KR101952323B1 - Polyurethane foam sheet for a cosmetic puff and method of manufacturing the same - Google Patents

Abstract

The present invention discloses a polyurethane foam sheet for a cosmetic puff and a process for producing the same. The polyurethane foam sheet for cosmetic puff of the present invention has a surface friction coefficient of 0.01 to 0.30 , a compression ratio of 45 to 70%, and an elastic recovery ratio of 95% or more. In the production method of the present invention, the polyurethane resin (a1) obtained by mixing 70 to 95 parts by weight of a polyurethane resin (a1) having a modulus of 100 kg / cm 2 or less and 5 to 30 parts by weight of a polyurethane resin (a2) having a modulus of 120 kg / A resin composition (A) is prepared by mixing 100 to 400 parts by weight of a water-soluble salt mixture, preparing a polyurethane resin blend liquid by using a water-miscible organic solvent, and then adding the polyurethane resin blend liquid to a film- After coating, coagulation and washing are carried out to prepare a polyurethane foam sheet and then sliced to a predetermined thickness.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyurethane foam sheet for cosmetic puffs,

The present invention relates to a polyurethane foam sheet used as a fabric for a puff which is one of cosmetic tools and a method for producing the polyurethane foam sheet.

A flexible polyurethane foam is used as a fabric of a cosmetic puff, and a batch type is known as a method of producing a polyurethane foam for a cosmetic puff. However, as is known, the batch method is not suitable for mass production due to low productivity, so it is mainly manufactured by the continuous wet method for mass production.

  However, when a liquid cosmetic product, especially a low viscosity cosmetic product, is applied to a cosmetic puff using a conventional flexible polyurethane foam, most of the cosmetic product is absorbed into the puff through the open cell and most of the cosmetic product is not attached to the skin, Of cosmetics to make a satisfactory makeup. In addition, the cosmetics absorbed into the puffs permeated the backside, soaking the clothes on the hands, and the hygienic problems such as the absorption of the puffs remaining in the air bubbles and decaying.

 In order to solve such a problem, there is a method of decreasing the bubble diameter of the open cell of the flexible polyurethane foam or decreasing the expansion ratio. In this case, absorption of cosmetics into the puff can be prevented to a certain extent, but the flexibility of the puff, which is an important characteristic of the cosmetic puff, is impaired and the product value of the puff is greatly reduced.

On the other hand, a method for producing a flexible polyurethane foam for a cosmetic puff material in a wet manner and continuously is disclosed in Patent Document 1 below. The flexible polyurethane foam disclosed in Patent Document 2 below is made to have a constant thickness by buffing.

However, the polyurethane foam produced by the buffing has a relatively rough surface roughness, and it is difficult to obtain a soft touch puff. In addition, in the conventional manufacturing method, the inorganic salt added to form the pores in the washing process is not sufficiently removed and remains in the bubbles, thereby obstructing the formation of bubbles, resulting in a disadvantage that the compressibility and the elastic recovery rate are lowered.

KR 10-1105184 B1 KR 10-1841096 B1

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a polyurethane foam sheet having an optimum elastic recovery and compression ratio required for a cosmetic puff, and a method of manufacturing the same.

In order to achieve the above object, the present invention provides a method for producing a polyurethane foam sheet for a cosmetic puff,

A polyurethane resin mixture liquid coating step of coating a polyurethane resin solution dissolved in a water-miscible organic solvent onto a substrate of a synthetic resin sheet in a sheet form; A coagulation step of coagulating the coating material coated with the polyurethane resin blend solution in a coagulation bath; A washing step of washing the coagulated coating material through the coagulation step while passing the coating material through a water bath; A drying step of drying the coated cloth washed through the water bath; And a slicing step of slicing the polyurethane foam sheet for puff having a predetermined thickness from the coated fabric dried through the drying step,

Wherein the water is washed using an osmosis water having a low ionic conductivity through filtering through a reverse osmotic membrane.

The filtered water constant used in the washing step has an ion conductivity of 10 s / cm or less. When the coated fabric is washed with the filtered low ionic conductivity constant, the residual solvent and the water-soluble salt mixture can be completely removed to uniformly form the bubbles, and the problem caused by the residual solvent can be solved.

By preparing a polyurethane foam sheet by slicing instead of buffing, a polyurethane foam sheet for puff having a low surface friction coefficient of 0.01 to 0.30 can be obtained.

In the coating step of the polyurethane resin blend liquid, a coating layer having a uniform thickness can be obtained by coating a polyurethane resin blend liquid using a slotless die coater using a pulsating pump.

According to the manufacturing method of the present invention as described above, it is possible to realize a cosmetic puff product having a soft touch by having a low surface friction coefficient by a slicing process, and by using water with a low ion conductivity during washing, It is possible to prevent an adverse effect caused by the residual solvent.

1 is a photograph of a structure of an incomplete polyurethane foam sheet in which honeycomb cells and vertical cells are mixed,
2 is a photograph of the structure of a polyurethane foam sheet for a cosmetic puff made according to the method of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail.

The method for producing a polyurethane foam sheet for makeup puff of the present invention comprises:

Mixing a polyurethane resin composition and a water-soluble salt mixture and preparing a polyurethane resin blend by using a water-miscible organic solvent;

Coating the polyurethane resin blend liquid to a predetermined thickness on the substrate while continuously conveying the film-like substrate;

A step of forming a polyurethane foam sheet by solidifying a polyurethane resin blend liquid coated on a substrate while passing through a coagulation bath;

The salt contained in the polyurethane foam sheet is dissolved in water for washing to remove fine pores in the polyurethane foam sheet while passing the polyurethane foam sheet through a water bath, and at the same time, the organic solvent contained in the polyurethane foam sheet is removed A water washing step of removing water by using water;

Drying the washed polyurethane foam sheet; And

And a slicing step of slicing the dried polyurethane foam sheet to a predetermined thickness through the drying step.

Hereinafter, each step of the method for producing a polyurethane foam sheet according to the present invention will be described in detail.

≪ Production step of polyurethane resin blend liquid >

70 to 95 parts by weight of one type of a polyurethane resin (a1) having a 100% modulus of 50 kg / cm2 or less and 5 to 30 parts by weight of one kind of a polyurethane resin (a2) having a 100% modulus of 120 kg / 100 parts by weight of a polyurethane resin composition (A); 100 to 400 parts by weight of an inorganic salt (B) in which Na ₂ SO ₄ and NaCl are mixed in a weight ratio of 7: 3 are mixed, and the mixture of the polyurethane resin composition and the inorganic salt is dissolved in 50 to 150 parts by weight of a water- To prepare a polyurethane resin blend.

The polyurethane resin composition (A) contains 70 to 95 parts by weight of a polyurethane resin (a1) having a modulus of 50 kg / cm < 2 > or less and a high tensile strength and a high elongation And 5 to 30 parts by weight of a polyurethane resin (a2) having a modulus of 120 kg / cm 2 or more at 100%. The polyurethane resins a1 and a2 used herein may be one kind of a polyurethane resin polymerized with polycarbonate, polyester or polyether-based polyol, or a mixture of two or more of polycarbonate, polyester and polyether- One kind of polymer (Co-polymer) series resin may be used.

As shown in FIG. 2, the polyurethane foam sheet produced from the polyurethane composition according to the present invention has a structure of honeycomb structure and has excellent hydrolysis resistance, tensile strength, elongation, and recovery force required for a cosmetic puff .

The physical properties of the polyurethane foam sheet produced according to the present invention, such as hydrolysis resistance, tensile strength, elongation, restoring force, and the like, are shown in Table 1 below.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Md. 35 resin a1 Polyether
60 Polyether
80 Polyether
95 polyester
100 Polyether
100 Md.150 resin a2 Poly
Carbonate
35 Polycarbonate
20 Polycarbonate
5 I hydrolyse
5% NaOH 24h Pass Pass Pass Fail Pass Tensile force (kgf / inch) 5.5 3.7 2.3 1.7 1.45 Elongation (%) 240 320 460 500 420 Resilience (%) 87 93 97 98 93

Physical properties of the polyurethane foam sheet after the production of the polyurethane foam sheet by the conventional general composition of polyester or polyether polyurethane resin were measured and shown in Comparative Example 1 and Comparative Example 2.

Cosmetic puffs should be free from the deterioration of the shape stability of the polyurethane foam and part of the foam from exposure to water or aqueous components for a long time, which is one of the important physical properties. In Comparative Example 1, as shown in Table 1, after the polyurethane foam was broken after immersion for 24 hours in a 5% aqueous solution of NaOH, which was a water dissolution test method, the function as a cosmetic puff was lost.

