JP2008303597A - Environment adaptive board-like heat insulator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an environment adaptive board-like heat insulator which is excellent in humidity conditioning properties, free from provision of an adhesive for retaining the shape, small in consolidation settlement, and good in ventilation performance. <P>SOLUTION: The environment adaptive board-like heat insulator 1 which is available by being filled in a wall, a ceiling, or an underfloor of a detached house or an apartment house, is prepared by using only wool 11 that is made of natural fibers excellent in humidity conditioning properties, and polylactic fibers 12, 13 having high biodegradability. Specifically the environment adaptive board-like heat insulator 1 is manufactured by preparing a nonwoven laminated body containing the wool of 50 to 80 wt.%, high-melting polylactic fibers having a melting point of not lower than 150°C, of 15 to 35 wt.%, and low-melting polylactic fibers having a melting point of not higher than 120°C, of 5 to 25 wt.%, and then subjecting the resultant nonwoven laminated body to heat seal treatment at a temperature of 130 to 140°C. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention belongs to the technical field of a board-like heat insulating material used by filling a wall, ceiling, under floor, etc. of a detached house or apartment.

  Conventionally, synthetic resin foams and inorganic fiber molded bodies are well known as board-like heat insulating materials for houses such as detached houses and apartments. Synthetic resin foams include beaded polystyrene foam (so-called styrofoam) and extrusion methods that are manufactured by adding foaming agents, flame retardants, etc. to polystyrene resins, and continuously extruding them and molding them into plates. Polyurethane foam, polyol and polyisocyanate, foaming agent, etc. are mixed, hard urethane foam manufactured by polymerizing and foaming in a short time, semi-manufactured by mixing foaming agent with polyethylene resin, etc. A highly foamed polyethylene foam, which is a hard heat insulating material, or a phenol foam made from a phenol resin synthesized by a reaction between phenol and formaldehyde is known.

  On the other hand, as an inorganic fiber molded body, silica sand, quartz stone, bitumen, feldspar, soda ash, etc. are melted at a high temperature to form a fiber, and a thermosetting adhesive is sprayed and pressure molded. Glass wool and rock wool that is formed into felt or matte shape by adding phenolic resin to a cotton-like material made by melting slag or basalt generated when iron is made in a blast furnace at a high temperature of 1500 to 1600 ° C. Are known.

Moreover, as described in Patent Document 1, synthetic fibers such as polyethylene terephthalate (PET), nylon, and acrylic are used as matrix fibers, and the matrix fibers are heat-sealed with low melting point composite fibers including PET. Synthetic fiber nonwoven fabric laminates that retain their form as board-like heat insulating materials have also been proposed as residential board-like heat insulating materials.
JP 2005-1382 (paragraphs 0018 and 0023)

  However, since all the heat insulating materials are generally inferior in terms of humidity control, internal condensation is likely to occur, and the possibility of generation of mold and termites increases with long-term use. Therefore, it is essential to install a moisture-proof sheet together with the heat insulating material. In addition, since inorganic fiber molded bodies such as glass wool and rock wool use an adhesive for imparting and maintaining the shape, attention must be paid to volatile chemical substances released from the adhesive. In addition, glass wool has a problem that the heat insulating property is partially lowered due to consolidation settlement. On the other hand, since the synthetic resin foam has poor air permeability, there is a possibility that the gas of the foaming agent or the gas of the resin raw material monomer trapped inside the foam gradually leaks into the room.

  The present invention addresses the above-mentioned problems in the conventional board-like heat insulating material, and is excellent in humidity control. As a result, it is not necessary to install a moisture-proof sheet together, and adhesion for imparting and maintaining the shape It is an object of the present invention to provide a board-like heat insulating material that does not require an agent and, as a result, does not need to worry about the release of volatile chemical substances, has low consolidation settlement, and has good air permeability.

  In order to solve the above-described problems, in the present invention, an environment-adaptive board-like heat insulating material was produced using only wool, which is a natural fiber excellent in moisture conditioning, and polylactic acid fiber having high biodegradability.

