KR100601236B1 - Alkali-proof glass fiber net and method for preparing the same - Google Patents

Abstract

The present invention relates to an alkali-resistant glass fiber net and a method for manufacturing the same, and more specifically, the outer diameter is in the range of 0.2 ~ 1.0mm, weaved with E-glass fiber with the same thickness of warp and weft, 20-40 mesh glass fiber The present invention relates to an alkali-resistant glass fiber net coated with an alkali-resistant polymer obtained by mixing ethylene vinyl acetate and melamine in a mesh and a method of economically manufacturing the same.

Fiberglass, mesh, EVA, melamine, dipping, coating

Description

Alkali-proof glass fiber net and method for preparing the same}

Figure 1 is a schematic diagram showing a simple structure of the glass fiber network made of 36 mesh in accordance with Example 1 of the present invention.

Figure 2 is a schematic diagram showing the structure of the alkali-resistant glass fiber network prepared according to Example 1 of the present invention coated with an alkali-resistant polymer.

The present invention relates to an alkali-resistant glass fiber net and a method for manufacturing the same, and more particularly, to fabricate a glass fiber net with a range of mesh nets with inexpensive E-glass fibers, and then dipped into an alkali-resistant polymer, followed by drying and curing. By doing so, the present invention relates to an alkali-resistant glass fiber net and a method for producing the same, which are intended to solve the problem that the glass fiber is eroded in alkali and lowers tensile strength, elasticity and other physical properties in a simple and economic way.

Inorganic glass fiber has excellent tensile strength and high elasticity, so it is attempted to be used as a reinforcement for insulating insulation of concrete structures or plates, but when used together with cement used when manufacturing insulating insulation for concrete structures or plates, Due to exposure to strong alkalis during the hydration of cement, the glass fiber itself is severely deteriorated, and there is a problem in that it is not eroded by alkali, thereby making it impossible to utilize properties as a reinforcing material.

Conventionally, glass compositions having increased zirconia (ZrO ₂ ) content of glass fibers have been proposed in order to take advantage of the excellent tensile strength and high elasticity of the glass fibers as described above (US Pat. No. 3,861,926, British Patent Publication No. 1243972, etc.). ). However, the glass composition according to the above patent has a high zirconia content, which increases alkali resistance, but has a drawback in that the radioactivity is rapidly weakened, and the material consumption of the melting furnace is extremely high and the amount of electric consumption is increased.

In addition, Korean Patent Publication No. 1981-00741 is a method of obtaining an alkali-resistant glass fiber by composition spinning the zirconia content to 19 to 23.5%, Korean Utility Model Publication No. 95-3929 or Korean Registered Utility Model No. 20-0207136 Alkali-resistant glass fiber (ARG) is used to import raw materials that are not domestically produced.

In addition, there are Japanese Patent Laid-Open Publication No. 2003-13352 and Japanese Patent Laid-Open Publication No. 2002-242447 using glass fiber nets, but all of them are methods using alkali-resistant glass fibers, and Korean Patent Publication No. 1981-00313 uses E-glass (E -Glass) It is economically pointed out because it is not made of alkali-resistant glass fiber net or coated with additives by chemical reaction to fiber and used as reinforcing fiber of cement.

On the other hand, an epoxy resin, a curing agent of an epoxy resin, a silane coupling agent containing an epoxy silane, an ethylene oxide adduct of bisphenol A, or a binding agent containing a nonionic surfactant of polyethylene glycol fatty acid ester is applied, such as alkali resistance or acid resistance. Although a technique for glass fibers having excellent chemical resistance and excellent by-product properties when wet nonwoven fabrics are disclosed in Korean Patent No.0404695, the technique is to prepare a glass fiber nonwoven fabric using a cut of the glass fibers. .

Therefore, there is a need in the art to solve a problem in which glass fibers are vulnerable to alkali so that the excellent tensile strength and elasticity of glass fibers can be applied as they are, and at the same time, the development of a method capable of satisfying the economics.

Accordingly, the inventors of the present invention have made research efforts to solve the above-mentioned problems. As a result, cheap E-glass fibers, which are easily obtained in Korea, are woven into a net having a predetermined mesh and dipped into alkali-resistant polymers. When dried and cured, multiple glass fibers can be combined into one strong glass fiber zone, and the fiber mesh is very strong at the point of connection between warp and weft yarns, such as using reinforcement as a reinforcement for concrete structures. It was confirmed that the best function can be provided, and the present invention was completed based on this.

