KR101539334B1 - Protection sheet for preventing frost damage of tree and Manufacturing method thereof - Google Patents

Abstract

The present invention relates to a protective sheet for preventing frost damage of trees and, more specifically, relates to a protective sheet having a structure in which fiber materials are laminated on both surfaces of padding cotton and bound by a high-frequency welding system. The present invention relates to the protective sheet for preventing frost damage of trees with excellent wind prevention, thermal insulation, and light shielding properties in order to prevent frost damage occurring in trees.

Description

[0001] The present invention relates to a protective sheet for preventing frost damage to trees and a manufacturing method thereof,

More particularly, the present invention relates to a protective sheet for preventing frost damage to trees, and more particularly, to a protective sheet for preventing frost damage to trees, more specifically, a structure in which a fibrous material is laminated on both sides of a padding pad and is fastened with a high frequency welding system. The present invention relates to a protective sheet for preventing frost damage to trees.

The East Sea is affected by low temperature during the forest weather damage and varies depending on the cause, species, occurrence time and place of the damage. In Korea, the minimum temperature is higher than that in the continental continent, which is at the same latitude in the winter. However, the East Sea is more likely to occur due to the large temperature variation due to the continental climate. Also, because of the vertically complicated terrain, the temperature changes locally and the direction and strength of the wind are varied.

Injury that occurs when a plant is exposed to low temperatures above freezing is called cold weather. Plants that are dead by this phenomenon are called cold susceptible plants. For example, bananas appear at 12 ° C, lemons at 10 ° C, and apples at 4 ° C or lower, and symptoms such as discoloration and surface patterns typically found in cucumber And necrosis.

It is called the East Sea (year) that the temperature is low in winter and the crop appears to be below the freezing point of damage. The East Sea mainly occurs during the winter, which is the resting period of the tree, from autumn until the next spring. The cause of the damage is the low temperature of 0 ℃ or less, and the water inside the plant cell and the cell or the cell is frozen. When the water is frozen, the water is not returned to its original state even if it is frozen because the temperature rises again. Therefore, the biochemical metabolism can not be performed in the cell, and the cell is wilted or dies, resulting in damage. There is a difference in the East Sea marginal temperature by species and species, but many crops are usually damaged by sudden temperature drops or considerably long periods of low temperatures. If a warm day continues for a few days and the temperature suddenly drops, the damage is greater.

Examples of methods for preventing such cold weather and frost damage include a method of raising the temperature artificially by a heat generating material, a method of using radiation, and a method of preventing wind blowing. A method of raising the temperature by a heating material such as the Korean Patent Registration No. 10-0690076 is a method of burning heavy oil or solid fuel using a heater, but the warmth is excellent but it is expensive and can not be used in a wide area. There are two ways to block the winds: by installing a room or windshield, to block the flow of cold air or to control the direction. There is a coating method to prevent radiation and wind. This coating method has a different thermal effect depending on the coating method.

Coating methods include coating with white paint, coating with newspaper, and coating method using heat insulating material. The method of applying the white paint is a method of retarding the movement of the liquid by blocking the temperature rise of the tree by reflecting light by using a white water paint. But white paint alone is insufficient in warmth. The coating method using newspaper is excellent in workability but lacks durability and warmth.

Korean Patent Publication No. 10-1133258 discloses a method of preventing or minimizing damage to the East Sea by using a spunbonded nonwoven fabric using polypropylene filament yarn as a coating method using a thermal insulation material. However, this method has a single structure of spunbonded nonwoven fabric It is difficult to prevent the frost damage due to the temperature difference between day and night. In addition, Korean Patent Registration No. 10-1383936 discloses a method of preventing frost damage and cold weather by bonding an aluminum foil coated with a PET film to a fiber material. However, there is a problem that it is difficult to apply it to mass production due to cost increase due to the cost of the raw material by covering the film with the metal thin film and bonding the fiber material.

Korean Registered Patent No. 10-1133258 (Mar. 28, 2012) Korean Registered Patent No. 10-1383936 (Apr.

Accordingly, the present inventors have made efforts to produce a new wood protection material that can prevent frost damage on the tree, and as a result, it has been found that the stitch point can be minimized to improve the heat retention by increasing the moisture content of the sheet. A sheet-shaped protective material having superior effects while solving the problems has been developed. That is, the present invention provides a protective sheet for preventing frost damage on trees and a method for producing the same.

In order to solve the above-described problems, the present invention is directed to a protective sheet for preventing frost damage, comprising a first nonwoven fabric layer 12, a padding layer 13, a second nonwoven fabric layer 22, Are stacked.

As a preferred embodiment of the present invention, the protective sheet for anti-tree frost protection according to the present invention comprises a first nonwoven fabric layer 12, a padding layer 13, a second nonwoven fabric layer 22 and a fabric layer 21, . ≪ / RTI >

As another preferred embodiment of the present invention, the protective sheet for preventing frost damage to trees of the present invention may be characterized in that a first fabric layer 21, a padding layer 13 and a second fabric layer 32 are laminated in order have.

