JPH02232252A - Phenol resin drum base material - Google Patents

Abstract

PURPOSE:To make it possible to perform continuous extrusion molding of a phenol resin drum base material with good surface luster without causing the bleeding of a lubricating agent, and excellent shape accuracy, hardness and mechanical strengths by using a compsn. comprising a filler, various additives, a specified lubricating agent, and a phenol resin. CONSTITUTION:For a phenol resin drum base material which is extrusion-molded by using a phenol resin compsn. prepd. by compounding a phenol resin with a required amt. of an inorg. and/or org. filler and, if necessary, various additives, 0.05-5 pts.wt. fatty acid amide lubricating agent with an m.p. of 90-120 deg.C is added as a lubricating agent to said phenol resin compsn. based on 100 pts.wt. phenol resin. As the fatty acid amide, e.g. stearic acid amide, palmitic acid amide, and arachic acid amide can be cited.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a phenolic resin drum base material for a photoreceptor with improved embossing, particularly used in electrostatic recording devices such as electrophotographic copying machines and facsimile machines. ．． [Prior art] Phenolic resin molded products have superior mechanical strength when heated compared to thermoplastic resin molded products, and also have superior mechanical strength and electrical strength compared to other thermosetting resins. It has excellent physical properties, heat resistance, hydrogen flammability, physical properties, and chemical properties, and is relatively inexpensive, so it is manufactured by compression molding, transfer molding, injection molding, extrusion, etc. A resin composition suitable for the molding method is used. Among the methods for molding these phenolic resin compositions, two extrusion methods have been developed: a plunger extrusion method and a screw extrusion method. Photoreceptor drum base materials, which require good surface gloss and shape accuracy, have traditionally been manufactured from metal materials such as iron, stainless steel, copper, aluminum, and tin, but these materials are particularly lightweight and have excellent workability. Aluminum is mainly used. In order to use aluminum as a drum base material, it is machined to obtain shape and dimensional accuracy, and then mirror-finished.
In addition, it is necessary to remove oil and foreign substances that adhere to the product during this processing, which complicates the manufacturing process. Moreover, the surface of aluminum is very active and tends to be oxidized to form an alumite oxide film, which is a problem in that oxidation must be prevented. There is a need for an inexpensive resin drum base material that overcomes these drawbacks and has various excellent properties. For example, it is possible to manufacture a resin drum base material by continuous extrusion molding of a phenolic resin composition. The Blunger extrusion method is used to produce long extruded products with monotonous shapes, such as drum-shaped products.

However, in plunger extrusion molding equipment, the extrusion pressure in the mold section is high, and intermittent extrusion is used, so it is difficult to obtain uniform molded products with good surface gloss and shape accuracy, and productivity is low. Under these circumstances, a molding method using a so-called screw-type extrusion molding device has been developed. This is a device that guides the phenolic resin composition kneaded and melted in an extruder into a mold through an adapter and shapes it into the final shape. However, with conventional phenolic resin compositions, the extrusion pressure in the mold part is high, and the flow path of the composition is difficult. It changes to A phenolic resin composition for drum-shaped objects with surface gloss and shape precision has not been found. [Problems to be Solved by the Invention] The purpose of the present invention was to solve the above problems by using a phenolic resin composition containing a specific amount of a specific lubricant that can be continuously extruded. easy and cheap,
Good surface gloss with no embossment, shape accuracy,
Our objective is to provide a phenolic resin drum base material with excellent hardness and mechanical strength. [Means for Solving the Problems] As a result of various studies to solve the above-mentioned problems, the inventors of the present invention have added phenolic resins, inorganic fillers and/or organic fillers, and fatty acid amide as a lubricant. By using a phenolic resin composition containing a lubricant and other additives as necessary, a phenolic resin drum base with good surface gloss without embossment, excellent shape accuracy, hardness, and mechanical strength can be obtained. We discovered that the material could be continuously extruded, leading to the present invention. That is, the present invention includes a phenolic resin, an inorganic filler,
In a phenolic resin drum base material that is extrusion-molded using a phenolic resin composition containing a desired amount of an organic filler and/or various additives as necessary, the phenolic resin In the composition, a lubricant with a melting point of 90 to 100 parts by weight of a phenolic resin is added.
This is a phenolic resin drum base material characterized by using a phenolic resin composition containing 0.05 to 5 parts by weight of a fatty acid amide lubricant having a temperature of 120°C.
The phenolic resin used in the present invention is a novolac type phenolic resin obtained by reacting phenols such as phenol, cresol, xylenol, and resorcinol with formaldehydes such as an aqueous formaldehyde solution, paraformaldehyde, and trioxane using an acidic catalyst. Alternatively, a resol type phenol resin obtained by reaction using an alkaline catalyst or a novolac type phenol resin and a resol type phenol resin can be used in combination. Hexamethylenetetramine is usually used as a curing agent added to the phenolic resin.