  That is, the invention according to claim 1 of the present application is an environment-adaptive board-like heat insulating material used by filling walls, ceilings, under floors, etc. of detached houses and apartments, wherein wool, high melting point polylactic acid are used. A nonwoven fabric laminate comprising fibers and a low melting point polylactic acid fiber is heat-bonded at a temperature lower than the melting point of the high melting point polylactic acid fiber and higher than the melting point of the low melting point polylactic acid fiber. And

  Next, the invention described in claim 2 of the present application is an environment-adaptive board-like heat insulating material that is also used by filling a wall, ceiling, under floor, etc. of a detached house or apartment, and has a wool melting point of 150. A nonwoven fabric laminate comprising a high melting point polylactic acid fiber having a melting point of 120 ° C. or higher and a low melting point polylactic acid fiber having a melting point of 120 ° C. or lower is heat-sealed at a temperature of 130 to 140 ° C. .

  Next, the invention according to claim 3 of the present application is the environment-adaptive board-like heat insulating material according to claim 1 or 2, wherein the wool is 50 to 80% by weight and the high melting point polylactic acid fiber is 15%. -35 wt%, low melting point polylactic acid fiber is contained in 5-25 wt%. Here, it goes without saying that the total amount is 100% by weight regardless of the combination of the three components by weight of wool, the high melting point type polylactic acid fiber and the low melting point type polylactic acid fiber.

  First, according to the invention described in claim 1, the environment-adaptive board-like heat insulating material is manufactured using only wool, which is a natural fiber excellent in humidity control, and polylactic acid fiber having high biodegradability. Therefore, this board-like heat insulating material is excellent in humidity control, and as a result, not only the moisture-proof sheet is not required to be applied at the time of construction, but also an adhesive for imparting and maintaining the shape is used. This eliminates the need to pay attention to the volatile chemicals released from the adhesive.

  In addition, the environment-adaptive board-like heat insulating material according to the present invention uses two types of polylactic acid fibers, a high melting point type and a low melting point type, which are lower than the melting point of the high melting point type polylactic acid fiber, and have a low melting point type. Because it is heat-sealed at a temperature higher than the melting point of polylactic acid fiber, wool and high-melting-point polylactic acid fiber that are not affected by heat-sealing treatment become matrix fibers, and melted by heat-sealing treatment. The polylactic acid fiber becomes a low-melting-point fiber for heat-sealing the matrix fibers, and as a result, the heat insulating material is favorably held in a board shape.

  The environment-adaptive board-like heat insulating material according to the present invention contains high melting point polylactic acid fiber, so that the rigidity is improved, and even after many years of use, the sag phenomenon is suppressed and consolidation settlement occurs. It becomes difficult. Moreover, since the environment-adaptive board-like heat insulating material according to the present invention is a nonwoven fabric laminate, it has excellent breathability, and no resin raw material monomer (for example, L-lactic acid) remains in the nonwoven fabric laminate. The inside of the heat insulating material is well scavenged. Furthermore, since wool has the effect | action which adsorb | sucks a volatile organic compound (VOC) and purifies air, the environment adaptive board-shaped heat insulating material which concerns on this invention is equipped with the function which cleans the air of a room. Become.

  Thus, the environment-adaptive board-like heat insulating material according to the present invention includes not only matrix fibers but also low-melting fibers for heat-sealing the matrix fibers to each other, and wool, which is a natural fiber, Since it was produced using only polylactic acid fiber having high biodegradability, when this environment-adaptive board-like heat insulating material is discarded, it does not adversely affect the global environment or the human body.

  Moreover, the polylactic acid fiber is produced by producing lactic acid by fermentation of starch or glucose obtained from corn or potatoes or sucrose obtained from beet or sugarcane, etc., and polymerizing this lactic acid to obtain polylactic acid. Therefore, it is possible to obtain only natural-derived materials as raw materials, which is not only biodegradable but also extremely safe.

  In that case, according to the invention described in claim 2, the melting point of the high melting point polylactic acid fiber is 150 ° C. or higher, the melting point of the low melting point polylactic acid fiber is 120 ° C. or lower, and the heat fusion treatment temperature of the nonwoven fabric laminate. Therefore, the environment-adaptive board-like heat insulating material according to the present invention is subjected to heat fusion treatment at a relatively low temperature, and as a result, the environment-adaptive board-like heat insulating material according to the present invention. Energy consumption for producing the material will be kept low.

