JPH04202348A - Roller base material for paper transfer - Google Patents

Abstract

PURPOSE:To provide a roller base material capable of controlling dynamic friction coefficient, excellent in paper-transferring property and used for transferring paper in copying machines, computers, etc., by adding a powdery rubber to a resin composition comprising a phenolic resin, reinforcing fiber, inorganic filler, etc., and subsequently molding the mixture. CONSTITUTION:In a paper-transferring roller base material having a dynamic friction coefficient of 0.3-1.2 is obtained by blending 100 pts of a thermosetting resin composition comprising (A) 100 pts.wt. of a phenolic resin (B) 40-200 pts.wt. of a reinforcing fiber (e.g. glass fiber), (C) 20-200 pts.wt. of an inorganic filler (e.g. carbon black), and, if necessary, various additives with (D) 10-200 pts.wt. of a powdery rubber (e.g. styrene-butadiene rubber).

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a roller base material for paper feeding in copying machines, computers, plotters, etc., and more specifically, the present invention relates to a paper feeding roller base material for copying machines, computers, plotters, etc. This invention relates to a feeding roller base material.

[Conventional technology]

Conventionally, the paper feed roller base material has a metal core, such as stainless steel, brass, or aluminum, and is usually made of φ.
Vulcanized rubber of synthetic rubber such as natural rubber, urethane rubber, styrene-butadiene rubber, nitrile rubber, ethylene propylene rubber, chloroprene rubber, etc. alone or a blend of two or more rubbers, or thermosetting polyester is placed on the shaft of 8 to 35 mm. Coated with thermoplastic elastomers such as urethane rubber, thermosetting polyether elastomer, thermoplastic elastomer based on ethylene-propylene copolymer, copolymer polyamide thermoplastic elastomer, and styrene-butadiene bronocopolymer. and is used.

The coefficient of dynamic friction of these paper feed roller base materials is 0.8
That's all.

On the other hand, the coefficient of dynamic friction of rollers made of general plastics such as polyvinyl chloride, polyethylene, polypropylene, etc. is 0.
5 or less.

Motion W! A paper feed roller base material having a friction coefficient of 0.5 to 0.8 was not obtained. When paper feeding devices for copying machines and computers require paper feed roller base materials having a coefficient of dynamic friction of 0.5 to 0.8, combinations of various rollers have been used. Therefore, there has been a problem in making the device smaller and lighter.

[Problem to be solved by the invention]

The object of the present invention has been made in view of the above-mentioned circumstances, and is to provide a paper feed roller base material whose dynamic friction coefficient can be controlled within the range of 0.3 to 1.2.

[Means to solve the problem]

As a result of various studies to solve the above-mentioned problems, the present inventors have found that powdered rubber is added to a composition containing phenolic resin, reinforcing fibers, inorganic fillers, and various additives as necessary. It was discovered that by adding and molding an excellent paper feed roller base material whose dynamic friction coefficient can be controlled, the present invention was achieved.

That is, the present invention provides a paper feeding roller base formed from a thermosetting resin composition containing a phenolic resin, reinforcing fibers, an inorganic filler, and various additives in desired amounts as necessary. A paper feeding roller base material □ is characterized in that it contains 10 to 200 parts by weight of powdered rubber per 100 parts by weight of the composition.

The phenolic resin used in the present invention may be either a novolac resin or a resol resin obtained using an acid or alkali as a catalyst, or a divalent metal salt may be used to adjust the pH to 50%.
The high-ortho type (novolak with a large amount of ortho bonds) obtained by the reaction in steps 7 to 7 may be used, or both may be used in combination, and if necessary, it may be modified with xylene resin, cresol resin, etc.

The reinforcing fibers used in the present invention include inorganic fibers such as glass fiber, ceramic fiber, Hedman fiber, rock wool, and carbon fiber, Gi pulp, wood flour, linter, coconut shell, polyimide fiber, and aromatic polyester fiber. Examples include organic fibers.

The reinforcing fiber is based on 100 parts by weight of phenolic resin.
40 to 200 parts by weight, preferably 60 to 180 parts by weight are used. If it is less than 40 parts by weight, sufficient mechanical strength cannot be obtained, and if it exceeds 200 parts by weight, extrusion moldability deteriorates.

