JPS63291934A - High-frequency fusible synthetic rubber composition and method for applying display, such as letter, picture or pattern, to surface thereof - Google Patents

Abstract

PURPOSE:To obtain a synthetic rubber composition, capable of improving durability of colored coating and carrying out high-frequency fusing, by blending a synthetic rubber with a polar synthetic resin having thermoplasticity in a specific proportion. CONSTITUTION:A composition obtained by blending (A) a synthetic rubber (e.g. acrylonitrile butadiene rubber) with (B) a polar synthetic resin having thermoplasticity (e.g. vinyl chloride resin). A polyvinyl chloride based resin film or sheet is superposed on a required surface of a vulcanized molded rubber product of the above-mentioned composition and sandwiched between electrodes having molds engraved by applying to desired displays, such as letters or patterns, etc., and a high-frequency voltage is applied to fuse and integrate the polyvinyl chloride based resin film to the surface of the vulcanized molded rubber product according to the displays engraved on the electrode mold. Furthermore, blending ratios of the respective components are 15-100pts.wt. component (B) based on 100pts.wt. component (A).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic rubber composition that can be high-frequency welded and a method for displaying characters, designs, etc. on the surface thereof.

Rubber sheets such as synthetic rubber are widely used as floor mats for automobiles, for example, because they conform well to the shape of the floor surface.

When marking the rubber mat with, for example, the product name of the car on which it is laid, the company name, other characters, designs, etc., the above markings can be easily placed by high-frequency welding, etc., as with polyvinyl chloride mats. Cannot be attached. For this reason, the display is made by adding and mixing synthetic rubber with a vulcanizing agent and other necessary compounding agents to obtain an unvulcanized rubber raw material compound, and this unvulcanized compound material is used to display the required characters, designs, patterns, etc. Fill a vulcanization mold with a mold cavity, vulcanize it by the usual method, take out the vulcanized product from the mold, apply paint or other coloring material to the display part engraved on the surface of the vulcanized product, and make it clear. Although the desired rubber mat with the expressed display has been obtained, the colored coating on the display part easily peels off during use and has poor durability, and adding the display requires a lot of work and vulcanization molds. This makes mass production difficult and expensive. In addition, as a method of improving the durability of the colored coating of the display part as described above, a rubber sheet etc. colored as desired is punched out with a punching die corresponding to the display), and the obtained display is applied to an unvulcanized rubber sheet. The rubber mat is inserted in advance into a recess provided in accordance with the punched display, and is vulcanized and integrated with the recess corresponding to the punched display to obtain a rubber mat having the desired display.This method However, there are also many drawbacks as described above.

In view of the above-mentioned shortcomings of the conventional methods, the inventor conducted various research on a method for adding characters, designs, etc. to the surface of rubber molded objects such as rubber sheets by high-frequency processing, and found that a certain amount of polar synthetic resin was added to synthetic rubber. It was discovered that high frequency welding can be performed using a composition containing a mixture of different amounts, and the present invention was achieved based on this finding.

The present invention is composed of synthetic rubber mixed with a certain amount of a thermoplastic polar synthetic resin, and a polar vinyl chloride resin film that can be welded by high frequency is layered on the surface of the resulting structure. It is easy to weld, uses high frequency, and displays letters, designs, etc. on the surface of the synthetic rubber structure easily, looks good, and has excellent durability.
At that time, it does not require a lot of labor and vulcanization molds, etc. as in the conventional method.

The present invention will be described below with reference to examples. Synthetic rubbers include acrylonitrile-butadiene rubber (NBR), and NBR contains acrylonitrile//-j096 with various molecular weights, which can be appropriately selected depending on the purpose. Can be used. Polar synthetic resins having thermoplastic properties that are blended with synthetic rubber such as NBR, that is, synthetic resins that can be high-frequency welded, include vinyl chloride resins such as hard or soft vinyl chloride resins, vinylidene chloride resins, and other polar resins. The blending ratio of the polar resin blended into the synthetic rubber is determined appropriately depending on the composition, physical properties, and use of the structure to be formed, but in the case of NBR,
It is often preferable to use the synthetic resin in an amount of about 10 to /θ0 parts by weight, and about /j to 700 parts by weight, based on 100 parts by weight of NBR.

In addition, the above mixture of NBR and synthetic resin contains the required amounts of vulcanizing agents, vulcanization accelerators, vulcanization accelerators, fillers, softeners, and other compounding agents that are generally added to synthetic rubbers such as NBR. be blended. The amounts of these compounding agents added are the same as in the case of the synthetic resin (two choices can be made).

For example, if the combination of NBR and synthetic resin is as described above,
Vulcanizing agent: approx. 0.2 to 1 part by weight, vulcanization accelerator 0, q to
2.1 parts by weight, about 0.5-1 parts by weight of vulcanization accelerator, about 60-200 parts by weight of filler, about λ-4t of softener! In many cases, only parts by weight are sufficient. However, the present invention is not limited thereto.

