WO2004076072A1

WO2004076072A1 - Spray nozzle tip and method of manufacturing thermosetting ersin using the same

Info

Publication number: WO2004076072A1
Application number: PCT/JP2004/002108
Authority: WO
Inventors: Hiroshi Kanayama; Yoshio Yoshida; Kunio Sasaoka; Shinichiro Kajikawa
Original assignee: Mitsui Takeda Chemicals, Inc.
Priority date: 2003-02-25
Filing date: 2004-02-24
Publication date: 2004-09-10
Also published as: JPWO2004076072A1

Abstract

A spray nozzle tip having excellent swirl flow generating efficiency, and capable of increasing the spreading of the spray pattern of sprayed thermosetting resin, reducing the sizes of atomized liquid drops, reducing the entanglement of air bubbles, and spraying the thermosetting resin on a mold to provide a thin and uniform thermosetting resin-molded product with excellent mechanical strength, comprising a casing body in which a thermosetting resin flow passage is formed, an orifice part installed at the spray opening part of the casing body, a core part installed on the opposite side of the spray opening part side of the orifice part, and a swirl flow formation chamber formed between the orifice part and the core part and communicating with the orifice outlet of the orifice part. A swirl groove communicating with the inner peripheral wall of the swirl flow formation chamber in the tangential direction is formed in the orifice part in the vertical direction relative to the axis of the orifice outlet.

Description

TECHNICAL FIELD The present invention relates to a spray nozzle tip for producing a thermosetting resin by an airless spray molding method, and a method using the nozzle tip. The present invention relates to a method for producing a thermosetting resin, and a molded product obtained thereby. BACKGROUND ART For example, automobile interior decorations such as dashboards of automobiles, ie, instrument panels, require long-term heat resistance and light resistance. Thermosetting polyurethane resins are used in the field of interior decoration products that require such long-term heat resistance and light resistance.

As a method for molding such a thermosetting resin such as a thermosetting polyurethane, a so-called “airless spray molding method” technology has been conventionally proposed. In this method, a thermosetting resin is sprayed onto a pre-heated mold through a spray nozzle to form the thermosetting resin on the mold. However, in such an airless spray molding method, since the viscosity of the reaction mixture is relatively high, the atomization state of the reaction mixture changes greatly depending on the shape of the nozzle tip.

For this reason, Japanese Patent No. 29144522 (particularly, see FIGS. 1 to 3) As shown in Fig. 2, the orifice provided with the swirl chamber 23 and the swirl flow inlet 25 as shown in Fig. 2 enables high-viscosity fluids to be sprayed at a large spray angle, making it easy to atomize the resulting particles. Nozzle puyo spraying method is proposed.

Also, in Japanese Patent Application Laid-Open No. 9-75786 (particularly, see FIGS. 1 to 4), the vicinity of the spray port 27 of Patent No. 2914452 contains fine particles such as minerals. In order to prevent the nozzle from being worn due to the internal swirling motion of the fluid, a pressure spray nozzle and a spray method with a tapered part 6 of 20 to 70 ° near the spray port shown in Fig. 4 are proposed.

Further, Japanese Patent No. 2610308 (Japanese Patent Publication No. 7-83847) (especially, see page 3, column 5 to page 4, page 7, FIG. 2 to FIG. 6) In particular, on page 3, column 6, FIG. 2 to FIG. 7), a method for uniformly molding a polyurethane resin using a liquid reaction mixture of a polyol and an isocyanate using an airless spray molding method has been proposed. I have.

That is, in these Japanese Patent No. 2610308 and Japanese Patent Publication No. Hei 7-83847, a nozzle tip 101 as shown in FIG. 6 is used.

As shown in FIG. 6 (A), the nozzle tip 101 has an orifice portion at the nozzle opening 103 of the casing body 102 in which the flow path of the thermosetting resin is formed. Is provided. A core portion 105 is provided on the opposite side of the orifice portion 104 from the spray opening side.

At the base end of the orifice portion 104, a substantially conical surface 106 is formed, and a truncated conical portion 107 at the tip of the core portion 105 fits into the conical surface 106. Have been combined. As a result, between the orifice portion 104 and the core portion 105, a vortex flow forming chamber 110 communicating with the orifice outlet 108 of the orifice portion 104 is formed. ing.

Then, as shown in FIG. 6 (B), the core portion 105 is swirled along the outer circumference of the truncated conical portion 107 so as to spirally communicate with the vortex flow forming chamber 110. Grooves 1 1 and 2 are formed.

As a result, the thermosetting resin flows from the flow path of the casing main body 102 into the vortex flow forming chamber 110 through the swirl groove 112 of the core 105, thereby forming the vortex flow forming chamber 1 A vortex is generated in 10 and the thermosetting resin is sprayed almost uniformly in the shape of a bell from the orifice outlet 108 of the orifice section 104 onto the preheated mold surface. Molded articles can be obtained.

However, Japanese Patent No. 29144522 and Japanese Patent Application Laid-Open No. 9-757986 are merely an improvement of a nozzle used for a spray granulation method and the like. It is completely different from a spray nozzle tip for molding a thermosetting resin on a mold and a method for producing a thermosetting resin molded using the nozzle tip.

