JPS60190483A - Polishing agent - Google Patents

Abstract

PURPOSE:A polishing agent keeping polish even on the surface of easily flexible rubber or plastic to be easily brought into contact with hands for a long period, slightly causing cracks, comprising a specific cold-setting silicone resin and a specified organic solvent as main components. CONSTITUTION:The desired polishing agent comprising a cold-setting silicone resin [preferably compound shown by the formula (x+y<20,000)] containing a methoxy group and an organic solvent (preferably 1,1,2-trifluoro-1,2,2-trifluoroethane) having <=100 kauributanol value. USE:Suitable as rubber for handrail.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention C1 relates to a polishing agent, and particularly to a polishing agent for imparting gloss to the surfaces of rubber, plastic, etc.

[Background of the invention]

Rubber and plastic are used in all fields because of their ease of processing and durability.

However, since rubber and plastic have lower hardness than metal, their surfaces tend to get scratched and lose their luster. Therefore, for items such as upholstery and interior goods where appearance is important, it is necessary to maintain the full gloss.

Conventionally, to give gloss to such rubbers and plastics, ordinary waxes using normal paraffin or carnauba wax, or emulsions of silicone oil and water have been used.

Special polishing agents include those whose main ingredients are silicone oil and mineral oil as shown in JP-A No. 55-7862, and monoolefins as shown in JP-A-55-58274. copolymer wax with maleic anhydride,
Wax containing all carboxylic acid and silane as shown in JP-A-55-110170, amine-modified silicone oil as shown in JP-A-56-62861, wax mainly composed of dimethyl silicone oil, etc. is proposed.

However, the above-mentioned polishing agents have a drawback in that the components in the polishing agent are easily transferred to the hands in places that are touched by hands, and the gloss is lost in a relatively short period of time.

Furthermore, the general handrails on passenger conveyors are made of decorative rubber, and the handrail surface -tf+Kfd
The usual method is to apply an emulsion of silicone oil to give it a glossy look. However, since the handrail is touched by the hands of an extremely large number of users, the surface of the handrail loses its luster in an extremely short period of time. For this reason, a method of applying urethane resin or epoxy resin to the surface of the handrail to harden it is also used. However, in a general handrail for a passenger conveyor, as shown in FIG. 1, the handrail 1 is connected in an endless manner and is driven by a drive pulley 2. However, since the handrail surface is in pressure contact with the mold roller 3 and cannot be driven in a bent state, there is a drawback that cracks are likely to occur in the resin layer.

[Purpose of the invention]

An object of the present invention is to provide a polishing agent that can maintain surface luster for a long period of time and is less likely to cause cracks even on rubber or plastic materials that are easily touched by human hands and easily bent. It is in.

[Summary of the invention]

The present inventor has discovered carnauba wax, various oils and fats, polyethylene glycol, silicone oil, alkaline phenolic resin, acrylic rubber, chloroprene rubber, nitrile rubber,
As a result of examining silicone rubber and other materials, it was confirmed that silicone oil has the most polishing effect among these. However, silicone oil is easily transferred. As a result of further research into silicone-based resins, we found that silicone resins, which cure at room temperature by reacting with moisture in the air, can maintain gloss for a long period of time because all the silicone transfers after curing, and because they cure at room temperature, they are also easier to work with. It was found to be good.

Furthermore, as a solvent for such silicone resin,
If the organic solvent has a kauributanol value of 100 or less,
It has been found that it has no effect on rubber or plastic and does not damage the surface of the rubber or plastic.

The present invention was achieved based on such knowledge, and is a polishing agent mainly composed of a cold-curable silicone resin having a methoxy group and an organic solvent having a kauributanol value of 100 or less.

In the present invention, the silicone resin must have a methoxy group bonded to the skeleton group, and may also have an alkyl group or a phenyl group bonded thereto. Here, examples of the alkyl group include a methyl group and an ethyl group.

If both methyl and ethyl groups are bonded, it is necessary that the number of methyl groups is greater than the number of ethyl groups.

As silicone resin, ・・・・・・・・・(1) However, x-1-Y(20000 is particularly effective.

In the case of a room-temperature-curing silicone resin containing a methoxy group, the surface hardness of the film formed is 1 square or more on the pencil hardness scale, making it difficult for transition to occur at all.

