JP2009263551A - Deodorizing polyurethane foam - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deodorizing polyurethane foam having a high oxidation/decomposition performances for volatile organic compounds (VOCs) such as acetaldehydes, and exhibiting these performances over a long period of time. <P>SOLUTION: The polyurethane foam is prepared by foaming a raw material containing polyols, polyisocyanates, a blowing agent, a catalyst, and a deodorant. The deodorant comprises an inorganic porous material carrying a metallic compound. The metallic compound comprises a compound which oxidizes and decomposes the volatile organic compounds while being oxidized itself and is restored into the original metallic compound by being reduced with moisture. The amount of the deodorant is 5-40 pts.mass per 100 pts.mass of the polyols, and the surface 12 of the polyurethane foam 11 is molten by the flame treatment and is then solidified. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a deodorant polyurethane foam foamed from a polyurethane raw material containing a deodorant.

  Conventionally, polyurethane foam has been widely used as a cushion for automobile and residential interior materials such as automobile seats, headrests, residential chairs, sofas, and wall materials.

  In addition, in interior materials for homes and automobiles, inorganic porous materials such as activated carbon and zeolite are used to reduce volatile organic compounds (VOC) such as aldehydes and to reduce odors as a countermeasure against sick house syndrome. It has been proposed to include an adsorbent composed of a solid material in a polyurethane foam.

Also proposed is a deodorant polyurethane foam that is foamed by containing an adsorption / decomposition type deodorant that can be used again and again by oxidation-reduction reaction in the raw material of the polyurethane foam (patent) Reference 1).
JP 2008-50556 A

  However, when an adsorbent composed of an inorganic porous material such as activated carbon or zeolite is contained in the polyurethane foam, there is an adsorption limit due to saturation of the adsorbed material adsorbed on the adsorbent, and the adsorption once adsorbed on the adsorbent. There is a problem that the substance is re-released from the adsorbent by heating or vibration of the polyurethane foam, and the volatile organic compound (VOC) concentration in the room or in the vehicle is increased again. On the other hand, a deodorant polyurethane foam containing an adsorption / decomposition type deodorant that can be used again and again by oxidation-reduction reaction is an oxidation / decomposition to volatile organic compounds (VOC) such as aldehydes. Although it has the advantage that performance can be demonstrated over a long period of time, further improvement in deodorizing properties is required.

  The present invention has been made in view of the foregoing points, and has a high oxidation / decomposition performance with respect to volatile organic compounds (VOC), and is a deodorant polyurethane foam capable of exhibiting the high oxidation / decomposition performance over a long period of time. For the purpose of provision.

  The invention according to claim 1 is a polyurethane foam in which a raw material containing a polyol, a polyisocyanate, a foaming agent, a catalyst, and a deodorant is foamed, wherein the deodorizer is an inorganic porous material carrying a metal compound. And the metal compound oxidizes and decomposes the volatile organic compound and also oxidizes itself. After the oxidation and decomposition, the metal compound itself is reduced by moisture to return to the original metal compound. The surface relates to a deodorizing polyurethane foam characterized by comprising a solidified material after hot melting.

  According to a second aspect of the present invention, in the first aspect, the thermal melting of the polyurethane foam is performed by a flame treatment in which the surface of the polyurethane foam is blown with a flame.

  The invention of claim 3 is characterized in that, in claim 1 or 2, the amount of the deodorant is 5 to 40 parts by mass per 100 parts by mass of the polyols.

  The invention of claim 4 is characterized in that, in any one of claims 1 to 3, the metal compound of the deodorant is an iron-based compound or a silver-based compound.

  A fifth aspect of the present invention is characterized in that in any one of the first to fourth aspects, the volatile organic compound is an aldehyde.

  According to the present invention, the deodorant composed of the inorganic porous material supporting the metal compound does not melt by the thermal melting of the surface of the polyurethane foam. Precipitates effectively and comes into contact with the outside air, further improving the deodorizing effect. In addition, since heat is applied to the inorganic porous body when the polyurethane foam surface is melted by heat, the deodorizing action of the inorganic porous body itself can be reactivated, and this also increases the deodorizing effect.

