JP2001294640A - Heat-accumulating mechanical froth type polyurethane foam and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a heat-accumulating mechanical froth type polyurethane foam capable of preventing to become stuffy in the use of bedding, wear, or the like, by imparting a mechanical froth type polyurethane foam with heat- accumulating property and having a temperature-controlling function in the use as a shock-absorbing packaging material for precision OA equipments, or the like. SOLUTION: Microcapsules containing a latent heat-accumulation agent in the shells are dispersed in a mechanical froth type polyurethane foam. The latent heat-accumulation agent has a phase-transition temperature at 0-110 deg.C or thereabout.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage mechanical floss type polyurethane foam suitable for use in covers such as pillows and mattresses, shoe insoles, shock absorbing packing materials for OA equipment, etc., and winter clothing. More particularly, the present invention relates to a heat storage mechanical floss type polyurethane foam obtained by imparting heat storage properties to a mechanical floss type polyurethane foam to enhance its functionality, and a method for producing the same.

[0002]

2. Description of the Related Art A mechanical froth type polyurethane foam which forms a foam by mechanically entraining air without using a foaming agent as a raw material of urethane foam has a low residual compression set, and is excellent in air sealability and energy absorption. It is used for a wide range of applications as various cushioning materials, packing materials, cover materials and the like.

[0003]

However, due to its excellent air-sealing properties (low air permeability), the mechanical floss type polyurethane foam is used for touching the human body, for example, covering materials for pillows and mattresses, insoles for shoes, When applied to clothing or the like, "humidity" may occur, and a comfortable feeling of use may not be obtained.

When used as a shock absorbing packing material for precision OA equipment or the like, there is a case where a temperature control function for keeping the temperature constant with respect to a change in the outside air temperature is required in terms of an internal protection effect. However, although the mechanical floss type polyurethane foam has a certain degree of heat insulation, such a temperature control function cannot be obtained.

[0005] The present invention solves the above-mentioned conventional problems, and by imparting heat storage properties to a mechanical floss type polyurethane foam, it is possible to prevent stuffiness in applications such as bedding and clothing, and to provide precision OA equipment and the like. It is an object of the present invention to provide a heat storage mechanical floss type polyurethane foam provided with a temperature control function in the use of a shock absorbing packaging material.

[0006]

Means for Solving the Problems The heat-storable mechanical floss type polyurethane foam of the present invention is characterized in that heat-storable particles are blended in the mechanical floss type polyurethane foam.

The heat storage particles have a relatively large heat absorption capacity, and the heat storage particles are dispersed in a mechanical floss type polyurethane foam to obtain a soft heat storage mechanical floss type polyurethane foam having a relatively large heat absorption capacity.

As the heat storage particles, microcapsules containing a latent heat storage agent in a shell are preferable. The latent heat storage agent usually exhibits a heat absorbing effect or a heat releasing effect by utilizing a liquid-solid phase change, and has a relatively large heat absorbing capacity. When a latent heat storage agent of a material that changes phase at 0 to 110 ° C is used, it can be used as a cover material for pillows and mattresses, for insoles in shoes, for touching the human body such as clothing, and as a shock absorbing packaging material for precision OA equipment. A suitable heat storage mechanical floss type polyurethane foam is obtained.

The amount of the heat storage particles dispersed is preferably 25 to 80% by weight, and the particle diameter of the heat storage particles is preferably 1 to 500 μm.

[0010] The heat-storing mechanical froth-type polyurethane foam of the present invention comprises a urethane foam raw material such as a polyol component, an isocyanate component, and a catalyst and heat-storing particles according to the method for producing the heat-storing mechanical floss-type polyurethane foam of the present invention. Can be easily manufactured by stirring while blowing air.

[0011]

Embodiments of the present invention will be described below in detail.

First, the heat storage particles used in the heat storage mechanical floss type polyurethane foam of the present invention will be described.