  Here, when the melting point of the high melting point polylactic acid fiber is lower than 150 ° C., there arises a problem that the rigidity of the high melting point type polylactic acid fiber, and hence the rigidity of the board-like heat insulating material, is insufficient. On the other hand, when the melting point of the low melting point polylactic acid fiber exceeds 120 ° C., the heat fusion treatment temperature also increases accordingly. Although the upper limit value of the melting point of the high melting point polylactic acid fiber and the lower limit value of the melting point of the low melting point polylactic acid fiber are not defined in claim 2, generally, the upper limit value of the melting point of the high melting point type polylactic acid fiber is not specified. Is about 177 to 178 ° C., and the lower limit of the melting point of the low melting point polylactic acid fiber is about 100 ° C.

  In general, polylactic acid has two types of optical isomers, an L-form and a D-form, and consists of only one of them regardless of whether it is an L-form or a D-form. The homopolymer (ie, optical purity is 100%) has the highest melting point (177 to 178 ° C.), and in the copolymer containing both, the blending ratio of one is as small as 98 mol%, 94 mol%, 90 mol%, It is known that the melting point decreases as the other compounding ratio increases, for example, 2 mol%, 6 mol%, and 10 mol% (that is, as the optical purity decreases) (see, for example, Japanese Patent No. 3355026). ).

  As an example, the high melting point polylactic acid having a melting point of 150 ° C. or higher is L-form: D-form = 2 mol% or less: 98 mol% or more, or L-form: D-form = 98 mol% or more: 2 It can be obtained by making it a copolymer of mol% or less. Further, the low melting point polylactic acid having a melting point of 120 ° C. or less is L-form: D-form = 6 mol% or more: 94 mol% or less, or L-form: D-form = 94 mol% or less: 6 mol. % Or more of the copolymer. The L-form: D-form = 10 mol%: 90 mol%, or the L-form: D-form = 90 mol%: 10 mol% copolymer having a melting point of about 100 ° C., and the L-form: D -Form = 10 mol% or more: 90 mol% or less, or L-form: D-form = 90 mol% or less: When the copolymer is 10 mol% or more, polylactic acid becomes amorphous and does not exhibit a melting point. , Fiberization becomes difficult.

  Next, according to the invention described in claim 3, the environment-adaptive board-like heat insulating material is 50 to 80% by weight of wool, 15 to 35% by weight of high melting point polylactic acid fiber, and low melting point polylactic acid fiber. 5 to 25% by weight, moisture conditioning by wool, rigidity by high melting point polylactic acid fiber, and heat fusion property by low melting point polylactic acid fiber are expressed in a well-balanced manner.

  In that case, if the blending ratio of wool exceeds 80% by weight, the blending ratio of the high melting point polylactic acid fiber is reduced correspondingly, the rigidity of the board-like heat insulating material is excessively insufficient, and the sag phenomenon is likely to occur. Become. On the other hand, if the blending ratio of wool is less than 50% by weight, the humidity conditioning property of the board-like heat insulating material is excessively insufficient. On the other hand, when the blending ratio of the high melting point polylactic acid fiber exceeds 35% by weight, the rigidity of the board-like heat insulating material becomes excessively high, and the cutting work at the time of construction becomes difficult. On the other hand, if the blending ratio of the high melting point polylactic acid fiber is less than 15% by weight, the board-like heat insulating material has insufficient rigidity, and a sag phenomenon is likely to occur. On the other hand, when the blending ratio of the low melting point polylactic acid fiber exceeds 25% by weight, the fusion point between the wool and the high melting point type polylactic acid fiber is excessively increased, and the board-like heat insulating material contracts in the lamination direction of the nonwoven fabric. The thickness of the board-shaped heat insulating material becomes smaller than the target thickness. On the contrary, if the blending ratio of the low melting point polylactic acid fiber is less than 5% by weight, the fusion point between the wool and the high melting point polylactic acid fiber is excessively reduced, and the wool and the high melting point poly Lactic acid fibers are easily loosened, and the shape retainability of the board-like heat insulating material is lowered.

  Hereinafter, the present invention will be described in more detail through the best mode and examples of the present invention.