  Further, according to the present invention, the metal compound supported on the inorganic porous body oxidizes and decomposes the volatile organic compound and also oxidizes itself, and after the oxidation and decomposition, the metal compound is reduced by moisture to the original. Since the deodorant polyurethane foam of the present invention is made of a compound that returns to a metal compound, when the volatile organic compound such as an aldehyde is touched, the metal compound oxidizes the aldehyde to a carboxylic acid, and further carbon dioxide and water. In this case, the adsorbate is not saturated, and the metal compound itself is oxidized, but it is reduced by the moisture in the air and returns to the original reduced state. It can exhibit oxidation and decomposition functions for compounds.

Examples of the present invention will be described in detail below. FIG. 1 is a cross-sectional view of a deodorant polyurethane foam according to an embodiment of the present invention.
A deodorant polyurethane foam 10 shown in FIG. 1 is formed by solidifying a surface 12 of a polyurethane foam 11 after being melted by heat, and is used as a cushion for a building (house, office, etc.) and automobile interior material or furniture. Is preferred. For example, interior materials for buildings can include wall materials, etc., and interior materials for automobiles can include seats, headrests, door linings, etc., and furniture can be chairs, sofas, etc. , Beds and the like.
It is.

  The polyurethane foam is made by foaming a raw material containing polyols, polyisocyanates, a foaming agent, a catalyst and a deodorant.

  As the polyols, any one of known polyether polyols, polyester polyols and polyether ester polyols used for polyurethane foams may be used alone or in admixture of two or more.

  Examples of the polyether polyol include polyhydric alcohols such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, neopentyl glycol, glycerin, pentaerythritol, trimethylolpropane, sorbitol, and sucrose, or polyhydric alcohols thereof. The polyether polyol which added alkylene oxides, such as ethylene oxide and a propylene oxide, can be mentioned. Polyester polyols are polycondensed from aliphatic carboxylic acids such as malonic acid, succinic acid and adipic acid and aromatic carboxylic acids such as phthalic acid and aliphatic glycols such as ethylene glycol, diethylene glycol and propylene glycol. The polyester polyol obtained in this way can be mentioned. Examples of the polyether ester polyol include those obtained by reacting the polyether polyol with a polybasic acid, or those having both the polyether and polyester segments in one molecule. In addition, as polyols, what contains the polyester polyol and polyetherester polyol which are excellent in the acceleration | stimulation of the solidification after heat melting is preferable. Among these, a combination of a polyether ester polyol and a polyether polyol is preferred because of demands for cushion characteristics and strain characteristics.

  The polyisocyanate may be aromatic, alicyclic or aliphatic, and may be a bifunctional isocyanate having two isocyanate groups in one molecule, or three in one molecule. A tri- or higher functional polyisocyanate having the above isocyanate group may be used, and these may be used alone or in combination.

  For example, as the bifunctional polyisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, m-phenylene diisocyanate, p-phenylene diisocyanate, 4,4′-diphenylmethane diisocyanate, 2,4 ′ -Aromatics such as diphenylmethane diisocyanate, 2,2'-diphenylmethane diisocyanate, xylylene diisocyanate, 3,3'-dimethyl-4,4'-biphenylene diisocyanate, 3,3'-dimethoxy-4,4'-biphenylene diisocyanate Cyclohexane-1,4-diisocyanate, isophorone diisocyanate, dicyclohexylmethane-4,4′-diisocyanate, methylcyclohexane diisocyanate, and the like, butane-1, - diisocyanate, hexamethylene diisocyanate, isopropylene diisocyanate, methylene diisocyanate, there may be mentioned aliphatic, such as lysine isocyanate.

  Trifunctional or higher polyisocyanates include 1-methylbenzole-2,4,6-triisocyanate, 1,3,5-trimethylbenzole-2,4,6-triisocyanate, biphenyl-2,4,4. '-Triisocyanate, diphenylmethane-2,4,4'-triisocyanate, methyldiphenylmethane-4,6,4'-triisocyanate, 4,4'-dimethyldiphenylmethane-2,2', 5,5 'tetraisocyanate, Examples thereof include triphenylmethane-4,4 ′, 4 ″ -triisocyanate, polymeric MDI, etc. In addition, other urethane prepolymers can also be used. For example, a kind of aliphatic isocyanate And it may be used in combination of two kinds of aromatic isocyanates.

  In addition, as for the isocyanate index of polyisocyanate, 100-130 are preferable. Isocyanate index is an index used in the field of polyurethane, and is a polyisocyanate for active hydrogen groups in raw materials (for example, active hydrogen groups contained in active hydrogen groups such as hydroxyl groups of polyols and water as a blowing agent). It is the numerical value which represented the equivalent ratio of the isocyanate group of a kind with a percentage.

