JPS585770A - Nontacky roll of elastic material - Google Patents

Abstract

PURPOSE:To obtain a titled roll which possesses satisfactory elasticity, has excellent adhesiveness to a roll body, and has sufficient nontackiness on the surface by providing a paint layer wherein specific fluororubber paint is cured upon coat and set on the outside surface of the roll. CONSTITUTION:The paint layer wherein the fluororubber paint contg. fluororubber, fluororesin, aminosilane and a liquid carrier is coated and cured is provided on the outside surface of a roll, whereby a nontacky roll of elastic material is produced. If such roll is used, for example, as a fixing roll for electrostatic printing, it has an excellent release property of melt stuck toner, and provides sharp images of printed matter. It has moderate elasticity and obviates the defective feeding materials to be printed on and the irregular exertion of pressure thereon. Further, it has excellent adjesiveness to the metallic roll body and will not easily peel from the roll body. As a drying and feed roll in wet type electrostatic printing, this roll provides high solvent resistance and nontackiness and is used advantageously.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a non-adhesive elastic roll, and more particularly to a non-adhesive elastic roll that is widely applicable to the purpose of preventing adhesion of a welding substance during heating or pressure welding. .

For example, in dry electrostatic printing, a toner image formed on a printing material is finally fused and fixed to the printing material by a fixing roll to obtain a printed material. Conventionally, as this type of fixing roll, an elastic roll with a heat-resistant rubber layer such as silicone rubber or rubber rubber on the outer peripheral surface of the metal roll body has been used, but the fused toner easily adheres to the roll. Since images on printed matter become unclear, a fixing roll with good releasability for fused toner is required.

In order to meet such requirements, the outer peripheral surface of the metal roll body is coated with polytetrafluoroethylene C (abbreviated as PTFEJ). ) layer, a PTFE layer is further applied on the raised circumferential surface of the metal roll body via the rubber layer.
A fixing roll provided with layers has been proposed. Although these fixing rolls are sufficiently satisfactory in terms of releasability of the fused toner, the former roll has low elasticity.

The feedability of the printing material is poor, pressure is applied unevenly, and the roll surface is extremely worn out. Further, due to the inherent non-adhesive property of PTFE, the PTFE layer is easily peeled off from the roll body. In the latter fixer roll.

In addition to the inherent non-stick properties of PTFE, PTFE is added to the rubber layer.
Poor adhesion between the rubber layer and PTFE layer due to the generation of volatiles from the rubber layer due to the high temperature (328°C or higher) during adhesion processing, and the difference in the elastic modulus of rubber and PTFE between the two layers during use. The distortion of the rubber layer and PTFE
Peeling from the layer is likely to occur.

The present inventors have conducted studies to eliminate the drawbacks of the conventional method described above, and as a result, the present inventors have found that a non-adhesive film that maintains satisfactory elasticity, has excellent adhesion to the roll body, and has sufficient non-adhesive properties on its surface. They discovered a elastic roll and completed the present invention.

That is, 1. the present invention is an elastic roll having a rubber layer provided on the outer peripheral surface of the roll body, the rubber layer o surface m < fluororubber paint containing fluororubber, fluororesin, aminosilane, and a liquid carrier applied thereto. It is an object of the present invention to provide a non-adhesive elastic roll characterized in that it is provided with a hardened paint layer.

When the non-adhesive elastic roll of the present invention is used, for example, as a fixing roll for electrostatic printing, it has excellent releasability of the fused toner and does not cause blurred images of printed matter. In addition, it has appropriate elasticity and does not cause poor feeding of the printing material or uneven pressure application. Furthermore, it has excellent adhesion to the metal roll body and does not easily peel off from the roll body.

Other 1. The non-adhesive elastic roll of the present invention is advantageously used as a drying and feeding roll in wet electrostatic printing as it has excellent solvent resistance and non-adhesive properties.

In the present invention, the fluororubber coating film obtained by blending a specific amount of fluororesin imparts excellent non-adhesion to the surface without substantially deteriorating its adhesion to the substrate and mechanical properties. This is because the fluororesin, which itself is non-adhesive, unexpectedly gathers on the surface of the fluororubber coating, so it does not adversely affect the adhesion to the substrate and the mechanical properties of the coating.

It is believed that the above-mentioned performance of the fluororesin is effectively exhibited on the surface of the fluororubber coating.

The fluororubber used in the present invention is a highly fluorinated elastic copolymer, and a particularly preferred fluororubber is usually 40 to 85 mol% of vinylidene fluoride and at least one copolymerizable copolymer therewith. Mention may be made of elastomeric copolymers with one other fluorine-containing ethylenically unsaturated monomer.

