JP2003170422A - Method for supplying mixing reaction curable material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To supply a main agent of a mixing reaction curable material into a mixing chamber while reducing the mixing of air bubbles with the main agent, to make it possible to use a mixture obtained by the mixing with a curing agent without generating the adverse effect caused by the mixing with air bubbles, and to facilitate the control of a color to simply enable color changeover. <P>SOLUTION: A material supply line has a main agent tank 10, a curing agent tank 20 and an additive tank 30. The main agent based on a polyol is stored in the main agent tank 10, and an isocyanate compound of the curing agent is stored in the curing agent tank 20. An internal release agent and a colorant inferior to the compatibility with the polyol among the additives of the main agent are not compounded with the main agent, in order to prevent the mixing with air bubbles due to strong stirring and stored in the additive tank 30 as third supply components. These components are supplied to the mixing chamber of a spray gun through a line L3 separate from a main agent supply line L1a and a curing agent supply line L2a to mix the main agent, the curing agent, the internal release agent and the colorant. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

TECHNICAL FIELD The present invention relates to a method for supplying a mixed reaction curable material.

2. Description of the Related Art Heretofore, a mixed reaction curable material has been known in which a main component containing a polyol as a main component and an isocyanate compound as a curing agent are used. JP-A-55-1339
No. 34, as a method of supplying the mixed reaction curable material to the mixing chamber, a first component composed of an isocyanate compound, a polyol which is an active hydrogen compound, a colorant, a diluent, an internal mold release agent, a crosslinking agent, It has been proposed to supply the second component, which is a main component composed of a dispersant, and the third component, which is composed of an active hydrogen compound and a filler, to the mixing chamber of the molding machine through the respective supply paths. The above-mentioned publication relates to a method for producing a resin molded product from a mixed reaction-curable material, which contains a filler such as glass fiber for the purpose of strengthening the resin molded product. When blended in two components, the viscosity of the component in which the filler is blended remarkably increases, and there is an inconvenience such as the necessity of using a high-pressure pressure pump. Therefore, the filler should not be blended in the first component or the second component. Instead, the material supply method is improved so that the third component is supplied independently.

However, in the above-mentioned conventional material supplying method, since the main component of the second component contains a component such as an internal release agent having a specific gravity and a viscosity greatly different from those of the polyol, the main component is not used. These components are easily separated in the main agent tank to be supplied. For this reason, it is necessary to strongly stir the stored main agent in the main agent tank, and this agitation causes air to be entrained in the main agent, causing air bubbles to be trapped in the main agent. By the way, there is skin forming as an application of the mixed reaction curing type material, and it is used to form a skin by spraying a mixture of a main agent and a curing agent into a mold from a spray gun. If so, the mixture does not come out smoothly from the nozzle due to the influence of air bubbles, and the mixture is sprayed with a fluffy feeling, resulting in uneven particle size in the coating film of the mixture applied in the mold. Therefore, conventionally, there has been a problem that the obtained skin-molded article has uneven film thickness and uneven color. In addition, the difference in elongation and strength of the skin is so great that it may cause a problem that the skin-molded article cannot be reliably peeled off. The object of the present invention is to
It is possible to supply the main agent of the mixed reaction curable material to the mixing chamber while reducing the entrapment of bubbles, and it is possible to use the mixture of the main agent and the curing agent in a state where there is no adverse effect due to the entrapment of bubbles. It is to provide a method for supplying a mixed reaction curable material.