  As the foaming agent, water, pentane, cyclopentane, hexane, cyclohexane, dichloromethane, carbon dioxide gas or the like is used. When the foaming agent is water, the addition amount is determined within a range in which a target density and a good foamed state can be obtained, and usually 1 to 5 parts by mass is preferable with respect to 100 parts by mass of polyols. When the amount of the foaming agent is less than 1 part by mass, foaming becomes insufficient, and it becomes difficult to obtain a low-density polyurethane foam. When the amount of the foaming agent exceeds 5 parts by mass, the foam becomes excessive and the hardness, strength and the like of the foam are lowered.

  As the catalyst, those known for polyurethane foams can be used. For example, amine catalysts such as triethylamine, triethylenediamine, diethanolamine, dimethylaminomorpholine, N-ethylmorpholine, tetramethylguanidine, tin catalysts such as stannous octoate and dibutyltin dilaurate, phenylmercurypropionate or lead octenoate And metal catalysts (also referred to as organometallic catalysts). The general amount of the catalyst is preferably 0.2 to 2.0 parts by mass with respect to 100 parts by mass of polyols. When the amount of the catalyst is less than 0.2 parts by mass, the reaction becomes insufficient and the mechanical properties of the polyurethane foam are lowered. On the other hand, when the amount of the catalyst exceeds 2.0 parts by mass, the progress of the reaction becomes abrupt, the balance between the urethanization reaction and the foaming reaction is lost, and the strain characteristic of the polyurethane foam is lowered.

As the deodorant, a room temperature solid inorganic porous material carrying a metal compound is used. The loading in the present invention refers to a state in which the metal compound is held on the inorganic porous body by physical or chemical adsorption. The inorganic porous body is made of zeolite, sepiolite, aluminum oxide, silica or the like and has a physical adsorption action. The metal compound supported by the inorganic porous body oxidizes and decomposes volatile organic compounds (VOC) such as aldehydes such as acetaldehyde and formaldehyde, and also oxidizes itself. After the oxidation and decomposition, the metal compound is reduced by moisture. It is composed of a compound that is returned to the original metal compound. Examples of the metal compound include ferrous sulfate (FeSO ₄ ), ferrous oxide (FeO), ferrous chloride (FeCl ₂ ) and other iron-based compounds (divalent iron compounds), silver oxide (Ag ₂ O). Silver compounds (monovalent silver compounds) such as silver nitrate (AgNO ₃ ), silver chloride (AgCl), and silver sulfate (Ag ₂ SO ₄ ) are used. The metal compound preferably contains a chelating agent such as EDTA (ethylenediaminetetraacetic acid) in order to form and stabilize a chelate compound with metal ions.

Oxidation and decomposition of volatile organic compounds (VOC) such as aldehydes by the metal compound are performed as follows. For example, acetaldehyde (CH ₃ CHO) is converted into acetic acid (CH ₃ COOH) by oxidation with the metal compound as [CH ₃ CHO → CH ₃ COOH → CO ₂ + H ₂ O], and the acetic acid is further oxidized and decomposed. To carbon dioxide (CO ₂ ) and water (H ₂ O). Further, formaldehyde (HCHO) becomes formic acid (HCOOH) by oxidation with the metal compound as [HCHO → HCOOH → CO ₂ + H ₂ O], and the formic acid is further oxidized and decomposed to form carbon dioxide (CO ₂ ). And water (H ₂ O).

The metal compound itself is oxidized in the process of oxidation and decomposition of volatile organic compounds (VOC) such as aldehydes, and after the oxidation and decomposition, the metal compound itself is reduced by moisture to return to the original metal compound. For example, ferrous sulfate (FeSO ₄₎ is oxidized to ferric sulfate _[(Fe 2 _{(SO 4) 3],} the water of the ferric sulfate _[(Fe 2 _{(SO 4) 3]} is in the air ( It is reduced by the reducing agent) to return to the original ferrous sulfate (FeSO ₄ ), and monovalent silver oxide (Ag ₂ O) is oxidized to divalent silver oxide (AgO), and the divalent oxidation thereof. Silver is reduced by moisture in the air (reducing agent) to return to the original monovalent silver oxide (Ag ₂ O) Therefore, the metal compound oxidizes volatile organic compounds (VOC) such as aldehydes, Further, the repetition of returning from the reduced state to the reduced state through the oxidized state can be repeated, for example, 10 times or more, and the deodorizing action can be maintained for a long time.

