JP2009280676A - Vegetable-originated component-containing adhesive sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive sheet that can control increase of carbon dioxide content in the atmosphere, can reduce fossil fuel consumption, and can perform recycling such as material recycling, hence is gentle to environment, moreover can achieve a low VOC by applying the same to automotive interior materials to which is hitherto difficult to use adhesive materials. <P>SOLUTION: The vegetable-originated component-containing adhesive sheet is produced by extruding a copolymerized polyamide resin that is synthesized by using raw materials whose one part or 100% is vegetable-originated components selected from castor oil, sunflower oil and coconut oil, and has chracteristics such as a melting point of 80-160°C and a volume flow rate (MVR) of 8-50 (Ð 170°C/2.16 Kg)cm<SP>3</SP>/10 min, and by making up a spider-web-type or three-dimensional solid construction whose line diameter is 0.02-0.5 mmϕ and a range of weight per unit surface area is 5-200 g/m<SP>2</SP>. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to an adhesive sheet containing a plant-derived component, and more particularly to an adhesive sheet formed from a resin obtained by synthesizing a raw material containing a plant-derived component, which is environmentally friendly and reduces CO ₂ emissions.

Conventionally, a web-like or three-dimensional three-dimensional adhesive sheet is known (see, for example, Patent Document 1), and is widely used as an interlayer adhesive in pasting automobile interior materials and nonwoven fabric laminates. However, most of the above-mentioned conventionally used adhesives are made from petroleum-derived components such as polyester and polypropylene, and there are no adhesives derived from plant-derived components. However, recently, pollution for ventilation due to the concentration of CO ₂ in the atmosphere has been regarded as a problem, and reduction of CO ₂ emissions has been demanded and interest has been in the use of renewable resources. Therefore, we focused on plant-derived components as effective substances for suppressing CO ₂ increase, reducing CO ₂ generation with fossil fuels, and reducing CO ₂ consumption, and proceeded with the study of their use in adhesive sheets.
JP-A-7-302682

In view of the actual situation as described above, the present invention finds a resin obtained by synthesizing a raw material containing a plant-derived component particularly suitable as an adhesive sheet in order to cope with this, and by finding its characteristics and sheet structure, ₍₂ ) Emissions of volatile organic compounds even in automotive interior materials that are environmentally friendly and that have been difficult to use as adhesives can be controlled by increasing the concentration, reducing fossil fuel consumption, material recycling, biorecycling, etc. It aims at providing the adhesive sheet which can implement | achieve reduction (low VOC).

That is, the adhesive sheet of the present invention that achieves the above object has a melt volume flow rate (MVR) (in the text, simply abbreviated as volume flow rate) in the range of a melting point of 80 to 160 ° C. composed of synthesis of raw materials containing plant-derived components. ) is formed by ejecting 8~50 (@ 170 ℃ / 2.16Kg) copolyamide resin having a characteristic of cm ³ / 10min, wire diameter 0.02～0.5Mmfai, basis weight mass 5~200g It has a three-dimensional structure which is / m ² or a web-like structure.

  Here, plant-derived components include castor oil, sunflower oil, coconut oil, synthesized as a raw material containing 100% or a part, preferably 25% or more, of one or a mixture of two or more of these, A copolymerized polyamide resin is produced.

According to the above-mentioned adhesive sheet of the present invention, since it is formed from plant-derived component-containing raw materials, it is possible to reduce CO ₂ emissions and suppress an increase in the concentration of CO ₂ in the atmosphere, unlike synthetic components derived from petroleum. In addition, it contributes to the reduction of fossil fuel consumption due to petroleum-derived components, and it is possible to use recycled resources. It is used as an environmentally friendly adhesive for bonding automotive interior materials, reducing the emission of volatile organic compounds (low VOC) can be realized.

  In addition, since it is created in a three-dimensional structure or a web-like structure, there are a large number of voids between the filaments, it does not hinder ventilation, and it is line bonded and has a good adhesive effect. .

  Hereinafter, specific embodiments of the present invention will be described. First, the adhesive sheet of the present invention uses a plant-derived raw material and is made of a manufactured resin. As a plant-derived material, castor oil, sunflower oil, coconut oil or a mixture is used, and 100% or a part, preferably 25% or more, of the raw material is prepared and synthesized to form an adhesive sheet A copolymerized polyamide resin is produced, and the resin is discharged by known means to form a web of a web or a three-dimensional structure.

Here, the copolymerized polyamide resin prepared from the plant-derived raw material has a melting point range of 80 to 160 ° C., and a volume flow rate (MVR) of 8 to 50 (@ 170 ° C./2.16 kg) cm ^3. It is effective to have a characteristic of / 10 min. If the melting point is less than 80 ° C., the processing conditions for carrying out the bonding are difficult, which is not preferable from the viewpoint of the heat resistance of the bonding point of the adherend, and if the melting point exceeds 160 ° C., the characteristics of the adherend itself by the bonding treatment It is not preferable because it may cause damage.

