JPH03181564A - Resin molded material - Google Patents

Abstract

PURPOSE:To obtain a resin molded material suitable for belt of OA electronic instrument, etc., comprising thermosetting base resin and specific fluorine-based surface modifier and having modified surface. CONSTITUTION:A thermosetting base resin (e.g. polyurethane) is mixed with 0.5-15wt.% fluorine-based surface modifier having surface-modifying group and reactive group reacting with the base resin in each molecular chain and molded. Fluorine-based surface modifier group is exposed on the surface of resultant molded material and simultaneously reactive group of the surface modifier is tightly kept in the base resin and therefore modification effect is kept for a long period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a resin molded body used in OA electronic equipment such as a copying machine.

<Prior Art> FIG. 4 schematically shows a transfer and conveyance mechanism of a copying machine as an OA electronic device that transfers an electrostatic image to a transfer object. As shown in the figure, inside the copying machine, there is a pair of pulleys I0, 10rIIJ1ζ arranged at a predetermined interval, and an endless belt 11 for conveying the toner. An electrophotographic photoreceptor 12 for forming an image is provided. Here, the endless belt 11 conveys the transfer object 13 in close contact with the object, transfers the image using the charger portion 14, and then sends it to the fixing section 15, so it is generally called a transfer conveyance belt.

On the other hand, as an image forming means using electrophotography,
As shown in the figure, there is one in which a toner image on an electrophotographic photoreceptor 12 is primarily transferred to a transfer intermediate 16 and then secondarily transferred to an object 13 to be transferred. As the transfer intermediate 16, an intermediate transfer conveyor belt made of synthetic rubber is used. By using this intermediate transfer conveyor belt, several toner images can be superimposed on the intermediate transfer conveyor belt and later transferred to the transfer object 13, and can be used many times when forming a full-color image or a composite in-image by trimming or masking. There is an advantage that the transferred material does not have to be sent.

In addition, in the fixing unit 15 of the copying machine described above, instead of using a fixing pressure roll, in recent years, a heat roll 17 and a fixing/pressure roll that contacts a part of the heat roll 17 as shown in FIG. A belt fixing system consisting of a belt 18 is used, and the transferred object 13 is sandwiched therein and fixed and pressed.

This belt fixing has a large contact area, so the fixing and
The pressing force of the pressure belt 18 may be low, and is suitable for precise copying or especially for copying large size sheets, such as AO paper.

Belts used for transfer conveyance, intermediate transfer conveyance, fixing, pressure, etc. are generally made from synthetic rubber such as urethane rubber or ethylene propylene rubber (EPDM), which is formed by extrusion molding, centrifugal molding, etc. After polishing, the surface of the obtained belt is coated with a fluorine coating layer or coated with a fluorine tube to improve the releasability from the toner.

<Problems to be Solved by the Invention> However, in order to manufacture a belt coated with a conventional fluorine coating layer or coated with a fluorine tube,
Since the product is manufactured through a multi-step manufacturing process, there is a problem in that it takes time and effort.

Further, when a fluorine coating agent is used, there is also the problem that the coating technique is difficult and requires more time and effort. Furthermore, there is a problem in that there is a limit to the flex life of the coating between the belt surface and the fluorine coating agent.

In view of the above circumstances, an object of the present invention is to provide a resin molded article for use in belts, rollers, etc. of OA electronic equipment, which can be manufactured easily and at low cost, and which does not have to worry about peeling of the fluororesin layer on the surface. do.

<Means for Solving the Problems> The structure of the resin molded article according to the present invention to achieve the above object (i.e., a thermosetting base resin, a fluorine-based surface compounded in the base resin and in the molecular chain) It is characterized in that it consists of a fluorine-based surface modifier having a modifying group and a reactive group that reacts with the base resin, and the surface is modified with the fluorine-based surface modifying group.

Function> In the above configuration, when the transferred object of the 0ATi slave device is used as a transfer conveyance belt for conveying it to the image transfer section, its surface is modified with a surface modification group, so it cannot be repeatedly used for a long time. However, no toner adhesion was observed on the belt surface.

Practical example A preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective sectional view of the transfer conveyance belt according to this embodiment. As shown in the figure, the belt according to this example is used as the transfer conveyance belt shown in FIG. A fluorine-based surface modifier 102 having a fluorine-based surface modifying group (F) and a reactive group (R) that reacts with the polyurethane as the base resin 101 in the molecular chain is blended into the base resin 101.
Its surface is modified with the fluorine-based surface modification group (F).

Here, the base resin 101 includes polyimide in addition to the above-mentioned polyurethane rubber.

Examples include thermosetting rubber materials such as liquid silicone rubber and liquid EPDM, and resin compositions thereof.

Further, the fluorine-based surface modification material 102 includes a fluorine-based surface modification group (F) such as CF, CFH--CF2-, etc. in the molecular chain, and an OH- For example, a monomer as a reactive group (R) having a molecular weight of 300 to 20
It refers to a fluorine-containing oligomer compound of about 0.00.

Further, the amount of the fluorine-based surface modification material 102 added is 0.
It is preferably 5 to 15% by weight. This is because the addition effect is not exhibited below 0.5% by weight, and 15% by weight or less.
This is because no further addition effect is observed even if the amount is exceeded.