As a further preferred embodiment of the present invention, in the protective sheet for preventing frost damage of the present invention, the fabric layer is formed on the first fabric layer 21 and / or the second fabric layer 32 and the padding- And a silver coating layer 31 on the other surface of the substrate.

According to another aspect of the present invention, there is provided a method of manufacturing a protective sheet for preventing frost damage, comprising the steps of: laminating a first nonwoven fabric layer, a padded cotton layer and a second nonwoven fabric layer sequentially; And a second step of laminating a fabric layer having a breathable and waterproof film layer, a woven fabric layer or a silver coating layer on the upper surface of the second nonwoven fabric layer, followed by high frequency welding to bond the respective layers.

The protective sheet for preventing frost damage in the present invention minimizes the stitch point to improve the warmth of the protective sheet by increasing the inclusion rate of the protective sheet and reflects and scatters sunlight by introducing a silver coated fabric to increase the surface temperature of the tree during the day It is possible to prevent the occurrence of the frost damage due to the sudden temperature change at night. In addition, it is an invention that can prevent secondary damage by coating moisture permeable waterproof film to smoothly discharge water generated due to the growth of trees to prevent condensation.

1 is a perspective view and a cross-sectional view of a protective sheet for preventing frost damage to trees according to a first embodiment of the present invention.
2 is a perspective view and a cross-sectional view of a protective sheet for preventing tree frost damage according to Embodiment 2 of the present invention.
3 is a perspective view and a cross-sectional view of a protective sheet for preventing tree frost damage according to Embodiment 3 of the present invention.
4 is a perspective view and a cross-sectional view of a protective sheet for preventing tree frost damage according to Embodiment 4 of the present invention.

As used herein, the term "breathable waterproof film" is meant to include both breathable waterproof fabric, breathable waterproof laminate or breathable waterproof laminate fabric.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a protective sheet for preventing frost damage on a tree, wherein a protective sheet is formed by laminating a breathable waterproof film or a fibrous material such as a nonwoven fabric for expressing functionality on both sides or one side with a padding pad therebetween, High frequency welding is performed.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a protective sheet for preventing frost damage according to the present invention will be described in detail with reference to the accompanying drawings.

(Hereinafter referred to as a protective sheet) of the present invention further comprises at least one functional layer selected from a fabric layer, a breathable waterproof film layer and a silver coating layer on one or both sides of a base layer .

1 to 4, when the protective sheet of the present invention is applied to a tree, the base layer 1 from the direction of the tree is formed of the first nonwoven fabric layer 12, the padding layer 13, The nonwoven fabric layer 22 may be stacked one after the other or the first fabric layer 21, the padding layer 13 and the second fabric layer 32 may be stacked one after the other, The fabric layers 21 and 32, the padding layer 13 and the nonwoven layers 12 and 22 are stacked in this order on the upper and lower layers 12 and 22, the padding layer 13 and the fabric layers 21 and 32, May be stacked in this order.

1, the protective sheet of the present invention comprises a first nonwoven fabric layer 12, a padding layer 13, a second nonwoven fabric layer 22, and a breathable waterproof film layer (not shown) 11) may be stacked in this order. Further, the protective sheet of the present invention in the form shown in Fig. 1 may further include a silver coating layer 31 on the lower end surface of the first nonwoven fabric layer 12 and / or the upper surface of the moisture permeable waterproof film layer 11 have.

In another preferred embodiment of the present invention, the protective sheet of the present invention comprises a first nonwoven layer 12, a padding layer 13, a second nonwoven layer 22, and a fabric layer 21 And the protective sheet of the present invention as shown in FIG. 2 may be formed by stacking a silver coating layer 31 on the lower surface of the first nonwoven fabric layer 12 and / And may further be included in the upper surface. The protective sheet of the present invention in the form shown in FIG. 2 may further include a moisture permeable waterproof film layer. The moisture permeable waterproof film layer 11 is formed between the fabric layer 21 and the silver coating layer 31 Or may be formed between the second nonwoven fabric layer 22 and the fabric layer 21 or may be formed on the top surface of the fabric layer 21.

In another preferred embodiment of the present invention, the protective sheet of the present invention comprises a first fabric layer 21, a padding layer 13, a second fabric layer 32, The silver coating layer 31 may be formed on the lower surface of the first fabric layer 21 and / or on the upper surface of the second fabric layer 32, As shown in FIG. In addition, the protective sheet of the present invention in the form shown in Figs. 3 and / or 4 may further comprise a breathable waterproof film layer comprising a first fabric layer 21, a padding layer 13, a second fabric layer 32 and the moisture permeable and waterproof film layer 11 are laminated in this order or the moisture permeable and waterproof film layer is formed between the second fabric layer 21 and the silver coating layer 31.