On the other hand, the volume flow rate (MVR) is a resin extrusion rate, 8 If it is (@ 170 ℃ / 2.16Kg) of less than cm ³ / 10min, penetration and wetting of the adhesive of the adhesive body surface is poor, whereas, exceeds 50 (@ 170 ℃ / 2.16Kg) cm 3 / 10min, the adhesive amount of the surface becomes badly permeates or wet state of the adhesive of the adhesive body surface is poor, since adhesion is poor undesirably . In addition, the plant origin component in resin is determined by measuring according to the US analytical standard (ASTMD6866).

  In the present invention, an adhesive sheet is prepared using a resin having the above-mentioned characteristics. However, a three-dimensional structure or a web-like structure having a large number of voids is effective for the form and configuration of the prepared adhesive sheet. As a result, the adherence of the adherend becomes line adhesion, and the adhesion efficiency is very good compared to powder adhesion.

  The formation of the adhesive sheet having the web-like structure or the three-dimensional structure can be obtained by discharging the copolymer polyamide resin by a known means. That is, the above-mentioned copolymerized polyamide resin is discharged from a nozzle, randomly deposited on a net by suction by an air soccer method, and wound to obtain a web-like structure, and the copolymerized polyamide resin has a required width and length. The nozzles are ejected from the nozzles arranged at an appropriate pitch between holes on the effective surface of the nozzle, and taken up on a pair of take-up conveyors arranged so as to partially exit the cooling water surface arranged below the nozzle surface, with both sides sandwiched A sheet structure in which the fibers are partly fused with each other in a three-dimensional structure can be obtained by winding into the cooling water and solidifying and then winding.

  The diameter of the spun or discharged wire constituting the three-dimensional structure or the web-like structure thus obtained is preferably in the range of 0.02 to 0.5 mmφ, and the wire diameter is less than 0.02 mmφ. Even if it is made thinner than that, the adhesive force does not change. Therefore, considering the decrease in productivity for making it thinner, it is not a good idea and it also increases the cost of technology and the like, which is not preferable. On the other hand, if the wire diameter exceeds 0.5 mmφ, the adhesive of the adherend is too thick and the gap becomes large, the contact becomes too thick and the bonding surface is reduced, and the bonding efficiency is lowered.

Also, the basis weight mass of the adhesive sheet is preferably in the range of 5 to 200 g / m ² and a basis weight mass range amount adhesive is reduced is less than 5 g / m ^2, poor adhesion to the adherend, the adhesive strength is reduced . If the mass per unit area exceeds 200 g / m ² , the amount of adhesion is sufficient, and the adherence of the adherend is good. However, since the quality is excessive, it is not preferable from the viewpoint of cost. Therefore, the above-described range of the wire diameter of 0.02 to 0.5 mmφ and the basis weight of 5 to 200 g / m ² are effective as the adhesive sheet of the present invention.

  The plant-derived component selected from castor oil, sunflower oil, and coconut oil constituting the copolymerized polyamide resin is not limited to 100%, but may be a raw material partially contained with petroleum-derived components. Although it is good, it is preferable to contain at least 25%. Examples of the present invention will be described below in comparison with comparative examples.

Example 1
Copolyamide resin derived from plant consisting of 100% castor oil (melting point 120 ° C., the volume flow rate 10.0 (@ 170 ℃ / 2.16Kg) cm 3 / 10min) the spinning temperature 200 ° C., the nozzle 0.6mmφ single-hole discharge An amount of 1.0 g / min / h was randomly deposited on a net by suction by an air soccer method and wound up. The wound sheet had a web-like structure, the average diameter of one filament was 0.035 mmφ, and the weight per unit area was 10 g / m ² .
Example 2
Copolyamide resin derived from plant consisting of 100% castor oil (melting point 100 ° C., a volume flow rate 30 (@ 170 ℃ / 2.16Kg) cm 3 / 10min) the spinning temperature 200 ° C., the nozzle 0.6mmφ single-hole discharge rate 1 .2 g / min / h, randomly deposited on the net by air soccer method and wound up. The wound sheet had a web-like structure, the average yarn diameter of one sheet was 0.32 mmφ, and the basis weight was 23 g / m ² .
Example 3
100% castor oil-derived copolymer polyamide resin (melting point 120 ° C, volume flow rate 9 (@ 170 ° C / 2.16Kg cm ³ / 10mm) with a nozzle diameter of 0.8mmφ on the nozzle effective surface 20cm wide and 4cm long Nozzles with a single hole discharge rate of 1.04 g / min from nozzles arranged with a 10 mm pitch between holes, cooling water is placed 25 cm below the nozzle surface, and a stainless steel endless net with a width of 25 cm is parallel A pair of take-up conveyors were arranged so as to partially protrude on the water surface at intervals of 15 mm, and were taken up and solidified by being drawn into 20 ° C. cooling water at a speed of 1 m / min while sandwiching both sides. The taken sheet is a three-dimensional random structure in which the fibers are partly fused, the average yarn diameter of one is 0.32 mmφ, and the weight per unit area is 150 g / m ^2. Met.
Example 4
Copolymer polyamide resin (melting point 110 ° C.,) of 75% obtained from a plant-derived and petroleum consisting of 25% castor oil volume flow rate 36 (@ 170 ℃ / 2.16Kg) cm 3 / 10min) the spinning temperature 200 C., nozzle 0.6 mm.phi. Single-hole discharge rate 1.2 g / min / h, and randomly deposited on a net by suction using an air soccer method. The wound sheet had a web-like structure, the average yarn wire diameter was 0.048 mmφ, and the mass per unit area was 23 g / m ² .
Comparative Example 1
Copolyamide resin derived from plant consisting of 100% castor oil (melting point 120 ° C., the volume flow rate 5.0 (@ 170 ℃ / 2.16Kg) cm 3 / 10min) the spinning temperature 220 ° C., the nozzle 0.6mmφ single-hole discharge An amount of 1.0 g / min / h was randomly deposited on the net by suction by an air soccer method and wound up. The wound sheet had a web-like structure, the average diameter of one filament was 0.038 mmφ, and the basis weight was 30 g / m ² .
Comparative Example 2
Copolymer polyamide resin of plant origin composed of 100% castor oil (melting point 165 ° C., the volume flow rate 0.0 (@ 170 ℃ / 2.16Kg) cm 3 / 10min) the spinning temperature 260 ° C., the nozzle 0.6mmφ single-hole It was randomly deposited on a net and wound up by suction by an air soccer method with a discharge amount of 1.0 g / min / h. The wound sheet had a web-like structure, one yarn wire diameter was 0.042 mmφ, and the mass per unit area was 30 g / m ² .
Comparative Example 3
Copolymer polyamide resin consisting of petroleum 100% (melting point 120 ° C., a volume flow rate 33 (@ 170 ℃ / 2.16Kg) cm 3 / 10min) the spinning temperature 200 ° C. nozzle 0.6mmφ single-hole discharge rate 1.0 g / Min / h was randomly deposited on the net by air soccer method and wound up. The wound sheet had a web-like structure, the average yarn wire diameter was 0.046 mmφ, and the mass per unit area was 30 g / m ² .

