JP2004352752A - Ceiling material for automobile - Google Patents

Ceiling material for automobile Download PDF

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Publication number
JP2004352752A
JP2004352752A JP2003148834A JP2003148834A JP2004352752A JP 2004352752 A JP2004352752 A JP 2004352752A JP 2003148834 A JP2003148834 A JP 2003148834A JP 2003148834 A JP2003148834 A JP 2003148834A JP 2004352752 A JP2004352752 A JP 2004352752A
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JP
Japan
Prior art keywords
crosslinked foam
ceiling material
polylactic acid
biodegradable
resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2003148834A
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Japanese (ja)
Inventor
Atsushi Goto
Yoshiyuki Oka
Junichi Tainaka
善之 岡
淳 後藤
純一 田井中
Original Assignee
Toray Ind Inc
東レ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toray Ind Inc, 東レ株式会社 filed Critical Toray Ind Inc
Priority to JP2003148834A priority Critical patent/JP2004352752A/en
Publication of JP2004352752A publication Critical patent/JP2004352752A/en
Application status is Pending legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a ceiling material for an automobile which eliminates environmental load on disposal, and is lightweight and excellent in rigidity, dimensional stability and moldability. <P>SOLUTION: The ceiling material for the automobile is provided with a crosslinked foam composed of a biodegradable resin, and the crosslinked foam has a maximum flexural load of at least 1.0 N. Preferably, the ceiling material is composed of the crosslinked foam obtained using a biodegradable polyester resin comprising 90-10 pts. wt. of polylactic acid having a d-isomer/l-isomer molar ratio (d/l) of 98/2-70/30 or 2/98-30/70 and 10-90 pts. wt. of a biodegradable polyester resin other than the polylactic acid, a thermodecomposable blowing agent and an auxiliary crosslinking agent. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to ceiling materials for automobiles. More specifically, the present invention relates to a ceiling material for an automobile, comprising a crosslinked foam made of a biodegradable resin, wherein the crosslinked foam has a predetermined maximum bending load.
[0002]
[Prior art]
The ceiling material for automobiles is generally formed by laminating a glass fiber layer on both sides of a foam base material made of polyurethane foam or the like, and a face material is laminated on the glass fiber layers on both sides, and each member is bonded and integrated. In this case, one of the surface materials is a front surface material and the other is a back surface material (for example, see Patent Document 1). Since glass fibers are used, recyclability and workability are poor, and polyurethane foams have problems such as the possibility of generating cyan gas or the like during combustion.
[0003]
Therefore, it has been proposed to resolve the disposal problem associated with the use of a resin as described above, and to use a biodegradable resin to dispose the resin without causing an environmental problem to make it an interior part (for example, see Patent Document 2). ). However, in order to solve the problem of disposing of ceiling materials for automobiles, it is necessary to eliminate inorganic fiber layers, and simply replacing them with biodegradable resins currently on the market is insufficient in rigidity. There were problems such as deformation and poor moldability due to severe temperature changes in the room, and they were not always satisfactory as automotive ceiling materials.
[0004]
[Patent Document 1]
JP-A-2002-46545 (paragraphs [0002] to [0003])
[0005]
[Patent Document 2]
JP-A-2003-9994 (paragraphs [0001] to [0012])
[0006]
[Problems to be solved by the invention]
It is an object of the present invention to provide an automotive ceiling material that eliminates the environmental burden at the time of disposal, which is a problem of conventional automotive ceiling materials, and that is lightweight and has excellent rigidity, dimensional stability, and moldability. And
[0007]
[Means for Solving the Problems]
In order to solve such a problem, the present invention has the following configuration. That is, the present invention
(1) An automotive ceiling material comprising a crosslinked foam made of a biodegradable resin, wherein the maximum bending load of the crosslinked foam is 1.0 N or more.
[0008]
(2) The automotive ceiling material according to (1), wherein the crosslinked foam is a crosslinked foam using polylactic acid, a pyrolytic foaming agent, and a crosslinking aid.
[0009]
(3) The polylactic acid is characterized in that the molar ratio between the d-form and the l-form is d / l = 98/2 to 70/30 or d / l = 2/98 to 30/70 (2). The ceiling material for automobiles according to 1.