In the protective sheet of the present invention having various structures as described above, it is preferable that the nonwoven fabric layer (including the first nonwoven fabric layer and the second nonwoven fabric layer) has an average thickness of 100 mu m to 140 mu m, preferably 100 mu m to 120 mu m At this time, if the average thickness of the nonwoven fabric layer is less than 100 탆, durability may be deteriorated. If the average thickness exceeds 140 탆, air permeability may be decreased, which may hinder the growth of the wood. The nonwoven fabric layer may be selected from the group consisting of a polyester nonwoven fabric, a nylon nonwoven fabric and a polyester / nylon spunbond nonwoven fabric. The nonwoven fabric may have a weight of 40 to 100 g / m ² , preferably 50 to 80 g / m 2 It is preferable to use a nonwoven fabric having a weight of ² . When the nonwoven fabric having a weight of less than 40 g / m ² is used, there may be a problem that the density of the nonwoven fabric is insufficient to exhibit a warming property. If the nonwoven fabric has a weight of more than 100 g / m ² , permeation of moisture and air is not smooth. There may be a problem that the condensation phenomenon occurs and the growth of the plant is disturbed.

Since the higher the moisture content of the fiber is, the better the warmth is obtained. Therefore, in the fusing of the protective sheet using the high-frequency fusing system, the stitch point is minimized to increase the moisture content of the fabric, thereby improving the warmth. In the present invention, In the present invention, the padding layer is composed of a polyester padding cotton, and may include a padding cotton having a weight of 4 to 6 oz. At this time, if the weight of the padding cotton is less than 4 oz, there may be a problem of insufficient warmth. If the weight of the padding cotton is more than 6 oz, it may be difficult to melt in the high frequency welding step. .

In the present invention, the fabric layer is made of one type of fabric selected from polyester, nylon or polyester / nylon fabrics of Oxford fabric using yarns of over 200 D, preferably polyester / nylon fabrics, Can be formed. The fabric layer (including the first fabric layer and the second fabric layer) is preferably formed to have an average thickness of 90 to 130 탆, preferably 90 to 120 탆, and more preferably 95 to 110 탆 .

In the present invention, by forming a silver coating layer, sunlight is reflected and scattered in the daytime, so that temperature rise inside the protective sheet due to sunlight It is possible to prevent the frost damage due to the sudden temperature change by reducing the temperature difference with the nighttime temperature. The silver coating means a coating of silver coating with a blend of silver toner on a polyurethane. The silver coating layer comprises 10 to 30 parts by weight of an organic solvent and 5 to 15 parts by weight of a silver pigment, based on 100 parts by weight of the polyurethane resin. , Preferably 12 to 25 parts by weight of an organic solvent, and 5 to 10 parts by weight of a silver pigment. Here, the organic solvent may be a ketone-based organic solvent containing at least one selected from the group consisting of methylethylketone, acetone, diethylketone, and methylisobutylketone. The silver pigment may be at least one pigment selected from organic pigments and inorganic pigments containing metal particles. If the amount of the silver pigment is less than 5 parts by weight, the amount of the silver pigment to be used is too small to reduce the effect of introducing the silver coating layer. If the silver pigment is used in an amount exceeding 15 parts by weight, .

The silver coating layer is preferably formed to have an average thickness of 20 to 50 탆, preferably 25 to 40 탆, more preferably 25 to 35 탆, wherein the average thickness of the silver coating layer is 20 It is too thin to allow the silver coating layer to easily peel off and / or disappear, and it is preferable that the silver coating layer is formed to have the above thickness because it is uneconomical that the average thickness exceeds 50 mu m.

In the present invention, the moisture permeable, waterproof film resin used for producing the moisture permeable waterproof film layer may be a polyurethane resin; Organic solvent; diluent; And 5 to 30 parts by weight of the above-mentioned solubilizer, preferably 5 to 30 parts by weight of the organic solvent, 10 to 50 parts by weight of the diluent, and 5 to 30 parts by weight of the solubilizer, based on 100 parts by weight of the polyurethane resin, 5 to 25 parts by weight, 10 to 40 parts by weight of the diluent and 5 to 25 parts by weight of the solubilizer. The additive such as a surfactant, a crosslinking agent, a catalyst, a stabilizer, and a filler may be added in an amount of 1 to 20 parts by weight based on 100 parts by weight of the polyurethane resin within a range that does not adversely affect the proper physical properties of the moisture permeable and waterproof film.

The organic solvent may be at least one selected from the group consisting of methylethylketone, acetone, diethylketone, and methylisobutylketone.

The diluent is preferably one having a boiling point and a low surface tension higher than that of the organic solvent. Specific examples of the diluent include toluene, xylene, and benzene. It is preferable to use an aromatic compound containing at least one species.

The dissolving agent may be at least one selected from the group consisting of dimethylformamide, dimethylacetamide and N-methylpyrrolidone.

