JPH01226640A - Elastic endless transport belt - Google Patents

Abstract

PURPOSE:To obtain a EPDM based white endless belt which maintains the antistatic effect and is free from surface stickiness by allowing the white rubber compound containing ethylene-propylene diene rubber (EPDM) as main constituent to contain the nonionic group antistatic agent and basic silica. CONSTITUTION:Since EPDM is a high polymer which possessed small polarity, if the antistatic agent which possesses small polarity such as nonionic antistatic agent is used, compatibility is improved, and kneading is facilitated. When the rubber added with the kneading type antistatic agent is vulcanized, the antistatic agent bleeds onto the surface of a vulcanizate, and generates the antistatic effect. This comes from the fact that the antistatic agent which bleeds provides the hygroscopic performance and ionic characteristic onto the surface of the vulcanizate, and the electric conductivity of the surface is improved, and the leak performance of static electricity is improved, and the lead speed of static electricity is increased, and the quantity of the generated static electricity is reduced by lowering the frictional coefficient of the surface. Since, in the basic silica, the active group on the particle surface easily adsorbs the nonionic antistatic agent, the excessive bleed of the antistatic agent is suppressed and adjusted, and the antistatic effect can be stabilized for a long period.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an endless elastic conveyor belt used in an automatic original traversing section of a copying machine.

(Prior Art) A copying machine with an automatic document feeding mechanism capable of continuously copying multiple original sheets is shown in FIG.

A plurality of original W43M-wave copies are stacked and placed on the document table 2 arranged at the upper end of the 11II section of the copying machine with the copy side facing toward the page, and the document table cover 4 is attached to one edge. Rotate the center as shown by arrow A in the figure and lower it onto the document table glass 5. In this state, press a switch (not shown) to operate the document table cover 4. The endless elastic conveyor belt 6 is run in the direction of the arrow and placed on the document table 2 [1'! Each time a copy is completed, the original 3 is fed one sheet at a time from the upper side onto the original platen glass 5, and the original 3 is fed into a Japanese-length original insertion hole 7 formed at the other end of the original platen gaff 5. The document is fed from the inside of the copying machine 1 to the document return cassette 8 of the -M section of the copying machine 1.

In addition, as shown in Fig. 1g2, the endless elastic conveyor belt 6 is
It travels by the rotation of the two 1 [gai loaf 9].

Original documents 3t-1jjL are conveyed onto a platen glass 5.

As mentioned above, the endless elastic conveyor belt conveys the original placed on the original document stand onto the original platen glass. H-manuscript? (3) The whiteness of the original is maintained as a packing ground, and the original is not attracted by static electricity when the original is ejected. A characteristic such as 9 is required to obtain a duplicate image.

Therefore, by roughening the conveying surface of the endless elastic conveying belt, it is possible to obtain good l1jL document conveyance performance and document separation property.

TFC, the material forming the endless elastic conveyor belt, is
An elastic material such as rubber or resin is generally used because the belt does not meander and it is necessary to attach accessory devices such as grooves and guides.

Ethylene propylene diene rubber (EPI)
M), The endless elastic conveyor belt made of white rubber made of 1# nitrile butadiene rubber (NBR) has sufficient frictional force between it and the original (paper) to ensure the conveyance of the original 5j! In addition, the endless elastic conveyor belt made of white resin made of polyurethane, etc., does not attract pencil powder, etc.<<The whiteness is maintained well, resulting in high quality copies! Each has its own feature in that a II image can be obtained.

(While the invention is still trying to solve this problem) The endless elastic conveyance belt is often made of white rubber or white resin. It is widely practiced to impart antistatic properties to white resin compositions.

Methods for imparting chargeability include a method of mixing metal powder such as zinc oxide or tin oxide, and a method of adding an inorganic antistatic agent such as -Fi.

However, the method of mixing metal powders (1) makes the surface of the product rich, (2) provides insufficient whiteness, and (3) requires a large amount of metal powder to be mixed in order to impart the desired tetraelectricity. There are some drawbacks such as:

10,000, the method of adding an antistatic agent has the following disadvantages: 1) The antistatic effect is highly dependent on the environment (the antistatic effect will be lost if used for a long period of time), and the antistatic effect will continue for a long time. Therefore, if a large amount of antistatic agent is added, the excess antistatic agent will rise to the surface of the product over the course of 9 hours, resulting in (1) poor appearance due to the sticky surface and dust layer, and (2) poor document conveyance. A Problems such as 9 occur without adversely affecting the photoprint.This tendency is caused by the rapid compatibility with conductive antistatic agents in electrical insulation (under body plate, EPi). Of the endless elastic conveyor belts made of white rubber, which are particularly notable, the EPDM condylar end elastic conveyor belt, which has been praised for its excellent abrasion resistance, has a band 1iL prevention and effect. There are few cases where surface electrical resistance is applied, and even when it is applied, the surface electrical resistance is -7%I.
There are almost no antistatic effects that are as high as 0''Ω or less than 7#.

Meimoto Hattada was invented in view of these circumstances,
The purpose of the present invention is to provide a white endless elastic conveyor belt made of 828M yarn, which does not have a sticky surface due to the embossment of an antistatic agent on the surface of a vulcanizate and has an antistatic effect that lasts for a long period of time.

(Means for Solving the Problems) The present invention is an endless elastic conveyor belt made of a white rubber composition containing ethylene propylene diene rubber as a main component and having a roughened Ji conveying surface.

