KR100655032B1 - Waterproof sheet using ethylene-vinylacetate copolymer and its manufacturing method - Google Patents

Abstract

The present invention is a non-exposed waterproof waterproof sheet used on a rooftop or basement outer wall of a building structure, underground parking lot, etc., impregnating glass fibers between a resin layer of ethylene vinyl acetate copolymer containing a high content of vinyl acetate and disposing the nonwoven fabric above and below the resin layer. It relates to a waterproof sheet produced by bonding and a method of manufacturing the same. Waterproof sheet of the present invention comprises two EVA resin layers composed of 50-60% by weight of ethylene and 50-40% by weight of vinyl acetate; A glass fiber layer provided between the EVA resin layers; And a nonwoven fabric layer impregnated with the upper and lower surfaces of the two EVA resin layers.

Waterproof Sheet, Ethylene Vinyl Acetate Copolymer

Description

Waterproof sheet using ethylene-vinylacetate copolymer and its manufacturing method

1 is a partial cross-sectional view of the waterproof sheet of the present invention.

Figure 2 is a cross-sectional view showing a structure in which two adjacent waterproof sheet is connected according to an embodiment of the present invention.

The present invention relates to a non-exposed waterproof waterproof sheet and a method for manufacturing the same, which are used for waterproofing a building structure such as a general building or a rooftop, and an underground structure such as an underground exterior wall, a tunnel, a power plant, and an underground parking lot. Impregnating glass fibers between ethylene-vinyl acetate copolymer resin layers containing vinyl acetate and adhering the nonwoven fabric above and below the resin layer to form a waterproof sheet with excellent watertightness, excellent dimensional stability and workability by integrally bonding the entire waterproof sheet. It is about a method.

In addition to urethane waterproofing, asphalt waterproofing, and waterproofing of coatings as a waterproofing method for building structures, sheet waterproofing has advantages of being well adapted to external weather conditions and being easily constructed on site, such as synthetic rubber or synthetic resin. Synthetic polymer or rubberized asphalt is used as a main raw material to obtain a waterproof effect by successively disposing a waterproof sheet having a predetermined width and length of 0.8 to 3.0 mm in thickness.

Synthetic polymer waterproof sheet is divided into vulcanized rubber system, unvulcanized rubber system, vinyl chloride resin system, ethylene vinyl acetate resin system according to the main components, and homogeneous sheet and composite sheet according to the form. Recently, the dimensional stability, strength and mechanical properties of the sheet In order to improve physical properties, a composite sheet with fiber cloth or reinforcement cloth is widely applied.

Conventionally developed composite sheet waterproofing methods are mainly to prevent the structure from deteriorating due to cracks or leaks in the waterproofing layer due to continuous external impact on the building structure or changes in environmental conditions, and to improve construction economy and convenience. In addition to improving the physical properties of the waterproof sheet raw material itself, as well as improving the bonding structure of each component of the composite waterproof sheet.

Known as a related art in this regard is the Korean Patent No. 412935 (registered on Dec. 13, 2003) "Compound sheet waterproofing method and waterproofing method using the waterproofing material" and Patent No. 354191 (Registered on Sep. 12, 2002) "Waterproof use Sheet production method ".

First, the former is a composite sheet waterproofing material having excellent durability and dimensional stability and easy construction, comprising: a lower asphalt sheet including asphalt, SBS thermoplastic rubber, additives, and fillers; An upper sheet made of an ethylene vinyl acetate resin system including EVA or a rubber sheet including EPDM; And a reinforcing sheet (consisting of nonwoven fabric or fiberglass) arranged to hold both sheets integrally between the lower sheet and the upper sheet, and the upper sheet for integral bonding with adjacent composite sheets of the same configuration. Discloses a composite sheet waterproofing material characterized in that one end has an extended joint. The joints of the adjacent composite sheets in the above are arranged so that the joints are stacked on the upper surface of another adjacent composite sheet and heated with a hot air at 300-600 ° C. using a heat welding machine to press the surface of the facing sheets in a molten state. By doing so.