The peel strength was measured for each of the above-described inventive examples and comparative examples, and the overall evaluation as an adhesive was confirmed. The results shown in Table 1 were obtained. Measurement of each item in the table was performed based on the following.
(A) Mass per unit area: g / m ²
A size of 50 cm × 50 cm is cut out, the weight at that time is measured, and converted to a weight per 1 m ² .
(B) Thickness: mm
A size of 15 cm × 15 cm is cut out, an initial load of 0.05 g / cm ² is applied, the heights of the four corners are measured, and the average value is shown.
(C) Wire diameter: mm
Using a microscope (manufactured by Keyence Co., Ltd.), the yarn was expanded to 150 times and the yarn diameter was measured. The number of measurements was 10 (n = 10) and was shown as an average value. The unit is mmφ.
(D) Plant-derived carbon content:%
According to ASTM D6866.
(E) Melting point: ° C
DSC measurement Measurement condition Sample amount 10mg
Temperature rising rate 10 ° C / min
Temperature rise temperature 210 ℃
Evaluating the melting point than the melting endothermic curve (F) melt volume flow rate: cm ³ /10min(@170℃/2.16Kg)
According to JIS K7210. Specifically, a predetermined amount of the measurement resin was put into an extrusion type flow tester, a load of 2.16 kg was applied at a test temperature of 170 ° C., and a resin extrusion amount per 10 min was measured.
(G) Peel strength: N / 25mm
A sample was sandwiched between adherends (cotton broad) and treated at a resin melting point + 20 ° C. for 3 seconds at 3 kg / cm ² (gauge). Three 25 mm × 200 mm samples (n = 3) are collected as samples. Using Tensilon manufactured by Toyo Bald-In Co., Ltd., the sample was peeled up to a point of 100 mm at a gripping interval of 100 mm and a pulling speed of 200 mm / min.
(H) Comprehensive evaluation Contains plant-derived components and has sufficient adhesiveness. ○
Contains plant-derived ingredients, but has insufficient adhesive ability,
Alternatively, it has sufficient adhesive ability but does not contain any plant-derived components. ×

上記表１より本発明に係る各接着シートは各比較例に比べ剥離強力が優れ、石油由来によるものと何ら遜色なく、環境にやさしい接着材として極めて有効であることが理解される。

From Table 1 above, it can be understood that each adhesive sheet according to the present invention is superior in peel strength as compared with each Comparative Example, is no different from that derived from petroleum, and is extremely effective as an environmentally friendly adhesive.

Claims (3)

In the range of a melting point of 80 to 160 ° C. of synthetic raw materials containing a plant-derived component, copolymerization volume flow rate (MVR) has a characteristic of 8~50 (@ 170 ℃ / 2.16Kg) cm 3 / 10min A plant characterized by having a three-dimensional structure or a web-like structure having a wire diameter of 0.02 to 0.5 mmφ and a basis weight range of 5 to 200 g / m ² formed by discharging a polyamide resin. Origin component-containing adhesive sheet.   The plant-derived component-containing adhesive sheet according to claim 1, wherein the plant-derived component is one or more selected from castor oil, sunflower oil and coconut oil.   The plant-derived component-containing adhesive sheet according to claim 1 or 2, wherein the plant-derived component content is 25 to 100%.