Then, this fluorine-based surface modification material 102 is used as a base@[
11101 and then heated and molded to obtain a resin molded body, the base resin 101 and the fluorine surface modification material 1
When the base resin 02 reacts with the reactive group (R), a fluorine-based surface modification group (F) is exposed on the surface as shown in FIG. The reactive group (R) of the surface modification material 102 of the system is firmly held.

Examples of the method for obtaining the resin molded article include a method in which a mixture of the above composition is injected into a mold and molded, and a method in which the mixture is molded using a centrifugal molding method as shown in the test example below.

In addition to the transfer conveyance belt described in this embodiment, the resin molded body obtained in this manner includes the OAi'Ilt element 111.
In addition to the transfer conveyance roller of the device, the intermediate transfer conveyance belt explained in Fig. 5, the intermediate transfer roller, the pressure/fixing belt explained in Fig. 6, the pressure/fixing roller, etc., combinations of these and O
It should be used for A-related sheet bodies, etc.

As mentioned above, the resin molded article whose surface has been modified with the surface modification group F of the fluorine-based surface modification material undergoes -1 manufacturing process (for example, centrifugal molding, embossing molding, etc.). etc.), and there is no need to go through another complicated process such as fluorine coating or coating after obtaining the molded body as in the past, so it can be manufactured at low cost.

Example of exam Next, a test example showing the effects of the present invention will be explained.

(Material) ・Base resin: Polyurethane (DiprerJ,
167) (Manufactured by DuPont) Polyimide (Trenice #
3000) (manufactured by Toshisha Co., Ltd.)・Crosslinking agent: Curemin MT (manufactured by Ihara Chemical Co., Ltd.)・Fluorine-based surface modification material: Rf Cl, CI (20C1l, CI (20H)
(Rf: C, F1□) Using the above materials, centrifugal molding was performed according to the following manufacturing method with the formulation shown in Table 1 to obtain a resin molded body.

(Manufacturing method) Figure 3 shows the centrifugal molding device used in this test example. As shown in the figure, a heating jacket 33 is placed inside a box-shaped heating jacket 33 whose outer periphery is covered with a burial layer 30 and has a heating fluid passage 31 inside, and whose opening can be closed with M32. A belt was manufactured using a centrifugal forming apparatus in which one end of a rotating shaft 35 provided to be rotated by a motor 34 was inserted through the bottom of the belt, and one end of a cylindrical mold 36 was fixed to one end of the rotating shaft 35.

The mixed liquid shown in the first expression below is rotated at 11,000 rpm. Cylindrical type 3 with inner diameter 100cm and length 400III11
6, and raised the ambient temperature to 120-130℃.
It was centrifuged for 0 minutes.

After stopping the rotation, the belt was taken out from the cylindrical mold 36) and heated at 100° C. for 3 hours to complete curing. The obtained belt had a thickness of 0.611Il11, and its surface was modified with a fluorine-based surface modification group (F).

The characteristics (contact angle of water) of the belt as the obtained resin molded body were measured, and the toner releasability and durability were tested.

Further, when this obtained belt was used as a transfer/transport belt shown in FIG. 4, it had good releasability from toner.

Furthermore, no abnormalities were observed even after long-term use.

Next, the durability and toner releasability were further evaluated using the resin molded body obtained in Test-1, and a cleaning load of 20 g/+m was applied to the surface of the disc-shaped resin molded body rotating at 60 rpm, and a predetermined period of time elapsed. Measurements were taken afterwards.

These results are shown in Table 1.

Shown in Table 2.

From the results in Table 1 and above, it was found that the elastomer molded article of this test example had good durability and toner releasability.

<Effects of the Invention> As described above in detail with Examples and Test Examples, the resin molded article of the present invention has a surface modified with a fluorine-based modifying group, and a paste resin and a fluorine-based surface modification material. Since the belts are firmly bonded, for example, when used as a copying machine belt, the toner has good releasability and durability over a long period of time. Also, unlike conventional methods, it can be manufactured in just a few steps, so it can be manufactured at low cost.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a transfer conveyance belt according to an embodiment of the present invention, Fig. 2 is a conceptual diagram showing the bonding state of a fluorine-based surface modification material and a paste resin, and Fig. 3 is a diagram used in a test example. Figure 4 is a mechanical diagram of a copying machine using a transfer conveyor belt, Figure 5 is a mechanical diagram of a copying machine using an intermediate transfer conveyor belt, and Figure 6 is a pressurizing/fixing machine. 1 is a mechanical diagram of a copying machine using a belt. In the diagram, 101 is a paste resin, 102 is a fluorine-based surface modifier, 10 is a pulley, 11 is an endless belt, 12 is an electrophotographic photoreceptor, 13 is a transferred object, 14 is a part of a charger), and 15 is a fixing device. 16 is a transfer intermediate, 17 is a heat roll, 18 is a fixing/pressure belt, F is a fluorine-based surface modification group, and R is a reactive group that reacts with the paste resin. Figure/102 F: Fluorine-based surface-modifying group R: Anti-reactive group that reacts with the paste resin

Claims (1)

[Scope of Claims] A thermosetting base resin, and a fluorine-based surface modification compounded in this base resin and having a fluorine-based surface modification group in the molecular chain and a reactive group that reacts with the base resin. 1. A resin molded article comprising: a fluorine-based surface-modifying group;