JPH03220269A - Polyphenylene sulfide composition for powder coating and preparation thereof - Google Patents

Abstract

PURPOSE:To prevent cissing and improve the flatness and uniformity of coating film by mixing a polyphenylene sulfide powder, a silicone oil, and a specific glass filler. CONSTITUTION:100 pts.wt. polyphenylene sulfide powder having a particle diameter of 150mum or lower, 0.001-0.5 pts.wt. silicone oil, and 5-100 pts.wt. glass filler selected from the group consisting of glass bead having a diameter of 100mum or lower, glass powder having a particle diameter of 100mum or lower, and glass fiber having a diameter of 5-15mum and a mean aspect ratio of 20 or lower are mixed in such a way that the whole silicon oil is mixed with a part or the whole of the glass filler to cause the surface of the filler to adsorb the oil, and then the rest of the filler and the whole of the polyphenylene sulfide powder are mixed with resulting mixture.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a polyphenylene sulfide composition for powder coating and a method for producing the same, and more specifically, to a method for forming a coating film with a smooth surface and no pinholes. This invention relates to a polyphenylene sulfide composition for powder coating that can be used for powder coating, and a method for producing the same.

(Conventional technology) Sulfide has properties such as heat resistance, water resistance, chemical resistance, abrasion resistance,
Because it has excellent properties such as electrical insulation, paints based on it are used in fields such as rust prevention and corrosion prevention of metals and electrical insulation treatment.

Paints based on polyphenylene sulfide are usually produced by applying powder or slurry paint to the surface of the object to be coated and then melting it to form a film. It is applied by melting the paint and spraying it onto the surface of the object to form a film. This is because polyphenylene sulfide has the property of being insoluble in any organic solvent.

(Problems to be Solved by the Invention) However, polyphenylene sulfide powder cannot be applied using the electrostatic spray coating method, which is a conventional powder coating method, or the fluidized dip coating method.
When applying a coating using a thermal spraying method, countless repelling phenomena occur on the surface of the coating during hot melting, and these often remain even after curing and cooling, making it extremely difficult to form a smooth and uniform coating. It is difficult to

This phenomenon not only impairs the appearance of the coating, but also causes pinholes, which significantly limits the use of this coating, and a solution is desired.

For these reasons, despite the good properties of polyphenylene sulfide coatings, the use of coatings based on polyphenylene sulfide for powder coating is severely limited.

The present invention solves the above-mentioned problems of polyphenylene sulfide used in powder coating, and provides a polyphenylene sulfide composition for powder coating that does not cause repellency and can make the formed coating film smooth and uniform, and its production. The purpose is to provide a method.

(Means and effects for solving the problem) In order to achieve the above-mentioned object, in the present invention, 100 parts by weight of polyphenylene fluid powder, 0.001 to 0.5 parts by weight of silicone oil, and a particle size of 100
5 to 100 parts by weight of at least one glass filler selected from the group of glass beads with a particle size of 100 μm or less, glass powder with a particle size of 100 μm or less, and short glass fibers with a fiber diameter of 5 to 15 μm and an average aspect ratio of 20 or less. There is provided a polyphenylene sulfide composition for powder coating, characterized in that the entire amount of the silicone oil is mixed with part or all of the glass filler to coat the surface of the glass filler with the silicone. Provided is a method for producing a polyphenylene sulfide composition for powder coating, which comprises adsorbing oil in advance and then mixing the obtained silicone oil adsorbing glass filler with polyphenylene sulfide powder and the remaining glass filler. Ru.

The polyphenylene sulfide compound used in the present invention can also include partially oxidized, branched or crosslinked compounds. Its particle size is
The thickness is suitably 150 μm or less, preferably 100 μm or less, so as to be suitable for electrostatic spray coating, fluidized dip coating, thermal spraying, and the like.

The silicone oil used in the present invention is dimethylpolysiloxane, and modified oils such as methylphenylpolysiloxane are also useful if necessary.

The action of these silicone oils is thought to be that they are uniformly dispersed in the polyphenylene sulfide powder and reduce the surface tension of the surface of the polyphenylene sulfide coating during hot melting, thereby preventing repellency and keeping the surface smooth and uniform. It will be done.