  FIG. 1 is a perspective view of an environment-adaptive board-like heat insulating material 1 according to this embodiment. The environment-adaptive board-like heat insulating material 1 includes a nonwoven fabric laminate including wool 11 which is a natural fiber excellent in humidity control and polylactic acid fibers 12 and 13 having high biodegradability. It is molded into a board shape by heat-sealing treatment at a temperature lower than the melting point of the low-melting-type polylactic acid fiber 13 and used to fill the walls, ceilings, and under floors of detached houses and apartments. Is done. The raw materials are wool 11, high melting point polylactic acid fiber 12, and low melting point polylactic acid fiber 13, where wool 11 and high melting point polylactic acid fiber 12 are matrix fibers, and low melting point polylactic acid fiber 13 is It is a low melting point fiber for thermally fusing the matrix fibers 11 and 12 together.

  As the wool 11, for example, a non-wool product produced in pastoral operations such as Australia and New Zealand can be preferably used. Polylactic acid fibers 12 and 13 produce lactic acid by fermentation of starch or glucose obtained from corn or potato as agricultural crops, or sucrose obtained from beet or sugarcane, etc., and polymerize this lactic acid to produce polylactic acid Then, a fiberized product can be preferably used. When lactic acid is produced by such a fermentation method, among the optical isomers, L-lactic acid that exists in nature is obtained, but artificially synthesized D-lactic acid can also be preferably used. However, from the viewpoint of biodegradability of the polylactic acid fiber, it is preferable to use a large amount of L-lactic acid.

  The wool 11 contributes to the humidity control property of the board-like heat insulating material 1 and also contributes to the heat insulating property, air permeability, sound absorbing property, etc. of the board-like heat insulating material 1. On the other hand, the high melting point type polylactic acid fiber 12 has a function of increasing the rigidity of the board-shaped heat insulating material 1 mainly composed of wool 11 because of its high rigidity. Further, since the low melting point polylactic acid fiber 13 has a low melting point, the board-like heat insulating material 1 is obtained by partially heat-sealing the blend of the wool 11 and the high melting point type polylactic acid fiber 12 in a heat-sealing process. Exhibits the function of maintaining the shape of

  Here, from the viewpoint of reducing the energy consumption for producing the board-shaped heat insulating material 1, the heat-sealing treatment temperature is preferably 130 to 140 ° C. For that purpose, the melting point of the high melting point polylactic acid fiber 12 is 150. The melting point of the low melting point polylactic acid fiber 13 is preferably 120 ° C. or lower. If the heat sealing temperature exceeds 140 ° C., the energy consumption for producing the board-like heat insulating material 1 becomes excessively high, leading to an increase in environmental load and an increase in cost. On the other hand, when the heat fusion treatment temperature is lower than 130 ° C., the melting point of the low melting point polylactic acid fiber 13 must be lowered accordingly, and the crystallinity of the low melting point type polylactic acid fiber 13 is lowered (non- The fiberization becomes unstable (approaching crystallinity). On the other hand, from the viewpoint of the high melting point polylactic acid fiber 12, when the melting point is lower than 150 ° C., there arises a problem that the rigidity of the high melting point polylactic acid fiber 12, and hence the rigidity of the board-like heat insulating material 1, is insufficient. Further, from the viewpoint of the low melting point type polylactic acid fiber 13, when the melting point exceeds 120 ° C., the heat fusion treatment temperature increases accordingly, and the energy consumption for producing the board-shaped heat insulating material 1 increases. End up.

  Since the environment-adaptive board-like heat insulating material 1 according to the present embodiment is produced using only the wool 11 which is a natural fiber excellent in humidity control and the polylactic acid fibers 12 and 13 having high biodegradability. As shown in FIG. 2, this board-like heat insulating material 1 is excellent in humidity control. As a result, not only the moisture-proof sheet is not required to be applied at the time of construction, but also for imparting and maintaining the shape. Since no adhesive is used, there is no need to pay attention to the volatile chemicals released from the adhesive.