In other words, in the method disclosed in Japanese Patent No. 29144522, the swirling force of the fluid that is guided from the swirl chamber inlets 2.5 to the cylindrical swirl chamber 23 and reaches the mist chamber 27 is attenuated. As a result, the spray angle ("spray pattern" in the present invention) is narrowed. Also, Japanese Patent Application Laid-Open No. Hei 9-197957 describes that nozzles near the spray port 27 of Japanese Patent No. 2945452 are worn due to internal swirling motion of a fluid containing fine particles such as minerals. In order to prevent this, only a 20 to 70 ° taper portion 6 is provided in the vicinity of the spray port shown in FIG. 4, which is substantially similar to that of Japanese Patent No. 29144522. It has no effect in preventing the fog angle from becoming narrower.

Further, in the method disclosed in Japanese Patent No. 2610308, Japanese Patent Publication No. 7-83847, a swirl groove 1 1 2 force communicating with the swirl flow forming chamber 110 is used. 5 of Due to the spiral shape along the outer circumference of the frustoconical portion 107, the injected resin vector is dissipated into the vector in the turning direction and the vector in the orifice outlet direction. As a result, the swirl force of vortex generation is reduced. Therefore, the spread of the thermosetting resin sprayed from the orifice outlet 108 becomes narrower, and the atomized droplets become relatively large. Becomes bigger.

Therefore, the thickness of the thermosetting resin sprayed on the mold becomes thicker and non-uniform, and as a result, the mechanical properties become non-uniform.

In addition, since the force is dispersed between the vector in the swirling direction and the vector in the direction toward the orifice outlet, in order to obtain sufficient swirling force, a burden is imposed on the liquid feed pump connected to the nozzle for spraying. This affects the life of the equipment.

Such problems are particularly significant in the field of car dashboards, that is, in the field of car interior decorations such as instrument panels, because they are required to be thin, have high mechanical strength, and are required to be mass-produced. It is. In view of the above situation, the present invention has a high efficiency of eddy current generation, a large spread of a spray pattern of a thermosetting resin to be sprayed, and a small atomized droplet and entrapment of bubbles. A spray nozzle tip capable of spraying a thermosetting resin onto a mold in a small amount, resulting in a thin, uniform, thermosetting resin molded product having excellent mechanical strength; and An object of the present invention is to provide a method for producing a thermosetting resin using a nozzle tip. Disclosure of the invention The present invention has been made in order to achieve the above-mentioned problems and objects in the prior art, and the spray nozzle tip of the present invention is characterized by spraying a thermosetting resin on a mold. A spray nozzle tip used in an airless spray molding method for molding a thermosetting resin on a mold,

A case body in which the spray nozzle tip is formed with a flow path of the thermosetting resin;

An orifice portion provided at a spray opening of the casing body; a core portion provided at a side opposite to the spray opening side of the orifice portion; and an orifice portion formed between the orifice portion and the core portion. Vortex forming chamber communicating with the orifice outlet of

A swirl groove is formed in the orifice portion in a direction perpendicular to the axis of the orifice outlet and tangentially communicating with the inner peripheral wall of the swirl flow forming chamber, and the swirl flow forming chamber moves toward the orifice outlet. It is characterized in that it has a conical shape whose diameter gradually decreases.

In addition, the method for producing a thermosetting resin of the present invention is an airless spray molding method for forming a thermosetting resin on a mold by spraying the thermosetting resin on the mold using a spray nozzle tip. A method for producing a thermosetting resin using

An orifice portion provided at a spray opening of the casing body; a core portion provided at a side opposite to the spray opening side of the orifice portion; and an orifice portion formed between the orifice portion and the core portion. Orifice A swirl formation chamber communicating with the chair outlet,

A swirl groove is formed in the orifice portion in a direction perpendicular to the axis of the orifice outlet and tangentially communicates with the inner peripheral wall of the swirl flow forming chamber.

The swirling flow forming chamber has a conical shape whose diameter gradually decreases toward the orifice outlet.

With this configuration, the thermosetting resin flows from the flow passage of the casing body into the swirl flow forming chamber through the swirl groove formed in the orifice portion, thereby generating a swirl flow in the swirl flow forming chamber. Thus, the thermosetting resin is uniformly sprayed in a bell shape on the surface of the preheated mold from the orifice outlet of the orifice portion, and a thermosetting resin molded product is obtained.

At this time, the swirl groove is formed so as to communicate in a direction perpendicular to the axis of the orifice outlet and tangentially with the inner peripheral wall of the swirl flow forming chamber, so that the thermosetting resin is in the same plane. The turning force is generated so that the turning of the.

Therefore, since the swirling force does not decrease, the efficiency of vortex generation is high, the spread of the spray pattern of the thermosetting resin sprayed becomes large, and the force of the atomized droplets is small, and There is little entrainment, and the thermosetting resin can be sprayed on the mold.

As a result, it is possible to obtain a thermosetting resin molded article that is thin, uniform, and excellent in mechanical strength, and it is also possible to generate a vortex with a small discharge amount and spray the liquid, thereby burdening a device such as a liquid feeding pump. However, the life of the device is greatly improved. Further, the present invention is characterized in that the cross-sectional area of the turning groove is in a range of 0.05 to 0.5 mm ² .