As described above, the heat storage particles are preferably microcapsules in which a latent heat storage agent is encapsulated in a shell.

As the latent heat storage agent, one having an appropriate melting point may be selected depending on the use of the heat storage mechanical froth type polyurethane foam. For example, paraffinic hydrocarbons, natural wax, petroleum wax, polyethylene glycol, hydrates of inorganic compounds and the like can be used.

When the heat storage mechanical floss type polyurethane foam of the present invention is used for clothing,
The material is selected to have a solid-liquid phase transition temperature at a temperature slightly below body temperature, for example, in the range of about 10-35 ° C, especially around 28 ° C. In addition, materials having a solid-liquid phase transition temperature at room temperature of this level are also suitable for use as packaging materials for shock absorption such as precision OA equipment, sound absorbing materials, and vibration damping materials. Materials having a solid-liquid phase transition temperature in a wide range of 110 ° C. can be selected and used. Examples of this material include hexadecane (melting point: 18 ° C.), octadecane (melting point: 25 ° C.), nonadecane (melting point: 32 ° C.), tetracholan (melting point: 51 ° C.), octacosan (melting point: 61 ° C.), and the like.

The material of the shell is a material whose heat-resistant temperature is sufficiently higher than the melting point of the latent heat type heat storage agent, for example, 30 ° C. or higher, preferably 50 ° C. or higher, and is a heat storage mechanical floss type polyurethane. A material having strength according to the use of the foam may be appropriately selected. For example, melamine resin, acrylic resin, urethane resin and the like can be mentioned. Among them, a particularly preferred material is polyoxymethylene urea.

The preferred outer diameter of the microcapsules is 1 to 5
It is 00 μm, and more preferably 5 to 100 μm. It is preferable that the amount of the latent heat storage agent included is large from the viewpoint of the latent heat effect. However, if the amount is too large, the microcapsules may be damaged due to a change in the volume of the latent heat storage agent. For this reason, the amount of the latent heat storage agent with respect to the total weight of the microcapsules is preferably 30 to 90% by weight, and more preferably 60 to 80% by weight.

As a method for producing the microcapsules, an appropriate method can be selected from conventionally known methods such as an interfacial polymerization method, an in-situ polymerization method, and a coacervate method, depending on the materials of the latent heat storage agent and the shell. I just need.

The microcapsules are preferably contained in an amount of 25 to 80% by weight based on the total weight of the heat storage mechanical froth type polyurethane foam, and 30 to 30% by weight.
More preferably, it is 60% by weight. If the content of the microcapsules is less than 25% by weight, the heat storage effect may be insufficient. 80% by weight microcapsules
Exceeding the range is not preferred because the intrinsic properties of the heat storage mechanical floss type polyurethane foam such as residual compression set, air sealability, and energy absorption are impaired.

Such a mechanical froth type polyurethane foam in which the microcapsules are dispersed can be produced by mixing the microcapsules with urethane foam raw materials such as a polyol component, an isocyanate component, and a catalyst, and then blowing air with stirring. it can.
The method of molding the foaming raw material is not particularly limited. However, when a sheet-shaped mechanical froth type polyurethane foam is produced, it may be molded by flowing out by a doctor blade method or the like.

The polyol component of the raw material of the mechanical froth type polyurethane foam has a molecular weight of 2,000 to 2,000.
High molecular weight polyol of about 7000 and molecular weight of 30 to 10
A low molecular weight polyol of about 00 is preferably used in combination, and a low molecular weight polyol of 0 to 50 parts by weight is particularly preferably used in combination with 100 parts by weight of a high molecular weight polyol.

Examples of high molecular weight polyols include polyether polyols, polyester polyols, castor oils,
And other polyols.

Specific examples of polyether polyols include polypropylene glycol, polytetramethylene glycol, and PO adducts of polyhydric alcohols such as glycerin, pentaerythritol, sorbitol, and sucrose.