  In addition, the environment-adaptive board-like heat insulating material 1 according to the present embodiment uses two types of polylactic acid fibers 12 and 13 of a high melting point type and a low melting point type, and the melting point of the high melting point type polylactic acid fiber 12. Since the heat fusion treatment is performed at a lower temperature than the melting point of the low melting point polylactic acid fiber 13, the wool 11 and the high melting point polylactic acid fiber 12 that are not affected by the heat fusion treatment become matrix fibers, and heat The low melting point polylactic acid fiber 13 melted by the fusion process becomes a low melting point fiber for thermally fusing the matrix fibers 11 and 12 together, and as a result, the heat insulating material 1 is well held in a board shape. It becomes.

  And the environment-adaptive board-shaped heat insulating material 1 which concerns on this embodiment improves rigidity by containing the high melting point type | mold polylactic acid fiber 12, and even if used for many years, a sag phenomenon is suppressed, and it is consolidated. Settlement is less likely to occur. Moreover, since the environment-adaptive board-shaped heat insulating material 1 which concerns on this embodiment is a nonwoven fabric laminated body, as shown in FIG. 2, it is excellent in air permeability and resin raw material monomer (for example, L-lactic acid) inside a nonwoven fabric laminated body. Does not remain, and the inside of the board-shaped heat insulating material 1 is well scavenged. Furthermore, since the wool 11 has the effect | action which adsorb | sucks a volatile organic compound (VOC) and purifies air, the environment adaptive board-shaped heat insulating material 1 which concerns on this embodiment has the function to clean the air of a room. Will be prepared.

  The environment-adaptive board-like heat insulating material 1 according to the present embodiment is not only a matrix fiber but also a wool 11 in which all materials are natural fibers, including a low melting point fiber for heat-sealing matrix fibers to each other. Since it is produced using only the polylactic acid fibers 12 and 13 having biodegradability, when the environment-adaptive board-like heat insulating material 1 is discarded, it does not adversely affect the global environment or the human body. . Moreover, since the polylactic acid fibers 12 and 13 can be produced using only naturally-derived materials as raw materials by fermentation, they are not only biodegradable but also extremely safe. Therefore, the environment-adaptive board-like heat insulating material 1 according to the present embodiment realizes an unprecedented safe, comfortable and healthy living space, and from its manufacture to storage, distribution, construction, disposal From time to time, it is always safe for the global environment and the human body.

  Here, in the environment-adaptive board-like heat insulating material 1 according to the present embodiment, the blending ratio of the wool 11, the high melting point polylactic acid fiber 12, and the low melting point polylactic acid fiber 13 is 50 to 80 wt. %, The high melting point polylactic acid fiber is preferably 15 to 35% by weight, and the low melting point polylactic acid fiber is preferably 5 to 25% by weight. In particular, the blending ratio of the wool 11 is most preferably 60% by weight in order to ensure sufficient heat insulation, humidity control, air permeability, and the like as the heat insulating material 1.

  When the blending ratio of the wool 11 exceeds 80% by weight, the blending ratio of the high melting point type polylactic acid fiber 12 is excessively decreased, the rigidity of the board-shaped heat insulating material 1 is lowered, and the sag phenomenon is likely to occur. The workability becomes poor. On the other hand, when the blending ratio of the wool 11 is less than 50% by weight, the moisture conditioning property, heat insulating property, air permeability and sound absorbing property of the board-like heat insulating material 1 are insufficient.

  If the blending ratio of the high melting point polylactic acid fiber 12 exceeds 35% by weight, the rigidity of the board-like heat insulating material 1 becomes too high, and the cutting work at the time of construction becomes difficult. On the contrary, if the blending ratio of the high melting point polylactic acid fiber 12 is less than 15% by weight, the rigidity of the board-shaped heat insulating material 1 becomes too low, and a tendency to sag when the board-shaped heat insulating material 1 is erected. Becomes larger.

  When the blending ratio of the low melting point polylactic acid fiber 13 exceeds 25% by weight, the fusing point between the wool 11 and the high melting point type polylactic acid fiber 12 increases so that the board-like heat insulating material 1 contracts in the lamination direction of the nonwoven fabric. And the thickness of the board-shaped heat insulating material 1 will become smaller than the target thickness. On the contrary, when the blending ratio of the low melting point polylactic acid fiber 13 is less than 5% by weight, the fusing point between the wool 11 and the high melting point type polylactic acid fiber 12 is excessively reduced, and the board-like heat insulating material 1 is exposed from the outside. When the physical force is repeatedly applied, the fused wool 11 and the high melting point polylactic acid fibers 12 are easily loosened, and the shape of the board-like heat insulating material 1 is not maintained.