If the cross-sectional area of the swirl groove is within such a range, the pressure in the swirl groove portion will increase, so that an excessive load is not applied to the liquid feed pump, and the force of the swirl flow forming chamber is reduced. The spray pattern is spread evenly without any decrease in the swirling force inside.

Further, in the present invention, it is characterized in that the length L1 of the orifice outlet is in the range of 0.01 to 0.5 mm.

If the length of the orifice outlet is 1 ^ in such a range, the spray pattern becomes too wide and the droplets do not scatter, and the swirling force generated in the vortex flow formation chamber is attenuated. Don't end up! / ,.

Further, the present invention is characterized in that the diameter of the orifice outlet is in the range of 0.1 to 2.0 mm, more preferably in the range of 0.2 to 1.5 mm.

If the diameter of the orifice outlet is within such a range, the pressure at the orifice outlet will increase, and no excessive load will be applied to the liquid feed pump, and a uniform spray pattern with a low force will be obtained.

Further, the present invention is characterized in that the vortex flow forming chamber includes a conical portion communicating with the orifice outlet, and a conical angle 6i of the conical portion is in a range of 30 to 120 °.

If the conical angle of the conical portion is in such a range, a good spray pattern can be obtained without the swirling force generated in the swirl groove being relatively attenuated in the swirl flow forming chamber. Further, in the present invention, the height h of the vortex forming chamber is in the range of 0.5 to 3.0 mm.

If the height h of the vortex formation chamber is in such a range, the rectification effect of the liquid in the vortex formation chamber will not be reduced because the size of the vortex formation chamber will be small, and a uniform mist pattern will be obtained. With this, the swirl forming chamber becomes unnecessarily large and the swirling force obtained in the swirl groove is attenuated, so that the spread of the spray pattern is not reduced. Further, in the present invention, the length L overlapping the core portion of the turning groove. Is less than 0.5 mm Above, more preferably, in the range of 0.5 to 3.0 mm. If the length of the swirl groove overlaps with the core in such a range, the flow of the mixed liquid in the swirl groove is adjusted, sufficient swirl strength is obtained, and the pressure in the swirl groove increases, and The pump is not overloaded.

Further, the present invention is characterized in that 1 to 6 turning grooves are formed. If there is a swirl groove in such a range, the flow from each groove does not interfere with each other, the flow of the liquid in the vortex forming chamber is adjusted, and a uniform spray pattern can be obtained. Further, the present invention is characterized in that the orifice portion, the core portion, and the casing main body are configured to be detachably attachable to each other.

As described above, since the orifice portion, the core portion, and the casing main body are configured to be detachable, by removing them from the nozzle main body, the inside of the nose tip can be easily cleaned.

Further, the present invention is characterized in that the droplets sprayed from the orifice outlet have an average particle diameter (ASTM-E799-92) of 95 μπι or less. If the average particle size of the droplet sprayed from the orifice outlet falls within such a range, air bubbles are less likely to be trapped on the mold, and the mechanical properties are not reduced. In addition, the thickness distribution of the thermosetting resin applied on the mold is reduced, and the mechanical properties in the same molded product become uniform. Furthermore, since the droplets are not scattered, the productivity is improved and the working environment is not deteriorated.

Further, the method for producing a thermosetting resin of the present invention is characterized in that the thermosetting resin is sprayed onto a mold at a discharge rate of 3 to 20 cc / sec.

If the ejection amount of the thermosetting resin falls within such a range, the productivity can be reduced and the luster can be uniformly applied to the mold.

Further, the method for producing a thermosetting resin of the present invention, wherein the thermosetting resin is at least Is a thermosetting polyurethane resin comprising a polyisocyanate compound and an active hydrogen compound.

This makes it uniform, thin, and mechanically strong, for example, as a material for automotive dashboards, i.e., film products for automotive interior decorations such as instrument panels, and artificial and general materials such as artificial leather that forms the seat surface of chairs. It is possible to obtain a polyurethane molded product excellent in quality. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of an embodiment of the nozzle tip of the present invention.

FIG. 2 is an end view of the nozzle tip of FIG. 1 as viewed from the direction A (coating direction). FIG. 3 is an end view of the nozzle tip of FIG. 1 viewed from the direction B (the direction opposite to the application direction).

FIG. 4 is a partially enlarged view showing details of an orifice portion of the nozzle tip of FIG.

FIG. 5 is a partially enlarged view of the orifice portion along the line C-C of the nozzle tip of FIG. .

FIG. 6 (A) is a longitudinal sectional view of a conventional spray nozzle, and FIG. 6 (B) is a partially enlarged view in the DD direction of FIG. 6 (A).

FIG. 7 is a diagram schematically showing the spray angle in the example of the present invention.

FIG. 8 is a longitudinal sectional view of the entire nozzle tip of the comparative example.

FIG. 9 is a longitudinal sectional view of a casing body of a nozzle tip of a comparative example.

FIG. 10 is a longitudinal sectional view of a core portion of a nozzle tip of a comparative example.