In addition, fluororubber containing iodine in the polymer chain has, for example, o, oot to 10% by weight, preferably 0.01 to 5% by weight of iodine bonded to the end of the polymer chain,
Fluororubber whose main composition is an elastic copolymer consisting of 40 to 85 mol% of vinylidene fluoride as described above and at least one other fluorine-containing ethylenically unsaturated monomer that can be copolymerized with vinylidene fluoride ( (Refer to Japanese Patent Application Laid-Open No. 52-40548)
It is. Other fluorine-containing ethylenically unsaturated monomers that can be copolymerized with vinylidene fluoride to give elastic copolymers include hexafluoropropylene, pentafluoropropylene, trifluoroethylene, trifluorochloroethylene, and tetrafluoroethylene. , vinyl fluoride, perfluoro (methyl vinyl ether), perfluoro (ethyl and vinyl ether), perfluoro (
Typical examples include propyl vinyl ether). Particularly desirable fluororubbers are vinylidene fluoride/hexafluoropropylene dielastic copolymer and ethylene/hexafluoropropylene ternary elastic copolymer. In addition, the fluororesin used in the present invention includes polytetrafluoroethylene, tetrafluoroethylene, and at least one other ethylenically unsaturated monomer copolymerizable therewith (for example, olefins such as ethylene and propylene, hexafluoroethylene, etc.). Fluoropropylene, vinylidene fluoride.

Copolymers with chlorotrifluoroethylene, halogenated olefins such as vinyl fluoride, perfluoroalkyl vinyl ethers, etc.).

Examples include polychlorotrifluoroethylene and polyvinylidene fluoride. Among these, preferred fluororesins include at least one of polytetrafluoroethylene, tetrafluoroethylene and hexafluoropropylene, perfluoromethyl vinyl ether, perfluoroethyl vinyl ether, and perfluoropropyl vinyl ether.
It is a copolymer with a species (usually contained in an amount of 40 mol% or less based on tetrafluoroethylene). Furthermore, the aminosilane compound used in the present invention not only functions as a vulcanizing agent for fluororubber, but also greatly contributes to improving the adhesion to the substrate, and can be safely used in liquid media. Representative compounds include r-aminopropyltriethoxysilane (hereinafter referred to as A-1100), N
-β-aminoethyl-r-aminopropyltriethoxysilane, N-()rimethoxysilylprobyl)ethylenediamine, N-β-aminoethyl-r-aminopropylmethyldimethoxysilane, r-ureidopropyltriethoxysilane, β -aminoethyl-β-aminoethyl-
Examples include r-aminopropyltrimethoxysilane.

In addition, the liquid carrier used in the present invention is selected from organic solvents such as lower ketones, lower esters, and cyclic ethers, water, and mixtures of water and water-soluble organic liquids. Examples of water-soluble organic liquids include alcohols. can. Among these liquid carriers, water is most preferred from the viewpoint of coating workability and not damaging the rubber layer of the base material.

Furthermore, inorganic fibrous substances as other substances contained in the fluororubber coating of the present invention are used to improve the compression recovery properties of the fluororubber coating, and typical examples include glass fiber, carbon fiber, and asbestos. Examples include fibers and potassium titanate fibers. It is desirable that the inorganic fibrous material has an average length of at least 1μ, preferably 1 to 100μ.

Further, the amine compound (hereinafter referred to as "amine compound") optionally added to the fluororubber paint of the present invention is:
It mainly functions as a vulcanizing agent for fluororubber, and also improves the mechanical properties of fluororubber, and its representative compounds include ethylamine, propylamine, glutylamine, benzylamine, and allylamine. , n-amylamine, monoamines such as ethanolamine, ethylenediamine, trimethylenediamine, tetramethylenediamine, hexamethylenediamine, 8,9-bis(8-aminopropyl)-2
, 4,8,10-tetraoxaspiro[5,5]undecane CC (hereinafter referred to as -1), and polyamines such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and pentaethylenehexamine. Among these, amine compounds having two or more terminal amino groups are preferred.

To prepare the fluororubber coating of the present invention, it is usual.

A pigment, an acid acceptor, a filler, etc. may be added to the mixture of the fluororubber, the fluororesin, and the liquid carrier according to a conventional method, and if necessary, a surfactant may be used. ),
The aminosilane compound represented by the above general formula and, if necessary, an amine compound are added to the resulting dispersion (additives such as the pigment, acid acceptor, filler, etc. may be added as necessary), and the process is carried out in a conventional manner. Mix thoroughly to obtain a uniform fluororubber paint.

The ratio of fluororubber and fluororesin is 95:5 to 85 by weight.
:65 is desirable, and if the proportion of fluororesin is less than the above lower limit, the desired improvement in non-adhesiveness and lubricity will not be sufficient; on the other hand, if it is higher than the above upper limit, the desired coating thickness will not be achieved. If a film is not obtained, cracks and pinholes are likely to occur in the coating film.