The kauributanol value is a value that indicates the relative dissolving power of a hydrocarbon solvent.When a sample solvent is added to 20g of a standard solution of kauri resin dissolved in n-butanol, the kauri resin precipitates to a certain degree. This is the amount of solvent required to cause turbidity, expressed in units of IJ liters. Organic solvents with a Kauributanol number of 100 or less are effective for rubbers or plastics, especially decorative rubbers made from chlorosulfonated polyethylene. Among these organic solvents, fluorocarbon-based organic solvents containing fluorine are preferred; for example, 1,1,2-)dichloro-1,2,2-1-lifluoroethane has a very low surface tension and has good wettability. Also, because the evaporation rate is fast, the working time is short.

[Embodiments of the invention]

Example 1 The silicone resin shown in formula (1) above was heated to 1.1°2-
7% by weight was mixed into trichloro-1,2,2-)1.1 fluoroethane and stirred well to obtain a homogeneous solution. This solution was hand sprayed onto four types of samples: an acrylic board, a styrene board, a chloroprene rubber board, and a natural rubber board, air-dried for 30 minutes, and then heated at 100C for 3 minutes with a dryer.

As a durability test, the sample was thoroughly washed with water and ethanol, and then the surface was rubbed 100 times with a dry cotton cloth at a pressure of 2 g/cm''.The results are shown in Table 1~ It is shown in Table 4.

Table 1 shows the results for acrylic plates, Table 2 shows the results for styrene plates, Table 3 shows the results for chloroprene rubber plates, and Table 4 shows the results for natural rubber plates.

(11) From the results in Tables 1 to 3, the silicone resin shown in formula (1) above and 1.1.2-)lichloro-1°2.2-)
It can be seen that a polishing agent containing refluoromethane as a main component can give gloss to the surface of rubber or plastic and maintain that gloss for a long period of time.

Example 2 Operating for more than 5 years, * Red passenger conveyor handrail.
Experiments were conducted on six types: blue, white, black, red, and navy blue.

Dirt on the surface of the handrail was removed with a 50% ethanol solution that does not substantially have an adverse effect on decorative rubber. After thoroughly drying the handrail, apply the silicone resin shown in formula (1) above to Freon 113 (1°1.2-)lichloro-
A polish diluted to 10% with 1,2,2-)rifluoroethane) was prepared and placed in a hand sprayer and sprayed uniformly onto the handrail surface. Room temperature (24tZ'
) for 4 hours to form a dry coating film having a thickness of approximately IW+, and the passenger conveyor was operated as usual. Results of the surface condition of the handrail one month after the start of operation (12
) are shown in Table 4.

However, the judgment will be based on the following criteria.

XX: The cosmetic rubber has no gloss at all. ×: The cosmetic rubber has almost no gloss. ○: Has the luster of a cosmetic rubber ◎: The decorative rubber has a remarkable shine.

Furthermore, no cracks occurred in the paint film of any color handrail.

〔Effect of the invention〕

As described above, according to the present invention, the transfer of the coating film components on the surface of rubber or plastic (13) is prevented, so gloss can be maintained for a long period of time, and the rubber that moves in a bent state such as a handrail can be used. Alternatively, cracks in the paint film on the plastic surface can be prevented and the gloss can be maintained for a long time.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of a driving state of the passenger conveyor. 1...Handrail, 2...! [1'-IL3...
・Mold roller. Agent Patent attorney Tatsuyuki Unuma (14)

Claims (1)

[Claims] 1. Room temperature curing silicone resin containing methoxy foundation;
A polishing agent characterized by containing as a main component an organic solvent having a Kauributanol value of 100 or less. 2. The glaze according to claim 1, characterized in that the skeleton group of the silicone resin has an alkyl group or a phenyl group bonded to it in addition to the methoxy group. 3. The alkyl group is methyl The polishing agent according to claim 2, characterized in that t% is a group. 4. The polishing agent according to claim 1, wherein the organic solvent is an organic solvent containing fluorine. 5. The organic solvent containing fluorine is 1,1.2-) I
The polishing agent according to claim 4, characterized in that it contains J chloro-1,2,2-)IJ fluoroethante. 6. The polishing agent according to claim 1, wherein the polishing agent is a surface polishing agent for rubber or plastic. 7. The polishing agent according to claim 6, wherein the rubber is a rubber for handrails.