Accordingly, it is an object of the present invention to provide a glass fiber net having improved alkali resistance by coating a glass fiber net having a specific structure with an alkali resistant polymer.

Another object of the present invention is to provide a method for producing the alkali-resistant glass fiber network in a simple and economic way.

Alkali-resistant glass fiber net of the present invention for achieving the above object is in the range of 0.2 ~ 1.0mm outer diameter, woven from E-glass fiber with the same thickness of warp and weft yarn ethylene vinyl acetate in 20-40 mesh fiberglass net It consists of a coating of an alkali resistant polymer mixed with (EVA) and melamine.

The method of manufacturing the alkali-resistant glass fiber net for achieving another object of the present invention is the step of weaving a glass fiber net of 20 to 40 mesh with a glass fiber having an outer diameter in the range of 0.2 ~ 1.0mm, the same thickness of the warp and weft And dipping the glass fiber net into an alkali resistant polymer mixed with ethylene vinyl acetate and melamine, followed by drying and curing.

Looking at the present invention in more detail as follows.

The present invention is woven by the same thickness of the glass fiber net with cheap E-glass fiber, then dipped in alkali-resistant polymer, dried and cured, the glass fiber is eroded in alkali, reducing tensile strength, elasticity and other physical properties The present invention relates to an alkali-resistant glass fiber net and a method for manufacturing the same, which are intended to solve the problem in a simple and economical manner.

Referring to the manufacturing method of the alkali-resistant glass fiber net of the present invention, first, the step of weaving the glass fiber network with E-glass fiber.

The E-glass fiber has an outer diameter ranging from 0.2 to 1 mm, wherein the outer diameter of the E-glass fiber is less than 0.2 mm, the strength of the glass fiber tissue is weak, and if the E-glass fiber exceeds 1 mm, the glass fiber tissue is between. There is a problem in that there is a gap in the glass fiber mesh is not good binding force with the blending raw material. In addition, in the present invention, the thickness of the warp yarn and the warp yarn of the glass fiber net is the same, in order to equalize the uniform structure and strength.

The glass fiber mesh is woven to 20 to 40 mesh, more preferably 30 to 36 mesh, and most preferably 36 mesh to be laminated with the cement mixture. At this time, the weaving method is to be made of plain weave, if the glass fiber mesh is less than 20 mesh wide spacing may weaken the reinforcing role of the glass fiber network itself, if the gap is narrower than 40 mesh applied glass fiber mesh There is a problem in that the compounding agent weakens the bonding strength of the compounding agent comes out between the glass fiber net.

Next, the glass fiber net is dipped in an alkali resistant polymer, followed by drying and curing.

As the alkali resistant polymer that can be used in the present invention, a mixture of ethylene vinyl acetate and melamine may be used. The amount of the ethylene vinyl acetate (EVA) is preferably 80 to 97% by weight, and if it is less than 80% by weight, the alkali resistance is lowered and the curing rate is faster, so that the coating cannot be performed. In addition, the amount of the melamine used is preferably 3 to 20% by weight, and less than 3% by weight is not good curability.

The glass fiber is sufficiently dipped in the alkali resistant polymer as described above, followed by drying and curing, wherein the drying and curing are performed at 50 to 70 ° C. At this time, if the drying and curing temperature is less than 50 ℃ takes a lot of time and does not sufficiently cure, if it exceeds 70 ℃ may be carbonized due to excessive heating.

According to the method of the present invention as described above it is possible to combine a plurality of glass fibers into one strong glass fiber zone, the fiber mesh is very strong in the point of connection between the warp and weft yarn is applied best when applied as a reinforcement of the concrete structure Can provide functionality.

That is, when the alkali-resistant polymer coated on the glass fiber net by heat treatment is dry cured, it is not eroded at all in an alkaline solution, and has excellent frictional resistance, so that it can be used safely in concrete pouring or lamination of insulating insulation. Glass fiber net according to the present invention can be applied to a variety of fiber reinforced products, such as insulating insulation, reinforcement of concrete structures, reinforcement of general industrial insulation.

