JPS6036171A - Manufacture of rubber-like elastic member having type part - Google Patents

Abstract

PURPOSE:To ensure that an ink spreads well onto the surface of a type and printing with good dimensional stability can be maintained for a long period of time particularly for repeated depression of keys or printing, by incorporating a powder of a polytetrafluoroethylene resin into a rubber-like elastic member. CONSTITUTION:A powder of a polytetrafluoroethylene resin is used as an essential constituent in an amount of 0.01-50pts.wt. per 100pts.wt. of a rubber form base material. If the amount is less than 0.01pts.wt., an effect on the dimensional stability in printing becomes poor. On the other hand, if the amount exceeds 50pts.wt., the viscosity of the resultant material is so high that it is made difficult to work or shape the material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a rubber-like elastic member having a typed portion, and particularly for repeated keystrokes.
The present invention relates to a method of manufacturing a rubber-like elastic member for forming a type part, which has the ability to maintain printing with dimensional stability for a long period of time.

Conventionally, alloy type was used for the type part of printing devices and printing devices, but comb-based type, which has better formability and is cheaper than alloy type, is now being used more frequently. .

In the 1940s, the development of printing technology and various types of computers began.

With the development and presence of islands, the number of printing devices and marking devices has rapidly increased, and as a result, the use of rubber-based basic type 4 typefaces is increasing.

By the way, as the type rubber that has been used in the past has been used repeatedly for printing and keystrokes, the type parts may wear out or become stale, causing the print to become thicker or smudge, resulting in a short period of time. 5: Therefore, the type rubber had to be replaced frequently, leading to an increase in cost. So, from this industry, Go1. quality J,'i
There are strong voices calling for the use of ``n'' in print using 4,1.

In addition to molding the rubber-like elastic part A that looks at the type part, the present invention also allows for good ink transfer to the surface of the type, and prints that are stable in the J method, especially against repeated keystrokes or printing. We created a type rubber that was designed to last for a long time.
(There is.

That is, in the present invention, a rubber base material]()0 city1. ;1.1 for 4 parts
, f,) The present invention relates to a method for manufacturing a rubber-like elastic member having a printed part, characterized in that it contains 111 parts of polytetrafluoroethylene 41.4 fat powder having a width of 1.50.

As the rubber base material used in the present invention, conventionally known rubber base materials can be used. For example, silicone film lx 1 polyurethane rubber, ethylene-propylene terpolymer comb, styrene-butane ethylene comb, acrylic film, butyl film 1. Acrylic nitrile/butanoene rubber, propylene oxide rubber, chloroprene rubber, chlorosulfonated polyethylene, heptadium foam.

Natural rubber etc. can be drilled. Of these, the first three listed, namely silicone rubber, polyurethane rubber and ethylene-propylene terpolymer rubber, are preferred. Incidentally, silicone rubber can be used regardless of its reaction form. That is, using an organic peroxide as a vulcanizing agent
- Heat-curable silicone rubber that cures at relatively high temperatures. I/J addition reaction type silicone rubber that cures at a relatively low temperature, and condensation reaction type silicone rubber that cures at room temperature by W content can be used.

The polytetrafluoroethylene u1 fat powder, which is an essential component of the present invention, is a component for sustaining printing that is consistent with the =j method for a long period of time against repeated keystrokes or printing. If you think about it, it is a component that will destroy the life of printed JIJ rubber. The shape of the primary particles of this polytetrafluoroethylene resin powder is arbitrary, such as spherical, egg-like, flake-like, cylindrical, hide-like, and fibrous. Preferably it is 0.05 to -1, () microns. If there are too many people, the printing paste will be unstable! This is because the effect of L will be poor and if it is too small, it will be difficult to manufacture. It is preferable that the polytetrafluoroethylene resin powder has self-viscosity and spreadability.

The blend m of polytetrafluoroethylene til + fat powder is C() 1 to 50 based on the above-mentioned rubber base material jO() weight part.
The dimensional stability of the print is less effective at the end of the part, and if it exceeds 50 parts by weight, the viscosity becomes too high. come,
This is because JJII'l-ability and moldability become difficult.

