KR102162009B1 - Eco-friendly drawing product molding system - Google Patents

Abstract

The present invention relates to an eco-friendly drawing product molding system. More specifically, the length of a shear impregnation die is extended compared to the existing technology, and is formed to be 0.6 to 1.2 times longer than that of a rear hardened die, so that a glass fiber is easily impregnated with a two-component polyurethane resin even at high speed drawing, and a mandrel for a core is provided so that the glass fiber impregnated in the rear hardened die is drawn to one side and hardened and molded into an actual product. In addition, a rod heater is built inside the mandrel for the core, and by heating the mandrel for the core, it is possible to smoothly impregnate and harden the fast-hardening two-component polyurethane resin into the glass fiber, thereby improving productivity and quality of a product, and since a glass fiber roving rack is partially installed with a bobbin (branch) type reinforcing material, when the wound glass fibers are unwound and transferred, the glass fibers are not twisted, so that glass fibers are smoothly located on thin and angular parts of the finished product, thereby improving the pultrusion speed and product quality.

Description

Eco-friendly drawing product molding system

The present invention relates to an eco-friendly drawing product molding system, and more particularly, by extending the length of the shear impregnation dies compared to the existing technology, it is formed to be 0.6 to 1.2 times longer than the hardened die at the rear end, so that it is a two-component type of glass fiber even at high speed drawing. A mandrel for a core is easily impregnated with a polyurethane resin, and a mandrel for a core is provided so that the glass fiber impregnated in the rear curing die is drawn to one side and cured and molded in the form of an actual product. It relates to an eco-friendly pultruded product molding system that improves productivity and product quality by smoothly impregnating and curing a fast-setting two-component polyurethane resin in glass fiber by heating the mandrel for the core with a built-in heater.

Pultrusion is a method used to make continuous fiber reinforced linear composites in which fibers are bonded to a matrix polymer. Typically, it is done by a one-component open reactor method using a thermosetting resin system having a gelation time in the range of several hours to several days at room temperature. In this method, continuous fibers are immersed in an open liquid resin impregnation bath and then tensioned and cured through a heated die. The cured composite material is then withdrawn from the die by a mechanical withdrawal device and cut to the desired length with a flying saw.

In addition to such an open impregnation bath method, a closed one component liquid resin injection die method is also used in the pultrusion industry. In these methods, the liquid resin is injected directly onto the reinforcing fiber through a closing die and then tensioned and cured through a heated die. At present, it is believed that over 90% of the pultrusion industry generally uses the open liquid resin impregnation bath method, which is the most economical method of manufacturing pultruded fiber-reinforced composites. In most of the thermosetting resin systems commonly used in the pultrusion industry, a monomer monomer such as styrene or methyl methacrylate (MMA) is used as a solution to the unsaturated resin. The monomer reduces the viscosity of the resin and promotes impregnation of the fibers in the open impregnation bath. However, due to stringent environmental issues (eg, styrene and MMA releases and other health hazards), closed injection pultrusion methods are noted and considered as an alternative to open impregnation bath methods. However, in order to use the closed injection die method, a modification of the resin injection device and the dispensing mechanism must be made for a conventional pultrusion set-up. Even these closed injection die modifications may not be very successful in addressing the monomer release and odor problems for conventional styrene or MMA based thermoset systems.

Resins that have been used in the pultrusion open impregnation tank and injection die method include thermosetting resins such as unsaturated polyester, vinyl ester, epoxy, phenolic resin, methacrylate, and the like.

The concept of using a polyurethane resin system (thermosetting) in pultrusion has been tried over the years. However, due to the nature of the thermosetting resin chemical reaction (eg, fast reaction kinetics, short gelation time, release of exothermic energy during the reaction, processing difficulties such as line, impregnation tank and die structure, etc.); An open impregnation bath pultrusion method using an unblocked (containing free isocyanate) liquid polyurethane thermoset resin system has not been industrially successful. Two-part polyurethane systems have been used to a very limited extent. Such two-part urethane type systems generally required the use of two-component closed injection dies on the premise of precise and continuous control of the two component ratio and proper mixing thereof during the injection process. Such a complex two-component closed die injection and drawing method has made significant progress through various efforts.

However, the existing unsaturated polyester resin (UP) contains an excessive amount (around 50%) of styrene monomer, which generates harmful VOCs, and there is a risk of fire due to the SM contained in the UP resin. Also, UP resin and VE resin are cured. Since a very dangerous peroxide curing agent is used, this peroxide is not only harmful to workers, but also remains a risk of fire or explosion due to special restrictions on transportation and storage.

