JPH032363B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for coagulating polymer latexes.

In the chemical industry, large amounts of coagulable substances such as polymer latex and rubber latex are handled, and some of them are used in liquid form as adhesives and paints, but most of them are used as coagulants. Currently, it is used after being solidified.
Therefore, although the coagulation operation is an important operation in these fields, currently the coagulation methods and coagulation apparatuses are based on old techniques obtained through conventional experience.

By the way, speaking specifically in the resin industry, when producing polymer powder from polymer latex produced by emulsion polymerization, it is generally coagulated by bringing the latex into contact with a coagulant consisting of acids or inorganic polyvalent salts. After that, the polymer is usually solidified by a method such as heat treatment, and then subjected to operations such as dehydration and drying to form a dry powder of the polymer. However, according to the commonly used method, the powder particles obtained have an irregular shape, have a wide particle size distribution, and contain coarse particles but also a considerable amount of fine powder. Therefore, there is a reduction in yield due to the scattering of the fine powder, or environmental problems, and furthermore, clogging at piping, storage tank outlet, etc. due to the low fluidity of the powder, deterioration of the working environment due to dust generation, and increased risk of dust explosion. It has some undesirable problems. In addition, the bulk specific gravity of the polymer powder is small and dehydration properties in a dehydrator are poor, so transportation and storage costs are high, and moreover, a large amount of thermal energy is consumed in the drying process.

Incidentally, in view of the importance of coagulation operations in recent years, many studies have been conducted to improve the powder properties of polymer powders. One of these trends in research and development is the slight improvement of conventional coagulation methods or coagulation equipment, and other methods include methods such as spray drying and vapor phase coagulation that utilize gas phase reactions. However, such methods still produce low-grade powders, impose large energy costs and construction costs, and have not yet become a definitive solution.

Under these circumstances, the present inventors have developed an invention in which a high bulk specific gravity powder or granule substantially free of fine powder and coarse particles can be obtained by discharging emulsified latex into a coagulating liquid from a capillary that satisfies specific conditions. Regarding this, we first filed Japanese Patent Application No. 73115 (1983)
A patent application was filed as (No. 187322).

Based on the previous invention, the inventors of the present invention have conducted extensive studies and found that by using a nozzle with a specific structure as a latex coagulating nozzle for coagulating polymer latex, polymer powder particles with extremely excellent powder properties can be produced. The inventors have discovered that this can be done, and have arrived at the present invention.

The present invention uses a latex coagulating nozzle that is capable of discharging the latex from a thin tube provided on a substrate when coagulating a polymer latex, and that also allows the coagulation liquid to be discharged from around the thin tube. A method for coagulating a polymer latex, characterized in that it is used.

The structure of an example of a nozzle for coagulating latex used in the present invention will be explained based on the drawings. The drawing is a cross-sectional perspective view of an example of a latex coagulating nozzle used in the present invention, and in the drawing 1 is a thin tube;
2 is a substrate, 3 is a holder, 4 is a gasket, 5 is a fastener, 6 is a coagulation liquid supply device, 7 is a coagulation liquid introduction pipe, 8
is a coagulation liquid discharge port. In this nozzle, the thin tube and the substrate must be fixed directly or with an adhesive, and there must be no gap between them from which a coagulable substance may leak. In addition, the gasket connecting the substrate and holder should be in perfect contact to prevent coagulable substances from leaking outside. Similarly, the bonding portion between the substrate and the coagulation liquid supply device should be in close contact with each other to prevent the coagulation liquid from leaking to the outside.
In addition, the coagulation liquid supply device and coagulation liquid introduction pipe are installed using the usual method.
For example, is it fixed by welding, gluing, screwing, etc.
Alternatively, it is preferable to handle it if it is a single piece.