  The content of the metal compound supported on the inorganic porous body is preferably in the range of 0.3 to 6.0% in the deodorant. Further, since the content of the metal compound in the deodorant polyurethane foam is supported on the inorganic porous body, the range of 0.01 to 2.0 parts by mass per 100 parts by mass of the polyols is deodorant performance. Is preferable in that it can be exhibited quickly and over a long period of time. Moreover, the content of the deodorant with respect to the deodorant polyurethane foam is preferably in the range of 5 to 40 parts by mass per 100 parts by mass of the polyols. When the amount is less than 5 parts by mass, the deodorizing effect becomes insufficient. On the other hand, when the amount exceeds 40 parts by mass, the mechanical properties of the polyurethane foam are remarkably lowered by the addition of an excessive deodorant.

  The particle size of the deodorant is preferably 20 to 100 μm. If the particle size of the deodorizer is less than 20 μm, long-term deodorization performance can be maintained, but since the particle size is smaller than the width of the cell skeleton of the polyurethane foam, rapid deodorization performance is achieved. It becomes difficult to demonstrate. On the other hand, if the particle size of the deodorant exceeds 100 μm, the foam stability of the polyurethane foam may be inhibited by the deodorant during foaming of the polyurethane foam, and the deodorant particles are too large. There is a risk that the deodorant may fall off the polyurethane foam.

  In addition, additives such as a foam stabilizer, a colorant, and a crosslinking agent are appropriately added to the foaming raw material. The foam stabilizer is preferably added to the polyurethane raw material in order to obtain a polyurethane foam in a good cell state. As a foam stabilizer, a well-known thing used for manufacture of a polyurethane foam can be used. Examples thereof include silicone compounds, anionic surfactants such as sodium dodecylbenzenesulfonate and sodium lauryl sulfate, polyether siloxane, and phenolic compounds. Among these, a linear or branched polyether-siloxane copolymer is preferable, and a linear polysiloxane-polyoxyalkylene copolymer is more preferable in order to improve the connectivity. The content of the foam stabilizer is preferably 0.5 to 2.5 parts by mass per 100 parts by mass of polyols. When the amount is less than 0.5 part by mass, the foam regulating action cannot be sufficiently exhibited, and it becomes difficult to obtain a good polyurethane foam. On the other hand, when it exceeds 2.5 parts by mass, the foam regulating action becomes too strong, and the communication property is lowered.

  The polyurethane foam 11 is manufactured by a known polyurethane manufacturing method, and may be either a one-shot method or a prepolymer method. The one-shot method is a method in which a polyol is obtained by directly reacting a polyisocyanate with a polyisocyanate in the presence of a foaming agent, a catalyst, a foam stabilizer, and the like. This is a method in which a prepolymer having an isocyanate group at the end is produced by reacting a polymer, and the prepolymer and a polyol are reacted in the presence of a foaming agent, a catalyst, a foam stabilizer, and the like to obtain a foam.

  The polyurethane foam 11 may be either mold foam or slab foam. Mold foaming is a method in which a polyurethane material is filled in a mold (molding die) and foamed into the inner shape of the mold. On the other hand, slab foaming is performed by mixing polyurethane raw materials with a known polyurethane foam molding apparatus and discharging it onto paper or film on a conveyor, or discharging it into an open space other than the conveyor under atmospheric pressure. This is done by foaming and curing at room temperature. In the case of slab foaming, it is formed into a predetermined size and shape by cutting after foaming.

The physical properties of the polyurethane foam 11 are appropriately determined according to the use of the deodorant polyurethane foam 10. For example, the apparent density (according to JIS K 7222 (1999)) 20 to 100 kg / m ³ , hardness (JIS) K6400-2 (2004, D method compliant) 50-250N, tensile strength (based on JIS K6400-5 (2004)) 70-200 kPa, elongation (based on JIS K6400-5 (2004)) 80-300%, compression strain ( JIS K6400-4 A method) 0.5 to 10.0%.

