JPH02121816A - Manufacture of reinforced plastic structure - Google Patents

Abstract

PURPOSE:To improve the strength and surface stability of reinforced plastic resin by coating the recess of the product shape of a lower mold with mold release agent, depositing urethane elastomer resin of predetermined thickness thereon, disposing a matlike fiber reinforced material, closing the mold with an upper mold, pouring polymer material, curing it, and removing the molded form from the mold. CONSTITUTION:The recess 1a of a product shape of a lower mold 1 is coated with mold release agent 2, and urethane elastomer resin 4 is then deposited thereon. A matlike fiber reinforced material 5 is disposed thereon, an upper mold 6 is set, and the molds are closed. Polymer material 8 is poured as a reinforcing agent from the pouring inlet 6a of the mold 6, and infiltrated into the material 5. After reaction curing, a mold form is removed from the mold to obtain a reinforced plastic structure 10. The agent 2 is made of wax or surfactant, and long-chain polyol is, for example, employed as the resin 4. Thus, the structure 10 can be formed in an arbitrary thickness to enhance its strength and surface stability.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to reinforced plastic structures, and particularly to reinforced plastic structures in which plastic materials are combined with inorganic substances such as glass fibers, mica and carbon fibers, or organic substances such as heat-resistant aramid fibers. It's about structures.

2. Description of the Related Art In general, reinforced plastic structures are plastics whose strength is increased by molding a plastic material in combination with a reinforcing material such as glass fiber, and are characterized by high rigidity. Regarding the above, for example, Japanese Patent Publication No. Sho 62-251106 discloses a method for molding a highly rigid reinforced plastic with a surface coating, and usually RIM (Reaction Injection) is used.
The above-mentioned molding means called ion molding is shown in the order of steps in FIGS. 8 to 11. That is, as shown in FIG. 8, first, a mold release agent is applied in advance into the product-shaped recess 1a formed in the lower mold L constituting the mold, and a spray gun G is used to apply thinner. A urethane paint 12a is applied inside the recess 1a to form a film 12 with an appropriate thickness.

Next, as shown in FIG. 9, a mat-like fiber reinforcing material 5 is placed from above the film 12, and an upper mold 6 is set from above this mat-like fiber reinforcing material 5, as shown in FIG. Close the mold as shown. An injection port 6a for injecting a polymer raw material as a reinforcing agent is pre-opened approximately in the center of the upper mold 6, and an injection head 7 disposed in the injection port 6a is inserted into the mat-like fiber reinforcement. A polymer raw material 8 as a reinforcing agent is injected into the material 5, and this polymer raw material 8
is impregnated into the inside of the mat-like fiber reinforcing material 5. As the polymer raw material 8, for example, an unsaturated monoalcohol, a polyisocyanate, and a catalyst are used. The entire mold is left in this state for a predetermined period of time to react and harden, and then removed from the mold to form a coating 12 and a coating I as shown in FIG.
It is possible to obtain a reinforced plastic comprising a base material 22 in which a polymer raw material is impregnated into the mat-like fiber reinforcing material 5 and hardened.

Furthermore, in Japanese Patent Publication No. 63-27221, the above-mentioned R+M?
Other methods for making i-coalesces are disclosed. That is, as shown in FIG. 12, a product-shaped cavity is formed between the lower mold 1 and the upper mold 6, and a preformed mat fiber reinforcing material 5 is inserted into this cavity and temporarily fixed. , the corresponding ma.

The cavity is separated into an upper and lower space by a strip-shaped fiber reinforcing material 5, and a low-viscosity material, which is a mixture of polyol A and isocyanate, is filled into the upper space from an injection port 6b formed in the upper mold 6. A RIM in which a high viscosity material is filled into the lower space from another injection port 6c similarly formed in the upper mold 6, and is reacted and cured in each space. I am trying to obtain u union. The reactive materials used include conventional additives such as long-chain polyols, chain extenders, crosslinking agents, incyanates, mold release agents, and suitable blowing agents.

Problems to be Solved by the Invention However, in the conventional manufacturing method 1 of such a reinforced plastic structure, for example, in the method disclosed in Japanese Patent Publication No. 62-251106, a urethane paint 12a containing thinner is used as the coating 12. Therefore, in order to obtain a predetermined film thickness, the urethane paint 12a must be applied thickly, and the cost required for applying the paint 12a increases significantly. However, this method requires a lot of time and reduces productivity. Therefore, from the viewpoint of cost and productivity, the paint 12a
The practical film thickness is limited to 0.5 mm or less,
It is difficult to obtain a surface that is sufficiently satisfactory in terms of surface stability 9, such as smoothness, image clarity, and feel, and is therefore unsuitable for use in exterior materials for automobiles and the like. In other words, RIM molded urethane, ester, evokin,
Due to the difference in linear expansion coefficient between the resin such as disyflopentadiene and the mat-like fiber reinforcing material, surface roughening may occur, which is a problem in terms of appearance.