The features of the nozzle for coagulating latex according to the present invention are: 1. A coagulable substance such as a polymer latex can be discharged from a capillary. 2. A coagulating liquid can be discharged from around the capillary. The biggest advantage is that the coagulating liquid flows in a manner that envelops the discharged coagulable substance, causing a coagulation reaction.It is not easily affected by the flow of water or coagulating liquid around the nozzle, and the coagulating property discharged by a vortex flow Since the substances do not coalesce together to form a coarse mass, the arrangement of the thin tubes can be freely determined.

The nozzle for latex coagulation according to the present invention is not limited to the embodiment in which the tip of the thin tube and the discharge port of the coagulating liquid are on the same plane as shown in the drawings, but also the embodiment in which the thin tube protrudes from the coagulating liquid supply device, or the tip of the thin tube. may be located closer to the substrate than the coagulation liquid discharge port. However, the tip of the capillary needs to be in a region where the coagulation fluid flows in the capillary axial direction, and this region depends on the shape of the coagulation fluid supply device, the shape of the coagulation fluid discharge port, the supply flow rate of the coagulation fluid, etc. It can be adjusted to some extent.

Furthermore, when using the latex coagulating nozzle of the present invention, it is not preferable to use it in air, and it is necessary to install it in still water or a coagulating liquid, or in quietly flowing water or a coagulating liquid. After that, the coagulable substance is guided from the holder into the thin tube and discharged from the tip thereof, and at the same time, the coagulated liquid is discharged from the coagulated liquid outlet of the coagulated liquid supply device, that is, from around the thin tube, thereby achieving extremely powder characteristics. It is possible to produce powder with excellent properties.

In addition, in the latex coagulating nozzle of the present invention, the coagulable substances discharged from the thin tubes coagulate in independent coagulating liquid flows to form filamentous aggregates, so the overall shape can be freely selected. be. Therefore, there is no restriction on the number of thin tubes per nozzle.

On the other hand, in a method of producing a powder with excellent granular powder characteristics by discharging a coagulable substance from a thin tube into a coagulating liquid to form a filamentous aggregate, and then cutting the filament appropriately by a method such as stirring, it is difficult to operate. What is important is the relative flow velocity of the coagulating liquid and the coagulable substance. In other words, when the flow rates of the coagulating liquid and the coagulating substance are equal, the discharged coagulating substance is not subjected to any disturbance and coagulates as it is. Further, if the flow rate of the coagulable substance is faster than the flow rate of the coagulating liquid to a certain extent, the discharged coagulable substance will undergo a fluctuation phenomenon immediately after being discharged, and the aggregates will become watery. Furthermore, when the flow rate of the coagulable substance is increased, the strain stress generated at the interface between the jet flow created by the discharged coagulable substance and the coagulating liquid overcomes the mechanical strength of the coagulable substance that is solidifying, and the coagulable substance breaks into pieces. Therefore, good granular powder cannot be obtained. Therefore, in order to increase the amount of coagulable material discharged per capillary tube and improve nozzle productivity, it is necessary to increase the flow rate of the coagulating liquid. When the flow rate of the surrounding coagulating liquid is increased, the vortex region generated downstream of the nozzle expands, so the thin tube needs to be made longer in order to discharge the coagulable substance into the laminar region that exists outside the vortex region. This is unfavorable in terms of manufacturing or handling of the nozzle. However, if the nozzle is as shown in the drawing, simply increasing the flow rate of the coagulating liquid introduced into the coagulating liquid supply device will increase the flow rate of the coagulating liquid relative to the coagulating substance to be discharged. Therefore, it is possible to increase the flow rate of the coagulable substance, which is industrially advantageous. In addition, the thin tube is protected from external mechanical forces by the coagulating liquid feeder, which is extremely advantageous in handling the nozzle. That is, the industrially most advantageous nozzle is a nozzle having a structure that allows the coagulating liquid to be discharged from around the thin tube through which the coagulable substance flows.

