JP2005104300A - Roof molding and forming method for roof molding main body section - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roof molding having a body section which can be extrusion-molded without compounding in advance, and in addition, without causing harmful effects to the surface layer section, and also, hardly undergoes deformation after molding, and a molding method for the roof molding body section. <P>SOLUTION: The roof molding body section 13 which is inserted in a groove on the roof of an automobile is constituted of a resin containing a reactor TPO (R-TPO) and an inorganic filler. The reactor TPO, preferably, comprises a plurality of kinds having different rigidities. Also, for the reactor TPO, the average particle diameter of a domain rubber, preferably, is 0.5 to 2.0 μm, and the MFR, preferably, is 0.1 to 30 g/10 minutes. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a roof molding mounted in a groove of a roof of an automobile and a method for forming a roof molding main body.

  As shown in FIG. 2 and FIG. 3 showing its 3-3 cross section, the roof molding 20 is often attached to the roof R of the automobile. Since the roof molding 20 hides the joint line L formed between the roof panel R1 and the outside panel R2 of the automobile, the roof molding 20 is formed in a groove S provided at the joint between the panels R1 and R2 in the longitudinal direction of the automobile. Attached along. Reference numeral G denotes a windshield.

  The illustrated roof molding 20 includes a surface layer portion 21, a main body portion 23 formed on the back side of the surface layer portion 21, and lips 25 formed on both sides of the main body portion 23. The surface layer portion 21 constitutes a design surface of the roof molding 20, and the main body portion 23 constitutes a portion inserted into the groove S of the roof. The lip 25 prevents the main body portion 23 from being lifted from the groove S in the groove S. The main body 23 is often embedded with a metal core 27 made of iron or the like in order to suppress the expansion and contraction of the roof molding 20 in the length direction due to temperature changes.

  Each part of the roof molding 20 is made of a material suitable for each part and is integrally formed by coextrusion molding. In particular, the main body portion 23 is a portion that is also referred to as a core portion or a leg portion, and the shape maintainability of the entire roof molding 20 and the deformability so as to be able to follow the groove S, , Moderate rigidity for facilitating insertion into the groove S, surface smoothness for preventing adverse effects such as irregularities on the surface of the surface layer portion 21, and further suppressing expansion and contraction due to temperature changes Therefore, a low coefficient of linear expansion is required.

For this reason, the roof molding body is made of a molding material composed of a thermoplastic elastomer and an inorganic filler. Further, when the thermoplastic elastomer and the inorganic filler are directly supplied to the extrusion molding machine and mixed in the extrusion molding machine to extrude the roof molding main body, the molding material is not sufficiently mixed in the extrusion molding machine, and the roof molding main body. It is known that the physical properties of the part are easily damaged. Therefore, in order to extrude the roof molding main body part with good physical properties, resin such as PP and PE for thermoplastic elastomer and rubber such as EPR are formed into pellets, and further the pellets such as PP, PE and EPR and inorganic A filler is compounded (melted and mixed) with a granulator to form a compound, and the resulting compound is supplied to an extruder to perform extrusion molding of the roof molding body.
JP 2002-128970 A JP 2000-95920 A

  However, in the prior art, as described above, before supplying the molding material for the roof molding main body to the extrusion molding machine, the resin material must first be made into pellets and further compounded using the obtained pellets. However, there is a problem that the material cost becomes high because the compounding cost is added. In particular, in order to form a compound in which the inorganic filler or rubber is well dispersed in PP or the like, it is necessary to perform compounding with a kneader having high kneading performance, which causes a problem that the cost of the apparatus increases. In addition, since the physical properties such as rigidity and linear expansion coefficient required for the main body differ depending on the type of vehicle that is installed, the roof molding must be compounded using a resin that meets the required physical properties, and the resin can be switched by switching the compound. There is a problem in that loss of resin tends to occur when padding. In addition, it is necessary to have a stock of the compound for each roof molding main body part having different required physical properties, and there is a problem that the inventory cost and the inventory management of the compound become complicated.

  The present invention has been made in view of the above points, and can supply the molding material to the extrusion molding machine without pre-compounding to extrude the roof molding main body, and to the surface layer of the roof molding. Provided are a roof molding having a main body portion that has less adverse effects and is less likely to be deformed after extrusion molding, and a method for molding the roof molding main body portion.

  According to the first aspect of the present invention, a roof molding main body inserted into a groove of a roof of an automobile is used as a reactor TPO having an average particle diameter of domain rubber of 0.5 μm to 2 μm and an MFR value of 0.1 to 30 g / 10 minutes. And a roof molding characterized by comprising a resin containing an inorganic filler having an average particle diameter of 3 μm to 10 μm.

  The invention of claim 2 is characterized in that, in claim 1, the reactor TPO comprises a plurality of types having different rigidity.