[0010]
(4) The crosslinked foam is a crosslinked foam using 90 to 10 parts by weight of polylactic acid and 10 to 90 parts by weight of a biodegradable polyester resin other than polylactic acid. The ceiling material for an automobile according to any one of (3).
[0011]
(5) The biodegradable polyester resin other than the polylactic acid is at least one selected from a lactone resin, an aliphatic polyester, an aromatic copolymerized polyester, and a natural linear polyester-based resin. (4) The ceiling material for an automobile according to (4).
[0012]
(6) The automotive ceiling material according to any one of (1) to (5), wherein the crosslinked foam has a gel fraction of 10% or more.
[0013]
(7) The crosslinked foam was heated on a vertical cylindrical female mold having a diameter D and a depth H so that the surface temperature was 160 ° C., and was straight-formed using a vacuum forming machine. In some cases, the value of the forming draw ratio H / D at the limit at which the crosslinked foam is unfolded and stretched into a cylindrical shape without being broken is 0.5 or more, (1) to (6). The ceiling material for automobiles according to 1.
[0014]
(8) The ceiling material for an automobile according to any one of (1) to (7), wherein the crosslinked foam is obtained by laminating at least one of a front surface material and / or a back surface material.
[0015]
(9) The automotive ceiling material according to any one of (1) to (8), wherein the surface material and / or the back surface material are made of a biodegradable material.
It consists of.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention is an automotive ceiling material comprising a crosslinked foam made of a biodegradable resin, wherein the crosslinked foam has a maximum bending load of 1.0 N or more. The maximum bending load of the crosslinked foam of the present invention needs to be 1.0 N or more. If the maximum bending load is less than 1.0 N, bending of the ceiling material occurs, and the ceiling cannot be supported.
[0017]
The biodegradable resin used in the present invention is not particularly limited, but includes the following.
[0018]
As synthetic polymers, for example, polylactic acid, polyethylene succinate obtained by polycondensation of ethylene glycol and succinic acid or a succinic acid derivative, polybutylene succinate obtained by polycondensation of butanediol and a succinic acid or a succinic acid derivative, butanediol And polybutylene succinate carbonate in which dicarboxylic acid is polycondensed with succinic acid and adipic acid or polybutylene succinate adipate which is a derivative thereof, butanediol and succinic acid, and chain-extended with a carbonate compound such as diethyl carbonate. And aliphatic polyesters obtained by polycondensation of diols and dicarboxylic acids and derivatives thereof. Examples of the lactone resin include ε-caprolactone, β-propiolactone, γ-butyrolactone, δ-valerolactone, enantholactone, 4-methylcaprolactone, 2,2,4-trimethylcaprolactone, and 3,3,5. -Various methylated lactones such as trimethylcaprolactone can be exemplified. Examples of the biodegradable aromatic copolymer polyester include polyethylene terephthalate / succinate copolymer, polyethylene terephthalate / adipate copolymer, polyethylene terephthalate / sebacate copolymer, polyethylene terephthalate / dodecadionate copolymer, and polybutylene Terephthalate / succinate copolymer, polybutylene terephthalate / adipate copolymer, polybutylene terephthalate / sebacate copolymer, polybutylene terephthalate / dodecadionate copolymer, polyhexylene terephthalate / succinate copolymer, polyhexene Xylene terephthalate / adipate copolymer, polyhexylene terephthalate / sebacate copolymer, polyhexylene terephthalate / dodecadionate copolymer, and the like. . Further, there may be mentioned biodegradable cellulose esters such as cellulose acetate, cellulose butyrate, cellulose propionate, cellulose nitrate, cellulose sulfate, cellulose acetate butyrate, and cellulose nitrate acetate. Furthermore, examples of the synthetic polymer include polypeptides such as polyglutamic acid, polyaspartic acid, and polyleucine, and polyvinyl alcohol.
[0019]
Examples of natural polymers include, for example, starches such as raw starches such as corn starch, wheat starch, rice starch, and modified starches such as acetic esterified starch, methyletherified starch, and amylose. Further, natural polymers such as cellulose, carrageenan, chitin / chitosan, and natural linear polyester resins such as polyhydroxybutyrate / valerate can be exemplified. Copolymers of the components constituting these biodegradable resins may be used. These biodegradable resins may be used alone or in combination of two or more.