In addition, in the case of one existing resin, EP resin, it is not eco-friendly because bisphenol, a carcinogen, is used.

In addition, these existing resins are impregnated with fibers through an impregnation tank (tank) for a long pot life (1 to 5 hours), and then put into the heated dies, and the excess resin is squeezed out at the die inlet, and the remaining resin flows separately. It is moved back to the impregnation tank through the pipe and reused. When using the impregnating tank, a hardening reaction occurs in the impregnation tank due to a long pot life, and thus impregnation is not well performed, resulting in poor product quality.

Korean Patent Application Publication No. 10-2003-0029825

The present invention was devised to solve the above conventional problems,

The length of the shear impregnation die is extended compared to the existing technology, and is formed to be 0.6 to 1.2 times longer than that of the rear curing die, so that the two-component polyurethane resin is easily impregnated into the glass fiber even at high speed drawing. A mandrel for core is provided so that the impregnated glass fiber is drawn to one side and hardened and molded in the form of an actual product. A rod heater is built inside the mandrel for the core, and the mandrel for the core is also heated to The objective is to provide an eco-friendly pultruded product molding system that improves productivity and product quality by smoothly impregnating and curing a curable two-component polyurethane resin.

In addition, a bobbin (branch) type reinforcement is partially installed in the glass fiber roving rack so that the glass fiber is wound, so that the glass fiber is not twisted when the wound glass fiber is unwound and transported, so that the glass fiber is smooth in the thin and angled part of the finished product. The purpose is to provide an eco-friendly pultruded product molding system that is positioned so that the pultrusion speed and product quality are improved.

In order to achieve the above object, the present invention is a molding system for an eco-friendly drawn product using a fast-curing two-component polyurethane resin,

A plurality of glass fiber roving racks in which glass fibers are wound in a yarn shape;

The inlet side of the transfer port is formed to be 200 to 400% larger than the outlet side of the transfer port so that the glass fibers wound on the glass fiber roving rack are input to the inner transfer port and transfer in the longitudinal direction to stack the glass fibers into one. A shear impregnation die for impregnating the two-component polyurethane resin injected from the outside into the glass fiber introduced into the sphere;

A rear-end hardening die connected to the outlet side of the shear impregnating die and capable of controlling the temperature in 2-3 zones so that the glass fibers impregnated in the shear impregnating die are drawn to one side and cured and molded into an actual product;

Consisting, including; a drawing device for pulling the cured product from the rear curing die,

The shear impregnation die is an eco-friendly pultruded product molding system, characterized in that it is formed to be 0.6 to 1.2 times longer than the rear hardened die compared to the existing length so that the two-component polyurethane resin can be easily impregnated into the glass fiber even at high speed drawing. It is about.

In addition, the shear impregnation die of the present invention relates to an eco-friendly pultruded product molding system, characterized in that a projection hole is formed so that the impregnation of the glass fiber and the two-component polyurethane resin injected into the transfer port is projected.

In addition, the present invention relates to an eco-friendly drawing product molding system, characterized in that a cooling device is installed between the rear curing die and the drawing device to lower the temperature of the molded article cured from the rear curing dice.

In addition, in the glass fiber roving rack of the present invention, a bobbin-type reinforcing material is partially installed so that the glass fiber that is unwound and transferred is not twisted, and the bobbin-type reinforcement is formed in a form in which glass fibers are wound. About.

In addition, the plurality of glass fiber roving racks of the present invention are used in an eco-friendly pultruded product molding system, characterized in that the glass fiber is directly introduced into the shear impregnation die through a guide while it is provided in a constant temperature and humidity room so that moisture is not absorbed by all reinforcing materials. About.

In addition, a mandrel for a core is provided so that the impregnated glass fiber is drawn to one side and hardened and molded in the form of an actual product in the rear hardening die of the present invention, and a rod heater is built inside the mandrel for the core. It relates to an eco-friendly drawing product molding system, characterized in that by heating the dragon mandrel also prevents a decrease in drawing speed.

As discussed above, the eco-friendly pultruded product molding system of the present invention extends the length of the shear impregnation dice compared to the existing technology, and is formed to be 0.6 to 1.2 times longer than the hardened dice at the rear end. A mandrel for a core is easily impregnated with a polyurethane resin, and a mandrel for a core is provided so that the glass fiber impregnated in the rear curing die is drawn to one side and cured and molded in the form of an actual product. By heating the mandrel for the core with a built-in heater, it is possible to smoothly impregnate and cure the fast-curing two-component polyurethane resin in the glass fiber, thereby improving productivity and product quality.