The thin tube constituting the nozzle for latex coagulation in the present invention is disclosed in Japanese Patent Application No. 56-73115 (Japanese Unexamined Patent Publication No.
57-187322),
There are no particular restrictions on the pipe diameter, but the inner diameter is 3mm.
Hereinafter, the outer diameter is preferably 5 mm or less. The material of the tube is glass; inorganic sintered body; polymethyl methacrylate, polyvinyl chloride, polyamide, polyester, polycarbonate, polypropylene, polyethylene, ABS resin, polyacetal, AS resin,
Synthetic resins such as fluororesins; metals such as stainless steel, copper, platinum, gold, and lead are preferred;
The material is not limited to these, but any material can be used as long as it is chemically stable to coagulating liquids and coagulable substances.

Further, the material of the substrate constituting the latex coagulation nozzle can be the same as the material constituting the capillary described above, and any material may be used as long as it is chemically stable to the coagulating liquid and the coagulable substance. Further, the shape of the substrate can be any shape such as circular, square, rectangular, oval, etc.

Here, the tube and the substrate must be firmly attached.
Possible fixing methods include using an adhesive, directly fixing the thin tube and the substrate, molding them as an integral body, and screwing them together.

When using an adhesive, any adhesive can be used as long as it is chemically stable to coagulating liquids and coagulable substances and has the ability to bond the capillary and the substrate, such as epoxy adhesive. Agents, rubber adhesives, hot melt adhesives, etc. can be used.

In the case of directly fixing the thin tube and the substrate, there is a method of pouring a polymerizable substance forming the substrate into a mold in which the thin tube is fixed and causing a polymerization reaction, thereby fixing the substrate and the thin tube. An example of this method is to pour a molten substance forming the substrate into the substrate, and then cool and solidify the substance, thereby fixing the substrate and the thin tube. Moreover, when molding as an integral part, injection molding using synthetic resin, casting molding using metal, etc. are used.

In the screwing method, it is sufficient to cut a male thread on the thin tube and a female thread on the substrate, and then screw the thin tube into the substrate.

Furthermore, the holder constituting the latex coagulating nozzle is for distributing the coagulable substance supplied from the piping into the thin tubes, and usually has a funnel shape. The material for this holder can be the same as the material constituting the thin tube.

For the purpose of easy maintenance, it is preferable that the substrate and the holder have a structure that allows them to be separated, but the structure is not necessarily limited to this. In the case of a separable structure, for example, the substrate and the holder may be joined with a fastener via a gasket. As the gasket, a rubber plate, a polytetrafluoroethylene plate, an O-ring, etc. can be used. Further, as the fastener, ordinary means such as a bolt, a vise, a tightening ring, etc. can be used.

Next, the coagulating liquid supply device constituting the coagulating nozzle of the present invention has a coagulating liquid inlet tube and has the same number of coagulating liquid discharge ports as the number of capillary tubes. When the thin tube reaches the coagulation liquid discharge port, the gap between the coagulation liquid supply device and the thin tube is preferably 3 mm or less, but it is not necessarily limited to this. Further, it seems preferable that the length of the coagulation liquid discharge port be longer than the above-mentioned gap since it is necessary to rectify the flow of the coagulation liquid. For manufacturing, assembly, and maintenance reasons, it is preferable that the coagulating liquid supply device be able to be separated from the substrate, and in this case, it is joined with a fastener via a similar gasket as in the case of joining the substrate and holder.

The material of the coagulation liquid supply device and the coagulation liquid introduction tube may be the same as the material constituting the thin tube.

The coagulating method of the present invention allows the coagulating liquid to flow in a manner that envelops the coagulable substance discharged by the nozzle used, so it is less affected by the flow of water or coagulating liquid around the nozzle, and the coagulating substance discharged by the vortex flow. It has excellent effects such as preventing the particles from coalescing into large lumps.