The solubilizer preferably has a boiling point higher than that of the diluent and a high surface tension. Specific examples thereof include dimethylformamide, dimethylacetamide, and N-methylpyrrolidone (N -Methyl Pyrrolidone) is preferably used as the amide-based solvent.

The polyurethane resin used for preparing the breathable waterproof film resin may have an NCO index of 30 to 65, and preferably an NCO index of 35 to 50. [ The polyurethane resin is obtained by reacting a mixture of 15 to 45% by weight of polyol, 20 to 40% by weight of diisocyanate, 5 to 15% by weight of chain extender and 10 to 30% by weight of organic solvent As the chain extender, those generally used in the art of polyurethane production can be used. Ethylene glycol, 1,4-butylene glycol, 1,4-butylene glycol, Glycols containing at least one selected from 1,6-hexamethylene glycol; And diamines containing at least one selected from the group consisting of ethylene diamine (EDA), 4,4-diphenyl methane diamine (MDA), and isophorene diamine (IPDA); May be used.

The organic solvent having a polyurethane resin composition may be a ketone-based organic solvent containing at least one selected from the group consisting of methylethylketone, acetone, diethylketone, and methylisobutylketone; Ether-based organic solvents containing at least one selected from the group consisting of tetrahydrofuran, 1,4-dioxane and oxetane; And petroleum ether; May be used. Here, the petroleum ether may be composed of pentane or hexane, which is a volatile petroleum oil having a boiling point of 30 ° C to 70 ° C.

The moisture permeable waterproof film layer may be formed to have an average thickness of 200 to 240 μm, preferably 210 to 230 μm, more preferably 210 to 220 μm, and the average thickness of the moisture permeable waterproof film layer When the average thickness is more than 240 탆, the waterproofing property is good. However, since the moisture permeability is decreased, it is preferable to have a thickness within the above range.

The method for forming the moisture permeable waterproof film layer includes the steps of mixing and stirring the polyurethane resin, an organic solvent, a diluent, and a dissolving agent to prepare a moisture permeable waterproof film resin; Casting the breathable waterproof film resin to a substrate; And drying the substrate on which the breathable and waterproof film resin is cast at 80 ° C to 160 ° C to form a breathable waterproof film layer. The substrate may be the nonwoven fabric (12, 22) and / or the woven fabric (21, 32) constituting the protective sheet of the present invention. Thus, the moisture permeable, waterproof film resin may be cast directly onto the nonwoven fabric and / To form a breathable waterproof film layer.

Alternatively, the breathable and waterproof film resin may be formed into a film and then laminated on the nonwoven fabric and / or the fabric to form a breathable waterproof film layer. When forming the moisture permeable and waterproof film layer after filming without directly casting on the nonwoven fabric and / or the fabric, the base material is one having a surface tension lower than that of one of the components of the breathable and waterproof film resin It is preferable to use one kind selected from a release paper having a silicone surface layer, a release paper having a polypropylene surface layer, a polypropylene film and a polyester film, in view of obtaining a cast film uniformly spreading a moisture- , More preferably the substrate is a substrate having a surface tension of 45 dyne / cm or less and having a silicone surface layer having a surface tension of 15 to 30 dyne / cm, a release sheet having a polypropylene surface layer having a surface tension of 20 to 40 dyne / , A polypropylene film having a surface tension of 20 to 40 dyne / cm and a polyester film having a surface tension of 25 to 40 dyne / cm It is good to do. When the moisture permeable, waterproof film resin is cast on a substrate having such a low surface tension as possible, the surface tension of the moisture permeable and waterproof film resin is low immediately after the application, so that the moisture permeable, waterproof film resin can be uniformly spread on the substrate . The surface tension of the base material and the moisture-permeable and waterproof film resin is S, the surface tension of the base material is S, the surface tension of the moisture permeable, waterproof film resin immediately after the application is S1, the PU after the organic solvent or diluent is evaporated preferentially during the drying process When the surface tension of the mixed solution cast film is represented by S2, the surface tension relationship becomes S> S1 immediately after application and S <S2 in the drying process. When the above conditions are satisfied, the obtained film is uniformly solidified on the substrate, and therefore, the film layer and the inner layer are both dense because they have a nonporous membrane structure, preferably a nonporous monolith membrane structure. On the other hand, A moisture permeable waterproof film having little fine pores can be obtained.

The moisture permeable, waterproof film resin is preferably applied to a substrate whose solubility parameter is lower than the solubility parameter of the polyurethane resin (about 10 cal ^1/2 / cm ^3/2 ). That is, when a film of polyester or nylon is used as a base material, the solubility parameter of the base material becomes larger than that of the polyurethane resin, and the tendency of the base material to attract and attach the polyurethane resin of the moisture permeable and waterproof film resin becomes larger, It may become non-uniform. Here, the solubility parameter (?) Is the square root of a value obtained by dividing the cohesive energy by the molecular sieve and is represented by the following formula (1).