FIG. 11 is a partially enlarged view similar to FIG. 5 of the nozzle tip of the comparative example. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments (examples) of the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a longitudinal sectional view of an embodiment of the nozzle tip of the present invention, FIG. 2 is an end view of the nozzle tip of FIG. 1 viewed from the direction A (application direction), and FIG. 3 is B of the nozzle tip of FIG. Fig. 4 is a partially enlarged view showing the details of the orifice part of the nozzle tip in Fig. 1, and Fig. 5 is a C-C line of the tip in Fig. 1. FIG. 4 is a partially enlarged view of an orifice portion in FIG.

In FIGS. 1 to 3, 10 indicates the nozzle tip of the present invention as a whole. As shown in FIG. 1, the nozzle tip 10 includes a casing body 12, and a thermosetting resin flow path 14 is formed inside the casing body 12. Although not shown, the flow path 14 is connected to a liquid feed pump for separately feeding a thermosetting resin. The base end 11 of the casing body 12 has a small diameter and is formed with a male screw, so that the casing body 12 can be detachably attached to a nozzle body (not shown).

An opening 18 is provided at the top and bottom of the tip end 16 of the casing body 12, and in FIG. 1, the spray opening 20 is located on the lower side (application side). A flange 22 protrudes inward from the spray opening 20, thereby forming a step 24. An orifice portion 26 is detachably fitted in the step portion 24.

On the other hand, a core portion 28 is disposed on the side opposite to the application side of the opening 18, that is, on the side opposite to the spray opening side of the orifice 26. As shown in FIG. 1, the core portion 28 includes a core portion main body 30 and a fitting portion 32 having a larger diameter than the core portion main body.

A male screw 32 a is screwed around the outer periphery of the fitting portion 32, and is screwed with a female screw 34 a formed on the inner wall 34 opposite to the coating side of the opening 18. Thus, the core portion 28 can be detachably attached to the opening 18 of the casing body 12.

As shown in FIG. 3, a hexagonal tool engaging recess 36 is formed in the core portion main body 30. By locking the tool in the tool engaging recess 36, the core Part 28 can be removed.

In addition, since the orifice portion 26, the core portion 28, and the casing main body 12 are detachably attached to the nozzle tip, the inside of the nozzle tip can be easily cleaned. In particular, when the thermosetting resin is a thermosetting polyurethane resin composed of at least a polyisocyanate compound and an active hydrogen compound, the reaction is fast, and the cured polyurethane resin in the nozzle is easily clogged. Suitable for washing.

In this case, the orifice portion 26 and the core portion 28 can be made of separate members, but can also be formed integrally.

Further, the core body 30 of the core 28 has an outer diameter smaller than the inner diameter of the opening 18 of the casing body 12, and as a result, as shown in FIG. Inside 18, an annular supply chamber 38 is formed.

The orifice portion 26 is formed between the orifice portion 26 and the core body 30 on the application side of the orifice portion 26, as shown in FIGS. 1, 2, and 4. A swirl flow forming chamber 40 communicating with the outlet 44 is formed.

The inner diameter of the vortex forming chamber 40 must be smaller than the outer diameter of the core body 30. I have. The swirl flow forming chamber 40 includes a base end 42 on the side of the core body 30 and a conical portion 46 formed so that its diameter gradually decreases toward the orifice outlet 44. ing.

Also, as shown in FIGS. 1, 4 and 5, the end face 48 of the orifice section 26 on the core section 28 side is perpendicular to the axis 50 of the orifice outlet 44, and A swirl groove 54 communicating with the tangential direction is formed in the circumference of the inner peripheral wall 52 of the base end portion 42 of the vortex flow forming chamber 40. In this embodiment, four swirl grooves 54 are formed at intervals of 90 °.

In this case, the cross-sectional shape of the turning groove 54 may have any shape as long as the effect of the present invention is not impaired, and examples thereof include a semicircle and a square.

Further, the number and arrangement of the swirl grooves 54 are not particularly limited, but it is preferable that turbulence does not occur in the swirl flow forming chamber 40, and preferably 1 to 6, and Preferably, the number is in the range of 2 to 5. In other words, if the number is more than six, the flows from the swirl grooves 54 interfere with each other, the flow of the liquid in the swirl flow forming chamber 40 is not adjusted, and a uniform spray pattern cannot be obtained. When a plurality of swirling grooves 54 are formed, it is preferable to arrange them evenly in order to prevent turbulence.

Further, as shown in FIG. 4, the cross-sectional area force of each of the turning grooves 54 is preferably in the range of 0.05 to 0.5 mm ² , more preferably in the range of 0.05 to 0.3 mm ² . Preferably it is.

That is, when the cross-sectional area of the swirl groove 54 is smaller than 0.05 mm2, the pressure in the swirl groove 54 increases and an excessive load is applied to the liquid feed pump. On the other hand, if the cross-sectional area Ai of the turning groove 54 is larger than 0.5 mm2, This is because the swirling force in the forming chamber 40 decreases and the spray pattern does not spread. Furthermore, as shown in FIG. 5, the length L ₂ overlapping with the core body 30 of the turning groove 54 is the core portion 28 is preferably not 0. 5 mm or more.

That is, if the L2 force ^s is smaller than 0.5 mm, the flow of the mixed liquid in the swirl groove 54 is not adjusted, and a sufficient swirl strength cannot be obtained.