Ethylene vinyl acetate resin or EPDM rubber is selected as the upper material of the composite sheet, and underneath it is combined with the lower asphalt sheet through the nonwoven fabric or glass fiber reinforcement sheet. It was meaningful in that it was possible to connect the connection parts of other materials such as the connection section of the waterproof section and the asphalt sheet waterproof section of the ethylene vinyl acetate resin system, which were not available.

On the other hand, Patent No. 354191 is a 80-85% by weight of polyethylene and 15-20% by weight of acetic acid in the form of a powder in the hopper mixing step by applying heat; Continuously heating and transferring the gel EVA discharged through the outlet formed at the bottom of one side of the hopper by a heater to have a predetermined shape; While transferring the nonwoven fabric, glass fiber, EVA, and nonwoven fabric to the conveying part, a glass fiber having a mesh shape is placed on the upper surface of the EVA, and a nonwoven fabric is placed on the upper surface of the glass fiber and the bottom of the EVA, and then the crimping portion Impregnating by applying heat; And through the impregnation process non-woven fabric, glass fiber, EVA, the non-woven fabric is compressed in order to the heat of the sheet is cooled by a cooling unit using an air cooling method, the step of producing a sheet to be used for waterproof construction Disclosed is a method for manufacturing a waterproofing sheet.

This improves the problems of the conventional sheet waterproofing, that is, the disadvantages such as shrinkage deformation due to the temperature difference and leakage between the sheets and immersion, and in the case of waterproofing rubber material, it is exposed to solar heat and ultraviolet rays to repeat shrinkage and expansion. In order to solve the problem of cracks and cracks, EVA is used as the base material of the waterproof sheet, but the content ratio of polyethylene and acetic acid is 80-85% by weight: 15-20% by weight to provide stable strength for waterproofing. It is limited to, to attach the glass fibers to prevent the thermal deformation of the EVA, and to provide a non-woven fabric up and down these structures to improve the intimacy with the glass fiber and EVA, the bonding between the EVA resin layer and the non-woven fabric, glass fibers In order to apply heat.

However, in the above method, in providing the nonwoven fabric over the glass fibers, the possibility of forming a channel by weakening the adhesive force between the glass fibers and the nonwoven fabric by using only the heat provided by the heater for heating the gel EVA. As a result, there was a fear that the watertightness of the waterproof layer was lowered as well as the integral bonding force of the waterproof layer. In addition, although the ratio of polyethylene and acetic acid is only 80-85: 15-20, the cost reduction effect can be expected, but there is also a problem that the workability is inferior in flexibility in terms of physical properties such as tensile strength, elongation and low temperature bendability.

Therefore, the present inventors have completed the study on the improved waterproofing material and waterproof structure to overcome the problems in the conventional waterproofing method using the above-described sheet was completed the waterproof sheet and the manufacturing method of the present invention.

SUMMARY OF THE INVENTION An object of the present invention is to adopt an ethylene vinyl acetate copolymer resin (EVA) containing a high content of vinyl acetate as the main raw material of a waterproof sheet, thereby providing a waterproof sheet excellent in water properties and workability and excellent in watertight water tightness and a manufacturing method thereof. It is.

Another object of the present invention is to impregnate the glass fiber between the ethylene vinyl acetate copolymer resin layer and to adhere the non-woven fabric to the resin layer above and below the entire waterproof sheet is integrally combined waterproof waterproof and dimensional stability excellent waterproof sheet and its manufacturing method To provide.