The compositions of the present invention include vulcanizing agents (also known as curing agents or crosslinking agents).
is blended. Depending on the type of rubber base material described in 1ii7, it is possible to use an appropriate selection from conventionally known types of vulcanizing agents. For example, free sulfur, sulfur-containing organic compounds, Miso peroxide, dicarbamates, oximes,
Examples include tetrachlor.II-benzoquine, dinitroso compounds, modified 1:1 phenol+i fats, and polyamines. However, it is not limited to this only. Addition of vulcanizing agent 171. It cannot be determined because it varies depending on the type of rubber J, li and the type of vulcanization, but the rubber J,%
141o.

It is common to use needles in the range of 1 to 30 parts by weight. Also, instead of the vulcanizing agent, purple tato wire,
Nitrification methods using radiation etc. can be used. Further, a conventionally known vulcanization accelerator or vulcanization retarder may be added together with the vulcanizing agent.

It is also possible to add finely divided fillers to the compositions of the present invention. These include humid silica, precipitated silica,
Examples include quartz powder, molten earth, acetylene black, carbon black such as 7 Arnes blank, and channel black, mica, talc, calcium carbonate, magnesilano 1 carbonate, alumina, and magnesium oxide. Hydrophobically treated fine powder powders are also used. The amount of all these powder fillers added is usually 10 (
) The range is 5.-200 mji parts based on weight parts.

Furthermore, if necessary, conventionally known colorants, heat resistant agents, antistatic agents, photosensitizers, lubricants, etc. can be added.

The present invention uses a rubber base material described in -11, polytetrafluoroethylene 141 fat powder, a vulcanizing agent, and fillers and additives as necessary using two rolls, a kneader mixer, a hybrid mixer, etc. Mix uniformly and bring to room temperature to j) 00℃,
]() seconds to 2 hours, normal pressure to 4 (,11,1kg/
130'C to 130'C if necessary.
After being subjected to secondary vulcanization in an oven at 300° C. for 30 minutes and 10 hours, or simultaneously with vulcanization, it is molded into a rubber-like elastic member having a type portion for practical use.

The present invention is characterized in that polytetrafluoroethylene IAI fat powder is contained in a rubber-like elastic member having 1 and 2 7Ir1'f' parts.Polytetrafluoroethylene+61
It is preferable that the fat powder is uniformly dispersed throughout the type II hum.1, it is present mostly near the surface of the type part, and less or not present at all in the substrate part of the type part. (Of course, there is no rubber containing polytetrafluoroethylene resin powder and a person.) 5) Paste the rubber horns of the person with the film, and print the rubber horns of the person. May be used as part.

The shape of the rubber-like elastic member having a type part is not particularly limited, and may be, for example, a flat plate having a plurality of protruding type parts, a tape shape, a bell shape, an endless bell shape,
Examples include circular shapes.

The rubber-like elastic member 1 having a type part manufactured according to the present invention has good ink coverage on the surface of the type, and clear printing is possible even with an old key. Since the lifespan can be extended compared to conventional ones, it can be used for all types of type materials where rubber is used, such as jPJK printing plate combs, office rubber stamps, printing rubber, etc., but it is particularly useful for reducing type wear. Computers, calculations (Ideal as the type part of various printing devices).

Next, an example will be given and explained. In the examples, "1 part" means 1 part jIi.

The Q life of rubber type was measured and judged according to the following method.

A rubber sheet with a thickness of 3 m + n is prepared, and from this rubber sheet, the size of type is approximately: (, (', I X 3. (11
61111 character width approximately 0, 2111111+ vortex depth approximately 1. , (+ I made 3 rubber type letters engraved on the + side. Keyboard keystrokes using a solenoid coil #Using a life tester, I stamped 3 on the keystroke part.
Attach the letters by gluing them together, place paper impregnated with ink underneath, and press the key at a speed of 2 times/second. After every J million presses, place a blank sheet of paper and print. Changes were measured.

To measure the character width, we used Profile Bronecta-P, J 3011 manufactured by Koji Seisakusho Co., Ltd., and measured 1 micron at 2 locations per type, and 816 locations for the character width. Measurements were made up to the lt position, and the values were averaged. Based on the printed character width value immediately after the start, 3
The number of key presses when the character width increases by 0% is defined as the yliI life of the type.