[0020]
The ratio of the biodegradable resin to all resin components in the resin composition is not particularly limited, but is preferably 50% by weight or more, and more preferably 70% or more. When the amount of the biodegradable resin increases, the decomposition rate increases, and the deformability after decomposition improves. There is no particular limitation on the resin component other than the biodegradable resin, for example, ultra low density polyethylene, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, ultra high molecular weight polyethylene, polypropylene, ethylene- Propylene rubber, polyvinyl acetate, polybutene and the like can be added.
[0021]
As these biodegradable resins, polylactic acid is preferably used because of its high flexural rigidity. More preferably, the molar ratio of d-form to l-form of polylactic acid is d / l = 98/2 to 70/30 or d / l = 2/98 to 30/70. In order to improve the heat resistance, it is preferable that the optical activity of lactic acid is high. However, a polylactic acid resin having almost 100% l-form, which is usually used for fibers, has a high crystallinity and a crosslinked foam. In such a case, the crosslinking reaction hardly proceeds even when electron beam irradiation or the like is performed. If the optical activity of lactic acid decreases, the crystallinity and melting point of polylactic acid decrease, and the heat resistance of the resulting crosslinked foam decreases, which is not preferable. In consideration of the above, the molar ratio between the d-form and the l-form is preferably d / l = 98/2 to 70/30 or d / l = 2/98 to 30/70, and more preferably the d-form and the l-form. The molar ratio of 1-isomer is d / l = 97/3 to 80/20 or d / l = 3/97 to 20/80. Furthermore, from a commercial point of view, naturally occurring l-lactic acid is more readily available, so that the molar ratio of d-form and l-form is substantially d / l = 2 / 98-30 / 70. is there.
[0022]
In addition, as long as the object of the present invention is not impaired, a resin other than polylactic acid may be copolymerized. It is a preferred embodiment to add a chain extender such as a polyfunctional isocyanate or a polyfunctional glycidyl ester as needed to adjust the melt viscosity.
[0023]
In the present invention, in order to achieve both heat resistance and flexibility, the mixing ratio of the polylactic acid and the biodegradable polyester resin other than the polylactic acid is preferably 10/90 to 90/10. When the mixing ratio of polylactic acid is increased, the heat resistance is improved, but the flexibility is reduced, so that it cannot be rolled up as a sheet-like crosslinked foam, and the buffering property is reduced, which is not preferable. When the amount of the other biodegradable polyester resin increases, the flexibility improves, but the heat resistance decreases. Here, the biodegradable polyester resin other than polylactic acid is not particularly limited, but is preferably a lactone resin, an aliphatic polyester, an aromatic copolymerized polyester, and a natural linear polyester because of compatibility with polylactic acid. A system resin is preferably used.
[0024]
The present invention is a crosslinked foam obtained by crosslinking a biodegradable resin, and the gel fraction showing such a degree of crosslinking is preferably 10% or more, more preferably 15% or more, and most preferably 20% or more. It is. By using a crosslinked foam, the sheet-like crosslinked foam can be processed into a desired shape by reheating and performing vacuum molding, compression molding, stamping molding, and the like. This is preferable because the moldability is greatly improved and the moldability can be easily performed in a wide range of molding temperature from low temperature to high temperature. Further, it is preferable that the heat resistance is high because the dimensional change due to a temperature change is reduced.
[0025]
The method for introducing a crosslinked structure into the biodegradable resin foam which is a feature of the present invention is not particularly limited, and examples thereof include a method of irradiating a predetermined dose of ionizing radiation, crosslinking with a peroxide, and silane crosslinking. Can be.
[0026]
Among these, a method of crosslinking a resin by ionizing radiation can be preferably used because the surface of the crosslinked foam can be molded with beautiful appearance. Examples of the ionizing radiation include α-rays, β-rays, γ-rays, and electron beams. The irradiation dose of the ionizing radiation is usually 10 to 500 kGy, preferably 20 to 300 kGy. If the irradiation dose is too small, sufficient melt viscosity cannot be obtained to retain the bubbles during foam molding, and if it is too large, the melt tension during foam molding is too high, and gas escape occurs, resulting in cross-linked foam with good surface properties. I can't get my body.