As the polymer latex used in the present invention, most polymer latexes that can be obtained by emulsion polymerization and can be recovered can be used. Particularly effective polymer latexes include latexes obtained by emulsion polymerization of ethylenic monomers, rubbery polymer latexes, latexes obtained by graft polymerizing ethylenic monomers onto rubbery polymers, and ethylene. Latexes obtained by graft-polymerizing a rubber-forming monomer onto a polymer of a rubber-forming monomer, and mixed latexes thereof can be mentioned.

Examples of ethylenic monomers include styrene monomers such as styrene, α-methylstyrene, O-ethylstyrene, O-chlorostyrene, P-chlorostyrene, and divinylbenzene, acrylonitrile,
Acrylonitrile monomers such as vinylidene cyanide, acrylic acid esters such as acrylic acid, methyl acrylate, and ethyl acrylate, methacrylic acid esters such as methacrylic acid, methyl methacrylate, and ethyl methacrylate, vinyl esters such as vinyl acetate, Examples include vinylidene such as vinylidene chloride, vinyl halides such as vinyl chloride, vinyl ketone, acrylamide, maleic anhydride, etc. These monomers can be used alone,
or used in combination.

Examples of rubbery polymers include natural or synthetic rubbers such as natural rubber, butadiene rubber, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, isobrene rubber, chloroprene rubber, acrylic rubber, and ethylene-vinyl acetate copolymer. Examples include polymers.

As a coagulant for the polymer latex used in the present invention, all commonly used acids or water-soluble inorganic salts can be used. Examples of acids include mineral acids such as sulfuric acid and hydrochloric acid, and acetic acid, which has a dissociation constant of 10 ^{- 6} mol/or more of organic acids (including benzoic acid, salicylic acid, formic acid, and tartaric acid), salts include sulfates such as magnesium sulfate and sodium sulfate, chlorides, and acetates; mixtures of these can also be used. .

Known additives such as dispersants, lubricants, thickeners, surfactants, plasticizers, antioxidants, colorants, and blowing agents can also be added to the polymer latex in advance. In particular, the dispersant may greatly affect the particle shape stability of the secondary particles formed by coagulation. As the dispersant, inorganic dispersants and organic dispersants that are commonly used as stabilizers for emulsion polymerization and suspension polymerization can be used. Examples of inorganic dispersants include magnesium carbonate and tribasic calcium phosphate, and among organic dispersants, natural and synthetic polymer dispersants include starch, gelatin, acrylamide, partially saponified polyvinyl alcohol, and partially saponified polymethacrylic acid. Methyl, polyacrylic acid and its salts, cellulose, methylcellulose, polyalkylene oxide, polyvinylpyrodrine, polyvinylimidazole, sulfonated polystyrene, etc., and as low molecular dispersants, for example, alkylbenzene sulfonates, fatty acid salts, etc. Conventional emulsifiers can also be used.

It is also possible to facilitate the formation of secondary particles and control the particle shape by adding starch syrup, paraffin, etc. as a thickener.

Hereinafter, the present invention will be specifically explained with reference to Examples. In Examples and Comparative Examples, "parts" and "%" are all "parts by weight" and "% by weight."

Example 1 An outer diameter of 2 mm, an inner diameter of 1 mm, and a length of 50 mm are evenly distributed on a polymethyl methacrylate substrate with a thickness of 6 mm and a diameter of 150 mm.
Insert 100 thin tubes made of polymethyl methacrylate and glue them together with epoxy adhesive "Epicon" (trade name,
(manufactured by Dainippon Ink Co., Ltd.). Separately, a coagulating liquid supply device and a funnel-shaped holder having a coagulating liquid discharge port with a hole diameter of 4 mm and a hole length of 5 mm were manufactured from polymethyl methacrylate, and these were joined using a silicone rubber plate as a gasket to form a coagulating liquid as shown in the drawing. Got the nozzle. The tip of the thin tube of this coagulation nozzle and the coagulation liquid discharge port are on the same plane.