In Comparative Example 2, there was no problem in the hydrolysis resistance, but it did not exhibit a tensile strength higher than a certain level required for manufacturing the cosmetic puff and a superior resilience to return to the original state even when the puff was used for a long time. By recognizing such a problem, a polycarbonate-based urethane resin having excellent physical properties of a polyurethane foam sheet is mixed at a ratio of 30% or less based on the weight of the whole resin so as to exhibit optimum physical properties as a puff, Physical properties of polyurethane foam sheets having excellent tensile strength, elongation, and maximum resilience were measured in Examples 1, 2, and 3, respectively.

As the ratio of the polycarbonate-based polyurethane resin increased, the tensile strength increased and the elongation decreased. Resilience also declined as with extension. In the present invention, as a result of testing under various mixing conditions, it was found that a polyurethane resin composition in which a polyether resin was used in an amount of not less than 70 parts by weight of the total resin and a polycarbonate resin was mixed in a proportion of not more than 30 parts by weight of the total resin (A), it was confirmed that it exhibited the optimum physical properties as a cosmetic puff.

The water-soluble salt contained in the polyurethane resin compounding liquid is a pore-forming agent that forms pores in the polyurethane foam sheet. The water-soluble salt is not soluble in an organic solvent but is in the form of a salt that can dissolve well in water. Any organic compound including a period (OH < ^- & gt ^; ) can be used.

Usable inorganic salts include sodium (Na ⁺ ), potassium (K ⁺ ) ammonium (NH ₄ ⁺ ) cations having a solubility in water of 30 g or more per 100 g of reference standard at 20 ° C, or nitric acid (NO ₃ ^- ), SO ₄ ^2-) is possible if the inorganic salts, including both anionic and used, typically a sodium nitrate (NaNO _3), potassium nitrate (KNO _3), ammonium nitrate (NH ₄ NO _3), magnesium nitrate (Mg (NO _{3) 2),} calcium nitrate _{(Ca (NO 3) 2)} , aluminum nitrate (Al (NO _{3) 2)} nitrates, such as, sodium sulfate (Na ₂ SO _4), potassium sulfate (K ₂ SO _4), ammonium sulfate ((NH ₄ ) ₂ SO ₄ ) or a sodium salt such as sodium carbonate (Na ₂ CO ₃ ), sodium chloride (NaCl), or a potassium salt such as potassium carbonate (K ₂ CO ₃ ) can be used.

And an organic compound containing a hydroxy group is glucose _{(Glucose, C 6 H 12 O} 6), fruit sugar _{(Fructose, C 6 H 12 O} 6), galactose monosaccharides, sucrose, such as _{(Galactose, C 6 H 12 O} 6) ( Disaccharides such as sucrose, C ₁₂ H ₂₂ O ₁₁ , maltose, C ₁₂ H ₂₂ O ₁₁ and lactose C ₁₂ H ₂₂ O ₁₁ , cellulose, starch, glycogen, ), Polysaccharides such as polyvinyl alcohol (PVA), sorbitol and xylitol, citric acid, sodium saccharin, calcium acetate, Or the like may be used.

Preferably, sodium sulfate having a solubility of 44 grams at 20 DEG C is typically used but is not limited thereto.

If the water-soluble salt mixture exceeds 400 parts by weight based on 100 parts by weight of the polyurethane resin composition, the viscosity of the polyurethane resin blend becomes high and the fluidity of the polyurethane resin blend solution lowers, do. On the other hand, when the water-soluble salt mixture is 100 parts by weight or less based on 100 parts by weight of the polyurethane resin composition, the viscosity of the polyurethane resin blend solution is lowered so that the coating operation becomes smooth, but it is difficult to apply the water- It was confirmed that a honeycomb-shaped cell as a cosmetic puff was not formed and that some vertical cells were formed. (See Fig. 1)

Further, the size of the water-soluble salt mixture has a significant influence on the pore size of the polyurethane foam sheet, and thus the particle size is also important. In the present invention, the water-soluble salt mixture preferably has a particle size of 150 mu m or less.

<Coating Step>

The polyurethane resin compounding liquid is coated on a substrate to be continuously transported using a slot die coater to a uniform thickness over the entire width of the substrate. It is preferable to use a pulsating pump so as to smoothly discharge the polyurethane resin blend liquid from the slot die coater, but the present invention is not limited thereto. The comma coater or knife coater is generally exposed to the outside because of the exposure of the coating composition to moisture in the air, which causes layer separation and viscosity change of the compound liquid. Deviations of the work site, ie, It brings a difference in quality. On the other hand, the slot die coater can be coated while discharging the coating composition liquid at a constant pressure by using the non-pulsating pump with the blend liquid being shielded from the outside, so that the thickness and quality deviation can be minimized.

