KR20210052351A - Waterproof polyurethane foam - Google Patents

Abstract

The present application relates to a polyurethane foam prepared from a composition comprising a polyol, a foam stabilizer, a catalyst and a gas for foaming. The waterproof polyurethane foam comprises: a high molecular polyether polyol having a molecular weight of 3000 to 5000, a number of functional groups of 2 to 4, and a hydroxyl group of 25 to 30 mgKOH/g; and a prepolymer obtained by reaction of a glycol-based ether polyol with an isocyanate, and having a molecular weight of 100 to 600, and a hydroxyl group of 200 to 400 mgKOH/g. The polyurethane foam of the present application has excellent waterproof and dustproof properties.

Description

Waterproof polyurethane foam {WATERPROOF POLYURETHANE FOAM}

The present application relates to a polyurethane foam, and more particularly, to a polyurethane foam that can be used to manufacture a polyurethane foam tape having excellent waterproof properties in electronic products, particularly mobile devices such as smartphones and tablets.

In various electronic devices such as mobile phones, hard disk drives (HDDs), televisions and liquid crystal displays, which are composed of precise mechanical parts and electronic devices, adhesive tapes including adhesives are applied to bond or laminate parts. The electronic devices easily break down or are damaged when physical shock is applied from the outside, and when pollutants such as dust are introduced from the outside, air flow in the electronic device is disturbed, causing overheating of the electronic device, and the lifespan is shortened. . In addition, when water penetrates into an electronic device, there is a problem that fatal damage to the internal circuit configuration is caused.

In order to solve these problems, in general, an electronic device is provided with a sheet that acts as a sealing capable of absorbing an external shock and blocking a gap in the exterior. One of them is to attach double-sided adhesive tape to one side of the silicone pad to attach it to an electronic device, or to use it by attaching it to a home appliance or electronic device after coating an acrylic adhesive on one side of the silicone pad. However, in the case of the silicon sheet, since the silicon itself, which is used as a raw material for the pad, has low surface tension and low waterproof and dustproof properties, a problem of damage to the device after attachment to the electronic device occurred.

And, in recent years, as electronic devices are gradually miniaturized and slimmed, the thickness of these adhesive tapes used therein is also becoming thinner accordingly. However, due to the decrease in the thickness of the shock absorbing pad, there is a problem that the shock absorbing ability of the sheet is deteriorated. In addition, there is a problem in that external foreign matter enters because the gap cannot be effectively blocked due to external shocks and vibrations from the side.

Therefore, when applied to an actual electronic device, it is required to have physical properties capable of maintaining a waterproof and dustproof function along with sufficient shock absorption.

Republic of Korea Patent Publication No. 10-1685835 (announcement on Dec. 12, 2016)

The polyurethane foam according to the present application was devised to solve the conventional problems as described above, and is a waterproof polyurethane that can be used for manufacturing a polyurethane foam tape having excellent waterproof properties in electronic products, especially mobile devices such as smartphones and tablets. I want to provide a form.

In the present application, in a polyurethane foam prepared from a composition comprising a polyol, a prepolymer, a foaming agent, a catalyst, and a foaming gas, the polyol has a molecular weight of 3000 to 5000, the number of functional groups is 2 to 4, and the hydroxyl value is 25 to A high molecular weight polyether polyol of 30 mgKOH/g; And a prepolymer obtained by reaction of a glycol-based ether polyol and an isocyanate, having a molecular weight of 100 to 600, and a hydroxyl value of 200 to 400 mgKOH/g. It is to provide a waterproof polyurethane foam that improves the waterproof and dustproof properties of mobile devices, including.

The present application is to provide a polyurethane foam that further includes a micro-hollow body to improve the waterproof and dustproof properties of mobile devices.

In order to solve the above-described problems, one embodiment of the present application is in a polyurethane foam prepared from a composition comprising a polyol, a foaming agent, a catalyst, and a foaming gas, wherein the polyol has a molecular weight of 3000 to 5000, A polymer polyether polyol having a number of functional groups of 2 to 4 and a hydroxyl value of 25 to 30 mgKOH/g; And a prepolymer obtained by reaction of a glycol-based ether polyol and an isocyanate, having a molecular weight of 100 to 600, and a hydroxyl value of 200 to 400 mgKOH/g. It provides a waterproof polyurethane foam comprising a.

In one embodiment of the present application, the polyol may further include a polyether polyol containing a chain extender having a molecular weight of 100 to 1000.

In one embodiment of the present application, a polyether polyol containing a bifunctional chain extender having a molecular weight of 100 to 600; Alternatively, a polyether polyol containing a trifunctional chain extender having a molecular weight of 500 to 1000 and a hydroxyl group of 150 to 300 mgKOH/g may be further included.

In one embodiment of the present application, the polyol may further include a lactone-based ester polyol.

In one embodiment of the present application, the lactone-based ester polyol may have a molecular weight of 100 to 600 and a hydroxyl value of 200 to 400 mgKOH/g.

In one embodiment of the present application, 30 to 70% by weight of a polymer polyether polyol; And 10 to 50% by weight of a prepolymer; 10 to 40% by weight of lactone-based ester polyol; 5 to 30% by weight of a polyether polyol containing a chain extender; may be included.

In one embodiment of the present application, the composition may include a micro-hollow body.

In one embodiment of the present application, the waterproof polyurethane foam may include bubbles having a ratio of a closed cell: an open cell of 9:1 to 5:5.

In one embodiment of the present application, a diameter of the closed cell may be 10 to 30 μm, and a diameter of the open cell may be 10 to 70 μm.

In one embodiment of the present application, the waterproof polyurethane foam, based on a density of 0.3g/cm ³ to 1 g/cm ³ , waterproofing is IP (International Protection) 8 grade or higher, and dustproofing is IP 6 grade or higher. I can.

In one embodiment of the present application, the waterproof polyurethane foam may have a 50% compressive load of 30 to 65 kgf.

One embodiment of the present application is a polyurethane foam tape including the polyurethane foam, and provides a waterproof polyurethane foam tape for mobile, characterized in that the thickness is 100 to 200㎛.

One embodiment of the present application provides a waterproof polyurethane foam pad including the polyurethane foam.

The polyurethane foam of the present application has the advantage of excellent waterproofing effect because the ratio of closed cells is high because bubbles are generated by using both the gas for fabrication and the micro-hollow body.

In addition, even though the thickness of the foam is 100 to 200 micrometers, there is an advantage in that the size of the inner cell is small and uniform, so that the dustproof effect is excellent.

The polyurethane foam of the present application generates air bubbles by using micro-hollow bodies including dry, non-expanded microspheres, so it generates cells of uniform structure and uniform size at low temperature without the need for water, and is dry and has a low density. Since it creates a cell, there is an advantage in that the light weight is enhanced.

Since the polyurethane foam of the present application further contains a polyether polyol containing a chain extender, it has a flexible structure in terms of a bonding structure and has an advantage of excellent impact resistance.

The waterproof polyurethane foam pad including the waterproof polyurethane foam of the present application has the advantage of excellent waterproof and dustproof.

Hereinafter, the present application will be described in more detail.

The following specific structure or functional descriptions are exemplified only to describe embodiments according to the concept of the present application, and embodiments according to the concept of the present application may be implemented in various forms and are based on the embodiments described herein. It should not be construed as limiting.

Since the embodiments according to the concept of the present application can be modified in various ways and have various forms, specific embodiments will be described in detail in the present specification. However, this is not intended to limit the embodiments according to the concept of the present application to a specific form of disclosure, it should be understood to include all changes, equivalents, or substitutes included in the spirit and scope of the present application.

The terms used in the present specification are only used to describe specific embodiments and are not intended to limit the present application. Singular expressions include plural expressions unless the context clearly indicates otherwise.

Unless otherwise defined, all terms including technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in the present specification. .

One embodiment herein provides a polyurethane foam.

At this time, the term "mechanical foaming" in the entire specification and in the claims means that the mixture of the foaming composition is stirred using a mechanical stirring device or the like so that bubbles or bubbles are generated inside the foaming composition. Specifically, it can be prepared through a process of mixing by supplying polyol, isocyanate, and nitrogen for coarse to a mixing header.

One example of the present application is in a polyurethane foam prepared from a composition comprising a polyol, a foaming agent, a catalyst, and a foaming gas, wherein the polyol has a molecular weight of 3000 to 5000, the number of functional groups is 2 to 4, and a hydroxyl group A polymer polyether polyol having 25 to 30 mgKOH/g; And a prepolymer obtained by reaction of a glycol-based ether polyol and an isocyanate, having a molecular weight of 100 to 600, and a hydroxyl value of 200 to 400 mgKOH/g. It provides a polyurethane foam comprising a.

Polyol is an initiator such as a multifunctional alcohol or aromatic amine having two or more hydroxyl groups (Hydroxyl Group, -OH) or amine group (Amine Group,-NH _{2) in the molecule and propylene oxide (PropyleneOxide, PO).} ) Or ethylene oxide (EO) is reacted under appropriate conditions, and is an essential raw material for polyurethane production along with isocyanate. Polyols are largely classified into polyether polyols and polyester polyols, and are used by varying the molecular weight of initiators and products to suit the intended use.

Polyether polyol was developed for the production of polyurethane foam, and is manufactured by adding propylene oxide (PO) or ethylene oxide (EO) to an initiator having two or more _{activated hydrogens (-OH, NH 2 ), and PPG (propyleneglycol), PTMEG.} Compared to (tetramethyleneglycol) and PEG (ethyleneglycol) polyester, it has the advantage of excellent hydrolysis resistance and low temperature characteristics. It is weak in oil solvents, it lacks thermal safety (exposure to long-term heat), the physical properties (abrasion resistance, etc.) of PPG are weak, and it is a flexible structure than ester type due to its bonding structure, so it is widely used in soft foam.

Polyester polyol can be prepared by dehydration and condensation reaction of dibasic acid (adipic acid) and glycol (Glycol) or triol. ), it can vary in various ways depending on the type and molecular weight of the polyol.

The polymer polyether polyol of the present application is ethylene oxide in polyhydric alcohols such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, neopentyl glycol, glycerin, pentaerythritol, trimethylolpropane, sorbitol, and sucrose. , Polyether polyols for polyurethane, such as polyether polyols to which alkylene oxides such as propylene oxide are added, can be used. More specifically, it may be a polyoxyalkylenepolyol obtained by ring opening polymerization of alkylene oxide, mainly propylene oxide, in polyhydric alcohol. Most of the base catalysts such as alkali metals are used, but because propylene oxide, a monomer, is isomerized in the process of synthesizing polyols, monoalcohols having one hydroxyl group at the end of the molecule may be produced by-products. have. The polyoxyalkylene polyol has the advantage of improving the reactivity of different physical properties by solving this problem.

In the present application, the term “prepolymer” refers to a polymer having a relatively low degree of polymerization, in which the polymerization reaction is stopped at an intermediate stage in order to facilitate molding. It is obtained by the reaction of glycol-based ether polyol and isocyanate, and the glycol-based ether polyol may be an ether polyol having a dipropylene glycol main chain.

The isocyanate (MDI: Methylene Diphenyl Diisocyanate) reacting with the glycol-based ether polyol may be aromatic, alicyclic, or aliphatic, and may be a bifunctional isocyanate having two isocyanate groups in one molecule, or 1 It may be a trifunctional or higher isocyanate having three or more isocyanate groups in the molecule. Moreover, these can also be used individually or in combination of multiple.

For example, as a bifunctional isocyanate, 2,4-tolylene diisocyanate (TDI), 2,6-tolylene diisocyanate (TDI), m-phenylene diisocyanate, p-phenylene diisocyanate, 4,4′-di Phenylmethane diisocyanate (MDI), 2,4'-diphenylmethane diisocyanate (MDI), 2,2'-diphenylmethane diisocyanate (MDI), xylene diisocyanate, 3,3'-dimethyl-4,4 Aromatic substances such as'-biphenylene diisocyanate, 3,3'-dimethoxy-4,4'-biphenylene diisocyanate, cyclohexane-1,4-diisocyanate, isophorone diisocyanate, dicyclohexylmethane -4,4'-diisocyanate, alicyclic things such as methylcyclohexane diisocyanate, butane-1,4-diisocyanate, hexamethylene diisocyanate, isopropylene diisocyanate, methylene diisocyanate, aliphatic type such as lysine isocyanate The thing of this can be mentioned.

In addition, isocyanate is not limited to one type, respectively, and may be 1 or more types. For example, one type of aliphatic isocyanate and two types of aromatic isocyanate can also be used in combination. The isocyanate index is preferably 100 or more and 110 or less. If the isocyanate index is out of this range, there is a problem that the compression residual distortion of the polyurethane foam becomes large. In addition, the isocyanate index is a value obtained by multiplying the number of moles of isocyanate groups per 1 mole of active hydrogen groups contained in the polyurethane raw material by 100 times.

On the other hand, the foaming agent is for stabilizing the cells of the foam, and nonionic surfactants such as polydimethylsiloxane or polyoxyalkylene are suitable. Can form a suitable cell structure within the polyurethane foam.

As the catalyst, an amine catalyst for polyurethane foam and a metal catalyst (organic metal compound catalyst) may be used alone or in combination. Examples of the amine catalyst include a monoamine compound, a diamine compound, a triamine compound, a polyamine compound, a cyclic amine compound, an alcohol amine compound, and an ether amine compound, and these may be one type or two or more types may be used in combination. . Examples of the metal catalyst include an organotin compound, an organic bismuth compound, an organolead compound, and an organozinc compound, and may be one of these or two or more.

As the gas for fabrication, a gas that does not adversely affect the reaction between polyol and isocyanate, for example, dry air or an inert gas such as nitrogen is suitable.

In addition, if necessary, a foaming aid or filler may be added to the polyurethane raw material. The foaming aid is added when lowering the apparent density of the polyurethane foam, and suitable foaming aids include water or purified water. The amount of the foaming aid added is preferably 0.4 parts by weight or more and 2.5 parts by weight or less per 100 parts by weight of the polyol. As a filler, a metal hydroxide, a colorant, an antistatic agent, etc. as a viscosity modifier of a polyurethane raw material are mentioned.

In one embodiment of the present application, the polyol may further include a polyether polyol containing a chain extender having a molecular weight of 100 to 1000.

In the present application, the term "chain extender" is a reactive single molecule used to strengthen polymerization or intermolecular bonds, and is a low molecular weight alcohol or amine having a bifunctional group and a 3, tetrafunctional group, while reacting with an isocyanate to form a urethane group. It is used to obtain a polymer having a large molecular weight by connecting chains and chains. Until the carbon number of the chain extender increases from 2 to 4, the Tg of the elastic body slightly increases, but when the number of carbons increases beyond that, the opposite tendency is observed.

One example of the present application is a polyether polyol containing a bifunctional chain extender having a molecular weight of 100 to 600; Alternatively, a polyether polyol containing a trifunctional chain extender having a molecular weight of 500 to 1000 and a hydroxyl group of 150 to 300 mgKOH/g may be further included.

Polyols have the greatest effect on optical properties such as the physical properties and refractive index of the polyurethane acrylate oligomer. If the chain extender of the synthesized polyurethane acrylate oligomer is branched, it disrupts the shape of the crystal, resulting in biostability and stability. It is most preferable to use a linear chain extender because it can reduce mechanical properties.

The amount of the chain extender to be used is 2 to 5% of the polyurethane, and the available bifunctional linear chain extender has a molecular weight of 60 to 450 and has a diol or diamine structure.

In particular, the diol chain extender may be a C1-12 alkanediol, a cyclic diol, or a silicone-containing diol. Most suitable examples are ethylene glycol, propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, 1,4-cyclohexanedimethanol, bisphenol. A, bisphenol F, reduced bisphenol A, reduced bisphenol F, dicyclopentadiol, tricyclodecanediol may be used, and the diamine chain extender may be hexamethylenediamine or m-phenylenediamine. .

In addition, the trifunctional chain extender has a triol structure, and one of glycerin and trimethylolpropane may be used.

The chain extender reacts with excess isocyanate to form allophanate and biuret structures to form a crosslinking agent. If necessary, a crosslinking agent may be added when synthesizing polyurethane. If the crosslinking agent is not mixed, it is preferable to add it because there is a disadvantage in that the heat resistance of the polyurethane foam decreases due to a crosslinking density.

In general, the crosslinking agent includes a low molecular weight compound having a number average molecular weight of 50 or more and 800 or less having 2 to 4 active hydrogen-containing groups capable of reacting with an isocyanate group. As a low molecular weight compound used as a crosslinking agent, for example, 1,4 butanediol (1.4-butanediol), triethylene glycol (TEG), tripropylene glycol (TPG), diethylene glycol (DEG), dipropylene glycol (DPG), etc. Can be used, but it is preferable to use DPG, which has excellent reactivity, is not affected by moisture, has low freezing point, and has good workability and can improve physical properties.

In one embodiment of the present application, the polyol may further include a lactone-based ester polyol.

In one embodiment of the present application, the lactone-based ester polyol may have a molecular weight of 100 to 600 and a hydroxyl value of 200 to 400 mgKOH/g.

Examples of the lactone-based ester polyol include a polyester polyol obtained by ring-opening addition polymerization of lactones using a short-chain polyol as an initiator. For example, it may be a lactone-based ester polyol such as caprolactone-based ester polyol, and examples of the cyclic lactone compound include ε-caprolactone, γ-butyrolactone, and δ-valerolactone, and these can be used alone. It can be used, or it can be used together.

One example of the present application, 30 to 70% by weight of a polymer polyether polyol; And 10 to 50% by weight of a prepolymer; 10 to 40% by weight of lactone-based ester polyol; 5 to 30% by weight of a polyether polyol containing a chain extender; may be included.

In one embodiment of the present application, the composition may include a micro-hollow body.

In the present application, the term “micro-hollow body” is a spherical polymer with fine particles having a diameter of about 0.01 to 100 μm. The outer shell of the micro-hollow body is made of at least one selected from the group consisting of Styrene-based elastomer, Olefin-based elastomer, Urethane-based elastomer, Amide-based elastomer, and Polyester elastomer depending on the material used. It is characterized by that. Preferably, any one or more of PMMA-based, PU-based, PS-based and AN-based resins may be selected and used, and more preferably, expanded polypropylene (EPP), expanded polystyrene (EPS), and expanded polyurethane (EPU, ETPU) ), an acrylonitrile-butadiene-styrene copolymer (ABS), a styrene-acrylonitrile copolymer (SAN), and a copolymer with styrene-methylmethacrylate. It is characterized by that. The micro-hollow body, organic beads such as general PMMA, PS, and silicon, and at least one selected from inorganic beads such as talc and calcium carbonate may be mixed and applied.

The micro-hollow body may be used in both spherical and amorphous form, and may be formed to contain gas inside so as to have an elastic force restored to external pressure. As described above, by containing a gas having an excellent recovery rate inside the outer shell containing the elastomer, it is possible to contribute to weight reduction of the product. Any gas can be used as the gas, but gas is preferable from the viewpoint of stability in consideration of explosion due to outflow. More specifically, the gas may be a hydrocarbon.

In one embodiment of the present application, the polyurethane foam may include bubbles having a ratio of a closed cell: an open cell of 9:1 to 5:5.

If the ratio of the closed cell to the open cell is 9:1 and the ratio of the closed cell exceeds 9, the ratio of the open cell is lowered, resulting in a decrease in the overall flexibility of the foam, resulting in weak impact resistance. Since the ratio of the open cells is higher, there may be a problem in generating a uniform cell structure and a cell having a uniform size, and there is a problem in that light weight may be weakened because it is difficult to generate a cell having a low density.

In one embodiment of the present application, the diameter of the closed cell may be 10 to 30 μm, and the diameter of the open cell may be 10 to 70 μm.

The formation of the cell can be formed by injection of micro-hollow bodies and mechanical foaming.

Cells formed by injecting micro-hollow bodies form only closed cells. In addition, the cell formed using mechanical foaming is a method of foaming while heating by injecting nitrogen, and may be formed alone or in combination of a closed cell and an open cell (expanding bead type).

At this time, the diameter of the cell may vary, and may be manufactured in the range of 10 to 70 μm. If the diameter of the cell is less than 10 μm, the cushioning function is lowered and the impact resistance is lowered, and if the diameter of the cell is more than 70 μm, the size is too large, and there is a high risk of damage due to the bead being pressed and crushed by the load.

More specifically, if the diameter of the closed cell is less than 10 μm, the cushioning function decreases, resulting in lower impact resistance, and if the diameter of the cell exceeds 30 μm, the cell is too large to break, resulting in a problem that the ratio of open cells increases. have. In addition, when the diameter of the open cell is less than 10 μm, the cushioning function is lowered, and the impact resistance is lowered, and when the diameter of the cell is more than 70 μm, the compressive stress decreases, so that the bead is easily pressed and crushed by the load, which is highly likely to be damaged. In addition, when the compressive stress is reduced, the shear strength of the foam is weakened, so that residual compression distortion is easily generated due to the compressive load, and the vibration resistance of the foam is weakened.

All colors can be implemented, but the cell used in the tape of the present invention is preferably black or white for shading or processing.

In one embodiment of the present application, the polyurethane foam may have a density of 0.3g/cm ³ to 1 g/cm ³ , waterproofness of IP (International Protection) 8 grade or higher, and dustproofness of IP 6 grade or higher. have.

In one embodiment of the present application, the polyurethane foam may have a 50% compressive load of 30 to 65 kgf.

The 50% compressive load is an index indicating the ease of compression in the thickness direction, and the smaller it is, the easier compression can be in the thickness direction. If the 50% compressive load is within the above range, there is an advantage that the polyurethane foam is easily compressed in the thickness direction and thus has excellent impact resistance. If the compressive load is less than 30kgf, the compressive stress is greater than the compressive load and cannot provide a cushioning function, and if the compressive load exceeds 65kgf, the compressive stress is smaller than the compressive load and compresses with excessive compression than 50% compressive load. There is a problem that the foam is damaged due to residual distortion.

One embodiment of the present application is a polyurethane foam tape including the polyurethane foam, and a polyurethane foam tape for mobile having a thickness of 100 to 200 μm.

The polyurethane foam tape can provide a cushion tape having a very improved shock absorption and restoring power than a conventional stretchable tape by imparting a cushion function to the stretchable adhesive tape using a micro-hollow body. In addition, by using a micro-hollow body, it is a cushion tape that can absorb vibrations or shocks not only in a plane but also in a vertical direction, and realize excellent shock absorption and stretchable adhesive functions at the same time. It can have an effect capable of sufficiently satisfying the demand for miniaturization and weight reduction.

In addition, if a micro-hollow body is applied to the adhesive tape to give elasticity, the particle size can be selected according to the layer thickness of the adhesive tape, and there is a characteristic of deformation and restoration against self-pressing. This is improved, and there is an advantage in that the adhesive material is easily adhered to the surface to be attached in a plane so that it is possible to maintain adhesive force and elasticity. That is, if the micro-hollow body is used to impart impact resistance and elasticity, it is possible to solve the limitations of the conventional adhesive tape layer thickness and appearance problems.

One embodiment of the present application provides a waterproof polyurethane foam pad including the polyurethane foam.

The waterproof polyurethane foam pad may be applied to electronic products, particularly micro-mobile devices such as smartphones and tablets, and the scope of the present application is not limited thereto.

The waterproof polyurethane foam pad has the advantage of excellent waterproof and dustproof properties.

Table 1 shows the weights of components included in Examples 1 to 4 and Comparative Examples 1 to 5 prepared to evaluate the physical properties of the polyurethane foam according to the present invention manufactured by the above-described method.

Component conditions commonly applied to Examples 1 to 4 and Comparative Examples 1 to 5 are as follows.

<Constituent conditions commonly applied to each Example and Comparative Example>

-Crosslinking agent: Dipropylene glycol was used, and added in a proportion of 3 parts by weight.

-Foaming agent: Polydimethylsiloxane was used, and added in a ratio of 2 parts by weight based on 100 parts by weight of polyol.

-Carbon-based pigment: added in a proportion of 6 parts by weight based on 100 parts by weight of polyol.

[Example 1]

The polyurethane foam composition according to the common conditions includes 100 parts by weight of a polyol consisting of 50 parts by weight of a polymer polyether polyol, 30 parts by weight of a prepolymer, and 17 parts by weight of a polyether polyol containing a triol chain extender, and additionally amines It contains 0.3 parts by weight of the catalyst and 0.2 parts by weight of the micro-hollow body, nitrogen is used as the gas for forming, the mixing ratio of the polyurethane raw material is 60%, and the coating thickness of the gas-liquid mixture applied by the ejector is 150 μm. The foam was prepared.

[Example 2]

Polyurethane foam composition according to common conditions is a polyol consisting of 55 parts by weight of a polymer polyether polyol, 20 parts by weight of a lactone ester polyol, 10 parts by weight of a prepolymer, and 12 parts by weight of a polyether polyol containing a triol chain extender. 100 parts by weight, additionally, 0.35 parts by weight of the amine catalyst and 0.3 parts by weight of the micro-hollow body, nitrogen is used as the gas for forming, and the mixing ratio of the polyurethane raw material is 60%, and the gas liquid applied by the ejector A polyurethane foam was prepared with a coating thickness of 150 μm of the mixture.

[Example 3]

Polyurethane foam composition according to common conditions is a polyol 100 consisting of 50 parts by weight of a polymer polyether polyol, 30 parts by weight of a lactone ester polyol, 30 parts by weight of a prepolymer, and 17 parts by weight of a polyether polyol containing a diol chain extender. Includes parts by weight, and additionally contains 0.35 parts by weight of the amine-based catalyst and 0.3 parts by weight of the micro-hollow body, nitrogen is used as the gas for forming, and the mixing ratio of the polyurethane raw material is 60%, and the gas-liquid mixture applied by the ejector A polyurethane foam was prepared with a coating thickness of 150 μm.

[Example 4]

Polyurethane foam composition according to common conditions is a polyol 100 consisting of 55 parts by weight of a polymer polyether polyol, 20 parts by weight of a lactone ester polyol, 10 parts by weight of a prepolymer, and 12 parts by weight of a polyether polyol containing a diol chain extender. Includes parts by weight, and additionally contains 0.35 parts by weight of the amine-based catalyst and 0.3 parts by weight of the micro-hollow body, nitrogen is used as the gas for forming, and the mixing ratio of the polyurethane raw material is 60%, and the gas-liquid mixture applied by the ejector A polyurethane foam was prepared with a coating thickness of 150 μm.

