KR101742481B1 - Method for manufacturing composite for filament winding pipe and method for manufacturing filament winding pipe using the same - Google Patents

Abstract

The present invention relates to a method for producing a composite material for a filament winding pipe and a method for manufacturing a pipe for filament winding. More particularly, the present invention relates to a method of manufacturing a filament winding pipe by mixing a resin and a peroxide as a polymerization initiator, And the polymerization is initiated from that moment. When the temperature exceeds the above temperature, the temperature of the mixed resin is kept constant at about 40 ° C regardless of the season, and at the same time, The impregnation with the reinforcing fiber is promoted by lowering the viscosity, so that the workability and the defect caused by the poor impregnation can be minimized, and cracks and peeling due to the heat shrinkage phenomenon due to the high heat generated in the conventional molding process In order to prevent defects of the product, After cooling, the back, and inconvenient process and a secondary curing step for forming air sanding the surface and back pad are excluded accelerating the process, characterized in that the increase in the productivity and the product of the product.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method of manufacturing a filament winding pipe and a method of manufacturing a filament winding pipe using the filament winding pipe,

The present invention relates to a method for producing a composite material for a filament winding pipe and a method for manufacturing a pipe for filament winding. More particularly, the present invention relates to a method of manufacturing a filament winding pipe by mixing a resin and a peroxide as a polymerization initiator, And the polymerization is initiated from that moment. When the temperature exceeds the above temperature, the temperature of the mixed resin is kept constant at about 40 ° C regardless of the season, and at the same time, The present invention relates to a method for manufacturing a composite material for a filament winding pipe and a method for manufacturing a filament winding pipe by which impregnation with a reinforcing fiber is promoted by decreasing viscosity to minimize workability and defects due to poor impregnation.

Generally, a composite material refers to a composite formed by impregnating a thermosetting or thermoplastic resin with a reinforcing material such as glass fiber or carbon fiber to form a hardening agent and a thermosetting resin. Examples thereof include unsaturated polyester resins and vinyl esters The resin is a general method in which a polymerization reaction is initiated by using a peroxide as a polymerization initiator.

In particular, in the case of Methyl Ethyl Ketone Peroxide (MEKPO), which is often used as a polymerization initiator for room temperature, a polymerization inhibitor is generally added to the resin supplier to prevent pre-polymerization before molding.

However, this polymerization inhibitor does not inhibit 100% polymerization when mixed with a polymerization initiator, and it is generally known that it has an inhibitory effect of about 50%.

However, when the resin and the peroxide are mixed, the pre-polymerization is already started before the molding, so the viscosity of the mixture is increased and it is difficult to obtain the optimum polymer structure to be obtained after pre-polymerization due to the pre-polymerization reaction.

In addition, since the molded product thus obtained is also useful for the physical properties required after post-curing (secondary curing), the process is lengthened and equipment investment such as requiring a secondary curing chamber is followed.

Especially during the winter season, the viscosity of the mixed resin supplied with the peroxide increases sharply, so that impregnation with the reinforcing fibers becomes very difficult, resulting in poor molding and poor physical properties.

In order to prevent defects such as cracks or peeling due to thermal shrinkage due to the high heat generated during molding of a thick molded product by a usual method, the molded product should be molded to a predetermined thickness, and then the surface thereof must be sanded and re- There are many inconveniences.

Korean Patent Publication No. 10-2003-0091120

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems,

By adding a reaction modifier to the resin and the peroxide as a polymerization initiator, the reaction regulator is distributed evenly between the resin and the peroxide at temperatures below 60 ° C to prevent polymerization from origin, and when the temperature exceeds the above temperature, , The temperature of the mixed resin is kept constant at about 40 ° C., and the viscosity of the resin is lowered while preventing polymerization, thereby promoting the impregnation with the reinforcing fibers, thereby minimizing defects due to workability and impregnation failure. And a method of manufacturing a pipe for filament winding according to the method.

Further, in order to prevent defects such as cracks and peeling due to heat shrinkage due to high heat generated during molding of a thick molded product by a conventional method, the product is molded to a predetermined thickness, cooled, and then the surface is sandblasted and re- The present invention provides a method for manufacturing a composite material for a filament winding pipe in which an uncomfortable process and a secondary curing process are excluded to increase the productivity and productivity of a product, and a method for manufacturing a filament winding pipe.