Inorganic fillers used in the present invention include carbon black, colloidal silica, magnesia, basic magnesium silicate, calcium carbonate, magnesium carbonate, aluminum hydroxide, magnesium hydroxide, various silicates,
Examples include inorganic materials such as alumina powder, kaolin, celite, clay, and acid clay.

The inorganic filler is used in an amount of 20 to 200 parts by weight, preferably 20 to 150 parts by weight, based on 100 parts by weight of the phenolic resin. If it is less than 20 parts by weight, sufficient mechanical strength cannot be obtained, and if it exceeds 200 parts by weight, extrusion moldability becomes poor.

The powder rubber used in the present invention is styrene butadiene rubber, butadiene rubber, isoprene rubber, chloroprene rubber, nitrile butadiene rubber, silicone rubber, urethane rubber, acrylic rubber, epichlorohydrin rubber, etc. Or two or more kinds are used in combination.

゛ The particle size of the powdered rubber is not particularly limited as long as it does not interfere with the surface of the roller, but 10 to 500 μm is usually used. If the particle size is too large, non-uniform areas of powdered rubber will occur in the molding material, resulting in poor extrusion moldability.

Other additives that may be added as necessary include curing agents,
There are curing accelerators, lubricants, colorants, plasticizers, flame retardants, conductivity imparting agents, etc., and the following may be mentioned.

As the curing agent, hexamethylenetetramine is preferably used, but when a resol resin is used alone or in combination as the phenolic resin, it is not necessary to add it. When hexamethylenetetramine is used, it is usually used in an amount of 10 to 20 parts by weight, preferably 12 to 17 parts by weight, per 100 parts by weight of the novolac resin.

As the hardening accelerator, calcium oxide, mag7ium oxide, calcium hydroxide, magnesium hydroxide, etc. are used.

The lubricant is not particularly limited, but higher fatty acids such as stearic acid and balmitic acid, alkaline earth metal salts (calcium salts, magnesium salts) of higher fatty acids, monoclic acid wax, amides of higher fatty acids, and the like can be used. The lubricant may be added by mixing with the resin and others, or in some cases, it may be added after the composition is prepared.

Colorants include spirit black, molybdenum red,
Phthalocyan blue, Phthalon green, Hansa yellow, etc. are used.

As plasticizers, furfural, alkylphenol,
tricresyl phosphate, polyethylene glycol,
Commonly used compounds such as dibutyl phthalate and P-)luyunsulfamide are effective.

Flame retardants include antimony trioxide and tris(2,3-
dibromopropyl) phosphate and the like.

Examples of the conductivity imparting agent include carbon blank, graphite, and ferric oxide.

The composition used for molding the paper feed roller base material of the present invention includes reinforcing fibers, an inorganic filler, and, if necessary, a curing agent, a curing accelerator, a lubricant, a coloring agent, etc., to the above-mentioned phenolic resin. It is obtained by kneading and pulverizing by a well-known method such as a mixing roll method, a Banbury method, or an extrusion method.

A molding material is obtained by mixing powdered rubber with the obtained composition using a known method such as a conical dryer, a V-type blender, or a ribbon blender. The obtained molding material is molded into a pipe shape using an extruder to obtain a paper feed roller base material.

The extruder used to form the paper feeding roller base material of the present invention includes not only a single screw extruder but also a single screw extruder.
Either a twin-screw extruder or a multi-screw extruder whose tips are finally consolidated into a single screw extruder can be used.

As for the internal structure of these extruders, there is no problem in providing a deaeration hole or a special kneading structure between the supply section and the measuring section at the tip of the extruder.

The temperature settings for each part of the extruder will naturally vary depending on the characteristics of the thermosetting resin composition used, the compression ratio of the screw, the gap between the screw smooth part and the barrel, the length of the smooth part, the extrusion speed, etc. The temperature setting of one part of the cylinder corresponding to the compression part, metering part and smooth part is usually 50 to 2.
00°C1 is preferably in the range of 60 to 170°C.