Here, it is preferable to use a PET film as the substrate. When this PET film is used after corona, plasma pretreatment or sanding, or heat emboss preprocessing, adhesion of the polyurethane resin blend solution on the substrate can be improved. When the PET film is sanded, embossed and printed, it is advantageous in that the pattern or unevenness of the surface of the PET film is transferred to the back surface of the polyurethane foam sheet, so that printing or embossing is not required. When a PET film is used as a coating material, it is possible to prevent cells from being unevenly formed due to penetration of water from the back surface of the coating material when using a conventional nonwoven fabric or fabric. In addition, pre-treatment such as sanding heat embossing and printing on the surface of the PET film improves the adhesion of the polyurethane foam sheet to prevent pre-separation of the polyurethane foam sheet inside the coagulation bath, Can be produced. In addition, it is possible to improve work efficiency by previously applying the embossing and printing process in the post-processing to the PET film in order to realize the pattern after forming the existing polyurethane foam film.

<Coagulation phase>

The polyurethane resin mixture liquid coated on the PET substrate is solidified while passing through an aqueous solution of 20 to 40 DEG C containing 10% or less of DMF to form a polyurethane foam sheet.

<Washing step>

In the water washing step, it takes a long time to completely remove the inorganic salts in the polyurethane foam sheet due to the high ionization degree in the water for washing with conventional industrial water or ground water. In the present invention, in order to efficiently remove the water-soluble salt mixture remaining in the polyurethane foam sheet in a short period of time during the washing process after solidification in the production of the polyurethane foam sheet made of the cosmetic puff, the industrial water is filtered with the reverse osmosis membrane And then water is washed with an RO constant having an ion conductivity of 10 μs / cm or less, whereby the residual organic solvent and the water-soluble salt mixture are removed from the polyurethane foam sheet to uniformly form a cell, The problems caused by the organic solvent and the water-soluble salt mixture can be prevented.

<Drying step>

In the drying step, the washed polyurethane foam sheet is dried at a chamber temperature of 80 to 120 degrees.

<Slicing step>

The polyurethane foam sheet dried through the drying step is sliced to a predetermined thickness. By obtaining the polyurethane foam sheet by slicing, a polyurethane foam sheet having excellent surface roughness can be produced as compared with the buffing.

When sliced, the surface of the sliced polyurethane foam sheet has a friction coefficient in the range of 0.01 to 0.30. When the polyurethane foam sheet produced under the same process conditions is buffed, it exhibits a range of 0.32 to 0.98 depending on the grit as the particle size of the sandpaper, and the surface roughness is rougher than that of slicing. Sandpaper Grit When buffing with sandpaper of 400 or more, the coefficient of friction of the surface of the product is in the range of 0.32 to 0.60 and the product is commercially available, but the surface touch is not better than the product produced by the slicing process. Accordingly, in order to achieve an optimal surface softness as a cosmetic puff, the present invention has been carried out not only in the sanding process but also in slicing to improve the surface roughness while adjusting the thickness uniformity.

In addition, buffing is carried out in order to prevent the residual surface of the product due to the incomplete removal of the buffing powder generated during the buffing process, the phenomenon that the surface of the sanded polyurethane layer is weakened and the excessive consumption of the cosmetic liquid due to excessive pore during sanding (DMF) or methyl ethyl ketone (MEK) alone or in combination with the surface of the polyurethane foam sheet to form pores on the surface by printing with a printing roll of 80 to 180 mesh, I could solve the problem.

Claims (10)