This silicone oil is blended in an amount of 0.001 to 0.5 parts by weight per 100 parts by weight of the polyphenylene sulfide powder. If the blending amount is less than 0.001 parts by weight, the above-mentioned effects will be significantly reduced, and the coating will often repel.
Moreover, even if the amount is more than 0.5 parts by weight, the above-mentioned effect reaches saturation, and the amount is unnecessarily added, which is economically disadvantageous. The preferred amount is 0.002 to 0.4 parts by weight per 100 parts by weight of polyphenylene sulfide powder.

The third essential component in the composition of the present invention is one or more of glass beads, glass powder, and short glass fibers.

These glass fillers are used during the production of the composition as described below.
- first, adsorb the silicone oil described above on its surface,
When it is then dispersed in the polyphenylene sulfide powder, it is a component that acts as a mediator to uniformly disperse the silicone oil between the polyphenylene sulfide powders.

The particle size of the glass beads and glass powder used must be 100 μm or less.

This is because if a particle size larger than 100 μm is used, the smoothness of the formed coating film will deteriorate. Moreover, as short glass fibers, those having a fiber diameter of 5 to 15 μm and an average aspect ratio of 20 or less are used.

In the case of fibers with an average aspect ratio greater than 20, the short glass fibers become intertwined with each other during the production of the composition, leading to adsorption of silicone oil to the short glass fibers and even the polyphenylene sulfide powder of the short glass fibers themselves. Uniform dispersion will deteriorate.

Each of these glass beads, glass powder, and short glass fibers may be used alone, or two or more types may be used in combination as appropriate.

These fillers are polyphenylene sulfide powder 100
It is blended in an amount of 5 to 100 parts by weight. Addition amount to 5
If the amount is less than 100 parts by weight, the amount of silicone oil adsorbed will be less than the polyphenylene sulfide powder, and as a result, the effect will not be exhibited, and if the amount is more than 100 parts by weight, the formed coating will This is because the smoothness of the film deteriorates.

The composition of the present invention is manufactured as follows.

That is, first, part or all of the glass filler described above and the entire amount of silicone oil are stirred and mixed using a stirring device such as a Henschel mixer, so that the silicone oil is adsorbed on the surface of the glass filler in advance.

Next, the obtained silicone oil-adsorbing glass filler, a predetermined amount of polyphenylene sulfide powder, and the remaining amount of the glass filler are mixed and stirred to uniformly disperse the glass filler in the polyphenylene sulfide powder, thereby dispersing the silicone oil. Distribute uniformly.

At the time of this mixing, a predetermined amount of silicone oil may be added dropwise directly to the glass beads, glass powder, and short glass fibers while stirring them with a stirring device. After diluting and mixing with an organic solvent such as , xylene, or ethyl acetate, the organic solvent may be volatilized.

In addition, if necessary, appropriate amounts of color pigments such as titanium dioxide and carbon black; inorganic fillers such as silica and mica; heat stabilizers; ultraviolet stabilizers; .

Other polymers such as polycarbonate polysulfone, polyether sulfone, polyphenylene oxide, polyimide, polyamideimide, epoxy resins may be mixed.

The composition of the present invention can be applied to metals by conventional powder coating methods.

A coating film is formed by coating the surface of an object to be coated, such as glass or ceramics, and then heating it at a temperature of 300 to 400°C for a predetermined period of time.

At this time, prior to powder coating, the surface of the object to be coated may be undercoated with an appropriate primer.

(Examples of the invention) Example 1 Glass beads with a particle size of 45 μm or less (trade name, Unibeads UB-02E, (manufactured by Kikuni Union) 240 g with an internal volume of 7
Pour into Henschel mixer No. 51 and mix at 600 rpm.
While stirring, 0.1 g of silicone oil (trade name, Toray Silicone 5H200 oil, manufactured by Toray Silicone ■) was added dropwise thereto, and the mixture was further stirred for 30 seconds.

Then, the rotation speed was increased to 180 rpm, stirring was continued for about 20 seconds, and then the rotation was stopped.