This was placed in a coagulation tank where a coagulation solution (1% sulfuric acid aqueous solution) was flowing quietly, and butadiene was added at a rate of 2 per minute.
A polymer latex (solid content: 38%) consisting of 35 parts of acrylonitrile, 19 parts of acrylonitrile, and 46 parts of styrene was introduced into the holder, and at the same time a coagulating liquid (1% aqueous sulfuric acid solution) was introduced into a coagulating liquid feeder at a rate of 3 per minute. .
As a result, the polymer latex was discharged from the thin tube and the coagulating liquid was discharged from the coagulating liquid discharge port, and as the two came into contact, the polymer latex became a lily-shaped aggregate, which was transferred to a solidification tank and the polymer was The temperature was raised to 92°C. When the solidified polymer particles were taken out and centrifugally dehydrated using a centrifugal dehydrator (centrifugal force is 600G), the moisture content of the obtained wet powder was 17.5%.
(dry base). This coagulation operation was continued for 100 hours, during which time the discharge conditions of the latex and coagulation liquid were very stable, and no nozzle clogging was observed.

Further, the bulk specific gravity of the dried powder obtained by sufficiently drying the obtained wet polymer powder was 0.45, the average particle size was 0.95 mm, and the amount passing through a 250 mesh standard sieve was 0.11% of the total. Compared to the powder obtained in Comparative Example 3 described later, the powder obtained in this example has extremely good dehydration properties, has a large bulk specific gravity, has a large average particle size, and has an extremely small amount of fine powder. It can be said to be an ideal powder.

Example 2 1000 stainless steel thin tubes with an outer diameter of 1.26 mm, an inner diameter of 0.90 mm, and a length of 50 mm were evenly inserted into a polycarbonate substrate with a thickness of 5 mm and a diameter of 190 mm, and both were fixed with epoxy adhesive "Epicon". Separately, a coagulating liquid supply device and a funnel-shaped holder having a coagulating liquid discharge port with a hole diameter of 2 mm and a hole length of 6 mm were manufactured from polycarbonate, and these were joined via a neoprene rubber O-ring to form a coagulating nozzle as shown in the drawing. I got it. The tip of the thin tube of this coagulation nozzle and the coagulation liquid discharge port are on the same plane.

This was set in a coagulation tank where a coagulation liquid (1% sulfuric acid aqueous solution) was flowing gently, and the same polymer latex as in Example 1 was introduced into the holder at a rate of 18 per minute, and at the same time, the coagulation liquid was introduced at a rate of 3.5 per minute. (1% aqueous sulfuric acid solution) was introduced into the coagulation liquid feeder. As a result, the polymer latex was vigorously discharged from the thin tube and solidified in the shape of a slow drop, so this was transferred to a solidification tank and the temperature of the polymer was raised to 92°C to solidify the polymer. Next, the solidified polymer particles were taken out from the solidification tank and centrifugally dehydrated using a centrifugal dehydrator (centrifugal force: 600G), and the moisture content of the obtained wet powder was 17.1% (dry base). This coagulation operation was continued for 8 hours, during which time the discharge conditions of the latex and coagulation liquid were very stable, and no nozzle clogging was observed. In addition, after sufficiently drying the obtained wet powder, we measured the powder physical properties and found that the bulk specific gravity of the dry powder was
0.47, the average particle size was 0.90 mm, and the amount passing through a 250-mesh standard sieve was 0.06% of the total.

Example 3 An outer diameter of 2 mm, an inner diameter of 1 mm, and a length of 50 mm are evenly distributed on a polymethyl methacrylate substrate with a thickness of 6 mm and a diameter of 150 mm.
Insert 100 thin tubes made of polymethyl methacrylate and secure them together with epoxy adhesive "Epicon". Separately, a coagulating liquid supply device with a coagulating liquid discharge port with a hole diameter of 4 mm and a hole length of 20 mm and a funnel-shaped holder were manufactured from polymethyl methacrylate, and these were joined using a silicone rubber plate as a gasket to form a coagulating nozzle as shown in the drawing. I got it. The tip of the thin tube of this coagulation nozzle and the coagulation liquid discharge port are on the same plane.