Further, the length L ₂ forces overlapping with the core body 30 of the turning groove 54 core portion 28 from 0.5 to 3. It is preferably in the range of Omm.

That is, if it is larger than L ₂ force ^s 3. Omm, the pressure in the swirl groove 54 increases, and an excessive load is applied to the liquid feed pump.

Further, as shown in FIG. 4, the length L1 of the orifice outlet 44 is preferably in the range of 0.01 to 0.5 mm, more preferably 0.07 to 0.3 mm.

That is, if the length Li of the orifice outlet 44 is smaller than 0.01 mm, the spray pattern becomes too wide and the droplets scatter. On the other hand, if the length Li force of the orifice outlet 44 is larger than 0.5 mm, the swirl force generated in the vortex flow forming chamber 40 is attenuated.

Further, as shown in FIG. 4, the height h of the vortex forming chamber 40 is preferably in the range of 0.5 to 3.0 mm, more preferably 0.5 to 2.0 mm. .

That is, if the height h of the vortex forming chamber 40 is shorter than 0.5 mm, the vortex forming chamber 40 becomes smaller, the liquid rectification effect in the vortex forming chamber 40 is reduced, and a uniform spray pattern is obtained. It is not possible. On the other hand, if the height h of the vortex forming chamber 40 is larger than 3.Omm, the vortex forming chamber 40 becomes unnecessarily large, the swirling force obtained in the swirl groove 54 is attenuated, and the spread of the spray pattern is reduced. Because It is.

In addition, as shown in FIG. 4, the cone angle θι of the conical portion 46 of the vortex flow forming chamber 40 is preferably in the range of 30 to 120 °, and more preferably in the range of 60 to 110 °. Is preferred. '

That is, the cone angle of the conical portion 46 Θ]; With this range, the swirling force generated in the swirl groove 54 is not relatively attenuated in the swirl flow forming chamber 40, and a good mist pattern can be obtained.

As shown in FIGS. 4 and 5, the diameter _φι force of the orifice outlet 44 is preferably in the range of 0.1 to 2.0 mm, more preferably in the range of _0.2 to 1.5 mm.

That is, when the diameter φι of the orifice outlet 44 becomes smaller than 0.1 mm, the pressure at the orifice outlet 44 increases, and an excessive load is applied to the liquid feed pump. On the other hand, if the diameter _{φι of the} orifice outlet 44 is larger than 2. Omm, a uniform spray pattern cannot be obtained.

Further, in this case, the average particle diameter (AS TM-E 799 -92) of the droplet sprayed from the orifice outlet 44 is preferably 95 pm or less, more preferably in the range of 20 to 95 μηι.

That is, if the average particle diameter of the droplets sprayed from the orifice outlet 44 is larger than 95 μπι, bubbles are likely to be wound on the mold and the mechanical properties are reduced. In addition, the thickness distribution of the polyurethane resin applied on the mold also becomes large, and the mechanical properties within the same molded product become non-uniform. Furthermore, if the average particle diameter of the droplet sprayed from the orifice outlet 44 is less than 2 μμπι, the droplet scatters, which lowers the productivity and worsens the working environment. In this case, in this specification, the average particle diameter of the liquid droplet is measured at 10 cm from the orifice outlet 44 by using a laser light scattering type particle size distribution measuring apparatus as described in ASTM-E799-92. It shows the value measured by the measurement method performed according to.

Further, it is desirable that the thermosetting resin is sprayed onto a mold at a discharge rate of preferably 3 to 20 cc / sec, more preferably 5 to 15 cc / sec.

That is, if it is smaller than 3 cc / sec, the productivity is lowered, and if it is larger than 20 cc / sec, the resin cannot be uniformly applied to the mold.

The thermosetting resin (mixed liquid) used in the present invention is preferably a thermosetting polyurethane resin composition comprising at least a polyisocyanate compound (A) and an active hydrogen compound (B). .

As the polyisocyanate compound (A) and the active hydrogen compound (B), any of those generally used in the production of thermosetting polyurethane resins can be used.

However, in this case,

• An isocyanate component (solution A) containing at least a polyisocyanate compound (A) and containing NCO groups;

· Active hydrogen-containing polyol component (solution B) containing at least active hydrogen compound (B);

It is desirable to use a thermosetting resin composition in which is mixed.

In this case, the viscosity of the thermosetting resin composition is preferably in the range of 10 to 500 OmPas, more preferably 15 to 2000 mPas. Some are preferred.

That is, when the viscosity of the thermosetting resin composition is less than 10 mPa · s, the amount of the scattered droplets increases, and the productivity decreases as the working environment decreases. On the other hand, if the viscosity of the thermosetting resin composition is greater than 500 mPa · s, the pressure increases and an excessive load is applied to the liquid sending pump.

Further, as the isocyanate component (Solution A), any one can be used as long as it is used in the production of ordinary ordinary thermosetting polyurethane resin.

In this case, as the isocyanate component (Solution A), for example, • Tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), polymeric MDI (PMDI), xylylene diisocyanate ( XDI), aromatic polyisocyanates such as tetramethyl ^^ xylylene diisocyanate (TMXDI), 1,5-naphthalenediisocyanate (NDI),

'Aliphatic polyisocyanates such as hexamethylene diisocyanate (HDI),' Isophorone diisocyanate (IPDI), hydrogenated XDI (H6XDI), hydrogenated tolylene diisocyanate, hydrogenated MDI (H12MDI), etc. An alicyclic polyisocyanate,

• Carposimid-modified polyisocyanate and isocyanurate-modified isocyanate

And the like.