In addition, a bobbin (branch) type reinforcement is partially installed in the glass fiber roving rack so that the glass fiber is wound, so that the glass fiber is not twisted when the wound glass fiber is unwound and transported, so that the glass fiber is smooth in the thin and angled part of the finished product. It is positioned so that the pultrusion speed and product quality are improved.

1 is a schematic diagram showing an eco-friendly drawing product molding system according to an embodiment of the present invention,
2 is a cross-sectional view showing a shear impregnation die according to an embodiment of the present invention,
3 is a cross-sectional view showing a rear hardening die according to an embodiment of the present invention.

The present invention having such features will be more clearly described through preferred embodiments accordingly.

Before describing various embodiments of the present invention in detail with reference to the accompanying drawings, it will be appreciated that the application is not limited to the details of configurations and arrangements of elements described in the following detailed description or illustrated in the drawings. will be. The present invention may be implemented and practiced in different embodiments and may be performed in various ways. Also, the device or element orientation (eg "front", "back", "up", "down", "top", "bottom" The expressions and predicates used herein with respect to terms such as ", "left", "right", "lateral"), etc. are used only to simplify the description of the present invention, and related devices Or you may find that the element simply indicates or does not mean that it should have a specific orientation. Further, terms such as “first” and “second” are used in this application and the appended claims for purposes of explanation and are not intended to represent or imply any relative importance or spirit.

Accordingly, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiment of the present invention, and do not represent all the technical spirit of the present invention, and thus various alternatives that can be substituted for them at the time of application It should be understood that there may be equivalents and variations.

1 is a schematic diagram showing an eco-friendly pultruded product molding system according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing a shear impregnation die according to an embodiment of the present invention, Figure 3 is an embodiment of the present invention It is a cross-sectional view showing the subsequent hardening die.

As shown in Figs. 1 to 3, the eco-friendly pultruded product molding system of the present invention is a molding system for eco-friendly pultruded products using a fast-curing two-component polyurethane resin, a glass fiber roving rack 10, and a shear impregnation die. (20), a hardening die 30 at the rear stage, a drawing device 40, and a cooling device 50.

The glass fiber roving rack 10 is a shape in which glass fibers are wound in a thread shape, as shown in FIG. 1, and the glass fiber roving rack 10 is a bobbin (branch) type so that the glass fibers that are unwound and transferred are not twisted. A reinforcing member 11 is partially installed, and a glass fiber is wound around the bobbin-type reinforcing member 11. At this time, since there is usually no bobbin (branch pipe), the glass fibers are essentially twisted out as they are unwound. In this case, there is a possibility that the glass fibers may move left and right in the thin and angular part of the actual product during high-speed drawing. The bobbin (branch) type reinforcement 11 is partially provided.

Here, the part of the bobbin-type reinforcement 11 is provided in the reinforcement holder 12 because there are a plurality, and the bobbin-type reinforcement 11 is protruded vertically or horizontally so that the bobbin-type reinforcement 11 is fitted in the reinforcement holder 12 The glass fibers are released while the reinforcement 11 is vertically or horizontally inserted.

In addition, since the reinforcing material holder 12 is also installed with a bobbin type reinforcement, a plurality of fiberglass roving racks 10 are formed, and the plurality of fiberglass roving racks 10 do not absorb moisture in all types of reinforcing materials. It is provided in the constant temperature and humidity chamber (60) to prevent.

In addition, the plurality of glass fiber roving racks 10 provided in the constant temperature and humidity chamber 60 are discharged through a through hole on one side of the plurality of glass fibers through a guide stand 24 attached to the shear impregnation die 20. At this time, the urethane resin reacts with moisture to generate urea and carbon dioxide, so when the relative humidity is high, all types of reinforcing materials absorb moisture and generate air bubbles in the product, so that the reinforcing material holder 12 has constant temperature and humidity. A separate constant temperature and humidity room is needed to make it possible.

The shear impregnation die 20 is a die having a transfer port 21 formed therein, as shown in FIGS. 1 to 2, and is integrally attached to the rear hardening die 30 in the longitudinal direction. The impregnation die 20 is formed to be 0.6 to 1.2 times longer than the rear hardening die 30 to facilitate impregnation of the two-component polyurethane resin into the glass fiber during high-speed drawing by the drawing device 40.

Here, the shear impregnation die 20 is a conveying port 21 so that the glass fibers wound around the glass fiber roving rack 10 are fed into the conveying port 21 and conveyed in the longitudinal direction to stack the glass fibers into one. The inlet side of the transfer port 21 is formed to be 200 to 400% larger than the outlet side, that is, the transfer port 21 is formed in a form that narrows the width from the inlet side to the outlet side.

In addition, the shear impregnation die 20 impregnates the two-component polyurethane resin injected from the outside into the glass fiber introduced into the transfer port 21, and one side of the upper surface of the shear impregnation die 20 is a two-component polyurethane The injection hole 22 is formed so that the resin is injected, and the injection hole 22 is formed to communicate with the transfer port 21 so that the two-component polyurethane resin is transferred to the transfer port 21.

In addition, the shear impregnation die 20 is formed with a projection hole 23 so that the impregnation of the glass fiber and two-component polyurethane resin injected into the transfer hole 21 is projected, and the operator through the projection hole 23 As it can be confirmed, impregnation can be easily performed. At this time, the projection hole 23 is formed at the upper end of the shear impregnation die 20 or the entrance side of the transfer port 21 that is the front end of the shear impregnation die 20, formed at the upper end of the shear impregnation die 20 The projection hole 23 checks the impregnation of the glass fiber, and the projection hole 23 formed on the entrance side of the transfer port 21, which is the front end of the shear impregnation die 20, has a resin back (transfer port 21). Inlet side) Check the dropout phenomenon and at the same time check the injection amount and make it control.

On the other hand, the two-component polyurethane resin is connected to a supply device and supplied to the shear impregnation die 20, wherein the supply device includes: a main material storage tank in which a main material is stored among the two-component polyurethane resin; A storage tank with a curing agent in which a curing agent is stored in the two-component polyurethane resin; A metering pump connected to the main material storage tank and the hardener unit storage tank to transfer the main material or the hardener according to a set amount; It consists of a mixing unit that mixes the main material and the hardener transferred from the plurality of metering pumps and supplies them to the injection hole 22 of the shear impregnation die 20.

Here, the main material is a polyol, an amine catalyst, and an additive type releasing agent are mixed, and the polyol 94 to 98.9 + an amine catalyst 0.1 to 1 + an additive type release agent 2 to 5 are mixed in parts by weight.

1) Polyoxyethylene Glycol (Molecular Weight 200+/1 5%~600+/-5%)): 30 ~ 45%

2) Polypropylene Glycol (Molecular Weight 400+/- 5%): 25 ~ 35%

3) Polyester Polyol(Hydroxy Value 300+/- 5%): 15 ~ 25%

4) Di or Triethylene Glycol(Short Chain Extender): 5 ~ 10%

5) Aromatic amine Cayalyst (Di Cyclo Hexyl Amine): 0.10 ~ 1.0%

6) Organo-Phosphate/Organic-Ester type internal releasing agent 4 ~ 10% releasing agent with main material

In addition, the curing agent is made of polymeric isocyanate having an NCO content of 32%.

As shown in Figs. 1 to 3, the rear hardening die 30 is integrally connected to the outlet side of the shear impregnation die 20 so that the glass fibers impregnated in the shear impregnation die 20 are drawn to one side, A mandrel 31 for a core is provided so that the glass fiber impregnated into a die is cured and molded in the form of a die to be cured and molded in the form of an actual product while being drawn to one side. At this time, the core mandrel 31 is formed in various shapes according to the shape of the actual product, as shown in FIG. 3.

Here, a rod heater 33 is embedded inside the core mandrel 31 to heat the core mandrel 31 to prevent a reduction in the drawing speed, that is, the core mandrel 31 must be heated. It is heated to the inside of the drawn product, so that the product is not uncured during drawing, so the drawing is smooth.

In addition, a temperature control heating device 32 is installed outside the rear hardening die 30 to apply heat to the impregnated glass fibers drawn on the surface of the rear hardening die 30, and the temperature control heating device 32 Divided into 2~3 (2~3 zones), each heats with different temperature control. At this time, the first heating device for temperature control heats the front end of the hardening die at 80 ~ 100℃, the second temperature control heating device heats the middle part of the hardening die at 170 ~ 200℃, and the third temperature control heating device is 150 ~ Heat the rear end of the hardening die at 180°C.