The amount of aminosilane compound added is 100% of normal fluororubber.
The amount is 1 to 30 parts by weight, preferably 1 to 20 parts by weight. When an amine compound is added as desired, it is blended so that the total sum of the aminosilane compound and the amine compound takes the above value. In this case, the molar ratio of the aminosilane compound to the amine compound is selected from the range of 1:99 to 90:10.

As the acid acceptor, those commonly used in the vulcanization of fluororubber can be similarly used, such as one or more divalent metal oxides or hydroxides. Specific examples include oxides or hydroxides of magnesium, calcium, zinc, lead, and the like. Further, as the filler, silica, clay, diatomaceous earth, talc, carbon, etc. are used.

・The fluororubber paint according to the present invention can be applied using the usual coating method (
It is applied or impregnated onto the base material by brush coating, dipping, spraying, etc., at room temperature to 400°C, preferably 100 to 400°C.
The desired fluororubber coating film can be obtained by curing at a temperature of 00°C for an appropriate period of time.

The film thickness of the fluororubber paint according to the present invention is preferably between 1O and 800μ when applied directly to the roll body, and between 1O and 100μ when applied through a rubber layer, and the film thickness is 10μ. If the film thickness is less than 800 microns, the elasticity will be insufficient, and there is a risk that the entire surface of the roll body may become uneven and some areas may not be covered with the film. The most preferable film thickness is 10 to 50, because there is a risk that cracks may occur or it may be difficult to form a uniform film.
It is micron. The fluororubber coating film of the present invention thus obtained has the properties inherent to fluororubber, has excellent adhesion to the roll body and its own mechanical properties, and has a non-adhesive surface. will be granted.

Hereinafter, two embodiments of the present invention shown in the drawings will be described in detail.

In the electrostatic printing process using the xerogrammy method shown in FIG.
The image is exposed onto the photoreceptor 1, and the original plate 4 is placed on the photoreceptor 1.
forms an electrostatic latent image.

This electrostatic latent image is developed by depositing toner 5 to obtain 8. The fixing roll 7 is shown in FIGS. 2, 3, and 4.
As shown in the figure, the following liquids A and B are applied directly to the outer circumferential surface of the metal roll body 7λ or via the fluororubber layer 7C at a ratio of 5 parts of liquid B to 100 parts (parts by weight) of liquid A. The fluororubber paint according to the present invention obtained by blending in the same proportions is applied and cured to form a non-adhesive fluororubber coating film 7b.

A-liquid fluororubber Note 1) Water-based dice version (fluororubber content 60% by weight, including nonionic H3-208) ......166 parts Note 2) Fluororesin water-based die version (FEP content 50% as fluororesin) weight%, including Nonion H5-208) 150 parts Magnesium oxide 3 parts Medium Thermal Carbon 20 parts Nonion MS-210 (manufactured by Bhon Yushi Co., Ltd.) 2 parts water, 50 parts injection properties) Vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene elastic copolymer C (hereinafter simply referred to as fluororubber).

Note 2) Tetrafluoroethylene/hexafluoropropylene copolymer C (hereinafter referred to as FEP).

B-liquid A-1100...40 parts v-11...20 parts Water - Old...40 parts After uniformly mixing A-liquids and B-liquids in this way, mix them with a 200-mesh wire mesh. Using a fluororubber paint obtained by furnace refining, the outer periphery was coated with a 30 μm coating: nozzle diameter 1. Qm spray pressure was 30~''.As a result, a smooth coating film with a thickness of about 30 microns was obtained without any abnormality in the spray coating.

In order to demonstrate the non-adhesive properties of the non-adhesive elastic roll thus obtained, the following reference examples are given.

Reference Example The aforementioned metal roll with a fluororubber layer on its outer periphery and the metal roll with a coated fluororubber layer on its surface were each heated at 180°C for 5 minutes, 100 parts of styrenic resin (manufactured by Standard Oil Co., Ltd.), 5 parts of Peerless 155C (manufactured by Columbia Ribbon & Manufacturing Co., Ltd.), and Oil Black BW (manufactured by Orient Chemical Industry Co., Ltd.)
A toner having an average particle diameter of 15 μm made of a mixture of 5 parts (manufactured by M.D. Co., Ltd.) was applied and fused, and after cooling, a peel test was performed on the toner.