[Comparative Example 1]

Polyurethane foam according to common conditions contains 100 parts by weight of a polyol consisting of 50 parts by weight of a polymer polyether polyol, 33 parts by weight of a lactone-based ester polyol, and 14 parts by weight of a polyether polyol containing a diol chain extender. 0.3 parts by weight of amine catalyst, 1.5 parts by weight of metal catalyst, and 0.4 parts by weight of micro-hollow body, nitrogen is used as the gas for forming, the mixing ratio of the polyurethane raw material is 60%, and the gas-liquid mixture applied by the ejector A polyurethane foam was prepared with a coating thickness of 150 μm.

[Comparative Example 2]

Polyurethane foam according to common conditions includes 100 parts by weight of a polyol consisting of 50 parts by weight of a polymer polyether polyol, 35 parts by weight of a lactone-based ester polyol, and 12 parts by weight of a polyether polyol containing a diol chain extender. The amine catalyst contains 0.3 parts by weight, the metal catalyst contains 1.5 parts by weight, and the micro-hollow material contains 0.4 parts by weight, the gas for forming is nitrogen, the mixing ratio of the polyurethane raw material is 60%, and the gas liquid applied by the ejector A polyurethane foam was prepared with a coating thickness of 150 μm of the mixture.

[Comparative Example 3]

Polyurethane foam according to common conditions includes 100 parts by weight of a polyol consisting of 50 parts by weight of a polymer polyether polyol, 37 parts by weight of a lactone-based ester polyol, and 10 parts by weight of a polyether polyol containing a diol chain extender. The amine catalyst contains 0.3 parts by weight, the metal catalyst contains 1.5 parts by weight, and the micro-hollow body contains 0.1 parts by weight, the gas for forming is nitrogen, the mixing ratio of the polyurethane raw material is 60%, and the gas liquid applied by the ejector A polyurethane foam was prepared with a coating thickness of 150 μm of the mixture.

[Comparative Example 4]

Polyurethane foam according to common conditions includes 100 parts by weight of a polyol consisting of 50 parts by weight of a polymer polyether polyol, 37 parts by weight of a lactone-based ester polyol, and 10 parts by weight of a polyether polyol containing a diol chain extender. The amine catalyst contains 0.3 parts by weight, the metal catalyst contains 1.5 parts by weight, and the micro-hollow material contains 0.4 parts by weight, the gas for forming is nitrogen, the mixing ratio of the polyurethane raw material is 60%, and the gas liquid applied by the ejector A polyurethane foam was prepared with a coating thickness of 150 μm of the mixture.

[Comparative Example 5]

Polyurethane foam according to common conditions includes 100 parts by weight of a polyol consisting of 50 parts by weight of a polymer polyether polyol, 39 parts by weight of a lactone-based ester polyol, and 8 parts by weight of a polyether polyol containing a diol chain extender. The amine catalyst contains 0.3 parts by weight, the metal catalyst contains 1.5 parts by weight, and the micro-hollow material contains 0.4 parts by weight, the gas for forming is nitrogen, the mixing ratio of the polyurethane raw material is 60%, and the gas liquid applied by the ejector A polyurethane foam was prepared with a coating thickness of 150 μm of the mixture.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 KE510
(Polymer polyether polyol) 50 55 50 55 50 50 50 50 50 CAPA2043
(Lactone ester polyol) 20 20 33 35 37 37 39 J400 (prepolymer) 30 10 30 10 PP 400 (diol polyether polyol) 17 12 14 12 10 10 8 TF 700 (triol-based polyether polyol) 17 12 DPG (crosslinking agent) 3 3 3 3 3 3 3 3 3 Sum 100 100 100 100 100 100 100 100 100 Amin Cat. 0.3 0.35 0.35 0.35 0.3 0.3 0.3 0.3 0.3 Metal Cat. 1.5 1.5 1.5 1.5 1.5 Antifoam 2 2 2 2 2 2 2 2 2 Pigment 6 6 6 6 6 6 6 6 6 EX092 (micro hollow body) 0.2 0.3 0.3 0.3 0.4 0.4 0.1 0.4 0.4

[Experimental Example 1] Measurement of physical properties

Density, waterproof, dustproof, and shear strength tests of the polyurethane foams of Examples 1 to 4 and Comparative Examples 1 to 5 were performed, and the results are shown in Table 2 below.