The synthetic resin and other compounding agents to be mixed with the pair of N B Ri:1 are subjected to operations such as kneading in a conventional manner to obtain an unvulcanized rubber compound, which has a mold cavity corresponding to the desired molded product. Fill the vulcanization mold, place the vulcanization mold in a vulcanization can, etc., and heat the vulcanization mold to a temperature of approximately
It is treated for several minutes at 60 to 70°C and a pressure of about 79θ to 200 Kv'd4, and the vulcanized molded body is taken out from the vulcanization mold.

A high-frequency weldable synthetic resin film or sheet, such as vinyl chloride, is placed on the obtained molded body, and this is pressed between high-frequency electrodes, and a high-frequency voltage is applied to form the synthetic resin film that has a beautiful surface. Can be welded and integrated onto the body surface.

The above-mentioned high-frequency weldable synthetic resin films, sheets, etc. may be carpets, flocked cloths, etc. having a base fabric or backing layer of these synthetic resins. For the above synthetic resin films, etc., select one that is colored to stand out when welding to the surface of the molded product, and one side of the electrode is engraved with desired characters, designs, etc. A synthetic resin film is sandwiched between the mold and the other electrode so as to face the electrode side of the mold, and when a high frequency voltage is applied, the film corresponds to the mold engraved on the electrode. A conspicuous display can be easily and firmly welded onto the molded body, and the synthetic resin film outside the display can be peeled off as appropriate. If, for example, the outer edge of the mold engraved on the electrode is formed into a fusing edge, the synthetic resin film outside the display can be easily peeled off. In the above case, since one of the electrodes is formed into a mold corresponding to the desired display, a large number of rubber molded bodies with the same display can be easily produced, and no troublesome work or extra equipment is required (Second).

Next, examples of the present invention will be shown.

Raw material blending example'-: ;ToLiT4
After stranding for about 20 minutes, the required amounts of vinyl chloride resin, filler, vulcanizing agent, vulcanization accelerator, vulcanization accelerator, and softener were sequentially added and mixed homogeneously using a conventional method. Then, the obtained mixture was filled into a vulcanization mold (== filled with a mold cavity corresponding to the floor mat of an automobile (approximately 700 ywa x 700 ywa x thickness λ, jm) and heated at a temperature of 6 tps. The treatment was carried out for 5 minutes at ~767°C and a pressure of /90~/92V- to obtain a black vulcanized mat body.On the obtained vulcanized mat body, a white colored layer with a thickness of 0.5 mm was applied. Layer the vinyl chloride resin film (2). Next, layer the vinyl chloride resin film between the electrodes, one electrode of which is a character pattern engraved to correspond to the characters of a trademark, etc., applied to the floor mat. Insert the vulcanized mat body and apply a high frequency voltage (27,/
2 MHz) to 3~! After applying the voltage for seconds, the unwelded vinyl chloride film other than the letters to be taken out was peeled off to obtain a floor mat with white letters welded to the surface of the black rubber fabric. This mat can be used on the floor of a car and the letters will disappear.
Clear letters were maintained for a long period of time without peeling.

EXAMPLE 2 Formulation Example A floor mat having almost the same appearance and excellent durability was obtained in the same manner as in Example 1, except that a vinyl chloride resin film colored with a red pigment was used.

Example 3 An excellent mat was obtained in the same manner as in Example 4, except that Formulation Example 3 was used and an electrode mold engraved with animal designs instead of letters was used.

In the above embodiments, the mats mainly used for the flooring of automobiles etc.
We can also create rugs for floors such as dirt floors, stairs, and hallways, mats, tablecloths for dining tables, wall materials, etc.

Claims (1)

[Scope of Claims] 1. A synthetic rubber composition capable of high frequency welding, which is made by blending a predetermined amount of thermoplastic polar synthetic resin with synthetic rubber. 2. The high-frequency weldable synthetic rubber composition according to claim 1, wherein the synthetic rubber is acrylonitrile-butadiene rubber and the polar synthetic resin is a polyvinyl chloride resin. 3 Add and knead a predetermined amount of polyvinyl chloride resin and other compounding agents to acrylonitrile-butadiene rubber to form an unvulcanized rubber molded body with a uniform composition, which is then processed by a conventional method to form a vulcanized rubber. A polyvinyl chloride resin film or sheet is placed on the desired surface of the vulcanized rubber molded body, and a mold engraved with desired characters, designs, patterns, etc. is placed on one electrode. A polyvinyl chloride resin film is welded and integrated on the surface of the vulcanized rubber molded body in accordance with the markings engraved on the electrode mold by sandwiching the polyvinyl chloride resin film between a pair of electrodes and applying a high frequency voltage to the electrodes. A method for displaying characters, designs, patterns, etc. on the surface of a synthetic rubber molded article (composition) characterized by: