JP4851115B2 - Disc - Google Patents

Description

  The present invention relates to a sheet-like molded body, and more particularly to a sheet-like molded body having a thickness of 0.35 to 1.0 mm made of an olefin-based thermoplastic elastomer, which is suitable as a valve body for a ventilation duct.

  For example, a vehicle is provided with a ventilation duct device for ventilating the inside of the vehicle. As shown in FIG. 1, in the ventilation duct device, a valve body 21 is attached to an opening 13 of the duct 11 so as to be openable and closable so as to cover the opening from the outside of the vehicle. The valve body 21 of the ventilation duct is also referred to as a butterfly valve, and is configured by a sheet-like molded body having a size that covers the opening portion 13 and can be covered from the outside. In the illustrated example, the upper portion 22 is the opening portion. It is fixed to the upper peripheral edge of 13 and other parts are free, so that it overlaps the outer peripheral edge of the opening 13 by its own weight.

  In the ventilation duct device, when the pressure inside the vehicle becomes higher than the outside of the vehicle, the valve body 21 is pushed from the inside of the vehicle to the outside of the vehicle due to the difference in atmospheric pressure, and swings outwardly with the upper part as a fulcrum. Thus, the opening 13 is opened to ventilate the interior of the vehicle. Conversely, when the air pressure outside the vehicle is higher than the inside of the vehicle, the ventilation duct valve body 21 is pushed from the outside of the vehicle to the inside of the vehicle due to the difference in atmospheric pressure, and closely contacts the periphery of the opening 13. The opening 13 is closed.

  As described above, the valve body 21 of the ventilation duct is required to be flexible so as to be in close contact with the peripheral edge of the opening 13 when the opening 13 is closed. Further, heat resistance dimensional stability as a vehicle component is required. The Conventionally, a vulcanized rubber sheet having a small thickness is used as a valve body of a ventilation duct to satisfy them.

  However, the vulcanized rubber sheet is expensive and has a problem that it becomes garbage because it cannot be recycled at the time of a scrap car or the like. Therefore, in order to cope with such problems, it has been studied to use a sheet-like molded body made of an olefin-based thermoplastic elastomer instead of the vulcanized rubber sheet.

However, when a sheet-shaped molded body is extruded using a conventional olefinic thermoplastic elastomer, the sheet-shaped molded body is easily torn at the time of molding and is not easily pulled by an extruder, and is suitable for a valve body of a ventilation duct. Thus, when the thickness of a sheet-like molded object shall be 1.0 mm or less, there exists a problem that the tear at the time of the said shaping | molding becomes still larger. In addition, the molded sheet-shaped products are often stacked in the required number of sheets during storage before use or transportation to an assembly factory, and some sheet-shaped moldings are performed during the stacking operation. The body may protrude and be stacked, or the stacked state may be tilted during transportation to the assembly site, and may be placed in a deformed state. In that case, in a sheet-like molded body made of a conventional olefin-based thermoplastic elastomer, deformed soot tends to remain even after the deformation state is released, and when used as a valve body of a ventilation duct, the valve body opens the opening 13. When closing, there is a problem that it becomes difficult to adhere to the periphery of the opening 13 and the function as a valve body is not achieved.
JP 2003-34128 A JP 2000-127750 A

  The present invention has been made in view of the above points, and is excellent in heat-resistant dimensional stability and appearance, and further, remains in a deformed state hardly remaining, can be recycled, is inexpensive, and is a valve body of a ventilation duct. Another object of the present invention is to provide a sheet-like molded article suitable as an alternative to a vulcanized rubber sheet.

In the invention of claim 1, 20-40 parts by weight of a fully crosslinked olefin-based thermoplastic elastomer in which a fully crosslinked EPDM particle is microdispersed in a PP matrix and a partially crosslinked EPDM particle are microdispersed. 100 parts by weight of an elastomer component composed of 80 to 60 parts by weight of a olefin-type thermoplastic elastomer, and a thickness of 0.1 to 1.0 parts by weight of erucic amide and oleic amide in total of an olefinic thermoplastic elastomer It concerns on the valve body which consists of a 35-1.0-mm sheet-like molding.

  The invention of claim 2 is characterized in that, in claim 1, the low deformation tensile stress (based on JIS K 6254) of the sheet-like molded body is 0.25 MPa or less.

  A third aspect of the present invention is characterized in that, in the first or second aspect, the olefinic thermoplastic elastomer has a gel fraction of 30 to 36%.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the sheet-like molded body is used for a valve body of a ventilation duct.

  According to the present invention, erucic acid amide and oleic acid are added to 100 parts by weight of an elastomer component composed of 20 to 40 parts by weight of a fully crosslinked olefinic thermoplastic elastomer and 80 to 60 parts by weight of a partially crosslinked olefinic thermoplastic elastomer. By forming a sheet-like molded product having a thickness of 0.35 to 1.0 mm from an olefin-based thermoplastic elastomer containing 0.01 to 1.0 parts by weight of amide in total, it is excellent in heat-resistant dimensional stability and appearance, It was possible to obtain a sheet-like molded body that is less likely to leave deformed soot, is recyclable, and inexpensive, and that is suitable as a substitute for a vulcanized rubber sheet for the valve body of a ventilation duct. Furthermore, by setting the low deformation tensile stress (conforming to JIS K 6254) of the sheet-like molded body to 0.25 MPa or less, it is possible to make the deformation state wrinkles less likely to remain. Furthermore, by setting the gel fraction of the olefinic thermoplastic elastomer to 30 to 36%, the moldability becomes good and the return after deformation becomes good.

  Hereinafter, preferred embodiments of the present invention will be described. The sheet-like molded article of the present invention comprises erucic acid amide in 100 parts by weight of an elastomer component comprising 20 to 40 parts by weight of a completely crosslinked olefinic thermoplastic elastomer and 80 to 60 parts by weight of a partially crosslinked olefinic thermoplastic elastomer. And an olefinic thermoplastic elastomer containing a total of 0.01 to 1.0 part by weight of oleic acid amide and having a thickness of 0.35 to 1.0 mm.

  The fully cross-linked olefinic thermoplastic elastomer and partially cross-linked olefinic elastomer in the present invention are both dynamically cross-linked, and the hard segment is made of polypropylene (PP), while the soft segment is ethylene propylene diene. It consists of copolymer rubber (EPDM). In the fully crosslinked type, the EPDM particles that are completely crosslinked are microdispersed in the PP matrix, while in the partially crosslinked type, the EPDM particles that are partially crosslinked are microdispersed. Dynamic crosslinking refers to kneading a mixture of an olefin resin, EPDM, organic peroxide, and the like in a molten state or a semi-molten state.

  If the amount of the fully-crosslinked olefinic thermoplastic elastomer and the partially crosslinked olefinic thermoplastic elastomer is outside the above amount, molding of the sheet-like molded product may become extremely difficult, and physical properties such as strength may be reduced. Therefore, it becomes unsuitable for the valve body of the ventilation duct. In addition, examples of the fully crosslinked olefin-based thermoplastic elastomer that are commercially available include Santoprene (manufactured by AES Japan), Sarlink 4000 series (manufactured by Toyobo Co., Ltd.), and the like. Also, commercially available partially crosslinked olefinic thermoplastic elastomers include TPE WT485 (manufactured by Sumitomo Chemical Co., Ltd.), Sarlink 3000 series (manufactured by Toyobo Co., Ltd.), Thermolan (manufactured by Mitsubishi Chemical Corporation), Miralastomer (Mitsui Chemicals). For example).

  When erucic acid amide and oleic acid amide are produced using a T-die extruder as a molding machine, the sheet-shaped molded body is improved by improving the slippage of the sheet-shaped molded body at the interface with the die. It acts to suppress the occurrence of tears. In particular, erucic acid amide and oleic acid amide exhibit better lubricity than saturated fatty acid amides such as stearic acid amide, and the combined use of erucic acid amide and oleic acid amide provides better moldability. The total addition amount of erucic acid amide and oleic acid amide is 0.01 to 1.0 part by weight, preferably 0.02 to 0.15 part by weight, more preferably erucic acid amide with respect to 100 parts by weight of the elastomer component. The combined use of 0.01 to 0.10 parts by weight and oleic amide 0.01 to 0.05 parts by weight. If the total amount of the erucic acid amide and oleic acid amide is less than 0.01 parts by weight based on 100 parts by weight of the elastomer component, the effect of preventing tearing at the time of molding cannot be obtained, whereas it exceeds 1.0 parts by weight. The physical properties of the sheet-like molded product are lowered due to the occurrence of bleeding. In addition, erucic acid amide and oleic acid amide may each use the masterbatch which consists of olefin resin.

Other additives such as fluororubber processing aids and antistatic agents may be added to the elastomer component in order to prevent the occurrence of breakage by improving the slippage during molding. Good. Examples of fluororubber-based processing aids include fluororubber, an alloy of fluororubber and polyfluorinated ethylene (Teflon (registered trademark)), or a combination thereof with ethylene copolymer, wax, and internal powder (BaSO ₄ ). be able to. The addition amount of the fluororubber-based processing aid is 1.00 parts by weight or less, preferably 0.10 to 0.60 parts by weight with respect to 100 parts by weight of the elastomer component. Antistatic agents include phosphate ester salts, amide cations, di- (2-hydroxyethyl) alkylamines, fatty acid glycerin esters, fatty acid alkylolamides, sorbitan fatty acid esters, among which di- (2-hydroxy Ethyl) alkylamine, fatty acid glycerin ester, and fatty acid alkylolamide are preferable, and more preferably di- (2-hydroxyethyl) alkylamine and fatty acid glycerin ester are used in combination. The antistatic agent is 1.00 parts by weight or less, preferably 0.05 to 0.5 parts by weight with respect to 100 parts by weight of the elastomer component.

  Furthermore, an antioxidant, a weather resistance improver, an anti-blocking agent, a pigment, a dispersant, a light stabilizer and the like can be added to the elastomer component as necessary. Examples of the anti-blocking agent include silica, talc, kaolin clay, and the like, and natural silica that does not affect the rigidity of the sheet-like molded body with a small addition amount is particularly preferable.

  The olefinic thermoplastic elastomer composed of the above components preferably has a gel fraction of 30 to 36%. When the gel fraction is lower than the above range, the sheet-like molded product is not easily returned from the deformed state and easily deformed, and when the gel fraction is higher than the above range, the sheet-like molded product is molded. It becomes easy to cause tearing at the time of molding due to a decrease in properties. The measurement of a gel fraction is performed based on JISK6796.

  The thickness of the sheet-like molded body is 0.35 to 1.0 mm. If it is thinner than 0.35 mm, if the sheet-like molded body is a valve body (butterfly valve) of a ventilation duct, it is too thin and lacks sealing properties, while if it is thicker than 1.0 mm, it is inflexible and pressure inside and outside the vehicle. It becomes difficult to follow the difference.

  Moreover, it is preferable that the said sheet-like molded object is a low deformation tensile stress (based on JISK6254) being 0.25 Mpa or less. When the low deformation tensile stress (based on JIS K 6254) is greater than 0.25 MPa, the deformation recovery property is impaired and deformation wrinkles easily occur. The low deformation tensile stress may be 0.25 MPa or less, and there is no need to determine the lower limit. However, from the viewpoint of manufacturability, 0.20 to 0.25 MPa is given as an example.

  In addition, the sheet-like molded object of this invention can be manufactured using well-known shaping | molding methods, for example, extrusion molding, such as a T-die method.

  Examples will be specifically described below. Santoprene 111-45 (manufactured by AES Japan) as a fully crosslinked olefinic thermoplastic elastomer that has been dynamically cross-linked, and WT485 (manufactured by Sumitomo Chemical Co., Ltd.) as a partially cross-linked olefinic thermoplastic elastomer that has been dynamically cross-linked. ), Sumikasen EMB10 as erucic acid amide (master batch of 4% erucic acid amide and 96% LDPE, manufactured by Sumitomo Chemical Co., Ltd.), Sumikasen EMB11 as oleic acid amide (master batch of 2% oleic acid amide and 98% LDPE, Sumitomo Chemical) Sumikasen EMB22 (master batch of 10% natural silica and 90% LDPE, manufactured by Sumitomo Chemical Co., Ltd.) as natural silica was blended as shown in Table 1 and charged into a T-die 90 mmφ extruder. And the sheet-like molded object of thickness 0.45mm was extrusion-molded at the extrusion temperature of 180-230 degreeC, and the Example goods and the comparative example goods were obtained. In Table 1, 0.75 part by weight of EMB10 corresponds to 0.03 part by weight of erucamide relative to 100 parts by weight of the elastomer component, and 1.0 part by weight of EMB11 corresponds to 100 parts by weight of the elastomer component. This corresponds to 0.02 part by weight of oleic amide.