In order to accomplish the above object, the present invention provides a method for manufacturing a composite material for a filament winding pipe in which a polymerization reaction occurs at a set temperature or higher, and a method for manufacturing a filament winding pipe,

Wherein 0.5 to 1.5 parts by weight of a peroxide as a polymerization initiator and 0.1 to 10 parts by weight of a reaction modifier are mixed and cured in 100 parts by weight of the resin, and a method for manufacturing a filament winding pipe .

As described above, in the method for manufacturing a composite material for a filament winding pipe of the present invention and the method for manufacturing a pipe for filament winding according to the present invention, a reaction regulator is added to peroxide as a resin and a polymerization initiator, And the polymerization is initiated from that moment. When the temperature exceeds the above temperature, the temperature of the mixed resin is kept constant at about 40 ° C regardless of the season, and at the same time, The viscosity is lowered to promote the impregnation with the reinforcing fibers, and the workability and defects due to poor impregnation can be minimized.

Further, in order to prevent defects such as cracks and peeling due to heat shrinkage due to high heat generated during molding of a thick molded product by a conventional method, the product is molded to a predetermined thickness, cooled, and then the surface is sandblasted and re- An uncomfortable process and a secondary curing process are excluded so that the process is speeded up, and productivity and productability of the product are increased.

1 is a schematic view showing a mechanism of a reaction control agent according to an embodiment of the present invention,
2 is a flowchart illustrating a method of manufacturing a filament winding pipe according to an embodiment of the present invention.

The present invention having such characteristics can be more clearly described by the preferred embodiments thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing in detail several embodiments of the present invention with reference to the accompanying drawings, it is to be understood that the invention is not limited to the details of construction and the arrangement of the components described in the following detailed description or illustrated in the drawings will be. The invention may be embodied and carried out in other embodiments and carried out in various ways. It should also be noted that the device or element orientation (e.g., "front," "back," "up," "down," "top," "bottom, Expressions and predicates used herein for terms such as "left," " right, "" lateral, " and the like are used merely to simplify the description of the present invention, Or that the element has to have a particular orientation. Also, terms such as " first "and" second "are used herein for the purpose of the description and the appended claims, and are not intended to indicate or imply their relative importance or purpose.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

1 is a schematic view showing the mechanism of a reaction control agent according to an embodiment of the present invention.

As shown in FIG. 1, the method for manufacturing a composite material for a filament winding pipe according to the present invention and the method for manufacturing a filament winding pipe according to the present invention include the steps of impregnating a thermosetting or thermoplastic resin with a reinforcing material such as glass fiber or carbon fiber, The unsaturated polyester resin or vinyl ester resin, which is a representative resin of thermosetting resin streams, is subjected to a polymerization reaction using a peroxide as a polymerization initiator to produce a composite material.

Here, as a principle in which polymerization of the reaction control agent is uniformly distributed between the resin and the polymerization initiator and the polymerization is originally blocked at 60 ° C or lower, and when the temperature is 60 ° C or higher, polymerization starts from that moment. As shown in FIG. 1, initiation of initiator curing (BB) action mechanism of the resin (unsaturated polyester or vinyl ester) is positioned at the end of the resin so that polymerization does not occur at 40 ° C or lower, and polymerization is started when the reaction regulator is removed at about 60 ° C.

Here, the composite material is cured by mixing 0.5 to 1.5 parts by weight of peroxide and 0.1 to 10 parts by weight of a reaction modifier with 100 parts by weight of the resin.

Any one of a vinyl ester resin, an epoxy resin, and an unsaturated polyester resin is selectively used as the resin.

In addition, the reaction modifier is composed of 2-butenedioic acid (2Z) -dibutyl ester. At this time, 100 parts by weight of the 2-butenedioic acid (2Z) -dibutyl ester was added to 100 parts by weight of nitric oxide, 1- (diethoxyphosphinyl) -2,2-dimethylpropyl And 3 to 8 parts by weight of 1,1-dimethylethyl (Nitroxide, 1- (diethoxyphosphinyl) -2,2-dimethylpropyl 1,1-dimethylethyl).

In the following, the formula (1) of the reaction modifier is described.

The above formula (1) is a formula of 2-butenedioic acid (2Z) -dibutyl ester.

The above-mentioned formula (2) can be prepared by reacting nitrile, 1- (diethoxyphosphinyl) -2,2-dimethylpropyl 1,1-dimethylethyl, dimethylethyl).

On the other hand, the composite material curing of the present invention is applied to the filament winding process, but it is effective for almost all processes such as transfer molding, vacuum molding, and drawing. At this time, in the filament winding process, when a stiffener impregnated with resin is touched on a mold or a mandrel, a heat source (heater, infrared lamp, etc.) of about 70 캜 is applied to initiate polymerization from the moment Accordingly, the polymer is crosslinked without pre-polymerization, thereby maximizing polymer crosslinking by polymerization and molding a composite having excellent physical properties.

In addition, since the secondary curing by the existing system is also eliminated, the process is speeded up and the space utilization is maximized.

In particular, in winter season, the effect is much better than the conventional method. In addition, in order to prevent defects such as cracks and peeling due to heat shrinkage due to the high heat generated when molding a thick product by a usual method, The inconvenience of sanding and re-pouring the posterior surface is solved.

By this selective reaction temperature control type, it is possible to obtain epoxy physical properties without using expensive epoxy resin by making strong epoxy property even with unsaturated polyester resin when forming.

[Table 1] and [Table 2] for comparison of vinyl ester resin and epoxy resin to which the production method of the present invention is applied will be described below.

Item Epoxy resin Vinyl ester resin Mixing ratio 100: 25-30 100: 0.5 to 1.5 Viscosity Approximately 1,000 cps 300 to 400 cps Low viscosity importance Approximately 1.11 Approximately 1.05 About 5% less Gel time About 70 minutes About 35 minutes 50% short Maximum heat temperature 210 150 ~ 200 5 to 25% less Tensile strength psi 10,700 12,000 + 12% higher Breaking Tensile Ratio 4.1% 7.5% + 83% higher Tensile elastic psi 493,000 540,000 + 10% Flexural strength psi 18,000 22,000 + 22% higher Flexural elasticity psi 493,000 500,000 + 1% high Heat distortion temperature 79 108 + 37%

Suzy Curing temperature Presence or absence of reaction modifier Elastic modulus, GPa Thermal deformation temperature Tg, Vinyl ester 1 Room temperature radish 5 121 Vinyl ester 2 Room temperature radish 7 120 Vinyl ester 1 Room temperature Addition of inhibitor 9 115 Vinyl ester 2 heating Addition of reaction modifier 8.5 127 Vinyl ester 1 heating Addition of reaction modifier 16 121

* Heat curing condition: Resin temperature 40 ℃ / Mold temperature 70 ℃

As shown in the above Table 2, it can be seen that the elastic modulus of the vinyl ester 1 is more than twice the epoxy physical property as that of the general curing.

Hereinafter, a method for manufacturing a filament winding pipe using a composite material manufactured by the composite material manufacturing method for a filament winding pipe will be described with reference to the drawings.

2 is a flowchart illustrating a method of manufacturing a filament winding pipe according to an embodiment of the present invention.

As shown in FIG. 2, in the filament winding pipe manufacturing method of the present invention, a filament winding process is performed on a plate made of the composite material by a mandrel device (S100 ).

The spiral plate members are overlapped with each other. When the heat source of 70 ° C or more is heated, the spiral plate members are cured instantaneously (S200). At this time, the instant curing method is described in the composite material manufacturing method described above.

Here, a portion where the plate materials of the composite material are overlapped with each other according to the filament winding is heated by using a heater, an infrared lamp, or a hot air heater.

At this time, the heater, the infrared lamp, the hot air blower, and the like can be fixedly installed on the carriage and moved, so that the plate material of the composite material can move according to the area where the plates are overlapped with each other.

In this way, the mandrel device is removed from the completed pipe and completed (S300).

Claims (6)

Characterized in that 0.5 to 1.5 parts by weight of peroxide as a polymerization initiator and 0.1 to 10 parts by weight of a first reaction modifier are mixed and cured in 100 parts by weight of the resin,
By the first reaction control agent, polymerization is prevented at 40 ° C or lower, and polymerization is carried out at 60 ° C or higher,
The resin is a vinyl ester resin,
The first reaction modifier is 2-butenedioic acid (2Z) -dibutyl ester,
3 to 8 parts by weight of a nitroxide, 1- (diethoxyphosphinyl) -2,2-dimethylpropyl 1,1-dimethylethyl (1-n-butyllithium) as a second reaction controlling agent to 100 parts by weight of the first reaction- (diethoxyphosphinyl) -2,2-dimethylpropyl 1,1-dimethylethyl) is further mixed. delete delete delete delete delete

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