Examples of the polyester polyol include a condensed polyester polyol from a polycarboxylic acid and a polyol, and a lactone polyester polyol obtained by lactone ring-opening polymerization. Specific examples of the condensed polyester polyol include poly (1,4-butanediol adipate), poly (1,4-butanediol terephthalate), and poly (diethylene glycol) terephthalate.

Specific examples of the lactone polyester polyol include poly ε-caprolactone polyol.

Examples of castor oils include castor oil, hardened castor oil, and low molar (1 to 3 mol) alkylene oxide (EO, PO, etc.) adducts thereof, preferably castor oil.

Other polyols include polybutadiene polyols, hydroxyl-containing vinyl polymers, polymer polyols modified with ethylenically unsaturated monomers, and the like.

Preferred among the high molecular weight polyols are polyether polyols and castor oil, the preferred hydroxyl number of which is usually from 20 to 250.

Examples of the low molecular weight polyol include polyhydric alcohols such as 1,4-butanediol glycerin, trimethylolpropane, pentaerythritol, methylglycoside, diglycerin, sorbitol, sucrose and the like, and alkylene oxide adducts thereof (usually 1 to
10 mol) and amino alcohols.

On the other hand, as the isocyanate component, toluene diisocyanate (TDI) or diphenylmethane diisocyanate (M
DI) or modified MDI, xylylene diisocyanate (XDI), isophorone diisocyanate (IPD)
I), hexamethylene diisocyanate (HMDI) Prepolymers of these isocyanates, carbodiimide-modified types and the like are mainly used. Further, a mixture of crude MDI and TDI can be used. The isocyanate component preferably uses an isocyanate index of 80 to 130. As the catalyst, a metal catalyst such as stannas octoate is mainly used, and an amine-based catalyst may be used in combination. The amount of the catalyst is preferably 0.01 to 5.0 parts by weight based on 100 parts by weight of the polyol component.

As the urethane foam raw material, besides the above-mentioned various components, a foam stabilizer and various additives can be blended if necessary. Examples of such additives include flame retardants, colorants, antioxidants, ultraviolet absorbers and the like that are usually used for producing urethane foam. The amounts of these additives and the like may be set to such an extent that the properties of the obtained heat storage type mechanical froth type polyurethane foam are not impaired.

In order to enhance the mechanical froth foaming property, a dehydrating agent may be added.

The blowing of air for foaming the mechanical floss can be performed by blowing air into the urethane foam raw material with stirring using an Oaks mixer, a Hobart mixer, or the like. The stirring time is determined according to the density of the obtained foam and the like, but is usually 3000 to 7000 mL / mi.
What is necessary is just to perform at 500-3000 rpm with the air blowing amount of n.

The heat storage type mechanical froth type polyurethane foam of the present invention generally has a density of 40 kg / m ³ or more, preferably 50 kg / m ³ or more.

[0035]

The present invention will be described more specifically below with reference to examples and comparative examples.

Example 1 A heat-storing mechanical froth type polyurethane foam was manufactured using THERMASORB83 (trade name) manufactured by Frisby Technologies. This microcapsule has a latent heat storage agent having a melting point of 28 ° C. encapsulated in a shell made of polyoxymethylene urea at 75% by weight based on the total weight of the microcapsule, and has an average particle size of 28 μm.

The urethane foam raw materials were blended as shown in Table 1. All the raw materials were mixed and simultaneously stirred at 1000 rpm while blowing 4000 mL of air per minute at a flow rate of 1.5 kg / min of the high molecular polyol.

After that, pour out with a doctor blade,
A sheet having a thickness of 5 mm was prepared, and the obtained heat storage mechanical floss type polyurethane foam was examined for temperature change characteristics and the density was measured by the following method.
The results are shown in Table 1.