On the other hand, in the case of the method described in Japanese Patent Publication No. 63-27221, it is necessary to prepare a preformed mat-like fiber reinforcing material 5, and a high viscosity material is also used as the material to be injected into the cavity. Since two types of viscous materials are used, a low viscosity material and a low viscosity material, the material cost is high. Furthermore, since two injectors for the above-mentioned viscous material are required, the process becomes complicated and it is difficult to carry out continuous work, and furthermore, it is difficult to control the timing of injection of the polymer raw material and the reactivity of the raw material during the work. It has the problem of being difficult.

Therefore, the present invention solves the problems associated with the conventional manufacturing method of reinforced plastic structures, and improves the surface stability of the resulting structure and provides good dimensional and shape retention. Moreover, it is an object of the present invention to provide a method for manufacturing a reinforced plastic structure with high productivity.

Means for Solving the Problems In order to achieve the above object, the present invention includes a step of applying a mold release agent into a recess of a product shape formed in a lower mold, and a step of applying a mold release agent to a predetermined thickness from above the mold release agent. A step of applying a urethane elastomer resin, a step of arranging a mat-like fiber reinforcing material from above the urethane elastomer resin, and an upper mold in which a reinforcing agent injection port is pre-opened from the upper surface of the mat-like fiber reinforcing material. and a step of injecting a polymer raw material as a reinforcing agent into the inside of the mat-like fiber reinforcement material from the injection port to impregnate the inside of the mat-like fiber reinforcement material with the polymer raw material. The present invention provides a method for manufacturing a reinforced plastic structure comprising the steps of: (1) leaving the entire mold for a predetermined period of time to cause reaction and hardening, and then removing the mold.

Effect: According to this method of manufacturing a reinforced plastic structure, there is a step of first applying a mold release agent into the recess of the product shape formed in the lower mold, and then applying a urethane elastomer resin of a predetermined thickness. The presence of this urethane elastomer resin makes it possible to give the resulting reinforced plastic structure any desired thickness, increasing the strength and surface stability of the reinforced plastic resin, as well as improving smoothness and sharpness. You can get something that satisfies you in terms of quality and feel. In addition, since there is no need to use thinner or the like when applying the urethane elastomer resin, it is possible to eliminate the time required for scattering the thinner. , after closing the mold from the upper surface of the mat-like fiber reinforcement material using an upper mold, injecting a polymer raw material as a reinforcing agent into the mat-like fiber reinforcement material from an injection port formed in the upper mold; In addition, the impregnation step and the step of leaving the entire mold for a predetermined period of time to react and cure, and then removing the mold can be carried out continuously, and only one polymer raw material injection device is required. The effect of further improving productivity can be obtained.

EXAMPLE Hereinafter, an example of the method for manufacturing a reinforced plastic structure according to the present invention will be described in detail, with the same reference numerals attached to the same components as in the conventional structure.

FIGS. 1 to 6 are schematic diagrams showing the molding process in manufacturing the reinforced plastic structure according to the present invention. First, as shown in FIG. A mold release agent 2 is applied to the recess 1a of the product shape using a spray gun G1, and then an in-mold coat paint 3 is applied using a spray gun G2 as shown in FIG. This in-mold coat paint 3 is usually mainly composed of urethane paint, and is used after being diluted with an appropriate solvent.

The film thickness of the in-mold coating material 3 is 5 to 100 μm. In the case of the present invention, the step of applying the in-mold coating material 3 described above is not necessarily required, and this step can be omitted.

Next, as shown in FIG. 3, a urethane elastomer resin 4 is applied over the in-mold coat paint 3 using a spray gun G3. The components of this urethane elastomer resin 4 will be described later, but the hardness of the urethane elastomer resin 4 can be freely selected, and it may be either foaming or non-foaming, yellowing type or non-yellowing type. Any type is applicable.

Furthermore, as shown in FIG. 4, a mat-like fiber reinforcing material 5 is placed on top of the urethane elastomer resin 4, and an upper mold 6 is placed on the top surface of the mat-like fiber reinforcing material 5 as shown in FIG. Set and close the mold. An injection port 6a for injecting a polymer raw material as a reinforcing agent is formed in advance at approximately the center of the upper mold 6.