[0027]
The foaming agent used in the present invention may be any compound as long as it is a liquid or solid compound at room temperature and decomposes or vaporizes when heated above the melting point of the biodegradable resin as long as it does not substantially interfere with sheeting or crosslinking reaction. Among them, a pyrolytic foaming agent having a decomposition temperature in the range of 120 ° C to 270 ° C is preferable. Specific examples thereof include azo compounds such as azodicarbonamide and metal salts of azodicarboxylic acid; hydrazine derivatives such as hydrazodicarbonamide, 4,4′-oxybis (benzenesulfonylhydrazide) and toluenesulfonylhydrazide; 'Nitroso compounds such as dinitrosopentamethylenetetramine; semicarbazide compounds such as toluenesulfonyl semicarbazide; and bicarbonates such as sodium hydrogencarbonate.
[0028]
In order to control the decomposition temperature in the foaming agent, for example, those containing a decomposition temperature regulator such as zinc oxide, zinc stearate, and urea can be preferably used.
[0029]
In addition, these foaming agents are used in the range of 0.1 to 40 parts by weight with respect to 100 parts by weight of the biodegradable resin, and the mixing amount can be arbitrarily changed depending on each kind and foaming ratio.
[0030]
The crosslinking aid used in the present invention is used to efficiently introduce a crosslinking structure into a biodegradable resin, and a polyfunctional monomer can be mainly used as the crosslinking aid. When a crosslinking assistant is used in combination, a crosslinked structure can be efficiently introduced with a small dose, so that productivity is improved and deterioration of the resin can be prevented, so that it is preferably used.
[0031]
These crosslinking assistants are not particularly limited, and conventionally known polyfunctional monomers such as 1,6-hexanediol dimethacrylate, ethylene glycol diacrylate, ethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, tetramethylol methane triacrylate Acrylate or methacrylate compounds such as 1,9-nonanediol dimethacrylate and 1,10-decanediol dimethacrylate; allyls of carboxylic acids such as triallyl trimellitate, triallyl pyromellitic ester, diallyl oxalate Esters: Allyl esters of cyanuric acid or isocyanuric acid such as triallyl cyanurate and triallyl isocyanurate; N-phenylmaleimide, N, N'-m-phenylenebismale Maleimide-based compounds such as imides; compounds having two or more triple bonds such as dipropagyl phthalate and dipropagyl maleate; polyfunctional monomers such as divinylbenzene can be used; from the viewpoint of ease of handling and versatility And polyfunctional methacrylic acid-based compounds are preferred, and among these, ethylene glycol dimethacrylate, 1,3-butylene glycol dimethacrylate, trimethylolpropane trimethacrylate, 1,6-hexanediol dimethacrylate, 1,9-nonanediol di Ester-based polyfunctional monomers such as methacrylate are particularly preferably used. These polyfunctional monomers can be used alone or in combination of two or more. If the added amount of these polyfunctional monomers is too small, a good crosslinked foam cannot be obtained, and if the amount is too large, the moldability of the obtained crosslinked foam is reduced. , Preferably 0.5 to 10 parts by weight, more preferably 1 to 7 parts by weight.
[0032]
Various additives may be added as long as the effects of the present invention are not impaired. For example, as additives, crosslinking agents, antioxidants, lubricants, heat stabilizers, pigments, flame retardants, antistatic agents, nucleating agents, plasticizers, antibacterial agents, biodegradation accelerators, foaming agent degradation accelerators, light stabilizers , An ultraviolet absorber, an antiblocking agent, a filler, a deodorant, a thickener, a foaming aid, a foam stabilizer, a metal harm inhibitor, and the like. These may be used alone or in combination of two or more. . In particular, polylactic acid is a polymer that is easily degraded by oxidation, and preferably contains an antioxidant.
[0033]
The expansion ratio of the crosslinked foam of the present invention is preferably 1.5 to 50 times. When the expansion ratio is less than 1.5 times, the lightness tends to decrease and sagging due to its own weight occurs. On the other hand, when the expansion ratio exceeds 50 times, the rigidity tends to decrease, and folding wrinkles occur.