This was placed in a coagulation tank where the coagulation liquid (1% sulfuric acid aqueous solution) was flowing gently, and the same polymer latex as in Example 1 was introduced into the holder at a rate of 4 per minute, and at the same time the coagulation liquid (1% sulfuric acid aqueous solution) was introduced into the holder. The coagulation liquid was introduced into the coagulation liquid feeder at a rate of 25 per minute. As a result, both the polymer latex and the coagulating liquid were vigorously discharged from the nozzle into the coagulating tank, and the polymer latex coagulated in the shape of a drop. The solidified polymer is then transferred to a solidification tank.
After heating to 92°C to solidify the polymer particles, they were centrifugally dehydrated using a centrifugal dehydrator (centrifugal force: 600G) to obtain wet powder. The moisture content of the obtained wet powder was 18.8% (dry basis). This coagulation operation was continued for 30 hours, during which time the discharge conditions of the latex and coagulation liquid were stable, and no nozzle clogging was observed. Further, after sufficiently drying the obtained wet powder, the physical properties of the powder were measured, and the bulk specific gravity of the dry powder was 0.43, the average particle size was 0.91 mm, and the amount passing through a 250 mesh standard sieve was 0.15% of the total. In this example, Example 1
The production volume per tube has been doubled compared to the previous model.

Example 4 A coagulation nozzle identical to that used in Example 1 was manufactured except that the length of the capillary was 15 mm. Therefore, the thin tube of this coagulation nozzle is 20 mm from the coagulation liquid outlet.
mm protrudes. This was placed in a coagulation tank where a coagulation liquid (0.2% aluminum sulfate aqueous solution) was flowing gently, and a polymer latex (solid content 40 %) was introduced into the holder, and at the same time, coagulation liquid (0.2% aluminum sulfate aqueous solution) was introduced into the coagulation liquid supply device at a rate of 3 per minute.
As a result, the polymer latex was solidified in a good condition in a succulent shape, so it was transferred to a solidification tank and solidified by heating at 85°C. When the solidified polymer particles were dehydrated using a centrifugal dehydrator (centrifugal force is 600G), water was removed.
A wet flour containing 16.2% (dry basis) was obtained.
This coagulation operation was continued for 64 hours, during which time the discharge conditions of the latex and coagulation liquid remained stable.
No nozzle blockage was observed. Further, after sufficiently drying the obtained wet powder, the physical properties of the powder were measured, and the bulk specific gravity of the dry powder was 0.45, the average particle size was 1.06 mm, and the amount passing through a 250 mesh standard sieve was 0.03% of the total.

Example 5 A coagulation nozzle identical to that used in Example 1 was manufactured except that the length of the capillary was 43 mm. Therefore, the gap between the tip of the thin tube of this coagulation nozzle and the inner surface of the coagulation liquid supply device was 2 mm. Add this to the coagulation liquid (0.5
% magnesium sulfate aqueous solution) was placed in a coagulation tank where it was gently flowing, and 60 parts of butadiene was added at a rate of 2/min.
A polymer latex (35% solids) consisting of 13 parts of methyl methacrylate, 23 parts of styrene, and 4 parts of butyl acrylate was introduced into the holder at a rate of 3 parts per minute at the same time.
A coagulating liquid (0.5% magnesium sulfate aqueous solution) was introduced into the coagulating liquid supply device at a ratio of . As a result, the polymer latex discharged from the thin tube is carried by the flow of the coagulating liquid in the coagulating liquid supply device and flows as if being sucked into the coagulating liquid outlet, where it coagulates in a slow-flowing manner along with the coagulating liquid from the outlet. I spat it out. This was transferred to a solidification tank and the polymer particles were solidified by heating at 90°C, and then dehydrated using a centrifugal dehydrator (centrifugal force: 600G) to obtain a wet powder containing 18.0% moisture (dry base). This coagulation operation was continued for 48 hours, during which time the discharge conditions of the latex and coagulation liquid were stable and no nozzle clogging was observed. Further, after thoroughly drying the obtained wet powder, the physical properties of the powder were measured, and the bulk specific gravity of the dry powder was 0.47, the average particle size was 1.12 mm, and the amount passing through a 250-mesh standard sieve was less than 0.01% of the total.