In particular, in the case of applying the alkali-resistant glass fiber network of the present invention to an insulating insulating material used for industrial purposes, even if some of the magnetic iron contained in the glass fiber used, it can be used as a completely insulating glass fiber by coating the alkali-resistant polymer according to the present invention. The outer diameter of the glass fiber may be adjusted in the range of 0.3 to 0.6 mm, and woven into a mesh of 36 mesh to be used as a reinforcing material.

Even when the thickness of the fiber-reinforced product is less than 10 mm, it is better to arrange the alkali-resistant glass fiber network of the present invention near both outer walls of the fiber-reinforced product, and when the thickness of the fiber-reinforced product is relatively thick (40 mm or more), It is more effective to arrange two or more layers in multiple layers at intervals of 5 to 10 mm from both outer walls, and when applied to a concrete structure or the like, it is more effective to arrange two to three layers at the upper and lower outer shells.

Applying a certain amount of mortar in the formwork without using any steel reinforcement to the concrete structure, evenly planting the alkali-resistant glass fiber mesh of the present invention and replenishing the mortar by repeating the method of laminating the alkali-resistant glass fiber mesh It can be applied in a way.

In the lamination of the fiberglass net, the strength and the weight of the structure can be significantly reduced by stacking multiple layers of nets on the outer shell without using rebar. In addition, when applied to the bridge construction using reinforcing bar when the alkali-resistant glass fiber net according to the present invention in the upper and lower layers and finish the surface strength is improved and effective for many loads.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the scope of the present invention is not limited to the following Examples.

Example 1

Preparation of Alkali-resistant Glass Fiber Mesh Using EVA and Melamine Mixtures

Alkali resistance made by diluting 36 mesh glass fiber mesh woven from E-glass fiber having the same thickness as shown in FIG. 1 to about 50% by weight of water in a mixture of 90 parts by weight of EVA and 10 parts by weight of melamine. After dipping in the polymer solution, heat-treated at about 50-60 ° C., dried and cured to prepare an alkali-resistant glass fiber network as shown in FIG. 2.

Comparative Example 1

Weaving a 36 mesh glass fiber net with a weft of E-glass fiber with a thickness of about 0.26 mm, an E-glass fiber with a thickness of about 0.26 mm, and coating the glass fiber with a commonly applied acrylic resin. The net was prepared. The net was poor in the bonding portion of the fiber, the structure was not strong, and all eroded during the hydration reaction in the strong alkali.

Comparative Example 2

Even if the glass fiber network coated with alkaline solution is coated with a curing agent (melamine resin) ratio of 2% without using the method of Example 1, the coating film is weak, and the initial curing state seems to be preserved by the glass fiber, but the remaining cure proceeds. During this time, it erodes slowly and loses its function as a stiffener.

Experimental Example 1

Property measurement

The physical properties of the glass fiber nets prepared in Example 1 and Comparative Examples 1 and 2 were measured by the following methods, and the results are shown in Table 1 below.

division Example 1 Comparative Example 1 Comparative Example 2 Tensile Strength ¹⁾ ㎏f / 25㎡ slope 116.7 78.9 80.0 Weft 116.7 79.8 80.1 Alkali resistance ²⁾ pH 14 clear Eroded Slowly eroding Acid resistance ³⁾ pH 2 clear clear clear

1) Tensile Strength: Warp, Fill

2) Alkali resistance: After 10 days of hydration reaction at pH 14

3) Acid Resistance: Soak in pH 2 solution for 24 hours

As shown in Table 1, the alkali-resistant glass fiber network prepared according to Example 1 of the present invention is stronger than the strong alkali and no erosion at all than the glass fiber network without coating the alkali-resistant solution prepared according to Comparative Example 1 It showed that the characteristics, the glass fiber net prepared according to Comparative Example 2 can be seen that the difference in alkali resistance significantly than the glass fiber according to Example 1.

Example 2 and Comparative Examples 3 to 5

Manufacture of insulating insulation on plate

Example 2

In order to form a plate of a certain size, a mold is installed at the bottom of the hydraulic press, a dewatering cloth is installed at the bottom of the mold, and dry mixing Portland cement and sepiolite at a weight ratio of 60:35 and then about 15 weight ratio of the mixed raw materials. The raw material of which EVA was diluted with an appropriate amount of water without a curing agent and wet mixed was uniformly applied to a thickness of about 8 mm. Here, the alkali-resistant glass net prepared in Example 1 was rubbed and rubbed well to repeat the method of uniformly replenishing the blended raw material with a thickness of about 8 mm and laminating it to a thickness of 20 mm of insulating insulating material, followed by pressure molding. After curing, the surface was polished to prepare a plate-shaped insulating insulating material.