[0034]
The crosslinked foam of the present invention is obtained by heating the crosslinked foam on a vertical cylindrical female mold having a diameter D and a depth H so that the surface temperature becomes 160 ° C., and straight-forming using a vacuum forming machine. In addition, it is preferable that the value of the forming draw ratio H / D at the limit where the crosslinked foam is developed and elongated into a cylindrical shape without being broken is 0.5 or more. If the value of the molding draw ratio H / D is less than 0.5, breakage occurs during molding, and it is difficult to mold the crosslinked foam into a complicated shape.
[0035]
In the automotive ceiling material of the present invention, at least one of a surface material and / or a back surface material can be laminated on a crosslinked foam formed by crosslinking a biodegradable resin. The surface material is for decorating or protecting the surface of the ceiling material, and a nonwoven fabric, a woven fabric (knitted surface fabric), a fabric, a plastic sheet, or the like is appropriately used. The back surface material is for protecting the back surface of the ceiling material, and is made of an appropriate sheet material such as a nonwoven fabric or a plastic sheet. The materials of the front surface material and the back surface material are not particularly limited, but it is preferable to use a biodegradable material from the viewpoint of reducing the environmental load at the time of disposal.
[0036]
【Example】
Next, the present invention will be described based on examples. The measuring method and evaluation criteria in the present invention are as follows.
[0037]
1. After weighing 50 mg of the foam sheet having a gel fraction of the crosslinked foam and immersing the sheet in 25 ml of chloroform at 25 ° C. for 3 hours, it is filtered through a 200-mesh stainless steel wire gauze, and the insoluble portion of the wire gauze is dried in vacuo. Next, the weight of the insoluble portion was precisely weighed, and the degree of crosslinking was calculated as a percentage according to the following equation.
Gel fraction (%) = {weight of insoluble matter (mg) / weight of weighed crosslinked foam (mg)} × 100.
[0038]
2. Expansion ratio The expansion ratio is defined as the reciprocal of the apparent density of the crosslinked foam measured according to JIS K6767.
[0039]
3. The thickness crosslinked foam was cut out to 10 × 10 cm, and the center thereof was measured according to JIS-K-6767.
[0040]
4. A test piece of 5 × 15 cm is taken from the maximum bending load crosslinked foam, and the test piece is fixed to a universal testing machine so that the span becomes 10 cm, and a pushing speed of a load of 50 mm / min is applied vertically downward to the center of the span. And the maximum load was measured and determined.
[0041]
5. Formability Vacuum forming was performed, and the appearance and the draw ratio were evaluated, respectively. Appearance is free of visual swelling and wrinkles, and the cross-linked foam is heated to a surface temperature of 160 ° C. on a vertical cylindrical female mold having a forming draw ratio of diameter D and depth H, and vacuum forming. It is the value of the forming draw ratio H / D at the limit where the crosslinked foam can be unfolded and stretched in a cylindrical shape without breaking when it is straight formed using a machine. Here, the diameter D is 50 mm. The value was determined according to the following criteria.
Formability :: Forming draw ratio 0.50 or more and good appearance Formability X: Forming draw ratio less than 0.50 or poor appearance.
[0042]
6. Biodegradability Biodegradability was evaluated according to JIS K6953. A predetermined amount of the crushed foam was placed in compost set to 58 ± 2 ° C., and the amount of carbon dioxide generated after a certain period of time was evaluated by gas chromatography to evaluate.
Biodegradability ・ ・ ・: Degradation rate after 45 days has passed 40% or more Biodegradability X: Degradation rate after 45 days has passed is less than 40%
[0043]
[Reference Example 1]
30 parts by weight of polylactic acid in which the molar ratio of d-form and l-form is d / l = 3/97, 70 parts by weight of polybutylene succinate (manufactured by Showa Polymer Co., Ltd.), and azo as a pyrolytic foaming agent 4.5 kg of dicarbonamide (manufactured by Eiwa Chemical Industry Co., Ltd.), 3 kg of 1,6-hexanediol dimethacrylate (manufactured by Mitsubishi Rayon Co., Ltd.) as a crosslinking aid, and Irganox 1010 (Ciba Specialty Chemicals (manufactured by Mitsubishi Rayon Co., Ltd.) as an antioxidant. 0.3 kg of AO-412S (manufactured by Asahi Denka Kogyo KK), and 0.3 kg of AO-412S (manufactured by Asahi Denka Kogyo Co., Ltd.). The mixture was introduced into a twin-screw extruder having a vent of D = 21, extruded from a T-die, and formed into a crosslinked foaming sheet having a thickness of 1.5 mm. The sheet is irradiated with an electron beam of 95 kGy at an accelerating voltage of 800 kV and crosslinked, then continuously introduced into a vertical hot-air foaming apparatus, heated and foamed at 240 ° C. for 4 minutes to form a continuous sheet-like crosslinked foam. I took it.
