KR102556255B1 - Waterproof polyurethane foam - Google Patents

Abstract

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

Description

Waterproof polyurethane foam {WATERPROOF POLYURETHANE FOAM}

This application relates to 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 composed of precise mechanical parts and electronic elements, adhesive tapes containing adhesives are applied for bonding or stacking of parts. The electronic devices are easily broken or damaged when a physical shock is applied from the outside, and when contaminants such as dust are introduced from the outside, the air flow in the electronic device is disturbed, causing overheating of the electronic device and shortening its lifespan. . In addition, when water penetrates into the electronic device, there is a problem in that the internal circuit configuration is fatally damaged.

In order to solve these problems, in general, an electronic device is provided with a sheet that serves as a seal to absorb impact from the outside and to block gaps in the exterior. One of them is to attach a double-sided adhesive tape to one side of the silicone pad to attach it to an electronic device, or to apply an acrylic adhesive to one side of the silicone pad and then attach it to a home appliance or electronic device. However, in the case of a silicon sheet, since silicon itself used as a raw material for a pad has low surface tension and low waterproof and dustproof properties, damage to the device after being attached to the electronic device has occurred.

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

Therefore, when applied to actual electronic devices, it is required to have physical properties capable of maintaining waterproof and dustproof functions together with sufficient shock absorption.

Republic of Korea Patent Registration No. 10-1685835 (2016.12.12. Notice)

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

The present application is a polyurethane foam prepared from a composition including a polyol, a prepolymer, a foam stabilizer, a catalyst, and a foam stabilizer gas, wherein the polyol has a number average molecular weight of 3000 to 5000, a number of functional groups of 2 to 4, and a hydroxyl value. 25 to 30 mgKOH/g high-molecular polyether polyol; and a prepolymer obtained by reacting glycol-based ether polyol with isocyanate, having a number average molecular weight of 100 to 600, and a hydroxyl group of 200 to 400 mgKOH/g; 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 improves waterproof and dustproof properties of a mobile device by further including microscopic hollow bodies.

In order to solve the above problems, one embodiment of the present application is a polyurethane foam prepared from a composition including a polyol, a prepolymer, a foam stabilizer, a catalyst, and a gas for foam control, wherein the polyol has a number average molecular weight of 3000 to 5000, the number of functional groups is 2 to 4, and the hydroxyl group is 25 to 30 mgKOH/g, and the prepolymer is obtained by reacting a glycol-based ether polyol with isocyanate, and has a number average molecular weight of 100 to 600, and provides a waterproof polyurethane foam characterized in that the hydroxyl group is 200 to 400 mgKOH/g.

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

Polyether polyol having a number average molecular weight of 100 to 600 in one embodiment of the present application; Alternatively, a polyether polyol having a number average 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 number average molecular weight of 100 to 600 and a hydroxyl group of 200 to 400 mgKOH/g.

In one embodiment of the present application, 30 to 70% by weight of high molecular weight polyether polyol; and 10 to 50% by weight of a prepolymer; 10 to 40% by weight of a lactone-based ester polyol; 5 to 30% by weight of a polyether polyol having a number average molecular weight of 100 to 1000;

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 cells having a ratio of closed cells to open cells of 9:1 to 5:5.

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.

In one embodiment of the present application, the waterproof polyurethane foam has a density of 0.3 g/cm ³ to 1 g/cm ³ , waterproofness is IP (International Protection) 8 grade or higher, and dustproofness is IP 6 grade or higher. 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 containing 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 an advantage in that it has an excellent waterproof effect due to a high ratio of closed cells since bubbles are generated using both the foaming gas and the microscopic hollow bodies.

In addition, even though the thickness of the foam is 100 to 200 micrometers, the size of the internal cells is small and uniform, so there is an advantage in that the anti-vibration effect is excellent.

The polyurethane foam of the present application generates air bubbles using microscopic hollow bodies including dry, unexpanded microspheres, so that cells with a uniform structure and uniform size are created at low temperatures without the need for water, and dry and low-density Since it creates a cell, it has the advantage of being lightweight.

The polyurethane foam of the present application has an advantage in that it has a flexible structure in terms of a coupling structure and has excellent impact resistance.

The waterproof polyurethane foam pad comprising the waterproof polyurethane foam of the present application has the advantage of being excellent in waterproof and dustproof.

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

The following specific structural or functional descriptions are merely exemplified to explain 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 the embodiments described herein should not be construed as limiting.

Embodiments according to the concept of the present application may be applied with various changes and may have various forms, so specific embodiments will be described in detail herein. However, this is not intended to limit the embodiments according to the concept of the present application to a specific disclosure form, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present application.

Terms used in this 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 dictates otherwise.

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

One embodiment of the present specification provides a polyurethane foam.

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

One embodiment of the present application is a polyurethane foam prepared from a composition including a polyol, a prepolymer, a foam stabilizer, a catalyst, and a foam control gas, wherein the polyol has a number average molecular weight of 3000 to 5000 and a number of functional groups of 2 to 5000. 4, a polymeric polyether polyol having a hydroxyl group of 25 to 30 mgKOH/g; and a prepolymer obtained by reacting glycol-based ether polyol with isocyanate, having a number average molecular weight of 100 to 600, and a hydroxyl group of 200 to 400 mgKOH/g; Provides a polyurethane foam comprising a.

A polyol is a multifunctional alcohol having two or more hydroxyl groups (-OH) or amine groups (-NH ₂ ) in its molecule or an initiator such as an aromatic amine and propylene oxide (PO). ) or ethylene oxide (EO) as a material obtained by reacting under appropriate conditions, and is an essential raw material for producing polyurethane together with isocyanate. Polyols are largely classified into polyether polyols and polyester polyols, and are used by changing the molecular weight of initiators and products suitable for their intended use.

Polyether polyol was developed for the production of polyurethane foam, and is prepared by adding propylene oxide (PO) or ethylene oxide (EO) to an initiator having two or more active hydrogens (-OH, NH ₂ ), PPG (propylene glycol), PTMEG Compared to (tetramethylene glycol) and PEG (ethylene glycol) polyester, it has excellent hydrolysis resistance and low-temperature characteristics. It is weak to oil solvents, lacks thermal stability (exposure to heat for a long time), has poor physical properties (abrasion resistance, etc.) of PPG, and is more flexible than ester type in terms of bonding structure, so it is widely used in soft foam.

Polyester polyol can be produced by a dehydration condensation reaction between dibasic acid (adipic acid) and glycol or triol, and the properties and physical properties of the obtained polyester polyol depend on the acid used. ), it can be variously changed 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 polyol for polyurethane, such as polyether polyol to which alkylene oxide, such as a propylene oxide, was added can be used. More specifically, it may be polyoxyalkylenepolyol obtained by ring opening polymerization of polyhydric alcohol with alkyleneoxide, mainly propyleneoxide. Base catalysts such as alkali metals are used in most cases, but propylene oxide, a monomer, is isomerized in the process of synthesizing polyol, so monoalcohol having one hydroxyl group at the end of the molecule may be produced as a by-product. there is. The polyoxyalkylene polyol has the advantage of improving the reactivity of different physical properties by solving these problems.

In this 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. Obtained by the reaction of glycol-based ether polyol and isocyanate, the glycol-based ether polyol may be an ether polyol having a dipropylene glycol main chain.

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

For example, as 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 Aromatics such as '-biphenylene diisocyanate, 3,3'-dimethoxy-4,4'-biphenylene diisocyanate, cyclohexane-1,4-diisocyanate, isophorone diisocyanate, dicyclohexylmethane Alicyclics such as -4,4'-diisocyanate and methylcyclohexane diisocyanate, butane-1,4-diisocyanate, hexamethylene diisocyanate, isopropylene diisocyanate, methylene diisocyanate and lysine isocyanate of can be heard.

In addition, isocyanate is not limited to 1 type, respectively, 1 or more types may be sufficient as it. For example, one type of aliphatic isocyanate and two types of aromatic isocyanate may be used together. The isocyanate index is preferably 100 or more and 110 or less. When the isocyanate index is out of this range, there is a problem in that compression residual strain of the polyurethane foam increases. 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.

On the other hand, the foam control 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 inside the polyurethane foam.

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

As the gas for packing, 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, foaming aids or fillers may be added to the polyurethane raw material as needed. The foaming aid is added when the apparent density of polyurethane foam is lowered, and suitable foaming aids include water or purified water. The addition amount of the foaming aid is preferably 0.4 parts by weight or more and 2.5 parts by weight or less per 100 parts by weight of polyol. Examples of the filler include metal hydroxides as viscosity modifiers for polyurethane raw materials, colorants, and antistatic agents.

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

In this application, the term “chain extender” is a reactive single molecule used for polymerization or to strengthen intermolecular bonds, and is a low molecular weight alcohol or amine having a bifunctional group and a trifunctional or tetrafunctional group, which reacts with isocyanate to form a urethane group. It is used to obtain polymers with high molecular weight by chain-to-chain linkages. Until the number of carbon atoms in the chain extender increases from 2 to 4, the Tg of the elastomer increases slightly, but when the number of carbon atoms increases beyond that, it tends to decrease.

One embodiment of the present application is a polyether polyol having a number average molecular weight of 100 to 600; Alternatively, a polyether polyol having a number average molecular weight of 500 to 1000 and a hydroxyl group of 150 to 300 mgKOH/g may be further included.

Polyol has the greatest influence on the physical properties of polyurethane acrylate oligomer and optical properties such as refractive index. A linear chain extender is most preferred because it can lower mechanical properties.

The amount of the chain extender is appropriately 2 to 5% based on polyurethane, and the usable bifunctional linear chain extender has a number average 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 silicon-containing diol. The 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 One of A, bisphenol F, reduced bisphenol A, reduced bisphenol F, dicyclopentadiol, and tricyclodecanediol can be used, and as the diamine chain extender, one of hexamethylenediamine and m-phenylenediamine can be used. .

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 an allophanate and biuret structure to form a crosslinking agent. If necessary, a crosslinking agent may be further added during polyurethane synthesis. 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 is lowered due to the crosslinking density.

Generally, the crosslinking agent includes a low molecular weight compound having a number average molecular weight of 50 or more and 800 or less, which has 2 to 4 active hydrogen-containing groups capable of reacting with isocyanate groups. As a low molecular weight compound used as a crosslinking agent, 1, 4 butanediol (1.4-butanediol), triethylene glycol (TEG), tripropylene glycol (TPG), diethylene glycol (DEG), dipropylene glycol (DPG) etc., for example. can be used, but it is preferable to use DPG, which has excellent reactivity, is not affected by moisture, has a low freezing point, and has good workability to 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 number average molecular weight of 100 to 600 and a hydroxyl group of 200 to 400 mgKOH/g.

Examples of the lactone ester polyol include polyester polyols 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. may or may not be used together.

One embodiment of the present application, 30 to 70% by weight of high molecular weight polyether polyol; and 10 to 50% by weight of a prepolymer; 10 to 40% by weight of a lactone-based ester polyol; 5 to 30% by weight of a polyether polyol having a number average molecular weight of 100 to 1000;

In one embodiment of the present application, the composition may include micro hollow bodies.

In this application, the term "micro hollow body" is a spherical polymer with fine particles having a diameter of about 0.01 to 100 μm. The shell of the hollow microbody 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. characterized by 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), expanded polyurethane (EPU, ETPU) ), acrylonitrile-butadiene-styrene copolymer (ABS), styrene-acrylonitrile copolymer (SAN), styrene-made of at least one or more characterized in that selected from a copolymer with methyl methacrylate characterized by It can be mixed and applied, including the micro-hollow body and at least one selected from organic beads such as general PMMA, PS, Silicon, and inorganic beads such as talc and calcium carbonate.

The hollow microbody may be used in both a spherical shape and an amorphous shape, and may be formed to contain gas therein so as to have an elastic force that is restored to an external pressure. As described above, by containing a gas having an excellent recovery rate inside the outer shell including the elastomer, it is possible to contribute to weight reduction of the product. Any gas may be used, but gas is preferable in terms of stability in consideration of explosion due to leakage. More specifically, the gas may be a hydrocarbon.

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

In the closed cell to open cell ratio of 9:1, if the ratio of closed cells exceeds 9, the ratio of open cells is lowered and the flexibility of the overall foam is lowered, which may weaken impact resistance. If the ratio of closed cells is lower than 5 Since the ratio of open cells is higher, there may be problems in generating uniform cell structures and cells of uniform size, and it is difficult to create cells with a low density, and lightness may be weakened.

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.

Formation of the cells may 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 uses a method of foaming while heating by injecting nitrogen, and may be formed individually or in combination with a closed cell and an expanding bead type.

At this time, the diameter of the cell may vary, and may be manufactured from 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, so there is a high risk of damage due to the bead being crushed and crushed by the load.

More specifically, if the diameter of the closed 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 30 μm, the size is too large and the cell is broken, resulting in a large percentage of open cells. there is. In addition, when the diameter of the open cell is less than 10 μm, the cushion function is lowered and the impact resistance is lowered, and when the diameter of the cell is greater than 70 μm, the compressive stress is reduced, so that the bead is easily pressed and crushed by a load, so there is a high risk of damage. In addition, when the compressive stress is reduced, the shear strength of the foam is weakened, so compression residual distortion easily occurs due to the compressive load, and there is a problem in that the vibration isolation 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 light blocking or processing.

In one embodiment of the present application, the polyurethane foam, based on the density of 0.3g / cm ³ to 1 g / cm ³ , IP (International Protection) grade 8 or more, dustproof may be IP 6 grade or more there is.

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

The 50% compression load is an index indicating the ease of compression in the thickness direction, and the smaller it is, the easier it is to compress in the thickness direction. When the 50% compression load is within the above range, the polyurethane foam is easily compressed in the thickness direction and has excellent impact resistance. If the compressive load is less than 30 kgf, the compressive stress is greater than the compressive load, so a cushion function cannot be provided, and if the compressive load exceeds 65 kgf, the compressive stress is smaller than the compressive load, resulting in excessive compression than the 50% compressive load. There is a problem that residual distortion occurs and the foam is damaged.

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 with greatly improved shock absorption and restoring force compared to conventional stretchable tapes by imparting a cushion function to an extensible adhesive tape using a micro-hollow body. In addition, by using a micro-hollow body, vibration or shock can be absorbed not only on a flat surface but also in the vertical direction, and as a cushion tape that can simultaneously realize excellent shock absorption and stretchable adhesive function, it is used in electronic products. It can have an effect that can sufficiently satisfy the demand for compactness and light weight.

In addition, when micro-hollow bodies are applied to the adhesive tape to give elasticity, it is possible to select the particle size according to the thickness of the layer of the adhesive tape, and it has deformation and restoration characteristics for its own pressing, so the appearance protrudes during decompression for attachment. This is improved, and the adhesive material is easily adhered to the surface to be attached in a plane, so that adhesive force and elasticity can be maintained. That is, when impact resistance and elasticity are imparted by using micro-hollow bodies, the limitations of the conventional adhesive tape layer thickness and external problems can be solved.

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

The waterproof polyurethane foam pad can be applied to electronic products, in particular, micro-mobile devices such as smart phones and tablets, but the scope of the present application is not limited thereto.

The waterproof polyurethane foam pad has an advantage in that it has excellent waterproof and dustproof properties.

Table 1 shows the weights of the 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 method.

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

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

- Crosslinking agent: Dipropylene glycol was used and added at a rate of 3 parts by weight.

- Foam stabilizer: Polydimethylsiloxane was used, and it was added at a rate of 2 parts by weight based on 100 parts by weight of polyol.

- Carbon-based pigment: Added at a rate of 6 parts by weight based on 100 parts by weight of polyol.

[Example 1]

The polyurethane foam composition according to common conditions includes 100 parts by weight of a polyol composed of 50 parts by weight of a polymeric polyether polyol, 30 parts by weight of a prepolymer, and 17 parts by weight of a triol-based polyether polyol, and further includes 0.3 parts by weight of an amine-based catalyst and Polyurethane foam was prepared by including 0.2 parts by weight of the hollow microbody, using nitrogen as a gas for foaming, a mixing ratio of polyurethane raw materials of 60%, and a coating thickness of the gas-liquid mixture applied by the ejector of 150 μm.

[Example 2]

The polyurethane foam composition according to common conditions includes 100 parts by weight of a polyol composed of 55 parts by weight of polymeric polyether polyol, 20 parts by weight of lactone-based ester polyol, 10 parts by weight of prepolymer, and 12 parts by weight of triol-based polyether polyol, In addition, 0.35 parts by weight of the amine-based catalyst and 0.3 parts by weight of the micro hollow body are included, nitrogen is used as the gas for formulation, 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 Polyurethane foam was prepared in μm.

[Example 3]

The polyurethane foam composition according to common conditions includes 100 parts by weight of a polyol composed of 50 parts by weight of a polymeric 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 diol-based polyether polyol, In addition, 0.35 parts by weight of the amine-based catalyst and 0.3 parts by weight of the micro hollow body are included, nitrogen is used as the gas for formulation, 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 Polyurethane foam was prepared in μm.

[Example 4]

The polyurethane foam composition according to common conditions includes 100 parts by weight of a polyol composed 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 diol-based polyether polyol, In addition, 0.35 parts by weight of the amine-based catalyst and 0.3 parts by weight of the micro hollow body are included, nitrogen is used as the gas for formulation, 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 Polyurethane foam was prepared in μm.

[Comparative Example 1]

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

[Comparative Example 2]

Polyurethane foam according to common conditions includes 100 parts by weight of a polyol composed of 50 parts by weight of polymer polyether polyol, 35 parts by weight of lactone-based ester polyol, and 12 parts by weight of diol-based polyether polyol, and further includes an amine catalyst 0.3 parts by weight, 1.5 parts by weight of a metal catalyst, and 0.4 parts by weight of a micro hollow body, nitrogen was used as a gas for foaming, the mixing ratio of polyurethane raw materials was 60%, and the coating thickness of the gas-liquid mixture applied by the ejector was A polyurethane foam was prepared with a thickness of 150 μm.

[Comparative Example 3]

Polyurethane foam according to common conditions includes 100 parts by weight of a polyol composed of 50 parts by weight of polymeric polyether polyol, 37 parts by weight of lactone-based ester polyol, and 10 parts by weight of diol-based polyether polyol, and further includes an amine-based catalyst 0.3 parts by weight, 1.5 parts by weight of a metal catalyst, and 0.1 parts by weight of a micro hollow body, nitrogen was used as a gas for foaming, the mixing ratio of polyurethane raw materials was 60%, and the coating thickness of the gas-liquid mixture applied by the ejector was A polyurethane foam was prepared with a thickness of 150 μm.

[Comparative Example 4]

Polyurethane foam according to common conditions includes 100 parts by weight of a polyol composed of 50 parts by weight of polymeric polyether polyol, 37 parts by weight of lactone-based ester polyol, and 10 parts by weight of diol-based polyether polyol, and further includes an amine-based catalyst 0.3 parts by weight, 1.5 parts by weight of a metal catalyst, and 0.4 parts by weight of a micro hollow body, nitrogen was used as the gas for foaming, the mixing ratio of the polyurethane raw material was 60%, and the coating thickness of the gas-liquid mixture applied by the ejector was A polyurethane foam was prepared with a thickness of 150 μm.

[Comparative Example 5]

Polyurethane foam according to common conditions includes 100 parts by weight of a polyol composed of 50 parts by weight of polymeric polyether polyol, 39 parts by weight of lactone-based ester polyol, and 8 parts by weight of diol-based polyether polyol, and further includes an amine-based catalyst 0.3 parts by weight, 1.5 parts by weight of a metal catalyst, and 0.4 parts by weight of a micro hollow body, nitrogen was used as the gas for foaming, the mixing ratio of the polyurethane raw material was 60%, and the coating thickness of the gas-liquid mixture applied by the ejector was A polyurethane foam was prepared with a thickness of 150 μm.

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-based 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 antifoaming agent 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

The polyurethane foams of Examples 1 to 4 and Comparative Examples 1 to 5 were tested for density, waterproof, dustproof, and shear strength, and the results are shown in Table 2 below.