[Chemical Formula 1]

? = (E / V) ^1/2

In the above formula (1), E is the intermolecular cohesive energy and V is the molecular sieve.

According to KLHoy (Journal of Paint Technology, Vol. 42, No. 541, 1970), a polar solvent such as water has a large cohesive energy E (cohesive force) between molecules and a small molecular volume V The solubility parameter? Is large. On the other hand, a nonpolar solvent such as hexane has a small cohesive energy between molecules (cohesive force is small) and a large molecular volume, so the solubility parameter becomes small. The relationship between the surface tension and the solubility parameter of the substrate, the solubility parameter of the polyurethane resin, the surface tension of the organic solvent, and the like in the formation of the membrane described above are summarized in Table 1 below.

division nylon
film Polyester
film Polypropylene
Release paper silicon
Release paper MEK toluene DMF Surface tension
(dyne / cm) 41 39 31 22 24 28 35 Solubility parameter
(cal ^1/2 / cm3 / ² ) 13.6 10.7 8 7.4 9.4 8.9 11.7 Double-sided uniformity usually usually Great Great Great Great Great

The viscosity of the moisture permeable, waterproof film resin is preferably adjusted to 500 cps to 10,000 cps at the time of casting to the substrate. If the viscosity is less than 500 cps, membrane formation is difficult, pores are formed, If the viscosity is higher than 10,000 cps, it is difficult to form a uniform film, and it may become uneven and the moisture permeability may be lowered.

The casting method may be performed by a method commonly used in the art and is not particularly limited, but may be performed using a doctor knife coater, a roll coater, a dot, or the like .

In addition, the step of drying may be carried out by continuously drying at a temperature of 70 ° C to 170 ° C, preferably at a temperature of 80 ° C to 160 ° C, more preferably at a temperature of 85 ° C to 160 ° C, This will be described in more detail as follows.

PU mixture liquid is applied on the substrate, the PU mixture liquid is uniformly coated on the substrate. In this state, in the initial drying step, the organic solvent is dried at a temperature not higher than the boiling point of the organic solvent, for example, at a drying temperature of less than 90 ° C, preferably at a drying temperature of 80 ° C to 90 ° C for a drying time of 30 seconds to 120 seconds. In this case, the low-boiling organic solvent (for example, MEK) is preferentially evaporated and the PU mixture liquid on the coated substrate starts to be concentrated. In the PU mixture liquid, a large amount of diluent (for example, toluene) . Next, in the middle-stage drying step, the drying is carried out at a temperature not higher than the boiling point of the diluent, for example, at a drying temperature of less than 120 ° C, preferably 90 ° C to 120 ° C for 30 seconds to 120 seconds. During this mid-stage drying process, the PU mixture is concentrated, the surface tension is increased, and the cohesive force is increased. In the latter drying step, the drying is carried out at a drying temperature of 110 ° C or higher, preferably 110 to 170 ° C, more preferably 110 to 160 ° C for 30 to 120 seconds. The remaining diluent and solubilizer are evaporated during the late drying process, and a uniform, nonporous membrane, preferably a nonporous monolith membrane, is formed and solidified and stabilized in the form of a film as it solidifies.

In this way, the moisture permeable and waterproof film is a monolith membrane having no fine pores having a diameter of 0.1 占 퐉 or more on either one or both surfaces, and the size of the fine pores is uniform in the thickness direction of the film.

The moisture-permeable, waterproof film layer of the present invention may have a water vapor permeability of 800 g / m ² / h to 2,000 g / m ² / h measured according to JIS L-1099 (method B-1) g / m ² / h to 1,600 g / m ² / h. Further, the moisture-permeable waterproof film layer has a JIS L-1092 was (high water pressure method) Fig domestic _{2,000 ㎜H 2 O ~ 15,000 ㎜H 2} O as measured in accordance with, preferably domestic Fig 4,000 ㎜H ₂ O ~ 12,000 &lt; RTI ID = 0.0 &gt; mmH20. &Lt; / _RTI &gt; The breathable and waterproof film layer may have an air permeability of 5 seconds to 80 seconds, preferably 10 to 65 seconds, when measured according to JIS L-1096.6.27.2B (phlegm type method).

The above-described protective sheet for preventing frost damage to trees of the present invention can be laminated by subjecting a nonwoven fabric, a padding pad, and a fabric to high-frequency welding using a high-frequency fusing system. The nonwoven fabric and / or the woven fabric may be coated on one side with at least one selected from a breathable waterproof film resin and a silver coating agent, and the silver coating agent may be coated by a direct coating technique to form a silver coating layer.