Comparative Example 1 The same coagulation operation as in Example 2 was performed except that the coagulation liquid supply device was removed from the nozzle used in Example 2 so that no coagulation liquid was supplied from around the thin tube.
As a result, coarse lumps of the coagulated polymer were observed 30 seconds after the polymer latex was introduced into the holder, and the coarse lumps continued to occur thereafter, making it impossible to perform a good coagulation operation. Furthermore, when the nozzle was examined after the operation was completed, most of the capillaries were blocked.

Comparative Example 2 The same coagulation operation as in Example 3 was performed except that the coagulation liquid supply device was removed from the nozzle used in Example 3 so that no coagulation liquid was supplied from around the thin tube. As a result, the polymer latex introduced into the holder was expelled extremely vigorously from the thin tube, and the latex solidified into powder, which was transferred to a solidification tank92.
The polymer was solidified by heating to .degree. The obtained polymer slurry was dehydrated using a centrifugal dehydrator (centrifugal force: 600 G) to obtain a wet powder containing 31.7% water (dry base). Furthermore, after sufficiently drying the wet powder, the physical properties of the powder were measured, and the bulk specific gravity was 0.29, the average particle size was 0.21 mm,
The amount passing through the 250 mesh standard sieve was 2.26% of the total. This coagulation operation was continued continuously for 3 hours, and although no nozzle clogging was observed during this period, no powder with excellent powder properties was obtained.

Comparative Example 3 30g of a 1% aqueous sulfuric acid solution was put into an 80m2 container, and while stirring, 20g of the same polymer latex as in Example 1 was poured to prepare a coagulated slurry.
This method is a coagulation method that has been widely used in the past. After heating the slurry to 92°C to solidify the polymer particles, it was heated to a centrifugal dehydrator (the centrifugal force
600G). The moisture content of the obtained wet powder is 34%
(dry base), and the bulk specific gravity of the powder after drying is
0.32, the average particle size was 0.26 mm, and the amount passing through a 250-mesh standard sieve was 2.12% of the total.

[Brief explanation of drawings]

The drawing is a cross-sectional perspective view of an example of a latex coagulating nozzle used in the present invention. 1...Thin tube, 2...Substrate, 3...Holder, 4
. . . gasket, 5 . . . fastener, 6 . . . coagulation liquid supply device, 7 .

Claims (1)

[Scope of Claims] 1. When coagulating polymer latex, the latex can be discharged from a thin tube provided on the substrate as a nozzle for coagulating latex, and the coagulating liquid can be discharged from around the thin tube. A method for coagulating a polymer latex characterized by using a polymer latex having a structure. 2. The method for coagulating polymer latex according to claim 1, wherein the nozzle is a latex coagulating nozzle in which a substrate and a thin tube are fixed with an adhesive. 3. The method for coagulating polymer latex according to claim 1, wherein the nozzle is a latex coagulating nozzle in which a substrate and a thin tube are fixed by integral molding. 4. The method for coagulating polymer latex according to claim 1, wherein the substrate and the thin tube are fixed together by a polymerization reaction to form a nozzle for coagulating latex. 5. The method for solidifying a polymer latex according to claim 1, wherein the substrate and the thin tube are fixed to each other by cooling and solidifying the molten substance forming the substrate.