In order to achieve the above object, the waterproof sheet of the present invention is different from 80-85% by weight of polyethylene and 15-20% by weight of acetic acid for EVA production in Patent No. 354191, unlike ethylene and water as the main raw material of the waterproof layer. Adopting vinyl acetate and preparing 50-60% by weight and 50-40% by weight, respectively, and mixing and melt-extruded while heating with a heater to obtain an EVA resin layer, while feeding the glass fiber between the two EVA resin layer, It is obtained by impregnating a nonwoven fabric on the upper and lower surfaces of the EVA resin layer.

That is, the waterproof sheet according to the present invention comprises two EVA resin layers composed of 50-60% by weight of ethylene and 50-40% by weight of vinyl acetate; A glass fiber layer provided between the EVA resin layers; And a nonwoven fabric layer provided on the upper and lower surfaces of the two EVA resin layers.

Method for producing a waterproof sheet according to the present invention, by mixing 50-60% by weight of ethylene and 50-40% by weight of vinyl acetate, melt-extruded EVA resin through a heated extruder, and supplied through two dies heated It is composed of supplying glass fibers between the two EVA resin layers to be impregnated, while providing a nonwoven fabric to the upper and lower outer surfaces of the two EVA resin layers.

EVA, which is the main raw material of the waterproof sheet of the present invention, is a polymer obtained by copolymerizing ethylene and vinyl acetate, and has excellent low-temperature heat sealing properties and crosslinking properties, so that it is not only general molded articles such as shoe sponges, daily necessities or toys, but also agricultural and food packaging films, It is used for various purposes such as raw materials of hot melt adhesives, waxes, modifiers, paints and the like, and its properties generally depend on the molecular weight and the content of vinyl acetate. In other words, increasing the vinyl acetate content improves density, rubber elasticity, flexibility, compatibility with other polymers and plasticizers, and lowers the curing temperature. Specifically, 10-20 wt% of vinyl acetate is used to improve moldability and low temperature flexibility by mixing with PVC and the like, and 25-30 wt% of vinyl acetate is added to the wax to be fragile and heat resistant. It is used to improve adhesiveness and the like.

In addition, EVA is excellent in bending stress and crack resistance as well as environmental stress cracking resistance (ESCR), excellent elasticity and repulsive force over a wide temperature range, excellent compatibility with the filler without causing deterioration of physical properties, the present invention It is suitable for use as the main raw material of waterproof sheet.

However, the waterproof sheet should not be twisted or bent according to the top and bottom balance of the sheet and inferior external environment, and the channel is formed by weakening the bonding strength of the reinforcement layer by being integrally combined with the reinforcement layer provided between the EVA resin layers and above and below the resin layer. In order to ensure excellent dimensional stability, tensile strength, and watertightness, the present invention uses acetic acid, such as 50-60% by weight of ethylene and 50-40% by weight of vinyl acetate, to form a waterproof sheet to ensure excellent dimensional stability, tensile strength, and watertightness. The vinyl content is greatly increased.

When the content of vinyl acetate is about 40-50% by weight, the physical properties such as the tensile strength of EVA is improved, the bonding strength with the reinforcing material layer combined with the EVA resin layer is increased, and the workability is also significantly increased.

In another aspect, the present invention provides a glass fiber as a reinforcing material between the EVA resin layer and takes the form of a multi-layer sheet comprising a nonwoven fabric up and down the resin layer, which is according to the prior art (for example, the domestic patent No. 354191). By providing a glass fiber over one EVA resin layer and providing a nonwoven fabric on each of the glass fiber upper part and the EVA lower part to form a sheet, when exposed to moisture, water enters through a reinforcement material and a water channel is formed. Easily peeled off and to improve the problem that the durability and mechanical properties are deteriorated.

That is, the EVA resin layer extruded at a high temperature through the screw of the extruder is provided from two dies to provide glass fibers between the two EVA resin layers, and at the same time, the impregnated nonwoven fabric up and down the outer side of the EVA resin layer Since the resin layer and the reinforcing material are integrally bonded, even if the sheet is exposed to moisture, there is no possibility that water flows through the reinforcing material to form a water channel, and EVA resin is wrapped around the upper and lower parts of the reinforcing material so that there is no room for peeling or leaving.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a partial cross-sectional view of the waterproof sheet of the present invention, Figure 2 is a cross-sectional view showing a structure in which two adjacent waterproof sheet is connected according to the present invention.