  The surface 12 of the polyurethane foam 11 is made by solidifying after heat melting. The surface 12 is melted by subjecting the surface 12 of the polyurethane foam to heat melting, and the melted surface is solidified by natural cooling after the heat melting. As the heat melting treatment, a method of subjecting the surface of the polyurethane foam to a surface melting treatment via a heat medium or a flame treatment is preferable. The surface melting treatment is, for example, a method in which a hot roll of 300 to 400 ° C. is pressed against the surface of the polyurethane foam to melt the surface of the polyurethane foam, and a molten solid or a molten film is formed on the surface of the polyurethane foam. It is. The flame treatment is also called a flame treatment, and is a treatment in which the surface of the polyurethane foam is blown with a flame of a gas burner using city gas, propane gas or the like. The flame of the gas burner is preferably 600 to 1000 ° C. Since the inorganic porous material of the deodorizer has a high melting temperature, even if the surface 12 of the polyurethane foam 11 is thermally melted by a heat melting treatment, it exists on the surface 12 of the polyurethane foam 11 without melting. And the said deodorizer precipitates on the surface 12 after the solidification of the polyurethane foam 10, and the contact efficiency with external air improves. Further, when the surface 12 of the polyurethane foam is heat-melted, the inorganic porous body present on the surface 12 of the polyurethane foam 11 is reactivated by heat, and the deodorizing action of the inorganic porous body itself is high. It will be a thing.

  In addition, since the said polyurethane foam 11 is a thing with quick solidification of a melt-processed surface after a heat-melting process, as a polyol, at least polyester polyol or polyetherester polyol is 20 per 100 mass parts of all polyols. It is preferable that -100 mass parts is contained. In addition, the surface of the polyurethane foam 11 to be heat-melted is preferably the entire surface of the polyurethane foam 11, but the surface that is blocked by a metal plate or the like during use is not melted by heat. You may make it heat-melt only the surface which contacts external air, without processing. In the illustrated example, only the surface 12 on both sides is hot-melted, and the other surface (side surface) 13 is not hot-melted.

  Each raw material is mixed based on the blending of the polyurethane raw materials shown in Table 1 and Table 2, injected into a foaming container having a length, width and depth of 500 mm each, foamed at normal temperature and atmospheric pressure, and then passed through a heating furnace. The soft slab polyurethane foam of Examples 1-7 and Comparative Examples 1-6 was obtained by making it harden | cure (cure).

  The raw material of Table 1 and Table 2 is demonstrated. Polyol A is polyether polyol, molecular weight 3000, hydroxyl value 56 mgKOH / g, functional group number 3, Sanyo Chemical Industries, product number GP-3050, polyol B is polyether polyester polyol, molecular weight about 3000, hydroxyl value 56 mgKOH / g, functional group number 3, manufactured by Mitsui Takeda Chemical Co., Ltd., product number L-50. Amine catalysts include N, N-dimethylaminohexanol, Kao Corporation, Kaorizer No. 25, the metal catalyst is dibutyltin dilaurate, manufactured by Johoku Chemical Industry Co., Ltd., MRH110, and the foam stabilizer is a silicone foam stabilizer, Degussa Japan Co., Ltd., B8110.

Deodorant A contains 0.5% by mass of ferrous sulfate (FeSO ₄ ) as a metal compound in zeolite as an inorganic porous material, contains a chelating agent (EDTA), and the like, and has a particle size of 30 to 50 μm. Products with an average particle size of 40 μm. Deodorant B is a zeolite as an inorganic porous material that supports 0.5% by mass of ferrous sulfate (FeSO ₄ ) as a metal compound, contains a chelating agent (EDTA), etc., and has a particle size of 80 to 100 μm. Products with an average particle size of 90 μm. Deodorant C is a material in which 0.5% by mass of silver oxide (Ag ₂ O) as a metal compound is supported on zeolite as an inorganic porous material, and contains a chelating agent (EDTA), and has a particle size of 30 to 50 μm ( Products with an average particle size of 40 μm). Deodorant D is molecular sieve, manufactured by Union Showa Co., Ltd., and molecular sieve 3A. Deodorant E is 3,3 ′, 4 ′, 5,7-flavanphenol.

  The polyisocyanate is tolylene diisocyanate (mass ratio of 2,4-tolylene diisocyanate and 2,6-tolylene diisocyanate = 80/20), manufactured by Nippon Polyurethane Industry Co., Ltd., T-80. In Tables 1 and 2, the compounding numbers indicate parts by mass.

  For the polyurethane foams of Examples 1 to 7 and Comparative Examples 1 to 6, the apparent density (based on JIS K 7222 (1999)), hardness (based on JIS K6400-2 (2004, method D)), elongation (JIS) K6400-5 (2004) compliant) and compressive strain (based on JIS K6400-4 A method) were measured. The measurement results are as shown in Tables 1 and 2.