The gist of the present invention is an endless elastic conveyor belt characterized by containing a nonionic antistatic agent and basic silica in a colored rubber composition.

Antistatic agents are broadly divided into two types: surface-applied type and kneaded-in type. However, from the viewpoints of long-lasting effects, avoidance of static electricity damage during molding, and simplification of construction inspection, etc. Use inhibitors. It was. Kneading type antistatic agents include ionic antistatic agents and nonionic antistatic agents, but when kneading into EPDM thread white rubber formulation, #! The nonionic antistatic agent used in the present invention is a higher alcohol ethylene oxide adduct.

A polyethylene glycol type antistatic agent such as polyethylene glycol fatty acid is a polyhydric alcohol type antistatic agent such as a polyhydric alcohol fatty acid ester.

Basic silica is a white image powder with an 810% content of 80% or more and a particle size of several microns, which is usually produced by a wet process.
The material has M8 or more, but preferably has a pH of 10 or more.

(Function) Unlike nitrile butadiene rubber (NBB), etc., EPI)M is a small, polar polymer, so it is nonionic #!
When an antistatic agent with low polarity such as an antistatic agent is used, the compatibility is good and kneading is easy.

When rubber containing an antistatic agent is vulcanized, the antistatic agent bleeds onto the surface of the vulcanizate, producing an antistatic effect. This is because the bleeding antistatic agent imparts hygroscopicity and ionicity to the surface of the vulcanizate, increasing the electrical conductivity in one surface. A level of energy? This is because it exhibits an antistatic effect by increasing the speed and reducing the amount of static electricity generated by lowering the Jl11 friction coefficient of one surface.

The active groups on the particle surface of basic silica easily absorb nonionic antistatic agents, and as a result, excessive bleeding of the antistatic agent is suppressed, and the bleed of the antistatic agent is kept within a certain range A.
ll! Because of the antistatic effect,
Examples that can stably exhibit the present invention will be described below based on nine practical examples of the present invention.

As shown in Table 1, the endless elastic conveyor belt of the present invention is mainly composed of ethylene 10 vinyl diene rubber (EPi), basic silica, wR titanium, O/V, and a vulcanizing agent (5).
peroxide), a nonionic antistatic agent, etc.

As basic silica, Carplexna 1120 (
s:o=content 86.0-92.0%, pfl
10.4 to 10.9), and polyhydric alcohol type antistatic steel was used as the nonionic antistatic agent.

The white rubber compounded mb A white endless elastic conveyor belt was manufactured. In addition, the conveyor surface forming part of this mold for endless elastic conveyor belt is sand-plasted in advance. A surface formed with a predetermined unevenness by etching or the like is used.

Further, Table 1 shows the results of preliminary characteristics (surface electrical resistance, bleedability) for the example and the conventional example.

(Note 1) The surface electrical resistance of the polyhydric alcohol-type antistatic agent was measured using a surface resistance tube insulation resistance tester after being charged with a voltage of 5 oov for 1 minute at a temperature of 25° C. and a relative humidity of 65 g. The surface electrical resistance was measured using an original sample molded into the dimensions of an endless elastic transporting pelt tt-is, which was heat-aged at 100°C for 1 week and 4 weeks.

The number of days for the antistatic agent to bleed was defined as the number of days until the elastic conveyor belt was left at room temperature and the antistatic agent bled out and stickiness was clearly observed on the surface by visual inspection.

In addition, the dimensional change "4" means that the endless elastic conveyor belt is heated to 0°C.
1 EPDM1001 determined by the rate of increase in length after being left for 5 days under the condition of relative humidity 9596 t#
50 of j1-based silica per 1E part! As is clear from Table 1, the swallow-end elastic conveyor belt (Example) was formed from a white rubber composition containing 3 parts of a nonionic antistatic agent and 3 parts of a nonionic antistatic agent.

100 @CX4W Surface t9IC resistance after heat aging is 4.
As small as 3X 1 og*Ω, the conventional example is 2.8X10"
Compared to Ω or more, the long-term sustainability of the antistatic effect is greatly improved. Furthermore, the antistatic agent's bleed period is extended to more than 30 days, compared to 3 days or less in the conventional case, and the effect of suppressing bleed is significantly improved.

(Effects of the invention) The endless elastic conveyor belt of the present invention has EPDMt as a main component,
Since it is formed from a white powder composition containing a nonionic antistatic agent and basic silica, it has a good antistatic effect due to the presence of the nonionic antistatic agent that has good compatibility with EPL)M. The active groups on the particle surface of basic silica absorb the nonionic antistatic agent and suppress excessive bleeding of the antistatic agent, so the bleed sensitivity of the antistatic agent is appropriately adjusted and the product is stable over a long period of time. The effect of preventing staining is exhibited.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the copying machine, and Fig. 2 is a sectional view showing the driving state of the endless elastic conveyor belt.L: Copying machine
2: Ijii [Stacking table 3: Document 4: Document table cover 5: Document table glass 6: N-end elastic conveyance belt 7: Document insertion hole 8: Document return cassette 9: Drive roller Patent consultant

Claims (1)

[Scope of Claims] An endless elastic conveyor belt formed of a white rubber composition containing ethylene propylene diene rubber as a main component and having a roughened conveyance surface, the white rubber composition comprising a nonionic antistatic agent. An endless elastic conveyor belt characterized by containing an agent and basic silica.