If the set temperature is less than 50°C, the curing reaction of the resin will not proceed sufficiently, making it difficult to obtain a good molded product.On the other hand, if it exceeds 200°C, the resin will harden quickly, making it difficult to extrude.

The paper feeding roller base material of the present invention has a dynamic friction coefficient of 0.3.
It is preferable that it is 1.2. When it is less than 0.3, paper feeding performance deteriorates. If it exceeds 1.2, the paper will be fed too much. More preferably, it is 0.5 to 0.8.

The method for measuring the coefficient of dynamic friction in the present invention is to leave the paper feed roller base material at 23°C ± 2°C, relative humidity 50 ± 5% for 8 hours or more, and then set the surface speed of the roll at 9 m/sec and the weight 1.
6.5 g was applied, and the dynamic friction coefficient was measured using a Toyo Seiki Co., Ltd. type friction coefficient measuring machine rotating roll type TR model.

(Example〕 The present invention will be explained below with reference to Examples.

Examples 1 to 6 To 100 parts by weight of the phenolic resin shown in Table 1, hexamethylenetetramine was used as a curing agent, and glass fiber (manufactured by Central Glass, trade name: EC50) was used as an inorganic filler.
3-167K), wood flour as organic filler (particle size>1
00mesh), clay as an inorganic filler (manufactured by Ueya Kaolin ■, product name Satent NO.

5) Calcium carbonate, spirit blank (manufactured by Chuo Gosei Kagaku ■) as a coloring agent, carbon black (Carbon I 5AF manufactured by TCC Corporation) as a lubricant, and calcium stearate as a lubricant in the proportions shown in Table 1 are kneaded using a mixing roll. did.

Examples 1 to 4 were kneaded with a front roll of 100 to 110°C and a rear roll of 60"C, and Examples 5 to 7 were kneaded with a front roll of 100"C.
~110°C2 followed by kneading at 140~150°C.

After cooling, the mixed material was pulverized to obtain a composition.

The rubber powder shown in Table 1 was mixed into this composition using a V-type blender.

A molding material mixed with this rubber powder was used with a diameter of 301, L/I
) = 22 extruder, the diameter of the screw bottom is 26n
m, diameter 26IIllI, length 90 at the tip following the measuring part
A screw with a compression ratio of 2.0 and a smooth part of m5 (3D) was used, each molding material was used, and the diameter was 30 mm and the wall thickness was 31 mm.
An extruded pipe was formed and cut into a length of 350ml.
A roller base material was obtained.

The extrusion conditions were room temperature for 2D from the bottom of the honbar, then 3~
100 is 80°C, IID~14D is 110°cusD~
Extrusion was performed under the following conditions: 180 was set at 135°C, 1190-22D was set at 160'C, and the screw rotation speed was 35 rpm.

Table 1 shows the coefficient of dynamic friction of the molded roller base material.

Comparative Example 1 The same material as in Example 1 was used to which no polybutadiene rubber powder was added. The coefficient of dynamic friction is shown in Table 1.

Comparative Example 2 Molding was performed using the same material as in Example 5 to which nitrile butadiene rubber powder was not added. The coefficient of dynamic friction is shown in Table 1.

〔Effect of the invention〕

The paper feeding roller base material of the present invention makes it possible to control the coefficient of dynamic friction by changing the amount of rubber added, and has excellent paper feeding properties, so it will greatly contribute to industry.

Claims (1)

[Claims] 1. Phenolic resin with reinforcing fibers and inorganic filler,
In addition, in a paper feed roller base material formed using a thermosetting resin composition containing desired amounts of various additives as necessary, 10 to 200 parts of powdered rubber is added to 100 parts by weight of the composition. A roller base material for paper feeding, characterized in that it contains parts by weight. 2. The paper feeding roller base material according to claim 1, having a dynamic friction coefficient of 0.3 to 1.2. 3. The powdered rubber is selected from the group of styrene-butadiene rubber, butadiene rubber, isoprene rubber, chloroprene rubber, nitrile-butadiene rubber, silicone rubber, urethane rubber, acrylic rubber, and epichlorohydrin rubber, either alone or in combination of two or more. The paper feeding roller base material according to claim 1.