  Further, the polyurethane foams of Examples 1 to 7 were cut into blocks of 400 × 200 × 12 mm, and both surfaces of the block-like polyurethane foam were subjected to heat melting treatment to melt the surface of the polyurethane foam, The deodorized polyurethane foam of Examples 1-7 was obtained by solidifying.

  Examples 1 to 4 are the same deodorant, and the amount of the deodorant was changed from 5 to 30 parts by mass per 100 parts by mass of polyols. Examples 2 and 5 were the deodorant particle size. Different examples, Example 2 and Example 6 are examples in which the particle size of the deodorant and the amount of the deodorant are kept constant, and the type of the deodorant is different, and Examples 2 and 7 are hot-melted. This is an example in which the treatment is different between flame treatment and surface melting treatment. The flame treatment was performed by blowing the surface of the polyurethane foam for 1 second with a propane gas burner flame (600 to 800 ° C.). On the other hand, the surface melting treatment was performed by melting the surface of the polyurethane foam with a hot roll by about 2 mm. In Example 7 in which the surface melting treatment was performed, a melted coating film was formed on the melt-treated surface of the polyurethane foam.

  Comparative Example 1 and Comparative Example 2 were a polyurethane foam not containing a deodorant, an example in which no heat melting treatment was performed (Comparative Example 1) and an example in which a flame treatment was performed as a heat melting treatment (Comparative Example 2), In Comparative Examples 3 and 4, a polyurethane foam containing an inorganic porous material (molecular sieve) as a deodorant was subjected to flame treatment as an example (Comparative Example 3) not subjected to heat melting treatment and heat melting treatment. Examples (Comparative Example 4) and Comparative Examples 5 and 6 were prepared by heating the polyurethane foam containing an organic deodorant E (3,3 ', 4', 5,7-flavanphenol) as a deodorant. An example in which the melting treatment is not performed (Comparative Example 5) and an example in which the flame treatment is performed as the thermal melting treatment (Comparative Example 6).

  For the deodorant polyurethane foams of Examples and Comparative Examples, the effect of reducing acetaldehyde was measured as follows. After putting the samples of Examples and Comparative Examples having a length of 100 mm, a width of 100 mm, and a thickness of 10 mm into a 5 L fluororesin bag, the concentration of acetaldehyde in clean air (humidity 50%) is 50 ppm. The concentration in the bag was adjusted. Next, the bag was placed in a thermostatic bath at 25 ° C., and the concentration of acetaldehyde was measured with a detector tube after 23 hours. Thereafter, the inside of the thermostatic chamber was heated to 80 ° C., and after 2 hours, the concentration of acetaldehyde was measured with a detector tube.

  Each measurement result is shown in the “aldehyde reduction” column of Tables 1 and 2. The values of “Unchanged rate:%, 23/0 hr ratio” in the aldehyde reduction column of Tables 1 and 2 are the values of [ppm after 23 hours / ppm of 0 hours (initial value) × 100]. The ratio of aldehyde that was not treated in 23 hours is shown, and the smaller this value, the greater the aldehyde reduction effect. Moreover, about an Example, the measurement of an aldehyde reduction effect was performed with respect to the polyurethane foam which has not been heat-melted as a comparison object, and the measurement result is shown in the “untreated” column of the aldehyde reduction result column in Table 1. Indicated. The value in the “Difference with or without treatment:%” column in Table 1 is the calculation result of [value with treatment / unprocessed value × 100] in the measurement result after 23 hours. It shows that the aldehyde reduction effect in the sample is large.

  From the results shown in Table 1 and Table 2, in Examples 1 to 7, the measured value of aldehyde is smaller after 23 hours than after 0 hours, and the aldehyde reduction effect is exhibited. Recognize. In addition, in the same polyurethane foam, after 23 hours of heat treatment with and without heat treatment, the value of ppm shows that the concentration of aldehyde is smaller with the treatment than with the untreated material. It can be seen that the aldehyde reduction effect, that is, the aldehyde oxidation and decomposition action is enhanced. This can also be seen from the fact that the value of unchanged rate:% is smaller in the presence of processing than in the unprocessed state, and the difference:% in the presence / absence of processing is smaller than 100. Further, when the aldehyde reduction results of Example 2 in which the thermal melting treatment is flame treatment and Example 7 in the surface melting treatment are viewed, the rate of change:%, the 23/0 hr ratio is the value in Example 2 where the flame treatment is performed. Since the surface melting treatment is smaller than Example 7, it can be seen that the flame treatment has a higher aldehyde reduction effect due to oxidization and decomposition of the aldehyde than the surface melting treatment. This is presumed that the melt coating formed on the surface of the polyurethane foam by the surface melting treatment hinders the breathability of the polyurethane foam and prevents contact between the outside air and the deodorant inside the polyurethane foam. Is done. Further, in Examples 1 to 7, after measurement after 23 hours, even when heated at 80 ° C. for 2 hours, the concentration of aldehyde does not increase, and oxidation and decomposition performance of acetaldehyde can be demonstrated over a long period of time. After: It can be seen from the ppm value.