Then, 4000 g of polyphenylene sulfide powder with an average particle size of 50 μm (trade name, Toprene T-4. manufactured by Toprene) was added onto this, and the whole was stirred at 600 rpm for about 30 seconds and then at 1800 rpm for about 20 seconds. , a composition containing 100 parts by weight of polyphenylene sulfide, 0.0025 parts by weight of silicone oil, and 6 parts by weight of glass beads.

Example 2 A composition was obtained in the same manner as in Example 1, except that the amount of glass beads added was 800 g.

For 100 parts by weight of polyphenylene sulfide powder, 0.0025 parts by weight of silicone oil and 20 parts by weight of glass beads.
Weight part.

Example 3 A composition was obtained in the same manner as in Example 1, except that the amount of glass beads added was 800 gt and the amount of silicone oil dropped was 0.2 g. 0.00 parts by weight of silicone oil per 100 parts by weight of polyphenylene sulfide powder
5 parts by weight, glass beads 20 parts by weight.

Example 4 A composition was obtained in the same manner as in Example 1, except that the amount of glass beads added was 800 g and the amount of silicone oil dropped was 0.8 g. 0.0 parts by weight of silicone oil per 100 parts by weight of polyphenylene sulfide powder
2 parts by weight, 20 parts by weight of glass beads.

Example 5 Except that the amount of glass beads input was s o o g and the amount of silicone oil dropped was 3.2 g.
A composition was obtained in the same manner as in Example 1. 0 silicone oil per 1 part by weight of polyphenylene sulfide powder
．． 08 parts by weight, glass beads 20 parts by weight.

Example 6 The glass beads used were beads with a particle size of 90 μm or less (product name: Unibeads UB-06E, manufactured by ■Union), the amount added was 2000 g, and the amount of silicone oil dropped was 0.2 g. A composition was obtained in the same manner as in Example 1, except that.

For 100 parts by weight of polyphenylene sulfide powder, 0.005 parts by weight of silicone oil and 50 parts by weight of glass beads.

Example 7 Instead of glass beads, use short glass fibers (product name).

Microglass surface strand REV 9゜Made by Nippon Sheet Glass■; Fiber diameter 13±1.5μm, average fiber length 35
A composition was obtained in the same manner as in Example 3, except that 800 g (±15 μm, average aspect ratio 2.7) was used.

0.005 parts by weight of silicone oil per 100 parts by weight of polyphenylene sulfide powder - 20 parts by weight of short glass fibers
Weight part.

Example 8 Short glass fibers (product name) can be used instead of glass beads.

Micro Glass Surf Estland REVII.

Made by Nippon Sheet Glass; fiber diameter 13±1.5μm, average fiber length 150mm, average fiber length 50czm, average aspect ratio 11.5)
A composition was obtained in the same manner as in Example 1, except that 2000 g of polyphenylene sulfide powder was added and 2000 g of polyphenylene sulfide powder was used.

100 parts by weight of polyphenylene sulfide powder, 100 parts by weight of silicone oil, 100 parts by weight of short glass fibers.

Example 9 Glass powder with a particle size of 45 μm or less (
Product name: Unipowder UP-02E.

A composition was obtained in the same manner as in Example 3, except that 800 g (manufactured by Kiki Union) was used.

For 100 parts by weight of polyphenylene sulfide, 0.005 parts by weight of silicone oil and 20 parts by weight of glass powder.

Example IO 4000 g of glass powder with a particle size of 90 μm or less (trade name, Unipowder UP-06E, manufactured by Union) was put into a Henschel mixer with an internal volume of 75j7, and
While stirring at rpm, add the silicone oil 1. used in Example 1. Og was added dropwise and the mixture was further stirred for 30 seconds.

Then, the rotational speed was increased to 1800 rpm, the mixture was stirred for about 20 seconds, and then taken out to prepare a silicone oil masterbatch.

Polyphenylene sulfide powder 400 used in Example 1
0g and 800.2g of the above masterbatch were put into a Henschel mixer, and mixed at 600rpm for about 30 seconds.
A composition was obtained by stirring and mixing at 800 rpm for about 20 seconds.

For 100 parts by weight of polyphenylene sulfide powder, 0.005 parts by weight of silicone oil and 20 parts by weight of glass powder.

