JPH04296540A - Formed resin and formed belt using it - Google Patents

Abstract

PURPOSE:To provide a resin composition for transfer belt, etc., with a low friction coefficient and electric conductivity CONSTITUTION:A formed resin is obtained by centrifugal forming of a mixture of polyether type polyurethane and liquid 1,4-polybutadiene. The surface of the product is hardened by treating with hydrochloric acid-chlorinated lime to attack the double bonds of the polybutadiene to obtain a transfer belt with a low friction coefficient.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molded article and a belt molded article used in OA electronic equipment such as copying machines.

0002

2. Description of the Related Art FIG. 3 schematically shows a transfer and conveyance mechanism of a copying machine, which is an OA electronic device that transfers an electrostatic image onto an object. As shown in the figure, inside the copying machine, there is an endless belt 11 for conveyance wound between a pair of pulleys 10, 10 provided at a predetermined interval, and an endless belt 11 disposed at an intermediate position between the endless belt 11. An electrophotographic photoreceptor 12 for forming a toner image is provided. Here, the endless belt 11 is the transferred object 1
3 in close contact with each other, and after transferring the image in the charger section 14, it is sent to the fixing section 15, so it is generally called a transfer conveyance belt.

On the other hand, as an image forming means using an electrophotographic method, as shown in FIG. There is something to transfer next. This transfer intermediate 16
An intermediate transfer conveyor belt made of synthetic rubber is used as an intermediate transfer belt. When this intermediate transfer conveyor belt is used, several toner images can be superimposed on the intermediate transfer conveyor belt and later transferred to the transfer object 13, and the toner images can be overlapped many times when forming a full-color image or a composite image by trimming or masking. This has the advantage that transcripts do not need to be sent.

[0004] Belts used for transfer conveyance, intermediate transfer conveyance, fixing, pressure, etc. are generally made of urethane rubber or ethylene propylene rubber (EPDM), as shown in FIG.
Using synthetic rubber as raw material, it is molded by extrusion molding, centrifugal molding, etc., and then polished to form a belt molded body 02.
Then, by applying a fluorine coat layer to the surface of the obtained belt molded body 02 or coating it with a fluorine tube, a belt 01 having a fluorine coat 03 with improved releasability from toner is obtained. There is.

[0005]

[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, the product goes through a multi-step manufacturing process, which requires a lot of effort and time. There is a problem that it takes. Further, when using a fluorine coating agent, 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 these circumstances, the present invention has been devised to provide an O2 belt for use in belts of OA electronic equipment, etc., which has a low coefficient of friction, can be manufactured simply and at low cost, and has no fear that the fluororesin layer on the surface will peel off.
A. The purpose is to provide a resin molded body and a belt molded body for use in electronic materials.

[0007]

[Means for Solving the Problems] A resin molded article according to the present invention that achieves the above object is a molded article obtained by centrifugally molding a mixed resin containing a polyurethane composition and a liquid polymer having double bonds. It is characterized in that the surface is hardened to provide a surface hardening layer.

[0008] The contents of the present invention will be explained below.

In the present invention, polyurethane refers to polyether-based polyurethane compositions and polyester-based polyurethane compositions, and the specific gravity of polyether-based polyurethane compositions is SG1.05.
Among polyester-based materials, examples include those with an SG of 1.26.

[0010] In the present invention, the liquid polymer having a double bond is one having a double bond at the end or in a bond chain, such as 1,2 liquid polybutadiene (telechelic type), 1,4 liquid polybutadiene (telechelic type), and 1,4 liquid polybutadiene (telechelic type). liquid styrene-butadiene (telechelic type), liquid polychloroprene (terminal functional base material), and the like. Their specific gravity is 1,2- or 1,4-
Liquid butadiene is SG0.89, liquid styrene butadiene is SG0.95, liquid polychloroprene is SG1.2
It is 4.

[0011] In the present invention, these polyurethanes and a liquid polymer having double bonds are mixed, and the difference in their specific gravity is utilized to separate them or to bias their compatibility ratio, and molding is performed to produce an integrated resin molded body. I am getting . 10 in Figure 1
1 illustrates a polymer having double bonds, and a molded body 100
A polymer distribution using the difference in specific gravity is formed inside.

[0012] By hardening the surface of the molded body 100 thus obtained, the coefficient of friction of the surface layer portion (particularly the portion containing more polymers having double bonds) is lowered.

As this hardening treatment, for example, a chemical treatment such as ultraviolet irradiation treatment or hydrochloric acid/Sarashiko treatment is performed to improve the cleaning characteristics (μ value of 0.7 or less) of the surface layer.

The resin molded article thus obtained has a surface layer with a high distribution of polymers having double bonds, which has a low coefficient of friction (
It becomes a polymer material with a low μ value.

The resin composition thus obtained is suitable for use in materials for OA equipment such as transfer belts, intermediate transfer belts, and low μ blades shown in FIGS. 3 to 5.

[0016] Furthermore, when producing a resin molded article, an ion conductive substance such as carbon or lithium perchlorate may be added to further improve the conductivity.

(Test Example) Next, a test example showing the effects of the present invention will be explained. Polyurethane (UR) and butadilene (BR) were mixed in the formulation shown in Table 1 below, and centrifugal molding was performed to obtain a molded article. The obtained molded body was subjected to hydrochloric acid/Sarashiko treatment to harden the surface. As a comparative example, fluorine coating (
20 μm) was used. The friction coefficient (μ), resistance value (Ω), and bending life of the obtained resin molded product were investigated. The results are shown in "Table 1" below.

[0018]

[Table 1]

[0019]

[Embodiment] A preferred embodiment of the present invention will be described below. A transfer belt having the following composition was produced. A molded body was obtained from the liquid mixture having the above composition by centrifugal molding, and then treated with hydrochloric acid to harden the surface to obtain a transfer belt.

When the obtained transfer belt was used for a long period of time as shown in FIG. 3, it was found that it had a low μ and good cleaning properties, and also showed no cracking at all and a good bending life. Ta.

[0021]

Effects of the Invention As explained in detail above, the resin composition of the present invention is obtained by centrifugally molding a mixture of polyurethane and a liquid polymer having double bonds, and also by hardening the surface. The double bond part is hardened and the μ is low.
It is possible to aim for

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a resin composition according to the present invention.

FIG. 2 is a partial schematic diagram of a belt molded product according to the prior art.

FIG. 3 is a schematic diagram of a belt transfer device.

FIG. 4 is a schematic diagram of an intermediate transfer conveyance device.

[Explanation of symbols]

100 Molded object 101 Polymer with double bond

Claims (4)

[Claims] [Claim 1] A molded product obtained by centrifugally molding a mixed resin containing a polyurethane composition and a liquid polymer having double bonds, and the surface of the molded product is hardened to provide a surface hardening layer. Resin molded body. 2. The resin molded article according to claim 1,
A resin molded article, wherein the polyurethane composition is a polyether polyurethane composition or a polyester polyurethane composition. 3. In the resin molded article according to claim 1 or 2, the liquid polymer having double bonds is selected from 1,2 liquid polybutadiene, 1,4 liquid polybutadiene, liquid styrene-butadiene, or liquid polychloroprene. A resin molded body characterized by being selected. 4. A transfer belt for transferring a toner image transferred to a transfer object, the belt being centrifugally formed from a polyurethane composition and a liquid polymer having double bonds, and having double bonds on the surface layer. A belt molded article for transfer, characterized by being made of a liquid polymer that has been hardened.