[0044]
The thickness of the crosslinked foam thus obtained was 2.7 mm, the gel fraction was 43%, the expansion ratio was 17 times, and the maximum bending load was 3.1 N.
[0045]
[Reference Example 2]
40 parts by weight of polylactic acid having a molar ratio of d-form to l-form of d / l = 3/97, and 60 parts by weight of polybutylene succinate adipate (manufactured by Showa Polymer Co., Ltd.). A crosslinked foam was prepared in the same manner as in Example 1.
[0046]
The crosslinked foam thus obtained had a thickness of 2.9 mm, a gel fraction of 45%, an expansion ratio of 18, and a maximum bending load of 3.2N.
[0047]
[Reference Example 3]
30 parts by weight of polylactic acid having a d-form / l-form is d / l = 3/97, 70 parts by weight of polybutylene succinate (manufactured by Showa Polymer Co., Ltd.), and Irganox 1010 as an antioxidant 0.3 kg of Aiba-412S (manufactured by Asahi Denka Kogyo KK) and 0.3 kg of AO-412S (manufactured by Asahi Denka Kogyo KK) were prepared. The temperature of the first half of the cylinder was 175 ° C, and the temperature of the second half was 160 ° C. And introduced into a twin-screw extruder with a vent of L / D = 21, 4.1 wt% of carbon dioxide gas was injected as a foaming agent from the middle of the extruder, and extruded from a circular die to have a thickness of 1.8 mm and a gel fraction. Was 0%, the expansion ratio was 11 times, and the maximum bending load was 3.3N.
[0048]
[Reference Example 4]
100 kg of polybutylene succinate adipate (manufactured by Showa Polymer Co., Ltd.) as a biodegradable resin, 7.0 kg of azodicarbonamide (manufactured by Eiwa Chemical Industry Co., Ltd.) as a foaming agent, and 1,6-hexane as a crosslinking accelerator 3.0 kg of diol dimethacrylate (manufactured by Mitsubishi Rayon Co., Ltd.), and Irganox. 245 (manufactured by Ciba Specialty Chemicals Co., Ltd.) and AO-412S (manufactured by Asahi Denka Kogyo Co., Ltd.) 0.3 kg each, a vented biaxial shaft heated to a temperature at which the foaming agent does not decompose, specifically 160 ° C. It was introduced into an extruder, extruded from a T-die, and formed into a 1.5 mm-thick crosslinked foaming sheet. The sheet was irradiated with an electron beam of 55 kGy at an accelerating voltage of 800 kV and crosslinked, then continuously introduced into a vertical hot-air foaming apparatus, heated and foamed at 230 ° C. for 4 minutes, and wound up as a continuous sheet-like crosslinked foam. .
[0049]
The crosslinked foam thus obtained had a thickness of 3.0 mm, a gel fraction of 38%, an expansion ratio of 20, and a maximum bending load of 0.8N.
[0050]
[Reference Example 5]
Polylactic acid (made by Cargill (USA)) was extruded from a T-die at 200 ° C. with a 30 mmφ single-screw extruder, quenched by a casting roll to obtain a 650 μm unstretched sheet, and then heated to a temperature of 75 ° C. with an infrared heater. Then, the film was roll-stretched 2.0 times in the longitudinal (longitudinal) direction. Next, the film after longitudinal stretching is preheated in a tenter at 75 ° C., and then stretched 1.8 times in the transverse (width) direction with respect to the film width before longitudinal stretching in a stretching zone set at 75 ° C. to a thickness of 180 μm. Was obtained.