In order to solve the above-mentioned problems, the present invention provides a mixed reaction-curable material in which a main agent and a curing agent of the mixed-reaction-curable material are supplied to a mixing chamber from respective supply paths. In the supply method, the internal mold release agent among the additives of the main agent is supplied to the mixing chamber from a supply path different from the supply paths of the main agent and the curing agent as a third supply component without being mixed with the main agent. It is characterized by doing. The internal release agent, which is an additive for the main agent, has poor miscibility with the polyol, which is the main component of the main agent, but the internal release agent is supplied to the mixing chamber from a supply route different from the supply route of the main agent and the curing agent. As described above, if the main agent is not mixed with the internal release agent, it is not necessary to strongly stir the main agent in the main agent tank, and it is possible to reduce the occurrence of entrapment of air bubbles due to the entrainment of air in the main agent. Therefore, when a mixture obtained by mixing the main agent and the curing agent is used for skin forming or the like, it can be applied in a state in which the adverse effect due to the entrapment of bubbles is eliminated. Thus, for example, in skin molding, it is possible to smoothly spray the resin mixture into the mold from the spray nozzle and apply the resin mixture to obtain a good skin having a uniform film thickness. In this case, if the internal mold release agent is diluted with the main agent, the internal mold release agent can be fluidized by the polyol as the main component, and the internal mold release agent can be pumped by a pump like a liquid. Further, since the colorant, which is an additive of the main agent, also has poor miscibility with the polyol, a colorant can be further added to the internal release agent as the third supply component. By doing so, it is possible to manage the color of the mixed reaction curable material not with the large tank that stores the main agent, but with the small tank that stores the internal release agent. Will be easier.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. FIG. 1 is an explanatory diagram showing a supply line of a mixed reaction curable material to which a supply method according to an embodiment of the present invention is applied. In this embodiment, the mixed reaction-curable material is used for skin forming. As shown in FIG. 1, the material supply line includes a main agent tank 10, a curing agent tank 20, and an additive tank 30, the main agent tank 10 includes a supply line L1a and a return line L1b, and the curing agent tank 20 includes a supply line. L2a
And the return line L2b is connected to a spray gun which is a liquid spraying device equipped in a molding machine (not shown). The additive tank 30 is connected to the spray gun by a supply line L3. These supply lines L1a to L3 are formed of pipe lines. The main agent tank 10 stores a main agent containing a polyol as a main component. The main agent tank 10 includes a stirrer 11 for stirring the main agent, a circulation pump 16 for circulating a heat medium in the tank 10 to heat the main agent, and a temperature. A heating circuit G1 provided with an adjusting heat medium heater 17 and an air dryer 9 for drying the atmosphere in the main agent tank 10 are attached. The main agent supply line L1a is attached to the main agent tank 10, and an on-off valve 18 is provided in this supply line L1a.
A strainer 12 for removing fine foreign substances in the main agent supplied from the tank 10, a metering pump 13 for measuring the amount of the main agent supplied, and a heat exchanger 14 for heating the main agent to be supplied.
And a flow meter 15 for measuring the flow rate of the main agent are inserted in this order from the upstream side. Regarding the temperature of the main agent supplied to the mixing chamber, the temperature of the main agent flowing through the supply line L1a is measured near the downstream of the flow meter 15 and near the spray gun with the liquid thermometer 19, and the heat exchanger 14 is measured based on the measured temperature. The temperature is controlled to a predetermined temperature by adjusting the heating amount of the main agent. The curing agent tank 20 stores an isocyanate compound of a curing agent, and the curing agent tank 20 includes a stirrer 21 for stirring the curing agent and a circulation pump 26 for circulating a heat medium to the tank 20 to heat the curing agent. And a heating circulation path G2 having a temperature adjusting heat medium heater 27 interposed therebetween. The curing agent supply line L2a is attached to the curing agent tank 20, and the main agent supply line L1a is connected to this supply line L2a.
Similarly to the open / close valve 28, a strainer 22 for removing fine foreign matters in the curing agent supplied from the tank 20, a metering pump 23 for measuring the supply amount of the curing agent, and a heat exchange for heating the curing agent to be supplied. A container 24 and a flow meter 25 for measuring the flow rate of the curing agent are inserted in this order from the upstream side. The temperature of the curing agent supplied to the mixing chamber is the supply line L2a near the downstream of the flow meter 25 and near the spray gun.
The temperature of the curing agent flowing through the liquid is measured by the liquid thermometer 29, and the amount of heating of the curing agent in the heat exchanger 24 is adjusted based on the measured temperature to control the temperature to a predetermined temperature. In the additive tank 30, for the main agent and the curing agent, which are the first and second supply components,
Conventionally, some of the additives compounded in the main agent
It is stored as a supply ingredient of. This third supply component is an additive that is not well miscible with the polyol, which is the main component of the main component, and in the present embodiment, an internal release agent and a colorant (color pigment) are added to the third supply component. Selected. The internal mold release agent and the colorant are stored in the tank 30 after being diluted with the main agent, preferably the main component polyol, in order to impart fluidity with the main agent polyol and enable pumping like a liquid. . The additive supply line L3 is attached to the main agent tank 30, and a metering pump 31 is inserted in the supply line L3. In the supply line L3, the cleaning liquid tank 33 is provided on the downstream side of the metering pump 31.
4 are connected. In carrying out skin forming,
In the main agent tank 10, the stored main agent is agitated by a stirrer 11, and the temperature is adjusted to a predetermined temperature by a heating medium heater 17. Since the main component has a large difference in specific gravity and viscosity from the main component polyol, and does not contain additives such as internal mold release agents and colorants, which have poor miscibility with polyols,
In order to prevent the separation of the polyol and the additive, it is not necessary to stir vigorously, and mild stirring may be performed. Under the above stirring and temperature control, the open / close valve 28 is opened, the metering pump 13 is operated, and the main agent is sent from the tank 10 to the supply line L1a. The main agent sent to the supply line L1a is filtered by the strainer 12 to remove foreign matters, and the line L1a is pressure-fed while the supply amount (flow rate) is measured by the metering pump 13.