In this case, hexamethylenetetramine is usually used in an amount of 5 parts by weight or more and less than 25 parts by weight, preferably in a range of 5 to 20 parts by weight, based on 100 parts by weight of the novolac type phenolic resin. If this value is less than 5 parts by weight,
It becomes difficult to obtain a satisfactory molded product, and if the amount exceeds 25 parts by weight, it tends to become difficult to obtain a molded product with good shape accuracy. When using resol type phenolic resin alone or in combination, there is no need to add a curing agent.
The lubricant used in the present invention is a fatty acid amide lubricant having a melting point of 90 to 120°C. Examples include stearic acid amide, palmitic acid amide, arachic acid amide, behenic acid amide, cerotic acid amide, and montanic acid amide'. If the melting point of the lubricant is less than 90°C, the lubricant will melt quickly during extrusion molding, reducing its effectiveness as a lubricant. If the melting point exceeds 120°C, the melting of the lubricant during extrusion molding will be delayed, the lubricating effect of the lubricant will be weakened, and at the same time, a phenomenon will occur where the lubricant will stand out on the surface of the phenolic resin drum base material, causing the surface of the drum base material to deteriorate. When coating a photoreceptor, the gloss is reduced, and the disadvantage is that cleaning with a solvent or the like is required to remove the lubricant that has embossed. The blending amount of the lubricant is 0.05 to 5 parts by weight, preferably 0.1 to 2 parts by weight, per 100 parts by weight of the phenolic resin. If it is less than 0.05 parts by weight, the lubricating effect will be small and the shape will deteriorate. It is not possible to obtain a highly accurate phenolic resin drum base material. On the other hand, if it is used in an amount exceeding 5 parts by weight, the lubricating effect will be too strong (extrusion moldability will be poor, and the lubricant will stand out on the surface of the phenolic resin drum base material). Other additives include inorganic fillers, organic fillers, colorants, plasticizers, and H refueling agents, including the following: Inorganic fillers include, but are not limited to, carbon black, magnesia, basic magnesium silicate, magnesium carbonate, aluminum hydroxide, magnesium hydroxide, alumina powder, various silicates, calcium carbonate, and diatom. Powdered inorganic materials such as earth powder, kaolin, celite, and acid clay, and inorganic fibers such as ceramic fibers, glass fibers, asbestos, Hefdman fibers, rock wool, and carbon fibers can be used.

Examples of organic fillers include, but are not particularly limited to, gibber, wood flour, cotton, linters, polyimide fibers,
They are fibrous materials such as V9 fibers such as vinylon fibers, aromatic polyamide fibers, and aromatic polyester fibers, woven fabrics, and non-woven fabrics. The amount of filler used is phenolic resin 10
The amount is usually 25 to 200 parts by weight, preferably 40 to 180 parts by weight. If it is less than 25 parts by weight, sufficient strength will not be obtained, while if it exceeds 200 parts by weight, extrusion moldability will deteriorate. Colorants include spirit black, molybdenum red,
Phthalocyan blue, cyan green, Hansa yellow, etc. can be used. Plasticizers include furfural, alkylphenol, tricresyl phosphate, polyethylene glycol, dibutyl phthalate,
The most commonly used compounds, such as P-}luenesulfamide, are effective. Examples of flame retardants include antimony oxide, tris(2,3-dibromobutyl) phosphate, and the like. The method for obtaining the phenolic resin drum base material of the present invention includes adding the above novolac type phenol resin, hexamethylenetetramine as a curing agent, or resol type phenol resin with an inorganic filler and/or an organic filler, and a melting point as a lubricant. fatty acid amide lubricant having a temperature of 90 to 120°C;
In addition, colorants, plasticizers, flame retardants, etc. are added as necessary, and a phenolic resin composition is obtained by kneading and pulverizing. Kneading and pulverization can be carried out by any known method.