Comparative Example 1 The polyphenylene sulfide powder itself used in preparing the composition of Example 1 was prepared.

Comparative Example 2 A composition was obtained in the same manner as in Example 1, except that the amount of glass beads added was 120 g and the amount of silicone oil dropped was 0.2 g.

For 100 parts by weight of polyphenylene sulfide powder, 0.005 parts by weight of silicone oil and 3 parts by weight of glass beads.

Comparative Example 3 A composition was obtained in the same manner as in Example 1, except that the amount of glass beads input was 2400 g and the amount of polyphenylene sulfide powder used was 2000 g.

100 parts by weight of polyphenylene sulfide powder, 120 parts by weight of silicone oil, and 120 parts by weight of glass beads.

Comparative Example 4 A composition was obtained in the same manner as in Example 3, except that the glass beads used were beads with a particle size of 150 μm or less (trade name: Unibeads UB-09E, manufactured by Kiki Union).

For 100 parts by weight of polyphenylene sulfide powder, 0.005 parts by weight of silicone oil and 20 parts by weight of glass beads.

Comparative Example 5 A composition was prepared in the same manner as in Comparative Example 4, except that glass powder with a particle size of 150 μm or less (trade name, Unipowder UP-09E, manufactured by Union) was used in place of the glass beads. Obtained.

For 100 parts by weight of polyphenylene sulfide powder, 0.005 parts by weight of silicone oil and 20 parts by weight of glass powder.

After grid blasting a 5M thick hot rolled steel plate to Sa 21/2, it was preheated to 340°C and the surface was coated with
The above-mentioned 15 types of compositions were electrostatically coated to a thickness of 200 μm and thermally cured at a temperature of 340° C. for 30 minutes.

Example 11 Implemented except that the input amount of short glass fibers was 400 g, the dropped amount of silicone oil was 8 g, and the polyphenylene sulfide powder used was Toprene T-1 (trade name, manufactured by (li) Toprene). A composition was obtained in the same manner as in Example 7. For 100 parts by weight of polyphenylene sulfide powder, 0.2 parts by weight of silicone oil and 10 parts by weight of short glass fibers.

Example 12 Example 1 except that the input amount of short glass fiber was 800 g and the dropped amount of silicone oil was 16 g.
A composition was obtained in the same manner as in Example 1. For 100 parts by weight of polyphenylene sulfide powder, 0.4 parts by weight of silicone oil and 20 parts by weight of short glass fibers.

Example 11 and Example 12 on a thin copper plate with a thickness of 0.3 mark
The two types of compositions were electrostatically coated to a thickness of 60 to 80 μm and thermally cured at a temperature of 340° C. for 10 minutes.

The presence or absence of repellency and smoothness of each of the 17 types of coating films formed above were visually observed. The results are shown in Table 1.

(Margin) (Effect of the invention) As is clear from the above explanation, when the composition of the present invention is used for powder coating, no repelling phenomenon occurs during coating, and the coating film is formed smoothly. I can do it.

The base material is polyphenylene sulfide, and the coating film has excellent heat resistance, water resistance, chemical resistance, abrasion resistance, and electrical insulation properties, so it can be applied to areas where these properties are required. It is useful. Especially in the field of petrochemical industry, oil field pipes.

It is effective in applications such as corrosion-resistant protective coatings for valve fittings, pumps, and other parts, and insulation coatings for electrical and electronic components.

Claims (2)

[Claims] (1) 100 parts by weight of polyphenylene sulfide powder, 0.001 to 0.5 parts by weight of silicone oil, and glass beads with a particle size of 100 μm or less, a particle size of 100 μm
A powder coating characterized by comprising the following glass powder and 5 to 100 parts by weight of at least one glass filler selected from the group of short glass fibers having a fiber diameter of 5 to 15 μm and an average aspect ratio of 20 or less. Polyphenylene sulfide composition for use. (2) After mixing the entire amount of silicone oil with part or all of the glass filler to adsorb the silicone oil on the surface of the glass filler in advance, the obtained silicone oil-adsorbed glass filler and polyphenylene sulfide are mixed together. A method for producing a polyphenylene sulfide composition for powder coating, comprising mixing the powder and a residual glass filler.