These may be used alone or in combination. Further, if necessary, it can also be used as an adduct or a prepolymer which is partially urethane-modified with an active hydrogen compound.

On the other hand, as the polyol component (liquid B), any one can be used as long as it is used in the production of ordinary ordinary thermosetting polyurethane resin.

As such a polyol component (Solution B), for example, at least It is composed of a long-chain polyol that forms a soft segment of a urethane resin, and a chain extender that forms a hard segment, a crosslinking agent that forms a crosslinking point, and the like can be used as necessary. These may be used alone or in combination. Further, the polyurethane resin composition used in the present invention may further contain, if necessary, additives such as a stabilizer, a urethanization catalyst, a pigment, a thixotropic agent, an antifoaming agent, and a flame retardant. . These additives may be contained in any of the isocyanate component (Solution A) and the polyol component (Solution B) as long as the effects of the present invention are not impaired. .

In the nozzle tip 10 of the present invention configured as described above, the mixed liquid of the thermosetting resin mixed in advance by the mixer or the like is formed by the swirl formed in the orifice portion 26 from the flow path 14 of the casing body 12. The fluid flows into the vortex forming chamber 40 through the groove 54.

As a result, a vortex is generated in the vortex forming chamber 40, and the thermosetting resin is sprayed almost uniformly in a bell shape from the orifice outlet 44 of the orifice part 26 onto the preheated mold surface. A thermosetting resin molded product is obtained.

At this time, the swirl groove 54 communicates in a direction perpendicular to the axis 50 of the orifice outlet 44 and tangentially to the circumference of the inner peripheral wall 52 of the swirl flow forming chamber 40. Therefore, a turning force is generated so that the thermosetting resin turns in the same plane.

Therefore, since the swirling force does not decrease, the efficiency of eddy current generation is high, the spread of the mist pattern of the thermosetting resin to be sprayed becomes large, and the atomized droplets are small and bubbles are generated. The thermosetting resin can be sprayed onto the mold without any entrainment.

As a result, a thin, uniform, thermosetting resin molded product with excellent mechanical strength is obtained. In addition, the vortex can be generated and sprayed at a low discharge rate, so that no load is placed on the equipment such as the liquid feed pump, and the life of the equipment is greatly improved.

In the present application, the “molded article” is a thermosetting resin obtained by an airless spray molding method in which a thermosetting resin is sprayed on a mold to form the thermosetting resin on the mold. Yes, it has a specific shape and thickness depending on the application.

For example, interior decoration parts of vehicles such as vehicles, ships, and aircrafts, stores, offices, other architectural interior parts, and general and office furniture.

The use, shape, and thickness of these molded products are not particularly limited as long as the effects of the present invention are not impaired, but, for example, an automobile instrument panel (instrument panel), which is an interior decorative part for a vehicle, and the like. Since the skin layer is required to have a thickness of about 0.3 to 2.0 mm and a resin having uniform mechanical properties, it is obtained by a molding method using the spray nozzle of the present invention. The molded article to be used is preferably used.

In addition, artificial leather and the like forming the seating surface of chairs, which are general and office furniture, are also required to have a resin thickness of about 0.5 to 5.0 mm and uniform mechanical properties. Therefore, a molded article obtained by the molding method using the spray nozzle of the present invention is suitably used. Example

Examples 1 to 7

Using the spray nozzle tip according to the present invention, a thermosetting polyurethane composition was spray-molded under the following conditions. (1) Measurement method

(1-1) Viscosity measurement method

Isocyanate (Solution A) and an active hydrogen compound (Solution B) to which no urethanation catalyst was added were mixed, kept at the reaction temperature for 3 hours, and measured using a B-type viscometer.

(1-2) Average particle size

According to ASTM-E 799-92, the volume average particle diameter of the droplet at a distance of 10 cm from the orifice outlet 44 was measured.

(1-3) thickness measurement method

The thickness of the molded article was measured using calipers according to JIS K7130. (1-4) Specific gravity measurement method

The density of the molded article was measured by using “Underwater displacement density measuring device ED-120T” manufactured by Mirage Trading Co., Ltd.

(2) Spray nozzle tip

Table 1 shows the specifications of the nozzle tip.

(3) Details of raw materials

(3-1) Isocyanate (Α solution)

Prepolymer in which polycyclic aliphatic polyisocyanate is partially urethane-modified with polyether polyol: NCO = 26.0%, viscosity = 340 Pas (25 ° C), specific gravity = 1.14 ( (25 ° C)

(3-2) Active hydrogen compound (Solution B)

Resin pre-mixer pre-mixed with polyether polyol, chain extender, pigment, and urethanization catalyst and dehydrated at 100 ° C and 1 OmmHg under reduced pressure for 1 hour: Average hydroxyl value = 287 mg—KOH / g, viscosity = 2000 Pa · S (25 ° C), Specific gravity 2 1.06 (25 ° C)

(3-3) Liquid A / liquid B mixed viscosity

Solution A and solution B containing no urethanization catalyst were mixed under the condition of NCOZOH (equivalent ratio) = 1.10. Viscosity = 1243 mPa-s (25.C), 208 mPa-s (70.C).