The waterproof test was conducted based on whether the polyurethane foam passed water resistance IP 8 grade or higher when the polyurethane foam was left in water for 72 hours, and the dustproof test was conducted based on whether or not the dustproof IP grade 6 or higher passed.

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 neglect 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 have waterproof rating IP (International Protection) 8 or higher and dustproof rating IP (International Protection) 6 or higher in accordance with the international standard IEC 529. It can be seen that satisfies Comparative Examples 1 to 5 have a problem in that the shear strength of the foam is weakened because the prepolymer is not added, and thus the dustproof effect is deteriorated.

Specifically, in the case of Examples 1 to 4 according to the present invention, it is found to have a thickness of 150 μm and a density of 0.5 to 0.7 g / cm ³ , 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 capable of providing sufficient waterproof and dustproof functions while having a thickness, and has excellent durability in shear strength. In particular, Examples 1 and 2 were able to confirm excellent physical properties in the shear strength test, and thus it was found that the strength of the triol-based polyether polyol was superior to that of the diol-based polyether polyol.

On the other hand, Comparative Examples 1 to 4 according to the prior art showed that the waterproof rating could not satisfy the standard value because of the low density, and Comparative Examples 2 and 3 had waterproof ratings satisfying the standard value, but in the shear strength test, It was found that the physical properties were very weak.

Having described specific parts of the present application in detail above, it is clear that these specific descriptions are only preferred embodiments for those skilled in the art, and the scope of the present application is not limited thereto.

Accordingly, the substantial scope of this application will be defined by the appended claims and their equivalents.

Claims (13)

In the waterproof polyurethane foam prepared from a composition comprising a polyol, a prepolymer, a foam stabilizer, a catalyst and a gas for foam control,
The polyol is
It includes a high-molecular polyether polyol having a number average molecular weight of 3000 to 5000, a functional group of 2 to 4, and a hydroxyl group of 25 to 30 mgKOH/g,
The prepolymer,
A waterproof polyurethane foam obtained by reaction of glycol-based ether polyol and isocyanate, having a number average molecular weight of 100 to 600, and a hydroxyl group of 200 to 400 mgKOH/g.
The method of claim 1,
The polyol is
Waterproof polyurethane foam further comprising a polyether polyol having a number average molecular weight of 100 to 1000.
The method of claim 2,
The polyether polyol having a number average molecular weight of 100 to 1000,
diol-based polyether polyols having a number average molecular weight of 100 to 600; or
A waterproof polyurethane foam characterized in that it is a triol-based polyether polyol having a number average molecular weight of 500 to 1000 and a hydroxyl group of 150 to 300 mgKOH/g.
The method of claim 2,
The polyol is
Waterproof polyurethane foam further comprising a lactone-based ester polyol.
The method of claim 4,
The lactone-based ester polyol,
A waterproof polyurethane foam having a number average molecular weight of 100 to 600 and a hydroxyl group of 200 to 400 mgKOH/g.
The method of claim 4,
30 to 70% by weight of high molecular weight polyether polyol;
10 to 50% by weight of a prepolymer;
10 to 40% by weight of a lactone-based ester polyol; and
5 to 30% by weight of a polyether polyol having a number average molecular weight of 100 to 1000; waterproof polyurethane foam comprising a.
The method of claim 1,
The composition is waterproof polyurethane foam, characterized in that it comprises a micro-hollow body.
The method of claim 1,
The polyurethane foam,
Waterproof polyurethane foam, characterized in that it contains cells with a ratio of closed cells: open cells of 9: 1 to 5: 5,
The method of claim 8,
The diameter of the closed cell is 10 to 30 μm,
Waterproof polyurethane foam, characterized in that the diameter of the open cell (open cell) is 10 to 70㎛.
The method of claim 1,
The polyurethane foam,
Based on the density of 0.3 g/cm ³ to 1 g/cm ³ ,
Water resistance is IP (International Protection) 8 or higher,
Waterproof polyurethane foam characterized by dustproofness of IP 6 or higher.
The method of claim 1,
The polyurethane foam,
Waterproof polyurethane foam, characterized in that the 50% compressive load is 30 to 65 kgf.
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㎛.
A waterproof polyurethane foam pad comprising the polyurethane foam of any one of claims 1 to 11.