Supplied to the spray gun. The main agent supplied to the spray gun is returned to the main agent tank 10 through the return line L1b without entering the mixing chamber of the spray gun except when spraying, and is circulated as main agent tank → spray gun → main agent tank. Similarly, in the curing agent tank 20, the stored curing agent is agitated by the agitator 21, and the temperature control heating medium heater 2
The temperature is adjusted to a predetermined temperature by 7. Under this stirring and temperature control, the opening / closing valve 28 is opened, the metering pump 23 is operated, and the hardening agent is supplied from the tank 20 to the supply line L2a.
Send to. The hardening agent sent to the supply line L2a is filtered by a strainer 22 to remove foreign matter, and then the measuring pump 2
While the supply amount (flow rate) is being measured at 3, the line L2a is pressure-fed and supplied to the spray gun. The curing agent supplied to the spray gun does not enter the mixing chamber of the spray gun except when spraying, as in the case of the main agent, and returns to the return line L2.
Returned to the curing agent tank 20 through b, and the curing agent tank →
It is circulated from the spray gun to the hardener tank. During spraying, the main agent and the curing agent supplied to the spray gun are jetted into the mixing chamber and mixed by the stirring effect accompanying the jetting. At the same time, the additive from the additive tank 30 is jetted into the mixing chamber and mixed with the main agent and the curing agent. The additive is sent to the supply line L3 by the operation of the metering pump 31 and pressure-fed to the spray gun. The mixture obtained by mixing the main agent, curing agent, and additives (internal release agent and colorant) is pressed into the spray nozzle from the mixing chamber of the spray gun at the pressure when it is being pumped, and then sprayed from the spray tip at the tip of the nozzle. It is sprayed into a mold and molded into a colored skin. After forming the skin, the cleaning liquid tank 33 to the metering pump 3
By flowing the cleaning liquid to the supply line L3 by 4, it is possible to clean the supply line L3 and the mixing chamber of the spray gun. The supply method of the present embodiment is configured as described above, and does not mix the internal mold release agent and the colorant, which are additives having poor miscibility with the polyol, which is the main component of the main agent, in the main agent, , An internal release agent and a colorant as a third supply component to the main agent and the curing agent of the second supply component are supplied to the mixing chamber of the spray gun from a supply route different from the supply route of the main agent and the curing agent. Thus, the main agent only needs to be slightly agitated in the main agent tank, and it is possible to reduce the occurrence of air bubble entrapment due to air entrainment in the main agent. Therefore, when spraying the mixture of the main agent and the curing agent (the main agent without the combination of the internal release agent and the colorant, and the curing agent, the internal release agent and the colorant) into the mold, the spray nozzle is used. Therefore, the mixture can be smoothly sprayed in a state where there is no adverse effect due to the entrapment of air bubbles, and it is possible to prevent unevenness in particle diameter from occurring in the coating film of the mixture applied in the mold. Therefore, it is possible to obtain a stable skin having a uniform film thickness and a clear hue by the mixed reaction-curing resin. Further, since the difference in elongation and strength of the skin is large, the skin-molded article is not easily peeled off, and the skin-molded article can be reliably peeled off. Furthermore, since the colorant is added to the internal mold release agent without being blended with the main compound, it is possible to manage the color of the mixed reaction-curable material without using a large tank for storing the main compound. It can be managed in a small tank for storage, which makes it easy to control the color of the material. Another embodiment of the present invention is shown in FIG. The present embodiment is provided with additive tanks 30a, 30b, 30c storing additives of three colors and a color changer 32 for switching the colors of the additives supplied to the spray gun. Is different from. In FIG. 2, the same reference numerals as those shown in FIG. 1 indicate the same members. The above additive tanks 30a, 30
In b and 30c, a colorant (for example, yellow, red, blue) defined as A color, B color, and C color here and an internal mold release agent are diluted with a main component, preferably a main component polyol. Stored. The additive tanks 30a to 30c are connected to a color changer 32 via a metering pump 31, respectively, and the color changer 32 is connected to a supply line L3. A cleaning liquid tank 33 is further connected to the color changer 32 via a metering pump 34.
At the time of spraying, the supply line L is supplied by the color changer 32.
By switching the tanks 30a to 30c connected to No. 3, the color of the additive supplied to the spray gun is selected. The additive of the selected color is sent to the supply line L3 through the color changer 32 by the operation of the metering pump 31 of the tank, is pumped to the spray gun, and is jetted to the mixing chamber. Then, as in the case of the first embodiment, the tank 10 and the tank 20 are connected to the supply line L1.
a, L2a, is supplied to the spray gun, and is mixed with the main agent and the curing agent sprayed into the mixing chamber by the stirring effect accompanying the spraying. Similarly, the mixture of the main agent, the curing agent, and the additives (internal release agent and colorant) is sprayed into the mold from the tip of the spray nozzle tip to form a colored skin. When it is desired to change the color for forming the skin after forming the skin, the cleaning liquid is supplied from the cleaning liquid tank 33 through the color changer 32 by the metering pump 34 to the supply line L3.
Then, the line L3, the mixing chamber of the spray gun and the like are washed, and then an additive having a desired color is selected and used for molding. According to the present embodiment, in addition to having the same effect as the first embodiment, a plurality of additive tanks are prepared so that additives of a plurality of colors can be switched and supplied,
There is also an advantage that the color of the mixed reaction curable material can be easily changed. In any of the above embodiments, the third route of supplying from a route different from the respective routes of the main agent and the curing agent.
Although the internal mold release agent and the colorant were selected as the main component additives as the supply component of the above, one of the internal mold release agent and the colorant may be used as the third supply component, and further the internal mold release agent may be used. And an additive other than the colorant may be used as the third feed component. Further, in the embodiment, the supply method when the mixed reaction curable material is used for skin molding has been described, but the present invention is not limited to this, and the mixed reaction curable material is used for molding such as paint and injection molding. It can also be applied to the supply method in the case of doing.