That is, a hot roll, co-kneader, etc. can be used for kneading, and a speed mill, bower mill, etc. can be used for grinding. The resulting phenolic resin composition is molded into a resin drum base material by compression molding, transfer molding, extrusion molding, etc. Among the above molding methods, it is especially effective when applied to extrusion molding. [Example] The present invention will be explained below with reference to examples. Examples 1-6.
Comparative Examples 1 to 3 Novolac type phenolic resin (120 manufactured by Mitsui Toatsu Chemical Co., Ltd.)
00, softening point 96°C), hexamethylenete[lamin, an inorganic filler and/or an organic filler, a fatty acid amide lubricant, and other additives were mixed in the proportions shown in Table 1. , pre-roll the mixture at 95-100℃
After kneading with the rear roll for 6 minutes at a temperature of 55 to 60°C, a bower mill (using 4ffil1 screen)
The resin composition was pulverized and sized to obtain a resin composition. The obtained resin composition was subjected to the following extrusion test to form a resin drum base material and its physical properties were measured. The results are shown in Table 1. Examples 7-9, Comparative Examples 4-5.

Resol type phenolic resin (Showa Kobunshi, IBRP)
An inorganic filler and/or an organic filler, a fatty acid amide lubricant, and other additives were mixed in the proportions shown in Table 1, and the mixture was kneaded under the same conditions as in Example 1.
A resin composition was obtained by crushing and sizing. The obtained resin composition was subjected to the following extrusion test to form a resin drum base material and its physical properties were measured. The results are shown in Table 1. Extrusion molding test Using an extruder with a diameter of 30a+m and L/D・22, the diameter of the lower part of the screw was 26ms, and the diameter of the tip following the measuring part was 26m.
+ m, compression ratio 2. with smooth section of length 90 l (3D).
0 screw, using each molding material, diameter 30m
A drum base material of K 2 am and K 2 am was molded. The conditions for extrusion molding are room temperature for 2D from the bottom of the hopper, then 3 to 10
0 is 60℃, 110~140 is 80''C, 150~18
Extrusion molding was carried out under conditions such as 0 was set at 105°C, 190 to 220 was set at 150'C, and the screw rotation speed was 35 rpm. Physical property test 1. Embossability of molded product A phenolic resin drum base material molded using a screw extruder was cut into regular lengths. The appearance of the lubricant was visually observed and evaluated. Judgment method: ◎: good, Δ: slightly raised, ×: raised 2. Coating of photoreceptor A phenolic resin drum base material molded using a screw-type extruder was cut into regular lengths. This drum was used to coat the photoreceptor. The coating status of the photoreceptor was observed and evaluated. Judgment method: ◎: Good, Δ: Slightly poor, ×: Poor [Effects of the invention] As described above, the phenolic resin drum base material of the present invention
Blending a specific amount of a specific lubricant in a phenolic resin composition formed by blending a desired amount of an inorganic filler and/or an organic filler and various additives as necessary with a phenolic resin. Due to this, there is no embossment,
The phenolic resin drum base material with good surface gloss has a continuous effect and will greatly contribute to the industrial world.

Patent applicant: Mitsui Toatsu Chemical Co., Ltd.
Format) June 12, 1999 Fumi Takeshi Yoshida, Commissioner of the Japan Patent Office 1. Case Description 1999 Patent Application No. 52058 2. The name of the invention? Enol-based resin drum base material 3. Relationship with the case of the person making the amendment Patent applicant address: 3-2-5 Kasumigaseki, Chiyoda-ku, Tokyo 4. Date of amendment order: May 30, 1999 (shipped) 5. Specification to be amended 6, Contents of amendment

Claims (1)

[Claims] Phenol is extrusion molded using a phenol resin composition made by blending a phenol resin with a desired amount of an inorganic filler, an organic filler, and various additives as necessary. In the resin drum base material,
The phenolic resin composition contains 100% of the phenolic resin.
A phenolic resin drum base material characterized by using a phenolic resin composition in which 0.05 to 5 parts by weight of a fatty acid amide lubricant having a melting point of 90 to 120°C is added as a lubricant based on the weight part. .