[Temperature change characteristic test method] The sheet is folded in two, a thermocouple is interposed between the sheets, the sheet is left in a 20 ° C atmosphere for 2 hours, then kept in a 30 ° C atmosphere for 3 hours, and then kept in a 20 ° C atmosphere again. did. Then, the time required for the detected temperature of the thermocouple to reach the equilibrium temperature of 20 ° C. to 30 ° C. and the time required for the thermocouple to reach the equilibrium temperature of 30 ° C. to 20 ° C. were measured.

Comparative Example 1 A mechanical floss type polyurethane foam was produced in the same manner as in Example 1 except that the heat storage particles were not used and the raw materials shown in Table 1 were used, and the temperature of the obtained mechanical floss type polyurethane foam was measured. The change characteristics and density were examined, and the results are shown in Table 1.

[0041]

[Table 1]

As is clear from Table 1, it takes a long time to increase the temperature from 20.degree. C. to 30.degree. C. and to decrease the temperature from 30.degree. C. to 20.degree. .

That is, the heat storage mechanical floss type polyurethane foam of Example 1 is mixed with heat storage particles which cause a liquid-solid phase change at around 28 ° C.
At around 8 ° C., thermal energy is absorbed and released, and at around this temperature, it does not easily follow the ambient temperature. For this reason, it is possible to prevent the temperature from rising when it comes into contact with the human body to prevent stuffiness, and also to prevent abnormal heat generation for the OA equipment.

Further, since the effect of maintaining the temperature can be obtained not only when the temperature rises but also when the temperature falls, excellent characteristics can be obtained even for use in winter clothing.

[0045]

As described above, according to the present invention, the heat storage property is imparted to the mechanical floss type polyurethane foam without impairing the excellent characteristics of the mechanical floss type polyurethane foam, so that the stuffiness in applications such as bedding and clothing can be obtained. Can be prevented, and precision O
Provided is a heat storage mechanical floss type polyurethane foam provided with a temperature control function for use in packaging materials for shock absorption such as A equipment.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09K 5/08 C09K 5/06 Z 5/06 (C08G 18 / 00F // (C08G 18/00 101: 00) 101: 00) C09K 5/00 EF term (reference) 3B096 AC14 AD07 AD08 3E066 CA01 CB01 DA01 LA30 4J002 AE032 CH022 CK021 EA016 FA092 FA096 FD202 FD206 GC00 4J034 CA03 CB03 CB04 CB05 CC45 CC52 CC37 CC52 CC37 CD01 CD04 DA01 DB04 DB05 DB07 DF12 DF14 DG04 DG06 DQ02 DQ12 GA06 HA01 HA07 HC03 HC12 HC17 HC46 HC52 HC61 HC64 HC67 HC71 HC73 JA01 JA14 JA20 MA29 NA09 QC01 QC04 RA03

Claims (7)

[Claims] 1. A heat storage type mechanical foam type polyurethane foam comprising heat storage particles in a mechanical foam type polyurethane foam. 2. The heat storage mechanical floss type polyurethane foam according to claim 1, wherein the heat storage particles are microcapsules having a latent heat storage agent encapsulated in a shell. 3. The latent heat storage agent according to claim 2, wherein the latent heat storage agent is a liquid.
A heat storage mechanical floss type polyurethane foam, which generates a solid phase change. 4. The method according to claim 3, wherein the phase change is from 0 to 110.
A heat storage mechanical floss type polyurethane foam, which is generated at a temperature of ℃. 5. The heat-storing mechanical froth type polyurethane foam according to claim 1, wherein the heat-storing particles are dispersed in an amount of 25 to 80% by weight. 6. The heat storage mechanical floss type polyurethane foam according to claim 1, wherein the heat storage particles have a particle size of 1 to 500 μm. 7. A polyol component, an isocyanate component,
7. A heat storage mechanical froth type polyurethane foam according to any one of claims 1 to 6, wherein after mixing urethane foam raw materials such as a catalyst and heat storage particles, the mixture is stirred while blowing air. A method for producing a heat-storing mechanical floss type polyurethane foam.