As is apparent from the above description, according to the present invention, the main agent of the mixed reaction-curable material can be supplied to the mixing chamber while reducing the trapping of bubbles, and the mixture of the main agent and the curing agent can be obtained. It can be used without being adversely affected by the entrapment of bubbles. Further, the color of the material can be easily managed, and the color can be easily changed in a short time.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a supply line of a mixed reaction curable material to which a supply method according to an embodiment of the present invention is applied.

FIG. 2 is an explanatory diagram showing a supply line for a mixed reaction curable material to which a supply method according to another embodiment of the present invention is applied.

[Explanation of symbols]

10 Main agent tank 11, 21 stirrer 13, 23 metering pump 14, 24 heat exchanger 15, 25 Flowmeter 17, 27 Heat medium heater for temperature control 18, 28 open / close valve 20 Hardener tank 30 additive tank 31 metering pump 32 color changer 33 Cleaning liquid tank L1a Main agent supply line L1b Main agent return line L2a curing agent supply line L2b Hardener return line L3 additive supply line

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4F033 QA01 QB03X QB18 QD02                       QD14                 4F201 AA36 AB03 AB12 BA01 BC33                       BK62 BK64 BN50 BQ02 BQ09                       BQ20 BQ34 BQ40 BQ45 BQ50                       BQ52                 4G035 AB41 AE13                 4G037 AA02 EA01

Claims (3)

[Claims] 1. A method for supplying a mixed reaction-curable material, wherein a main agent and a curing agent for the mixed reaction-curable material are supplied from respective supply paths to a mixing chamber, wherein an internal release agent of the additives for the main agent is used. A method for supplying a mixed reaction curable material, characterized in that, as a third supply component, is not mixed with the main agent and is supplied to the mixing chamber from a supply path different from the supply paths of the main agent and the curing agent. 2. The supply method according to claim 1, wherein the internal release agent is diluted with a main agent. 3. The supply method according to claim 1, wherein a colorant among the additives of the main component is further added to the internal mold release agent as a third supply component.