An example of producing the protective sheet for anti-tree frost protection of the present invention includes a first step of sequentially laminating a first nonwoven fabric layer, a padded cotton layer and a second nonwoven fabric layer; And a second step of laminating a moisture-permeable waterproof film layer, a woven fabric layer or a woven fabric layer formed with a silver coating layer on the upper surface of the second nonwoven fabric layer, followed by high-frequency fusion bonding the respective layers to each other . The high-frequency welding in the second step can be performed by using a high-frequency wave of 15,000 to 20,000 Hz intensity so as to have a rhombic appearance such as a running stitch. In this case, when the high frequency intensity is less than 15,000 Hz, the fusion bonding is not performed and the interlayer coupling force may be lowered. When the high frequency intensity is higher than 20,000 Hz, there is a problem that the protection sheet is damaged due to excessive melting.

According to the KS K ISO 11092: 1993 method described above, the protective sheet for preventing frost damage on the plant according to the present invention has a thermal resistance value of 0.400 to 1.200 m ² K / W, preferably 0.450 to 0.800 m ² K / W , More preferably 0.540 to 0.800 m &lt; ² &gt; · K / W.

It is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It is provided to let you know.

[Example]

Preparation Example 1: Preparation of waterproofing waterproof film

26 wt% of polyether polyol, 24.5 wt% of diisocyanate, 5.5 wt% of ethylene glycol as chain extender, 26 wt% of polyethylene glycol (PEG) and 42 wt% of methyl ethyl ketone as organic solvent were mixed and reacted to prepare polyurethane resin NCO index = 38).

Next, 18 parts by weight of methyl ethyl ketone as an organic solvent, 23 parts by weight of toluene as a diluent, and 12 parts by weight of dimethylformamide as a dissolving agent were mixed with 100 parts by weight of the polyurethane resin to obtain a breathable waterproofing layer having a viscosity of 2,950 cps To prepare a film resin.

Next, the moisture permeable, waterproof film resin was cast on a silicone release paper having a surface tension of 22 dyne / cm and a solubility parameter of 7.4 cal ^1/2 / cm ^3/2 with a doctor knife coater.

Next, primary drying was performed at 80 ° C for 30 seconds, secondary drying was performed at 120 ° C for 30 seconds, and tertiary drying was continuously carried out at 160 ° C for 30 seconds to obtain a moisture permeable waterproofing layer having an average thickness of 215 μm A film was prepared.

Experimental Example 1: Measurement of physical properties of moisture-permeable waterproof film

The water permeability, moisture permeability and air permeability of the moisture permeable, waterproof film prepared in Preparation Example 1 were measured, and the results are shown in Table 2 below.

The water permeability was measured according to IS L-1099 (B-1 method) and the air permeability was measured according to JIS L-1096.6.27.2B (sputum type) Method).

division Water resistance (mmH ₂ 0) Water vapor permeability (g / m 2 / h) Aperture (sec) Preparation Example 1 6,250 1,320 16 seconds

Preparation Example 2: Preparation of silver coating agent

25 parts by weight of methyl ethyl ketone as an organic solvent and 8 parts by weight of a silver color organic pigment were mixed with 100 parts by weight of the polyurethane resin of Preparation Example 1 to prepare a silver coating resin having a viscosity of 3,600 cps at 25 ° C.

Example 1: Protective sheet for preventing frost damage on a tree containing moisture permeable waterproof film

(100% polyester, weight: 70 g / m ² ) having an average thickness of 120 탆 was laminated on both sides of a padding cotton (weight 5 oz) having an average thickness of 3 mm so that the order of the first nonwoven fabric layer-padding- Then, a moisture-permeable and waterproof film having an average thickness of 215 μm prepared in Preparative Example 1 was laminated on the upper surface of the second non-woven fabric layer, followed by binding each layer with a high frequency welding method (high frequency intensity 16,500 to 17,000 Hz) To prepare a protective sheet for anti-freeze. Fig. 1 shows the drawing.

Example 2: Protective sheet for preventing frost damage on a tree containing fabric

(100% polyester, weight: 70 g / m ² ) having an average thickness of 120 탆 was laminated on both sides of a padding cotton (weight 5 oz) having an average thickness of 3 mm so that the order of the first nonwoven fabric layer-padding- Then, a nylon fabric (210D yarn) having an average thickness of 100 mu m was laminated, and then each layer was bonded with a high-frequency welding method (high frequency intensity 17,200 to 17,400 Hz) to prepare a protective sheet for preventing frost damage to trees . FIG. 2 shows the drawing.

Example 3: Protective sheet for preventing frost damage on a tree containing a silver-coated fabric

(1) The silver coating material prepared in Preparative Example 2 was coated on one side of polyester fabric (210D yarn) having an average thickness of 120 占 퐉 in an average thickness of 27 占 퐉 by direct coating to prepare a fabric coated with a silver coating layer .

(2) Next, a polyester fabric (210D yarn) having an average thickness of 120 占 퐉 was laminated on one side of a padding cotton (weight 5 oz) having an average thickness of 3 mm, and the silver coating layer The coated fabrics are laminated in order of the first fabric layer-padding layer-second fabric layer-silver coating layer, and then each layer is bonded by high frequency welding (high frequency intensity 17,500 to 17,700 Hz) To prepare a protective sheet. Fig. 3 is a view showing the same.