That is, while applying a load of 100 g with the fluororubber coated surface of the iron spatula in contact with the surface of the roll at an angle of approximately 30°, the roll was
Rotate it so that it moves at a speed of /second. As a result,
No peeling of the toner was observed on the roll without the coating, but complete peeling of the toner was observed on the roll with the coating.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the electrostatic printing process using the xerography method, Figure 2 is a perspective view of the roll according to the present invention used in the process, and Figures 3 and 4 are the rolls shown in Figure 2. It is a partially enlarged view which shows the surface state in each different embodiment of. 7... Fixing roll, 7 &... Roll body, 7b...
・Coating film, 7C...fluororubber layer. Patent applicant Daikin Industries Co., Ltd. Representative Patent attorney Aoyama Aoyama and one other person Procedural amendment (September 19, 1980, Commissioner of the Japan Patent Office, 1981 Patent Application No. 103813 2, Invention Name of Non-adhesive Elastic Roll 3, Relationship with the case of the person making the amendment Patent applicant Shojo Osaka Prefecture Danzan Kita'At1g!]llI'1l12
No. 39 J1 Hankyu Building Name (285) Da I +
/[ri: Representative Director Co., Ltd. 11 (... Minoru 4 Detailed explanation column 7 of the agent's invention, details of the amendment The following parts are amended. ■Claims column As per the attached sheet. ■Detailed Description of the Invention Column (1) Page 5, lines 9 to 11, "Surface of the roll body..." was corrected to "On the outer circumferential surface of the roll." +2113W Line 5, "Fluororubber After "paint", insert "may be applied through a rubber layer,". Above (attached sheet) Claim 1: Fluororubber, fluororesin, aminosilane, and liquid carrier are applied to the outer peripheral surface of the roll. 2. A non-adhesive elastic roll comprising a paint layer formed by applying and curing a fluororubber paint comprising: 2. A non-adhesive elastic roll according to claim 1, The weight ratio of the fluororubber and fluororesin is 95;
A roll characterized in that the ratio is 5 to 35:65. 3. A non-adhesive elastic roll according to claim 1, which is coated with the fluororubber coating described above to a thickness of 10 to 300 microns and cured. 4. A roll characterized in that the non-adhesive elastic roll according to claim 1 is a fixing roll in an electrostatic printing device. 5. The non-adhesive elastic roll according to claim 1, wherein the fluororubber coating is blended with an aminosilane compound in a proportion of 1 to 30 parts by weight based on 100 parts by weight of fluororubber. This was published in Japanese Unexamined Patent Publication No. 58-5770 (7
) The role of the character. 6. A non-adhesive elastic roll according to claims 1 to 5, characterized in that the fluororubber coating further contains an amine compound. 7. The roll according to claim 5, wherein the fluororubber coating contains an amine compound having at least two terminal amide groups. 8. The roll according to claim 6 or 7, characterized in that the molar ratio of the aminosilane compound to the amine compound is 1:99 to 90:10. 9. The roll according to claim 1, wherein the fluororubber coating contains an inorganic fibrous substance. 10. The roll according to claim 9, wherein the inorganic fibrous material contained in the fluoro-rubber coating is selected from the group consisting of glass fiber, carbon fiber, asbestos fiber, and potassium titanate fiber. A role characterized by being something. 11. The non-adhesive elastic roll according to claim 1, characterized in that the liquid carrier contained in the fluororubber paint is water. Features a non-adhesive elastic roll.

Claims (1)

[Scope of Claims] 1. An elastic roll having a rubber layer on the outer peripheral surface of the roll body, and a fluororubber paint containing fluororubber, fluororesin, aminosilane, and a liquid carrier on the surface of the rubber layer. A non-adhesive elastic roll characterized by having a paint layer formed by coating and curing. 2. The non-adhesive elastic roll according to claim 1, wherein the weight ratio of the fluororubber to the fluororesin is 95=
A roll characterized in that the ratio is 5 to 85:65. 8. A non-adhesive elastic roll according to claim 1, which is coated with the fluororubber coating described above to a thickness of 10 to 300 microns and cured. 4. A roll characterized in that the non-adhesive elastic roll according to claim 1 is a fixing roll in an electrostatic printing device. 5. The non-adhesive elastic roll according to claim 1, wherein the fluororubber coating is blended with an aminosilane compound in a proportion of 1 to 30 parts by weight based on 100 parts by weight of fluororubber. A roll characterized by: 6. A non-adhesive elastic roll according to claims 1 to 5, characterized in that the fluororubber coating further contains an amine compound. 7. The roll according to claim 5, wherein the fluororubber coating contains an amine compound having at least two terminal amino groups. 8. The roll according to claim 6 or 7, characterized in that the molar ratio of the aminosilane compound to the amine compound is 1=99 to 90:10. 9. The roll according to claim 1, wherein the fluororubber coating contains an inorganic fibrous substance. 10. In the roll according to claim 9, the inorganic fibrous material contained in the fluororubber paint is selected from the group consisting of glass fiber, carbon fiber, asbestos fiber, and potassium titanate fiber. A roll featuring. 11. The non-adhesive elastic roll according to claim 1, characterized in that the liquid carrier contained in the fluororubber paint is water.