A method for producing a polyurethane foam sheet for makeup puff,
(A) wherein 70 to 95 parts by weight of a polyurethane resin (a1) having a modulus of 50 kg / cm 2 or less and 5 to 30 parts by weight of a polyurethane resin (a2) having a modulus of 120 kg / Mixing 100 to 400 parts by weight of a water-soluble salt mixture with 100 parts by weight of the water-soluble salt mixture to prepare a polyurethane resin blend using the water-miscible organic solvent;
Coating the polyurethane resin blend liquid to a predetermined thickness on the substrate while continuously conveying the film-like substrate;
A step of forming a polyurethane foam sheet by solidifying a polyurethane resin blend liquid coated on a substrate while passing through a coagulation bath;
The water-soluble salt mixture contained in the polyurethane foam sheet is dissolved in water for washing to form micropores in the polyurethane foam sheet while passing the polyurethane foam sheet through a water bath, and at the same time, the organic solvent contained in the polyurethane foam sheet Washing step to remove by the water of the bath;
Drying the washed polyurethane foam sheet; And
And a slicing step of slicing the polyurethane foam sheet dried through the drying step to a predetermined thickness. &Lt; RTI ID = 0.0 &gt; 21. &lt; / RTI &gt; The method according to claim 1,
Wherein the surface of the sliced polyurethane foam sheet in the slicing step has a surface friction coefficient of 0.01 to 0.30. The method according to claim 1,
Wherein the purified water used in the washing step is filtered with an reverse osmosis membrane to have an ion conductivity of 10 s / cm or less. The method according to claim 1,
Wherein the polyurethane resin blend liquid coating step comprises coating the polyurethane resin blend liquid using a pulsating pump and a slot die coater. delete The method according to claim 1 ,
The polyurethane resin (a1, a2) may be a copolymer of two or more of polycarbonate, polyester, polyurethane resin polymerized with polyether polyol, polycarbonate, polyester or polyether polyol Wherein one of the resins is used as the poured polyurethane foam sheet. The method according to claim 1 ,
The water-soluble salt mixtures, sodium nitrate (NaNO _3), potassium nitrate (KNO _3), ammonium nitrate (NH ₄ NO _3), magnesium nitrate _{(Mg (NO 3) 2)} , calcium nitrate (Ca (NO _{3) 2)} , aluminum nitrate _{(Al (NO 3) 2)} , sodium sulfate (Na ₂ SO _4), potassium sulfate (K ₂ SO _4), ammonium sulfate _{((NH 4) 2 SO 4} ), sodium carbonate (Na ₂ CO _3), sodium chloride (NaCl), and and potassium carbonate (K ₂ CO ₃₎ one or more inorganic salts selected from the group consisting of glucose _{(glucose, C 6 H 12 O} 6), fruit sugar _{(fructose, C 6 H 12 O} 6), galactose _{(galactose, C 6 H 12 O} 6), sucrose _{(sucrose, C 12 H 22 O} 11), maltose _{(maltose, C 12 H 22 O} 11), lactose _{(lactose, C 12 H 22 O} 11), cellulose ( Organic compounds containing at least one hydroxyl group (OH ^- ) selected from the group consisting of polyvinyl alcohol (PVA), sorbitol, xylitol (cellulose), starch (starch), and glycogen Xylitol, citric acid, sodium saccharin im Saccharin, and calcium acetate. The method for producing a polyurethane foam sheet for a cosmetic puff according to claim 1, wherein the water-soluble organic salt is a mixture of at least one water-soluble organic salt. The method according to claim 1,
Wherein the film-like base material has a pattern or unevenness formed on its surface by sanding, heat embossing, or printing to transfer the pattern or concavity and convexity to the back face of the polyurethane foam sheet. A method for producing a polyurethane foam sheet for makeup puff,
Mixing a polyurethane resin composition and a water-soluble salt mixture and preparing a polyurethane resin blend by using a water-miscible organic solvent;
Coating the polyurethane resin blend liquid to a predetermined thickness on the substrate while continuously conveying the film-like substrate;
A step of forming a polyurethane foam sheet by solidifying a polyurethane resin blend liquid coated on a substrate while passing through a coagulation bath;
The coagulated polyurethane foam sheet is passed through a water bath, and the water-soluble salt mixture contained in the polyurethane foam sheet is dissolved in water for washing to form micropores in the polyurethane foam sheet. At the same time, the micropores contained in the polyurethane foam sheet A washing step of removing the solvent with water in a water bath;
Drying the washed polyurethane foam sheet; And
The surface of the dried polyurethane foam sheet is surface treated with dimethylformamide (DMF), methyl ethyl ketone (MEK) alone or a mixture thereof to form pores on the surface of the polyurethane foam sheet ; &Lt; / RTI &gt;
70 to 95 parts by weight of a polyurethane resin (a1) having a 100% modulus of 50 kg / cm 2 or less and 5 to 30 parts by weight of a polyurethane resin (a2) having a 100% modulus of 120 kg / cosmetic characterized in that the mixture, relative to 100 parts by weight of a polyurethane resin composition (a) mixing portion, and the mixture a water-soluble salt from 100 to 400 parts by weight, to prepare a polyurethane resin formulated solution using a water-miscible organic solvent puff A method for producing a polyurethane foam sheet. delete

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