Waterproofing sheet of the present invention from the drawings is an EVA resin layer 10 obtained by copolymerizing ethylene and vinyl acetate; A glass fiber layer 12 provided at the center of the EVA resin layer 10; And it can be seen that the non-woven fabric layer 20 and 30 provided to the upper and lower surfaces of the EVA resin layer 10.

The waterproof sheet is mixed with 50 to 60% by weight of ethylene and 50 to 40% by weight of vinyl acetate, and then transferred to a hopper, and melt-extruded through a screw of an extruder heated by a heater to EVA resin (11). Is supplied through two dies, and the glass fiber 12 is supplied between the two EVA resins 11 while heating the dies, and the nonwoven fabric 20 and the upper and lower outer surfaces of the two EVA resins 11 are supplied. 30) by adhering.

In the waterproof construction using the waterproof sheet of the present invention, the waterproof sheet having the configuration of FIG. 1 should be continuously adjacent to the waterproof base surface. An embodiment of this is shown in FIG. 2. Here, the components of the adjacent waterproof sheet having the same configuration as the waterproof sheet of FIG. 1 are denoted by the reference numeral.

In order to closely connect the adjacent waterproof sheets of the same configuration as shown in FIG. 2, the nonwoven fabrics 20 and 30 provided above and below the EVA resin layer 10 are shortened by the length of the joint with the adjacent waterproof sheets. It should be cut and bonded. That is, the nonwoven fabrics 20 and 20 'adhered to the upper portions of the EVA resin layers 10 and 10' of each of the adjacent sheets are, for example, the length of the joint to the upper right side of the EVA resin layers 10 and 10 '. Insufficiently cut and bonded, and the nonwoven fabrics 30 and 30 'provided as the lower portions of the EVA resin layers 10 and 10' are cut and adhered to the lower left of the EVA resin layers 10 and 10 'by the length of the joints. Adjacent waterproof sheets are in contact with homogeneous EVA resin layers (10 and 10 ') at the joints, thereby enabling integral bonding at adjacent portions, and watertightness is ensured to prevent water leakage or peeling at adjacent portions. There is no room for this to happen.

In this way, when the waterproof sheet of the present invention is continuously disposed and the sheet waterproof to the waterproof base surface of the building structure is finished, the waterproof coating material is applied or pressed onto the upper surfaces of the nonwoven fabrics 20 and 20 'or the joints. Apply waterproofing finish.

As described above, according to the present invention, by adopting the EVA resin containing a high content of vinyl acetate as the main raw material of the waterproof sheet, the physical properties and workability is remarkably improved, and the waterproof sheet excellent in waterproof and watertightness, and a manufacturing method thereof.

In addition, according to the present invention by impregnating the glass fiber in the center of the EVA resin layer and by adhering the non-woven fabric on the resin layer up and down, the entire waterproof sheet is integrally combined to provide a waterproof sheet and a manufacturing method excellent in waterproof watertightness and dimensional stability. .

Claims (2)

A glass fiber layer is impregnated between two EVA resin layers composed of a mixture of 50-60% by weight of ethylene and 50-40% by weight of vinyl acetate, and a nonwoven layer is attached to the outer surfaces of the two EVA resin layers, respectively. Waterproof sheet. After mixing 50-60% by weight of ethylene and 50-40% by weight of vinyl acetate, melt-extruding the EVA resin through a heated extruder, and feeding the glass fibers between the two layers of EVA resin supplied through two heated dice. At the same time supplying, the manufacturing method of the waterproof sheet consisting of impregnating the non-woven fabric to the upper and lower outer surfaces of the two EVA resin layers.

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