[0051]
[Reference Example 6]
Using polylactic acid (manufactured by Cargill (USA)), melt spinning was performed from a round spinneret at a spinning temperature of 200 ° C. and a single hole discharge rate of 1.00 g / min. Next, the spun yarn was cooled by a cooling air flow, subsequently taken out by air soccer at 3000 m / min, opened, and deposited on a collecting surface of a moving conveyor to form a web. Next, the web was passed through a partial thermocompression bonding device composed of an embossing roll, and partially rolled under the conditions of a roll temperature of 140 ° C., a compression area ratio of 14.9%, a compression point density of 21.9 pieces / cm 2 , and a linear pressure of 30 kg / cm. To obtain a polylactic acid nonwoven fabric having a basis weight of 20 g / m 2 and a long fiber of single denier 3.0 denier.
[0052]
[Example 1]
One side of the crosslinked foam of Reference Example 1 was bonded to the polylactic acid film of Reference Example 5 as a back surface material, and the other foam surface was bonded to the polylactic acid nonwoven fabric of Reference Example 6 to obtain a ceiling material for automobiles.
[0053]
[Example 2]
An automobile ceiling material was prepared in the same manner as in Example 1 except that the foam of Reference Example 2 was used.
[0054]
[Comparative Example 1]
An automobile ceiling material was prepared in the same manner as in Example 1 except that the foam of Reference Example 3 was used.
[0055]
The ceiling material thus obtained was broken during molding and could not be formed into a ceiling shape.
[0056]
[Comparative Example 2]
A ceiling material for an automobile was prepared in the same manner as in Example 1 except that the crosslinked foam of Reference Example 4 was used.
[0057]
The ceiling material obtained in this manner had low rigidity and caused deflection, and could not support the ceiling material.
[0058]
[Table 1]
[0059]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the environmental burden at the time of disposal is eliminated, and it is lightweight and can provide the ceiling material for vehicles excellent in rigidity, dimensional stability, and moldability.

Claims (9)

  1. An automotive ceiling material comprising a crosslinked foam made of a biodegradable resin, wherein the maximum bending load of the crosslinked foam is 1.0 N or more.
  2. The automotive ceiling material according to claim 1, wherein the crosslinked foam is a crosslinked foam using polylactic acid, a pyrolytic foaming agent, and a crosslinking aid.
  3. 3. The polylactic acid according to claim 2, wherein the molar ratio of the d-form and the l-form is d / l = 98/2 to 70/30 or d / l = 2/98 to 30/70. 4. Automotive ceiling materials.
  4. The crosslinked foam according to any one of claims 1 to 3, wherein the crosslinked foam is formed using 90 to 10 parts by weight of polylactic acid and 10 to 90 parts by weight of a biodegradable polyester resin other than polylactic acid. An automotive ceiling material as described in Crab.
  5. The biodegradable polyester resin other than the polylactic acid is a lactone resin, an aliphatic polyester, an aromatic copolymerized polyester, and at least one selected from natural linear polyester resins. 5. The automotive ceiling material according to item 4.
  6. The automotive ceiling material according to any one of claims 1 to 5, wherein the crosslinked foam has a gel fraction of 10% or more.
  7. When the crosslinked foam is heated to a surface temperature of 160 ° C. on a vertical cylindrical female mold having a diameter D and a depth H, the crosslinked foam is straight-formed using a vacuum forming machine, The automotive drawing according to any one of claims 1 to 6, wherein the value of the drawing ratio H / D at the limit where the crosslinked foam is unfolded and elongated into a cylindrical shape without being broken is 0.5 or more. Ceiling material.
  8. The ceiling material according to any one of claims 1 to 7, wherein the crosslinked foam is formed by laminating at least one of a front surface material and / or a back surface material.
  9. The automotive ceiling material according to any one of claims 1 to 8, wherein the surface material and / or the back surface material are made of a biodegradable material.
JP2003148834A 2003-05-27 2003-05-27 Ceiling material for automobile Pending JP2004352752A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010030288A (en) * 2008-06-25 2010-02-12 Toray Ind Inc Interior material article for automobile

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010030288A (en) * 2008-06-25 2010-02-12 Toray Ind Inc Interior material article for automobile

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