(4) Molding of polyurethane resin

The isocyanate component (Solution A) and the active hydrogen compound (Solution B) are sent from the stirring tank, which is kept at 70 ° C, to the mixing head through the liquid sending line, which is kept at 70 ° C by the sending pump. The liquid is mixed by collision.

After that, it is further mixed by a line mixer, atomized by a nozzle tip, and sprayed on a mold.

After 3 minutes from the completion of spraying, confirm that the polyurethane composition sprayed on the mold is sufficiently cured, and then release the mold. '

The flow rate ratio between the solution A and the solution B was such that the NOH in the solution A and the OH amount in the solution B were NCO / OH (equivalent ratio) = 1.0.

Table 1 shows the molding conditions.

Note: In Table 1, “spray pattern angle” indicates the angle α between the vertical direction of the nozzle and the outermost spray line of the mist, as shown in Figure 7.

Comparative Examples 1-2

In the same manner as in Examples 1 to 7, the thermosetting polyurethane composition was subjected to spray molding. However, as shown in Table 1, the conditions were out of the scope of the present invention. The results are shown in Table 1. Comparative Example 3 Using a nozzle tip having a spiral swirl groove shown in FIGS. 8 to 11 and Table 1, a thermosetting polyurethane composition was spray-molded under the following conditions.

Table 1 shows the results. It can be seen that the specific gravity of the molded article of the comparative example is smaller than that of the example. The difference in specific gravity is apparently small, but when these molded products are pulled, the strength of the part where bubbles are present is extremely reduced. Becomes larger.

Table 1 Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Comparative Example 2 Comparative Example 3 Unit

Structure Fig. 5 Fig. 1-5 Fig. 5! Fig. 5 Fig. 1-5 Fig. 5 Fig. 1-5 Fig. 1-5 Fig. 1-5 Fig. 1-5 Fig. 8-11

0.04 0.05 0.10 0.10 0.10 0.10 0.3 0,5 0.6 0.09

A, cross-sectional area of turning groove mm2

No 0.01 0.01 0.07 0.1 0.1 0.1 0.3 0.5 0.6 1.0

L, length of orifice outlet mmZ

Z

0.09 0.35 0.6 0.8 0.8 0.8 1.4 2 2.2 1.07 Mouth diameter mm2

Φ out of orifice

'

Θ, cone angle ° 25 30 60 90 90 90 110 120 130 90 Shape 0,4 0.5 1 1.6 1.6 1.6 2 3 4 3.0 h Height of vortex formation chamber mm

0,4 0.5 1 1.4 1.4 1.4 2.2 3 0.4 1.9 Length of swivel groove mm

1 1 2 4 4 4 5 6 8 Z Number of turning grooves

0,5 3 7 12 10 8 15 20 25 12 Discharge: E cc / sec

Solution temperature (Solution A / Solution B) ° C 70/70 <— «—

Article-

<~

Case Mold temperature. C 70 * — one

Fluid pressure (A / B) MPa 20/20 20/20 10/10 10/10 7/7 5/5 2/2 0.8 / 0.8 0.8 / 0.8 10/10 Use isocyanate A-1

For one

Hara

Material Active hydrogen compound B-1

Distance between orifice outlet and measurement position mm 100

Grain One *-~

Child 17 20.1 40 51.9 59.1 89.2 90.3 94.9 105.8

Average particle size-special

Sex

Frost pattern angle 11 15 32 44.3 44.2 37 60.7 89.4 110 20.6 Average thickness mm 0.18 0.20 0.23 0.24 0,24 0.25 0.28 0.29 0.31 0.24 Tree

Fat

Standard deviation mm 0.018 0.018 0.020

Object 0.022 0.030 0.041 0.043 0.057 0.086 0.125

Specific gravity 11 1.042 1.039 1.037 1.033 1.035 1.030 1.026 1.022 1.011 0.998

In the above-described embodiment, an example in which a polyurethane resin is used as a thermosetting resin has been described. However, the present invention is applied to other thermosetting resins such as a polyurethane resin, a polyurethane resin, an unsaturated polyester resin, and an epoxy resin. It is also possible.

Further, in the above embodiment, the turning groove 54 is formed on the end surface 48 of the orifice portion 26 on the core portion 28 side, but the turning groove 54 may be provided on the core portion 28 side. .

The preferred embodiment of the present invention has been described above, but the present invention is not limited to this, and various changes can be made without departing from the object of the present invention.

(The invention's effect)

According to the present invention, the thermosetting resin flows from the flow path of the casing main body into the swirl flow forming chamber through the swirl groove formed in the orifice portion, whereby a swirl is generated in the swirl flow forming chamber, and the orifice is formed. The thermosetting resin is sprayed uniformly in the shape of a bell on the preheated mold surface from the orifice outlet of the section, and a thermosetting resin molded product is obtained.