Example 4: Protective sheet for preventing frost damage on a tree containing a silver-coated fabric 2

(1) The silver coating material prepared in Preparative Example 2 was coated on one side of polyester fabric (210D yarn) having an average thickness of 120 占 퐉 in an average thickness of 27 占 퐉 by direct coating to prepare a fabric coated with a silver coating layer .

(2) Next, the silver coated fabric was laminated on both sides of a padding cotton (weight 5 oz) having an average thickness of 3 mm, and laminated so that the fabric and the padding were bonded to each other, that is, the silver coating layer- the first fabric layer- The second fabric layer and the silver coating layer were laminated in this order, and then each layer was bonded with a high frequency welding method (high frequency intensity 17,500 to 17,700 Hz) to prepare a protective sheet for preventing frost damage on the trees. FIG. 4 is a view showing this.

Example 5: Protective sheet for preventing frost damage on a tree containing a silver-coated fabric

A protective sheet for preventing tree frost damage was prepared in the same manner as in Example 3, except that the silver coating layer was formed to a thickness of 45 탆 to prepare a protective sheet for preventing frost damage.

Comparative Example 1: Protective sheet for preventing frost damage on a tree containing a moisture-permeable waterproof film

(100% polyester, weight 70 g / m ² ) having an average thickness of 120 탆 was used in place of the nonwoven fabric having a weight of 30 g / m ² The first nonwoven fabric layer and the second nonwoven fabric layer were formed using a nonwoven fabric (100% polyester having an average thickness of 120 탆 to prepare a protective sheet for preventing tree frost damage.

Comparative Example 2: Protective sheet for preventing frost damage on a tree containing a moisture-permeable waterproof film

A padding pad layer was formed using a padding cotton (weight 2 oz) having an average thickness of 3 mm instead of the padding cotton (weight 5 oz) having an average thickness of 3 mm to prepare a protective sheet for preventing frost damage.

Comparative Example 3: Protective sheet for preventing frost damage on a tree containing a silver-coated fabric

A protective sheet for preventing tree frost damage was prepared in the same manner as in Example 3, except that the silver coating layer was formed to a thickness of 60 탆 to prepare a protective sheet for preventing frost damage.

Experimental Example 1: Measurement of thermal resistance value of protective sheet

The thermal resistance values of the protective sheets prepared in Examples 1 to 4 were measured according to KS K ISO 11092: 1993, and the results are shown in Table 3 below.

division Thermal resistance value (m ² · K / W) Example 1 0.624 Example 2 0.674 Example 3 0.733 Example 4 0.762 Example 5 0.757 Comparative Example 1 0.425 Comparative Example 2 0.511 Comparative Example 3 0.760

The results of the tests of Table 3 indicate that the protective sheet for preventing frost damage to trees in Examples 1 to 4 has a thermal resistance value of 0.540 to 0.800 m ² · K / W, preferably 0.600 to 0.800 m ² · K / W And it was confirmed that it had a thermal resistance value. However, in the case of Comparative Example 1 and Comparative Example 2, as compared with Example 1, the thermal resistance value was significantly lowered.

In addition, in the case of Comparative Example 3, it was confirmed that although the thickness of the silver coating layer was increased by about 33% as compared with Example 5, there was almost no increase in the thermal resistance value as the thickness increased.

11: breathable waterproof film 12, 22: nonwoven fabric
13: padding cotton 21, 32: fabric
31: Silver coating

Claims (23)