  For these reasons, the volatile organic compound is oxidized and decomposed, and is also oxidized. After the oxidation and decomposition, the volatile organic compound is reduced by moisture, and the inorganic porous body carries the compound that returns to the original metal compound. Deodorant polyurethane foam, which is solidified after melting the surface of polyurethane foam made from polyurethane raw material containing odorant by heat melting treatment (flame treatment, etc.), oxidizes volatile organic compounds such as acetaldehyde. It can be seen that the deodorizing effect of decomposing is high and the deodorizing performance can be exhibited for a long time.

  On the other hand, from the acetaldehyde reduction results of Table 2 regarding the comparative examples, it can be seen that the aldehyde reduction effect cannot be obtained in Comparative Examples 1 and 2 in which no deodorant is added. In Comparative Example 2 in which flame treatment was performed without adding a deodorant, the aldehyde concentration increased after 23 hours, which is considered to be due to the decomposition of the organic compound by the heat during the flame treatment. However, the exact reason is unknown. Comparative Example 3 and Comparative Example 4 are examples containing a deodorant composed of molecular sieve, and Comparative Example 3 and Comparative Example 4 have an acetaldehyde reducing effect. Moreover, the comparative example 4 which performed the flame treatment had a higher effect of reducing acetaldehyde than the comparative example 3 which was not subjected to the flame treatment. However, in Comparative Example 3 and Comparative Example 4, after the measurement after 23 hours, the acetaldehyde concentration was increased by further heating at 80 ° C. for 2 hours. In Comparative Example 3 and Comparative Example 4, this is presumed to be because acetaldehyde was resorbed from the deodorant by heating because acetaldehyde was only physically adsorbed by the deodorant. In Comparative Example 5 and Comparative Example 6, the deodorant is an organic type, and the aldehyde reduction effect after 23 hours can be obtained as it is. However, even if flame treatment is performed, the aldehyde reduction effect does not increase and vice versa. The aldehyde concentration increased. This is presumed to be due to the fact that the deodorizing agent contained in Comparative Example 6 has lost its deodorizing function due to the heat of flame treatment. In addition, even if it heated at 80 degreeC for 2 hours after the measurement after 23 hours, the density | concentration of acetaldehyde hardly changed.

It is sectional drawing of the deodorizing polyurethane foam in one Example of this invention.

Explanation of symbols

10 Deodorant polyurethane foam 11 Polyurethane foam 12 Surface of polyurethane foam (surface subjected to heat melting treatment)
13 Surface of polyurethane foam (surface not heat-melted)

Claims (5)

In a polyurethane foam obtained by foaming a raw material containing polyols, polyisocyanates, foaming agent, catalyst and deodorant,
The deodorant is composed of an inorganic porous material supporting a metal compound, and the metal compound oxidizes and decomposes a volatile organic compound and is also oxidized, and is itself reduced by moisture after the oxidation and decomposition. Consisting of a compound that returns to the original metal compound,
The surface of the said polyurethane foam consists of what solidified after heat-melting, The deodorizing polyurethane foam characterized by the above-mentioned.   2. The deodorant polyurethane foam according to claim 1, wherein the heat melting of the polyurethane foam is performed by a flame treatment in which a surface of the polyurethane foam is blown with a flame.   The deodorant polyurethane foam according to claim 1 or 2, wherein the amount of the deodorizer is 5 to 40 parts by mass per 100 parts by mass of the polyol.   The deodorant polyurethane foam according to any one of claims 1 to 3, wherein the metal compound of the deodorizer is an iron compound or a silver compound.   The deodorant polyurethane foam according to any one of claims 1 to 4, wherein the volatile organic compound is an aldehyde.

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