At this time, since the swivel groove is formed so as to communicate in a direction perpendicular to the axis of the orifice outlet and in a tangential direction with the inner peripheral wall of the vortex flow forming chamber, the thermosetting resin is formed in the same plane. The turning force is generated so that the turning of the. Therefore, the swirling force is not attenuated, so that the vortex generation efficiency is high, the spread of the spray pattern of the thermosetting resin to be sprayed is widened, and the atomized droplets are small, and the bubbles are trapped. The thermosetting resin can be sprayed on the mold.

As a result, a thin, uniform thermosetting resin molded product with excellent mechanical strength is obtained. Vortex flow can be generated and sprayed at a low discharge rate, so that there is no significant burden on the equipment such as the liquid feed pump and the life of the equipment is greatly improved. This is an extremely excellent invention having a unique function and effect.

Claims

The scope of the claims

1. A spray nozzle chip used in a airless spray molding method for molding a thermosetting resin on a mold by spraying the thermosetting resin on the mold,

A casing body in which the spray nozzle tip is formed with a flow path of the thermosetting resin;

An orifice portion provided at the fog opening of the casing body; a core portion provided at a side opposite to the spray opening side of the orifice portion; and the orifice formed between the orifice portion and the core portion. A swirl forming chamber communicating with the orifice outlet of the section.

A swirl groove is formed in the orifice portion in a direction perpendicular to the axis of the orifice outlet and tangentially communicating with the inner peripheral wall of the swirl flow forming chamber. The swirl flow forming chamber faces the orifice outlet. A spray nozzle tip having a conical shape whose diameter gradually decreases.

2. The spray nozzle tip according to claim 1, wherein the cross-sectional area Ai of the swirl groove is in a range of 0.05 to 0.5 mm2.

3. The spray nozzle tip according to claim 1, wherein a length L i of the orifice outlet is in a range of 0.01 to 0.5 mm.

4. The spray tip according to claim 1, wherein a diameter φι of the orifice outlet is in a range of 0.1 to 2.0 mm. 5. The vortex formation chamber has a conical portion communicating with the orifice outlet, the cone angle θι of the conical portion is in the range of 30 to 120 °, and the height h of the vortex flow formation chamber is 0. 5 to 3. ◦ in the range of mm, length L ₂ forces overlapping with the core portion of the turning groove 0.

The spray nozzle tip according to any one of claims 1 to 4, wherein the spray nozzle tip is not less than 5 mm.

6. The spray nozzle tip according to claim 1, wherein 1 to 6 swirl grooves are formed.

7. The method according to any one of claims 1 to 6, wherein the average particle diameter (AS TM—E 799—92) of the droplet sprayed from the orifice outlet is in the range of 95 μηι or less. Spray nozzle tip.

8. A thermosetting resin manufacturing method using an airless spray molding method in which a thermosetting resin is formed on a mold by spraying the thermosetting resin on the mold using a spray nozzle tip. And

An orifice portion provided at a spray opening of the casing main body, and a core portion provided at a side opposite to the spray opening side of the orifice portion, A swirl forming chamber formed between the orifice portion and the core portion and communicating with an orifice outlet of the orifice portion;

A swirl groove is formed in the orifice portion in a direction perpendicular to the axis of the orifice outlet and tangentially communicating with the inner peripheral wall of the vortex flow forming chamber.

The vortex forming chamber has a conical shape whose diameter gradually decreases toward the orifice outlet;

Thermosetting characterized by spraying a thermosetting resin onto a mold so that the average particle diameter (ASTM-E 799-92) of the droplets sprayed from the orifice outlet is within a range of 95 μπι or less. Method for producing conductive resin.

9. The method for producing a thermosetting resin according to claim 8, wherein the thermosetting resin is sprayed onto a mold at a discharge rate of 3 to 20 cCZsec.

10. The thermosetting resin according to any one of claims 8 to 9, wherein the thermosetting resin is a thermosetting polyurethane resin comprising at least a polyisocyanate compound and an active hydrogen compound. Production method.

11. The method for producing a thermosetting resin according to claim 8, wherein a cross-sectional area of the turning groove is in a range of 0.05 to 0.5 mm 2.

12. The method for producing a thermosetting resin according to any one of claims 8 to 11, wherein the length of the orifice outlet is in the range of Li force of 0.01 to 0.5 mm.

13. The method for producing a thermosetting resin according to claim 8, wherein a diameter φι of the orifice outlet is in a range of 0.1 to 2. Omm.

14. The vortex forming chamber has a conical portion communicating with the orifice outlet, the cone angle force S of the conical portion is in the range of 30 to 120 °, and the height h of the vortex forming chamber is 0. 5-3. the range of Omm, thermoset as claimed in any one of claims 8 or al 1 3, characterized in that in the pivot than the length L ₂ force 0. 5 mm overlapping with the core portion of the groove Method for producing conductive resin.

15. The method for producing a thermosetting resin according to any one of claims 8 to 14, wherein 6 to 6 turning grooves are formed.

1 6. A molded product obtained by an airless spray molding method in which a thermosetting resin is formed on a mold by spraying the thermosetting resin on the mold.

The thermosetting resin comprises a thermosetting polyurethane resin comprising at least a polysocyanate compound and an active hydrogen compound;

A thermosetting polyurethane molded product obtained by spray molding using the spray nozzle tip according to claim 1.