Example 1 Polytetrafluoroethylene was added to 10 ( ) parts of copolymer crude rubber consisting of trimethylsiloxane + 1 (99.7 mol %) and 0.3 mol % of methyl vinyl siloxane units and 5 ( ) parts of wet process silica. Add 1.6 parts of +114 fat powder (Teflon 6CJ manufactured by Mitsui 70 Rochemical Co., Ltd.) on two rolls, knead well, and add 2.5-bis(L-butylperoxy) 2.5-bis(L-butylperoxy) as a hardening agent. Add 0.3 parts of trimethylbexane and knead until homogeneous.
21.1! Press vulcanization was carried out for 1 minute at 1 kH/+In'', and then secondary vulcanization was carried out in a hot air circulation oven at 200℃ for 4 hours to obtain 1 g of a 1v x 3 open silicone com sheet.This rubber sheet The results of making rubber type using the horn method described above and measuring its 4f life were 98.
')) times.

As a comparative example, polytetrafluoroethylene 4 was prepared from the composition of L.
14 Exactly the same as article 1 except that only the fat powder was removed +
The lifespan of the rubber type made with '+' was 4 J 11 times, and the lifespan of the rubber type according to the present invention was about 2 times longer than that of the comparative example.
It turns out that life can be extended by more than double.

Example 2 Copolymer raw rubber 10 consisting of 96.7 mol% of dimethylsiloxane at lit position, 3 mol% of methylphenylsiloxane units, and 0.3 mol% of methylvinylsiloxane+1JL position
0 parts, wet process silica 40 parts and polytetrafluoroethylene 4 parts
MIj powder (New Year's 70 Ro Chemical Co., Ltd. Thea0n 6CJ
) l), 4 parts were kneaded until homogeneous.6 Furthermore, as a cross-linking agent, methylhydrononine polysiloxane (25
1°8 parts (viscosity 5 centistokes at 3°C), isop-a-pal solution of chloroplatinic acid (containing platinum @ 1.q/1% by weight) l, 0 as a catalyst for the iris addition reaction.
Part 1 Methylbutyl as a reaction inhibitor 11, 115
Add part to ゛0yen・ni)ノ? , practiced. This is 150°
C, 21) 11 kg/c+n"] Press vulcanize for () minutes to make seven strands of silicone rubber sheet with a thickness of 3 + n + n. The R life of the rubber type made from this rubber sheet is i'i 3)) It was the same.

As a comparative example, polytetrafluoroethylene (
(1) The lifespan of a rubber type made under exactly the same conditions as described in -1-, except that only the fat powder was removed, was 450,000 times, which is about half the lifespan of the type of the present invention. Ta.

Example; (Urepan I; ++, 1 (t!-Friend Bayerne, 1
polyurethane raw rubber) + tl 0 parts, toluylene isocyanate glymer - 8 parts, polytetrafluoroethylene resin powder (Teflon (5C, 1) manufactured by Mitsui 70 Rochem Carne)
+1 and 4 parts were uniformly kneaded and heated at 140°C and 200kHz.
/can2 for 10 minutes to press vulcanize, No.1. (Sa31
A tough polyurethane rubber sheet was obtained. The life of the rubber type made from this rubber sheet was 64 times.

As a comparative example, polytetrafluoroethylene +
1. Except for removing the IIl fat powder. The lifespan of the comb produced under the same conditions as described above was 380,000 times.

Example 4 E P i' 31) 45 (Ethylene-propylene-tsene copolymerized raw polymer made by J1 Petrochemical +1) 1
1.11.1 parts, polytetrafluoroethylene 4jllffi powder (9"I" + 7.1 J-l manufactured Luff I: + 71
．． -5, Il' uniform <: L length 1 () micron) 3 (1
1'ils, Tsukumilba style Kiside 1
．． Add 2 parts and mix evenly, then heat at 150° (:,
', p00 fig/can'' for 20 minutes, then press vulcanize for 20 minutes in a hot air circulation oven for 2 hours at I!'
The lifespan of the rubber sheet and the type made from this rubber sheet was 25 times.

As a comparative example, polytetrafluoroethylene l from the composition 1-
+l+1' except for fat powder, the outside is the same as 1-, article 1
'1 at 11. What is the lifespan of the printed font and type?] +I'rJ
It was the same.

Claims (1)

[Scope of Claims] 1. In the rubber-like elastic member having a printed part, (+, (11
- A method for manufacturing a rubber-like elastic member having a printed part, characterized in that it contains 50 parts by weight of polytetrafluoroethylene resin powder. 2. The method for manufacturing a rubber-like elastic member having a printed part according to claim 1, wherein the rubber base material is silicone rubber, urethane comb, or ethylene-propylene terpolymer rubber.