Next, as shown in FIG. 6, a polymer raw material 8 as a reinforcing agent is injected into the mat-like fiber reinforcing material 5 from the injection port 6a using the injection head 7, and the polymer raw material 8 is transformed into a mat-like fiber reinforcement material 5. It is impregnated into the inside of the fiber reinforcing material 5. The entire mold is left in this state for a predetermined period of time to react and harden, and then removed from the mold. As shown in FIG. A reinforced plastic structure 10 in which the 77)-shaped fiber reinforcing material 5 is laminated and fixed is obtained.

The mold release material 2 is made of wax-based, silicon-based, fluorine-based, or surfactant, and in addition to the spray gun G,
It may also be applied by brushing.

In addition, an appropriate color can be selected for the in-mold coat paint 3 depending on the appearance requirements.

Further, as the urethane elastomer resin 4, conventional urethane elastomers such as long chain polyols (polyether polyols, polyester polyols, polybutadiene polyols, and other polyols) are used, and crosslinking agents such as chain glycols, aromatic polyamines,
Aliphatic polyamines are used. Other catalysts and, if necessary, polyol materials such as blowing agents, foam stabilizers, and colorants can be mixed with polyisocyanate.

Blending examples 1 and 2 of urethane elastomer resin 4 that give suitable results are shown below.

Formulation example of urethane elastomer resin I fLiol mixture Sumifen 3900 95 (wt%) (Sumifen Bayer Urethane Co., Ltd.) Ethylene glycol 5 (l) (Mitsubishi Yuka Co., Ltd.) DA
BCO33LV 1(') (Sankyoko 1bun Duct Co., Ltd.) Isocyanate Sumire 1-le PC
38,4 (#) (Resident Bayer Urethane Co., Ltd.) MC
OINDEX 105 Urethane elastomer resin formulation example 2 f-liol mixture SBU polyol 0810 95 (
(wt%) (Sumiju Bayer Urethane Co., Ltd.) 1.4-butanediol 5 (S DABCO33LV O,5(') dibutyltin dilaurate 0.05 (Li (Nippon Nyukaiza Co., Ltd.) Isocyanate Sumidur PF 34.1 (I)
(Resident Bayer Urethane []).

On the other hand, as the mat-like fiber reinforcing material 5 disposed on the upper surface of the urethane elastomer resin 4, for example, a Continuous 5strand mat manufactured by Asahi Fiberglass Co., Ltd. is used. . Furthermore, in addition to the above materials, chopped strand mats, glass cloth, milled fiber chopped fibers, mica, glass flakes, etc. can be used.

The amount of penetration of these Japanese lath pine is 5% relative to the cavity volume.
Approximately 70% is appropriate.

Next, Examples 1 and 2 of blending polymer raw materials to be injected into and impregnated into the mat-like fiber reinforcing material 5 will be shown.

Blend example of polymer raw materials I Baydur PU Q720B, 1100pb
(Bayerlt system polyol) Desmo
du 44vlOF, 170pbw (Bay
erlt M-shaped MDl) Polymer raw material formulation example 2 ARIMAX 11005IDE:B loOpbw
(Aschland Chemical, acrylic esterol) ARIMAX 11005IDE:A
49.7 pbw (Aschland Chemical
, liquid MDI) NCOINDEX 105 In addition to the above, polymer raw materials that can be liquid and injected such as nylon, epoxy, dicyclopentadiene, etc. can be similarly employed.

According to the method for manufacturing a reinforced plastic structure of the present invention, the mold release agent 2 is first applied into the product-shaped recess 1a formed in the lower mold 1, and then the mold release agent 2 is applied from above as necessary. Since the step of applying the in-mold coat paint 3 and then applying the urethane elastomer resin 4 of a predetermined thickness is provided, the reinforced plastic structure 10 obtained by the presence of the urethane elastomer resin 4 can be used as desired. It becomes possible to provide a thickness of . Therefore, the strength and surface stability of the reinforced plastic resin 10 can be increased, and since there is no need to use thinner or the like when applying the urethane elastomer resin, the time required for the thinner to scatter can be eliminated.