  Next, with reference to FIG. 3, the manufacturing process of the environment adaptive board-shaped heat insulating material 1 which concerns on this embodiment is demonstrated. First, as indicated by reference numeral (a), the opened wool 11, the high melting point polylactic acid fiber 12, and the low melting point polylactic acid fiber 13 are weighed by a necessary amount. Next, as indicated by reference symbol (a), these three types of fibers 11, 12, and 13 are put into a vertical hopper and mixed well. Next, as indicated by reference numeral (c), for example, a web is formed by a dry card method to produce a nonwoven fabric. Next, as indicated by reference numeral (d), a nonwoven fabric laminate having a thickness required by, for example, a cross layer is produced. Subsequently, as shown by a code | symbol (e), the produced nonwoven fabric laminated body is mounted in a conveyor. The thickness of the nonwoven fabric laminate before the heat sealing treatment is, for example, 120 mm. Next, as indicated by reference numeral (f), the nonwoven fabric laminate is passed through an oven and subjected to heat fusion treatment at a temperature of 135 ° C. using, for example, far infrared rays. And as shown with a code | symbol (ki), after passing oven, the nonwoven fabric laminated body to which the heat-fusion process was performed is applied to a roller, and it finally adjusts to the target thickness. The thickness of the nonwoven fabric laminate after the heat sealing treatment is, for example, 45 to 60 mm.

  Merino wool with a thickness of 0.018 to 0.023 mm and a length of 5 to 10 cm; and a high melting point polylactic acid fiber with a thickness of 0.010 to 0.030 mm and a length of 3 to 7 cm (melting point : 150 to 178 ° C.) and low melting point polylactic acid fibers (melting point: 100 to 120 ° C.) having a thickness of 0.010 to 0.030 mm and a length of 3 to 7 cm. 4, blended at the blending ratio (% by weight) shown in FIG. 4 and formed into a nonwoven fabric by web-drying using the dry card method, and this was laminated to a thickness of 120 mm by a cross layer, and then heat-sealed at a temperature of 135 ° C. with far infrared rays The environment-adapted board-like heat insulating material according to the present invention (length: 910 mm, width), in which a blend of wool and high-melting-type polylactic acid fibers is partially heat-sealed with low-melting-type polylactic acid fibers 260 mm, thickness 60 mm) Examples 1-6). Further, as Comparative Examples 1 to 3, board-like heat insulating materials were produced according to the above with only wool and high-melting-point polylactic acid fibers without using low-melting-point polylactic acid fibers. About each obtained board-shaped heat insulating material, each performance test of heat insulation, humidity control, air permeability, sag resistance, meltability, and a cutting property was done. The results are also shown in FIG.

  In that case, heat insulation measured thermal conductivity (W / m * K) according to JIS A1412 (The measuring method of the thermal conductivity and thermal resistance of a thermal insulator). Evaluation criteria are “◯” (excellent) for thermal conductivity of 0.030 to 0.045 W / m · K, and “△” (slightly inferior) for 0.046 to 0.090 W / m · K. ,> 0.090 W / m · K was designated as “x” (inferior).

  Moreover, humidity control measured moisture absorption (%) and moisture release (%) according to building material test center standard JSTM H6302 (humidity-adjusting building material moisture absorption / release test method). The evaluation criteria are “◯” (excellent) when moisture absorption is 6.0% ≦ and moisture release is 4.5% ≦, moisture absorption is 1.0 to 5.9%, and moisture release is 0.5 to 4. 4% of the samples were evaluated as “Δ” (slightly inferior), moisture absorption was <1.0%, and moisture release was <0.5% as “x” (inferior).

  In addition, air permeability (simple test) is a state where one opening of a pipe having an inner diameter of 1 cm and a length of 10 cm is brought into contact with one surface of the board-like heat insulating material, and a breath is blown from the other opening, It was confirmed whether breath leaked from the other side of the board-like insulation. The evaluation criteria are “○” (excellent) for breathing, “△” (slightly inferior) for breathing slightly, and “X” (inferior) for breathing out. .