On the other hand, the heat heated by the heating device 32 for temperature control of the rear hardened die 30 is transferred to the front end impregnated die 20 to the part where the front end impregnated die 20 and the rear hardened die 30 contact. A cooling water circulation device 80 is further formed so that it is not hardened in the impregnation die 20, and the cooling water circulation device 80 is formed in a jacket shape to circulate the cooling water transmitted from the outside or the cooling device 50 to circulate the inside. Blocks the heat transferred to the impregnating die 20.

As shown in FIG. 1, the drawing device 40 is a device that pulls the cured product at the rear curing die 30, and pulls the cured product by various equipment such as a motor, and the drawing device 40 Is initially connected to the glass fiber, pulls the glass fiber, and releases it from the glass fiber roving rack (10).

Here, the product pulled by the drawing device 40 and discharged to the outside is processed by a cutting device 70 that cuts the product to a required length.

As shown in FIG. 1, the cooling device 50 is installed between the rear hardening die 30 and the drawing device 40 to lower the temperature of the molded product hardened from the rear hardening die 30, water cooling type, air cooling type It lowers the high temperature of the molded product in various ways.

Here, the water-cooled cooling device lowers the temperature of the molded article by spraying water directly onto the molded article or by submerging the molded article in a storage tank in which water is stored.

In addition, the air-cooled cooling device lowers the temperature of the molded article by blowing air directly onto the molded article.

On the other hand, the cooling device 50 may be used by installing a water-cooled cooling device and an air-cooled cooling device separately or in parallel.

10: glass fiber roving rack 11: bobbin type reinforcement
12: reinforcement holder
20: shear impregnation die 21: transfer port
22: injection hole 23: projection hole
24: guide stand
30: rear hardening die 31: mandrel for core
32: heating device for temperature control 33: rod heater
40: drawing device 50: cooling device
60: constant temperature and humidity room 70: cutting device
80: cooling water circulation device

Claims (6)

In the molding system of eco-friendly drawn products using fast-curing two-component polyurethane resin,
A plurality of glass fiber roving racks 10 in which glass fibers are wound in a yarn shape;
The inlet side of the transfer port 21 is more than the outlet side of the transfer port so that the glass fibers wound around the glass fiber roving rack 10 are fed into the transfer port 21 and transferred in the longitudinal direction to stack the glass fibers into one. A shear impregnation die 20 which is formed to be 200 to 400% larger and impregnates the two-component polyurethane resin injected from the outside into the glass fiber introduced into the transfer port 21;
A rear-end hardening die 30 that is connected to the outlet side of the shear impregnation die 20 so that the glass fiber impregnated in the shear impregnation die 20 is drawn to one side and is cured and molded in the form of an actual product. and;
Consists of including; a pulling device 40 for pulling the product cured in the rear hardening die 30,
The shear impregnation die 20 is formed to be longer than the existing length so that the two-component polyurethane resin can be easily impregnated into the glass fiber even at high speed drawing, and is 0.6 to 1.2 times longer than the rear curing die 30,
The glass fiber roving rack 10 is partially installed with a bobbin-type reinforcing material 11 to prevent twisting of the unrolled and transported glass fiber, and is formed in a form in which glass fibers are wound around the bobbin-type reinforcing material 11, and the plurality of glass The fiber roving rack 10 is provided in the constant temperature and humidity chamber 60 so that moisture is not absorbed by all types of reinforcing materials, and glass fibers are directly input through the guide stand 24 attached to the shear impregnation die 20,
Outside of the rear hardening die 30, a temperature control heating device 32 is installed to apply heat to the impregnated glass fibers drawn on the surface of the rear hardening die 30, and the temperature control heating device 32 has 3 zones. It is divided into and heated by controlling the temperature differently,
A mandrel 31 for a core is provided so that the impregnated glass fiber is drawn to one side and hardened and molded into a shape of an actual product inside the rear hardening die 30, and a rod inside the core mandrel 31 is An eco-friendly drawing product molding system, characterized in that a heater 33 is built-in to prevent a drop in drawing speed by heating the mandrel 31 for the core.
The method of claim 1,
The shear impregnation die 20 is an eco-friendly pultruded product molding system, characterized in that the projection hole 23 is formed so that the impregnation of the glass fiber and the two-component polyurethane resin injected into the transfer hole 21 is projected.
The method of claim 1,
An eco-friendly drawing product molding system, characterized in that a cooling device 50 is installed between the rear hardening die 30 and the drawing device 40 so as to lower the temperature of the molded product hardened from the rear hardening die 30.
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