Further, the step of arranging the mat-like fiber reinforcing material 5 from above the urethane elastomer resin 4, and after closing the mold from the upper surface of the mat-like fiber reinforcing material 5 using the upper mold 6, forming an opening in the upper mold 6. A step of injecting the Bommer raw material as a reinforcing agent into the mat-like fiber reinforcing material 5 through the injection port and impregnating it, and a step of leaving the entire mold for a predetermined time to react and harden, and then demolding. Since these steps can be carried out continuously, productivity can be further improved.

Effects of the Invention As explained in detail above, the method for manufacturing a reinforced plastic structure according to the present invention includes the step of applying a mold release agent into the recess of the product shape formed in the lower mold, and the step of applying the mold release agent A step of applying a urethane elastomer resin of a predetermined thickness from above, a step of arranging a cloak-like fiber reinforcing material from above the urethane elastomer resin, and a reinforcing agent injection port being installed from the top surface of the mat-like fiber reinforcing material in advance. A process of closing the mold using an upper mold having an opening formed therein, and injecting a polymer raw material as a reinforcing agent into the mat-like fiber reinforcing material from the injection port, and forming the polymer raw material into a mat-like m'rl#. The present invention provides a manufacturing method consisting of a step of impregnating the inside of the reinforcing material, and a step of leaving the entire mold for a predetermined period of time to react and harden, and then removing the mold, which provides the following effects. . In other words, since the step of first applying a mold release agent into the concave part of the product shape formed in the lower mold and then applying a urethane elastomer resin of a predetermined thickness, the reinforcement obtained by the presence of this urethane elastomer resin is A reinforced plastic structure that can be given any desired thickness to the plastic structure, increase the strength and surface stability of the reinforced plastic resin, and also satisfy the needs in terms of smoothness, sharpness, and feel. can be obtained. In other words, the difference in linear expansion coefficient between the RIM-molded resin and the matte fiber reinforcing material prevents surface roughness from occurring, and not only improves the appearance, but also allows the reinforced plastic structure to be modified as needed. It is also possible to provide additional flexibility.

Furthermore, since there is no need to use thinner etc. when applying the urethane elastomer resin, it is possible to freely obtain the desired predetermined film thickness, and there is an advantage that the time required for scattering the thinner can be eliminated. . Furthermore, a step of arranging a mat-like fiber reinforcing material from above the urethane elastomer resin, and after closing the mold from the upper surface of the mat-like fiber reinforcing material using an upper mold, an injection port formed in the upper mold is inserted into the mat. The process of injecting and impregnating a polymer raw material as a reinforcing agent into the inside of the shaped fiber reinforcing material, and the process of leaving the entire mold for a predetermined time to react and harden, and then demolding are performed continuously. In addition, there is also a polymer raw material injection device.
Since only one machine is needed, productivity is further improved and costs are significantly reduced. Therefore, the present invention can provide a method for producing a reinforced plastic structure in which the resulting structure has improved surface stability, good dimensional and shape retention, and high productivity.

[Brief explanation of the drawing]

1 to 6 are schematic diagrams showing the molding process in manufacturing the reinforced plastic structure according to the present invention, FIG. 7 is a sectional view showing an example of the obtained plastic structure, and FIGS.
Fig. 10 is a schematic diagram showing a similar molding process for a conventional reinforced plastic structure, Fig. 11 is a sectional view showing an example of a conventional plastic structure, and Fig. 12 shows a conventional molding means for a plastic pond structure. It is a sectional view of the main part. DESCRIPTION OF SYMBOLS 1... Lower mold, 1a... Recessed part, 2... Mold release agent, 4...
...Urethane elastomer resin, 5...Mat-like fiber reinforcement material, 6...Upper mold, 6a...
・Injection port, 7... Injection head, 8... Polymer raw material,
10... Reinforced plastic structure, 4 people Figure 4 Figure 5 Figure 6 Figure 1 Figure 2 Figure 3 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] (1) A step of applying a mold release agent into the recess of the product shape formed in the lower mold, a step of applying a urethane elastomer resin of a predetermined thickness from above the mold release agent, and a step above the urethane elastomer resin. a step of arranging a mat-like fiber reinforcing material from the top surface of the mat-like fiber reinforcing material, a step of closing the mold using an upper mold in which an injection port for the reinforcing agent is formed in advance from the upper surface of the mat-like fiber reinforcing material; A process of injecting a polymer raw material as a reinforcing agent into the inside of the fiber reinforcing material and impregnating this polymer raw material into the inside of the mat-like fiber reinforcing material, and then leaving the entire mold for a predetermined period of time to react and harden. A method for producing a reinforced plastic structure, comprising the steps of: , and demolding.