A first nonwoven layer, a padding layer, a second nonwoven layer, a breathable waterproof film layer and a silver coating layer,
A silver coating layer, a first nonwoven fabric layer, a padded cotton layer, a second nonwoven fabric layer, and a moisture permeable waterproof film layer in this order; Or a first nonwoven fabric layer, a padding cotton layer, a second nonwoven fabric layer, a breathable waterproof film layer, and a silver coating layer are laminated in this order; Or a silver coating layer, a first nonwoven fabric layer, a padding cotton layer, a second nonwoven fabric layer, a breathable waterproof film layer and a silver coating layer are laminated in this order;
Wherein the silver coating layer is formed of a coating material containing 10 to 30 parts by weight of an organic solvent and 5 to 15 parts by weight of a silver pigment, based on 100 parts by weight of the polyurethane resin.
The protective sheet according to claim 1, wherein the first nonwoven fabric layer and the second nonwoven fabric layer have an average thickness of 100 to 140 탆, and the moisture permeable waterproof film layer has an average thickness of 200 to 240 탆.
delete A first nonwoven layer, a padding layer, a second nonwoven layer, a fabric layer and a silver coating layer,
A silver coating layer, a first nonwoven fabric layer, a padding soap layer, a second nonwoven fabric layer, and a fabric layer in this order; Or a silver coating layer, a first nonwoven layer, a padding layer, a second nonwoven layer, a fabric layer, and a silver coating layer are stacked in this order;
Wherein the silver coating layer is formed of a coating material containing 10 to 30 parts by weight of an organic solvent and 5 to 15 parts by weight of a silver pigment, based on 100 parts by weight of the polyurethane resin.
5. The protective sheet according to claim 4, wherein the first nonwoven fabric layer and the second nonwoven fabric layer have an average thickness of 100 to 140 占 퐉 and the fabric layer has an average thickness of 80 to 120 占 퐉.
delete 5. The absorbent article as claimed in claim 4, further comprising a breathable waterproof film layer,
Wherein the moisture permeable and waterproof film layer is formed between the fabric layer and the silver coating layer or between the second nonwoven fabric layer and the fabric layer.
5. The absorbent article as claimed in claim 4, further comprising a breathable waterproof film layer,
Wherein a silver coating layer, a first nonwoven fabric layer, a padding cotton layer, a second nonwoven fabric layer, a fabric layer, and a moisture permeable waterproof film layer are laminated in this order.
A fabric layer, a padding layer, a fabric layer and a silver coating layer,
A silver coating layer, a fabric layer, a padding layer and a fabric layer are laminated in this order; or
A fabric layer, a padded sole layer, a fabric layer and a silver coating layer are laminated in this order; or
A silver coating layer, a fabric layer, a padding layer, a fabric layer and a silver coating layer,
Wherein the silver coating layer is formed of a coating material containing 10 to 30 parts by weight of an organic solvent and 5 to 15 parts by weight of a silver pigment, based on 100 parts by weight of the polyurethane resin.
The protective sheet according to claim 9, wherein the fabric layer has an average thickness of 90 to 130 占 퐉.
delete 10. The absorbent article as set forth in claim 9, further comprising a breathable waterproof film layer,
Wherein the moisture permeable waterproof film layer is formed between the fabric layer and the silver coating layer.
10. The absorbent article as set forth in claim 9, further comprising a breathable waterproof film layer,
Wherein a silver coating layer, a fabric layer, a padding layer, a fabric layer, and a moisture permeable waterproof film layer are laminated in this order.
The protective sheet according to any one of claims 1, 4, and 9, wherein the silver coating layer has an average thickness of 20 to 50 占 퐉.
delete 10. The method of claim 1, 4 or 9, wherein the padded sole layer is made of a polyester material and comprises a padding cotton having a weight of 4 to 6 oz. Sheet.
The nonwoven fabric according to claim 1 or 4, wherein the first nonwoven fabric layer and the second nonwoven fabric layer are independently selected from polyester, nylon or polyester / nylon spunbond nonwoven fabric having a weight of 40 to 100 g / m ² Protective sheet for preventing frost damage.
10. The protective sheet for preventing frost damage on a tree according to claim 4 or 9, wherein the fabric layer is made of one kind of fabric selected from the group consisting of polyester, nylon or polyester / nylon fabric of Oxford fabric.
The breathable waterproof film layer according to any one of claims 1, 7, 8, 12, and 13, wherein the breathable waterproof film layer comprises 15 to 45 wt% of polyol, 20 to 40 wt% of diisocyanate, A polyurethane resin containing 5 to 15% by weight of a chain extender and 10 to 30% by weight of an organic solvent; Organic solvent; diluent; And a solubilizing agent.
The moisture-permeable waterproof film layer according to claim 19, wherein the moisture permeable waterproof film layer has a moisture permeability of 800 g / m ² / h to 2,000 g / m ² / h, a moisture permeability of JIS L-1092 as measured on the basis of water pressure method) Fig domestic 2,000 ㎜H ₂ O ~ 15,000 on the basis of the ㎜H ₂ O and JIS L-1096.6.27.2B (sputum type method) tree, characterized in that 5 seconds to 80 seconds, air permeability as measured Protective sheet for anti-theft.
10. A method according to any one of claims 1 to 9, characterized in that it has a thermal resistance value of 0.450 to 0.800 m &lt; ² &gt; · K / W as measured according to the method of KS K ISO 11092: 1993 Protective sheet for anti-theft.
A first step of sequentially laminating the first nonwoven fabric layer, the padded cotton layer and the second nonwoven fabric layer; And
The first nonwoven fabric layer, the second nonwoven fabric layer, the second nonwoven fabric layer, the fabric layer, and the silver coating layer are stacked in this order on the upper surface of the second nonwoven fabric layer, And a second step of bonding,
Wherein the silver coating layer is formed of a coating material comprising 10 to 30 parts by weight of an organic solvent and 5 to 15 parts by weight of a silver pigment based on 100 parts by weight of the polyurethane resin.
23. The method of claim 22, wherein the high-frequency welding of the two stages is performed by using a high-frequency wave of 15,000 to 20,000 Hz intensity so that the welding is performed so as to have a rhombic appearance such as a running stitch. Gt;

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