloride 'f-1a...
Soft polyvinyl chloride garden 1... Base fabric 2... Rubber boots body 2a... Rubber cabinet 21)... Lining fabric 3... Soft polyvinyl chloride tape 4...・Primer 5... High frequency welding part Figure 1 (A) (B) Figure 2

Claims (1)

[Scope of Claims] 1. A primer is applied to the outer peripheral surface of the shoe opening of the unvulcanized rubber boot body to a thickness of 0.3 to 1.5 mm, a width of 5 to 30 mm, and a weight of 20 to 100 parts per 100 parts of vinyl chloride resin. After laminating a soft polyvinyl chloride tape containing a plasticizer, the unvulcanized rubber boots were vulcanized by a conventional method, and then the lower end of the torso made of soft polyvinyl chloride leather and the aforementioned A method for manufacturing rubber boots with a trunk, characterized by bonding a soft polyvinyl chloride tape to the outer peripheral surface by high-frequency welding. 2. The method for producing rubber boots with a trunk according to claim 1, wherein a primer made of a graft polymer of an elastomer is used as the primer applied to the outer peripheral surface of the shoe opening of the unvulcanized rubber boot body. 3. The rubber body with a body according to claim 1 or 2, which uses a soft polyvinyl chloride leather in which a base fabric exists within the polyvinyl chloride layer as the soft polyvinyl chloride leather constituting the body. Method of manufacturing boots. 4. Manufacture of rubber boots with a trunk according to claim 1 or 2, which uses a soft polyvinyl chloride tape with a base fabric on the inner surface as the soft polyvinyl chloride leather constituting the torso. Method.