Comparative Example 3

Comparative Example 3 is a physical property of asbestos cement plates for electrical insulation of general KSC 2346, which does not use the alkali-resistant glass fiber net of Example 1, and Comparative Example 4 is generally used as a reinforcing material glass fiber net in the market Comparative Example 5 is a physical property value of the insulating insulating material prepared by the poor curing of Comparative Example 2.

Experimental Example 2

Comparison of Properties of Insulation Material

The physical properties of the insulating insulating material prepared according to Example 2 and Comparative Examples 3 to 5 were measured by the following method, and the results are shown in Table 2 below.

Flexural Strength: KSC 2346

2. Impact resistance: KSC 2346

3. Alkali resistance: measured 10 days after hydration of pH 14

4. Erosion of glass fiber: Observed 10 days after hydration reaction at pH 14.

5. Absorption rate: KSC 2346

division unit Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Flexural strength Kgf / 25mm2 6.0 2.8 2.8 3 Impact resistance Kgf / 25mm2 4.8 2 2 2.1 Alkali resistance Hydration reaction at pH 14 No erosion No erosion corrosion Slowly eroding Whether the fiberglass network is eroded Post-curing observation Fibrous tissue maintained Can not be used as a carcinogen No fibrous tissue Loss of fiber function Water absorption % 5 18 20 15

As shown in Table 2, the plate-shaped insulating heat insulating material prepared according to Example 2 of the present invention uses a glass fiber net as an alkali-resistant polymer, and diluted about 15 weight ratio of EVA of the mixed raw materials with an appropriate amount of water without a curing agent. When used, it is compatible with EVA coated on glass mesh, so it has good bond with glass mesh and raw material, and it is a good product of electrically insulating insulation material by minimizing voids and reducing water absorption. Therefore, compared with Example 2, the plate-shaped product using the coated glass net with a large difference in Comparative Examples 3 to 5 is used semi-permanently because it does not break off even under severe external shocks, and it is also advantageous in economics.

As described above, according to the present invention, commercially available alkali-resistant glass fibers in a simple and economical way of woven glass fiber net using cheap E-glass fiber and then coated with an alkali-resistant polymer of EVA. Alkali-resistant glass fiber net can be manufactured, and it is not eroded by alkali and has excellent physical properties such as flexural strength, breaking strength, alkali resistance, etc. Effective as a reinforcing material. In addition, when used as a substitute for reinforcing concrete structures, it is the strongest structure and can be used for earthquake resistance or lightening of bridges and high-rise buildings.

In addition, the glass fiber is produced in large quantities in Korea, but the alkali-resistant glass fiber with excellent physical properties is not produced at all because it does not solve the problem of economic aspects, but according to the present invention, it is possible to manufacture cheaper and simpler as described above. By eliminating the effect can be used to produce and use a glass fiber product having excellent alkali resistance.

Claims (6)

The outer diameter is in the range of 0.2 ~ 1.0mm, woven with E-glass fiber of the same thickness as the warp and weft yarn, characterized in that the alkali-resistant polymer coated with ethylene vinyl acetate and melamine in a glass fiber mesh of 20 to 40 mesh Alkali-resistant fiberglass net. The alkali-resistant glass fiber net according to claim 1, wherein the glass fiber net is 30 to 36 mesh. The alkali-resistant glass fiber net according to claim 1, wherein the mixing ratio of ethylene vinyl acetate is 80 to 97% by weight and melamine is 3 to 20% by weight. Weaving a 20-40 mesh fiberglass net with a glass fiber having an outer diameter ranging from 0.2 mm to 1.0 mm and having the same thickness as the warp and weft yarn, and And dipping the glass fiber net in an alkali resistant polymer mixed with ethylene vinyl acetate and melamine, and then drying and curing the glass fiber net. The method of claim 4, wherein the mixing ratio of ethylene vinyl acetate is 80 to 97% by weight, and melamine is 3 to 20% by weight. 5. The method of claim 4, wherein the drying and curing steps are performed at 50 ° C. to 70 ° C. 6.

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