The waterproofing experiment was conducted on the basis of whether or not the polyurethane foam passed the waterproofing IP 8 or higher when left in water for 72 hours, and the dustproofing experiment was conducted on the basis of whether or not passed the dustproofing IP 6 or higher.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 density 0.7 0.5 0.6 0.5 0.4 0.3 0.5 0.5 0.4 Waterproof
72h left O O O O X X O O X square O O O O X X X X X Shear strength 61.5 42.8 46.5 30.9 15.6 17.4 26.1 28.6 29.4

As shown in Table 2, the polyurethane foams according to Examples 1 to 4 of the present invention are waterproof grade IP (International Protection) 8 or higher and dustproof grade IP (International Protection) 6 or higher according to IEC 529, an international standard. You can see that you are satisfied. In Comparative Examples 1 to 5, there is a problem in that the prepolymer is not added, so that the shear strength of the foam is weakened, and thus the dustproof effect is inferior.

Specifically, in the case of Examples 1 to 4 according ^{to the present invention, it is found to have physical properties of 150 μm in thickness and 0.5 to 0.7 g/cm 3} in density, and the polyurethane foam according to the present invention is significantly thinner when compared to the prior art. It can be seen that it has physical properties that can provide sufficient waterproof and dustproof functions while having a thickness, and has excellent durability even in shear strength. Particularly, in Examples 1 and 2, in the shear strength test, excellent physical properties were confirmed, and as a result, it was found that the triol-based polyether polyol has better strength than the diol-based polyether polyol.

On the other hand, in Comparative Examples 1 to 4 according to the prior art, it was found that the waterproof rating could not satisfy the standard value because the density was low. It can be seen that the physical properties are very weak.

As described above, a specific part of the present application has been described in detail, and it is clear that this specific technology is only a preferred embodiment for those of ordinary skill in the art, and the scope of the present application is not limited thereto.

Accordingly, it will be said that the substantial scope of the present application is defined by the appended claims and their equivalents.

Claims (13)

In the waterproof polyurethane foam produced from a composition comprising a polyol, a foaming agent, a catalyst, and a foaming gas,
The polyol,
A high molecular weight polyether polyol having a molecular weight of 3000 to 5000, a functional group number of 2 to 4, and a hydroxyl value of 25 to 30 mgKOH/g; And
A prepolymer obtained by reaction of a glycol-based ether polyol and an isocyanate, a molecular weight of 100 to 600, and a hydroxyl value of 200 to 400 mgKOH/g;
Waterproof polyurethane foam comprising a.
The method according to claim 1,
The polyol is a waterproof polyurethane foam further comprising a polyether polyol containing a chain extender having a molecular weight of 100 to 1000.
The method according to claim 2,
Polyether polyol containing a bifunctional chain extender having a molecular weight of 100 to 600; or
Waterproof polyurethane foam, characterized in that it further comprises a polyether polyol containing a trifunctional chain extender having a molecular weight of 500 to 1000 hydroxyl groups of 150 to 300mgKOH / g.
The method according to claim 2,
The polyol,
Waterproof polyurethane foam, characterized in that it further comprises a lactone-based ester polyol.
The method of claim 4,
The lactone-based ester polyol,
Waterproof polyurethane foam, characterized in that the molecular weight is 100 to 600, and a hydroxyl value of 200 to 400 mgKOH / g.
The method of claim 4,
30 to 70% by weight of a polymer polyether polyol;
10 to 50% by weight of prepolymer;
10 to 40% by weight of lactone-based ester polyol; And
5 to 30% by weight of a polyether polyol containing a chain extender; waterproof polyurethane foam comprising a.
The method according to claim 1,
The composition is a waterproof polyurethane foam, characterized in that it comprises a micro-hollow body.
The method according to claim 1,
The polyurethane foam,
Closed cell (closed cell): a waterproof polyurethane foam, characterized in that the open cell (open cell) ratio of 9:1 to 5:5 comprising air bubbles,
The method of claim 8,
The closed cell has a diameter of 10 to 30 μm,
Waterproof polyurethane foam, characterized in that the diameter of the open cell (open cell) is 10 to 70㎛.
The method according to claim 1,
The polyurethane foam,
Based on a density of 0.3g/cm ³ to 1 g/cm ³ ,
Waterproof is IP(International Protection) 8 or higher,
Waterproof polyurethane foam, characterized in that it has a dustproof property of IP 6 or higher.
The method according to claim 1,
The polyurethane foam,
Waterproof polyurethane foam, characterized in that the 50% compressive load is 30 to 65 kgf.
It is a polyurethane foam tape comprising the polyurethane foam of any one of claims 1 to 11,
Waterproof polyurethane foam tape for mobile, characterized in that the thickness is 100 to 200㎛.
Waterproof polyurethane foam pad comprising the polyurethane foam of any one of claims 1 to 11.