  Examples 1 to 3 and Comparative Example 1 obtained as described above had good appearance without tearing during extrusion molding. On the other hand, the comparative example 2 having a high gel fraction partially breaks, while the comparative example 3 which does not contain both erucic acid amide and oleic acid amide breaks during extrusion and becomes a product. There wasn't. For Examples 1 to 3 and Comparative Example 1, low deformation tensile stress (conforming to JIS K 6254), heating expansion / contraction rate (conforming to JIS K 6734, 90 ° C. × 1 hour), Shore hardness D (conforming to JIS K 7215), Specific gravity (conforming to JIS K 7112) and gel fraction were measured. The results are as shown in the lower part of Table 1. In addition, about the Shore hardness D, it measured in the state which accumulated the sheet-like molded object 15 sheets. Further, “MD” and “TD” in the column of low deformation tensile stress and heating expansion / contraction rate in Table 1 indicate directions. “MD” indicates a measurement value in the same direction as the sheet extrusion (pull-out) direction during molding, and “TD” indicates a measurement value in a direction orthogonal to the sheet extrusion (pull-out) direction during molding. The gel fraction was measured based on JIS K 6796, and orthodichlorobenzene was heated to 180 ° C. in an oil bath as the solvent. In Comparative Example 2 and Comparative Example 3, tearing occurred at the time of molding as described above, and a good molded product was not obtained. Therefore, except for the gel fraction of Comparative Example 2, measurement of low deformation tensile stress, etc. Did not do.

  Further, from the sheet-like molded bodies of Examples 1 to 3 and Comparative Example 1, a duct valve body 30 having a projection for engaging with the duct body on the upper side of a substantially rectangular body as shown in FIG. The adhesiveness of the deformed rod and the opening periphery of the duct to the duct valve body 30 was examined as follows. In the duct valve body 30, the dimension a is 193 mm, the dimension b is 72 mm, and the dimension c is 60 mm. In the test for deformed scissors, 15 duct valve bodies 30 were placed on the table 40 in a stacked manner as shown in FIG. 3 and protruded from the end of the table 40 by 3a / 10, that is, 57.9 mm. The protruding portion was left to stand for 30 minutes so as to hang down under its own weight, and then attached to a duct as shown in FIG. In this state, air was supplied to and stopped from the duct, and it was visually determined whether or not the valve body was in close contact with the periphery of the opening of the duct when the air supply was stopped. As a result, in Examples 1 to 3, there was no deformed soot remaining on the valve body, and the valve body securely adhered to the periphery of the opening of the duct when the air supply was stopped. On the other hand, in Comparative Example 1, deformation flaws remained and did not adhere to the periphery of the opening of the duct.

It is sectional drawing which shows an example of a ventilation duct apparatus. It is a top view about the test piece of the valve body of a ventilation duct. It is a figure which shows the test state of the deformation flaw with respect to the test piece of the valve body of a ventilation duct.

Explanation of symbols

11 Duct 13 Duct opening 21, 30 Valve body 40

Claims (4)

Partially crosslinked olefinic thermoplastic elastomer 80 in which 20 to 40 parts by weight of fully crosslinked olefinic thermoplastic elastomer in which PPDM particles that have been completely crosslinked in the PP matrix are microdispersed and microdispersed in EPDM particles that are partially crosslinked A sheet having a thickness of 0.35 to 1.0 mm made of an olefin-based thermoplastic elastomer containing 0.01 to 1.0 part by weight of erucic acid amide and oleic acid amide in 100 parts by weight of the elastomer component consisting of ˜60 parts by weight Valve body consisting of a shaped molded body. The valve body according to claim 1, wherein the low deformation tensile stress (based on JIS K 6254) is 0.25 MPa or less. The valve body according to claim 1 or 2, wherein the olefinic thermoplastic elastomer has a gel fraction of 30 to 36%. The valve body according to any one of claims 1 to 3, characterized in that the for the valve of the ventilation ducts.

Images