  In addition, with respect to sag resistance (simple test), a board-like heat insulating material having a size of 910 mm × 260 mm × 60 mm was set up so that the longitudinal direction was vertical, and the sag phenomenon of the board over time was observed. Evaluation criteria are “○” (excellent) for those with no sagging phenomenon, “△” (slightly inferior) for those with slight sagging phenomenon, and “×” (inferior) for those with noticeable sagging phenomenon. It was.

  Further, for the fusing property (simple test), the board-like heat insulating material was pulled with both hands in the longitudinal direction and the width direction, and the degree of fixation by fusing fibers or the degree of deformation of the board was observed. The evaluation criteria are “○” (excellent) when the board is not deformed, “△” (slightly inferior) when the board is slightly deformed, and “X” (inferior) when the board is significantly deformed and elongated. did.

  And the cutting property (simple test) confirmed whether a board-shaped heat insulating material could be easily cut | disconnected with the scissors with a long blade edge | tip. The evaluation criteria were “◯” (excellent) for those that can be easily cut, “Δ” (slightly inferior) for those that have some resistance but can be cut, and “x” (poor) for those that are difficult to cut.

  As is clear from FIG. 4, all of Examples 1 to 6 using the low melting point polylactic acid fiber as the low melting point fiber for thermally fusing the wool and the matrix fiber of the high and low melting point polylactic acid fiber, Excellent heat insulation, humidity control, air permeability, and sag resistance, which are required for board-like heat insulation materials, as well as fusion properties to maintain the shape of the heat insulation materials and easy work during construction It was also a favorable result in terms of cutting ability.

  On the other hand, Comparative Examples 1 to 3 in which the low melting point type polylactic acid fiber was not used were all inferior in fusibility. In addition, in Comparative Examples 1 and 2, in which the blending ratio of the high-melting-point polylactic acid fiber having a large rigidity is excessively large because the low-melting-point polylactic acid fiber is not included, the cutting performance is poor. there were.

  As described above in detail with specific examples, the present invention is excellent in humidity control, and as a result, it is not necessary to apply a moisture-proof sheet together, and an adhesive for imparting and maintaining the shape is unnecessary, As a result, there is no need to worry about the release of volatile chemical substances, and it is a technology that can provide an environment-adaptive board-like heat insulating material that has less sag and compaction settlement and good air permeability. In the technical field of board-like heat insulating materials used by filling walls, ceilings, and floors of houses such as detached houses and condominiums, a wide range of industrial applicability is expected.

It is a perspective view of the environment-adaptive board-shaped heat insulating material which concerns on the best embodiment of this invention. It is a table | surface which compares and shows the main performance of the environmental adaptation type board-shaped heat insulating material which concerns on this invention, and the conventional board-shaped heat insulating material. It is explanatory drawing of the manufacturing process of the environment adaptation type board-shaped heat insulating material which concerns on best embodiment of this invention. It is a table | surface which shows the mixture ratio and the performance test result of the Example and comparative example of an environmental adaptation type board-shaped heat insulating material which concern on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Environment-adaptive board-shaped heat insulating material 11 Wool 12 High melting point type polylactic acid fiber 13 Low melting point type polylactic acid fiber

Claims (3)

  Non-woven fabric laminate comprising wool, high melting point polylactic acid fiber, and low melting point polylactic acid fiber is heat-melted at a temperature lower than the melting point of high melting point polylactic acid fiber and higher than the melting point of low melting point polylactic acid fiber. An environmentally-adapted board-like heat insulating material, characterized by being subjected to a wearing process.   A non-woven fabric laminate comprising wool, a high melting point polylactic acid fiber having a melting point of 150 ° C. or higher, and a low melting point polylactic acid fiber having a melting point of 120 ° C. or lower is heat-sealed at a temperature of 130 to 140 ° C. An environmentally adaptable board-like heat insulating material. The environment-adaptive board-like heat insulating material according to claim 1 or 2,
An environment-adaptive board-like heat insulating material comprising 50 to 80% by weight of wool, 15 to 35% by weight of high melting point polylactic acid fiber, and 5 to 25% by weight of low melting point polylactic acid fiber.

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