  A third aspect of the invention is characterized in that, in the first or second aspect, the reactor TPO comprises a plurality of types, and at least one type of the reactor TPO comprises a master batch in which the inorganic filler is kneaded.

  In the invention of claim 4, when the roof molding main body portion inserted into the groove of the roof of the automobile is extruded, the average particle diameter of the domain rubber is 0.5 μm to 2 μm and the MFR value is 0.1 to 30 g / 10. Minute batch of reactor TPO with an inorganic filler having an average particle diameter of 3 μm to 10 μm, an average particle diameter of domain rubber of 0.5 μm to 2 μm, and an MFR value of 0.1 to 30 g / 10 min A reactor TPO non-master batch product is supplied to an extruder, and the roof molding body is extruded by melting and mixing the master batch and the reactor TPO non-master batch product in the extruder. The present invention relates to a method for forming a roof molding main body.

  According to the molding method of the roof molding and the roof molding main body of the present invention, the molding material can be supplied to the extrusion molding machine without compounding in advance and the roof molding main body can be excellently extruded. In addition, according to the present invention, since it is not necessary to compound the molding material in advance, the cost of the roof molding can be reduced, and since no compound is used, there is a stock of compounds for each type of roof molding. This eliminates the need for easier management of the molding material.

  FIG. 1 is a cross-sectional view of a roof molding 10 according to one embodiment of the present invention. The roof molding 10 is mounted in the groove S of the roof R shown in FIGS. 2 and 3 described in the background section, and has a surface layer portion 11 and a main body formed on the back side of the surface layer portion 11. The parts 13 and lips 15 formed on both sides of the main body part 13 are formed integrally by coextrusion molding in which the respective parts are extruded simultaneously.

  The surface layer portion 11 constitutes a design surface of the roof molding 10 and is made of an appropriate resin, but particularly has good weather resistance and scratch resistance, and has good adhesion to the main body portion 13 during extrusion molding. A preferred resin is preferred. In this example, it is made of a resin containing a non-crosslinkable thermoplastic elastomer, low density polyethylene, and an inorganic filler.

  The main body 13 constitutes a portion to be inserted into the groove S of the roof, and the cross-sectional shape is substantially T-shaped in this embodiment. The main body 13 is formed by extrusion using a resin containing a reactor TPO (R-TPO) and an inorganic filler. The reactor TPO and the inorganic filler may be compounded (melted and mixed) and then supplied to the extruder. However, the compound is dry-blended without compounding and supplied to the extruder and melt-mixed in the extruder. This is more preferable because the molding cost of the roof molding can be reduced and the roof molding can be made inexpensive.

  The reactor TPO is also referred to as a polymerization type TPO. A domain rubber component (for example, EPR) that forms a soft part is dispersed in a matrix resin (for example, PP resin) that forms a hard part at the time of polymerization. Differentiated. The compound TPO is obtained by polymerizing a resin and rubber separately and kneading and compounding at least two components obtained by the polymerization. When the matrix resin of the reactor TPO is made of PP, either homo PP or random PP may be used.

  The reactor TPO used in the present invention has a domain rubber (for example, EPR) having an average particle size of 0.5 μm to 2 μm, more preferably 0.5 μm to 1 μm. When the average particle diameter is less than 0.5 μm, poor mixing of the reactor TPO and the inorganic filler occurs in the extruder, and the moldability of the main body part tends to deteriorate, and it becomes difficult to obtain a good main body part. Moreover, the thing exceeding 2 micrometers becomes difficult to acquire in terms of manufacturing technology. The said average particle diameter can be measured by well-known TEM (transmission electron microscope) photography observation.

  The reactor TPO has an MFR (melt flow rate at 230 ° C. and 21.18 N according to JIS-K6921) of 0.1 to 30 g / 10 min. When the MFR is less than 0.1 g / 10 minutes, the discharge rate during extrusion molding is reduced and the molding speed of the roof molding body is reduced. On the other hand, when the MFR exceeds 30 g / 10 minutes, extrusion molding is performed. It becomes difficult to maintain the shape of the roof molding main body.

  The reactor TPO used in the present invention is not limited to one type, and may be a plurality of types having different rigidity. By using a plurality of types of reactors TPO having different rigidity, the roof molding body 13 can be easily adjusted to a required rigidity.

  As the inorganic filler, any appropriate one can be used, and talc is particularly preferable. The average particle diameter of the inorganic filler is suitably 3 μm to 10 μm. When the thickness exceeds 10 μm, poor mixing of the reactor TPO and the inorganic filler is caused in the extruder, the appearance of the main body portion 13 is likely to deteriorate, and the surface layer portion 11 is liable to be adversely affected. On the other hand, when the thickness is less than 3 μm, it is difficult to obtain in terms of manufacturing technology.

  The inorganic filler may be supplied to the extruder separately from the reactor TPO, but in that case, it becomes difficult to disperse the inorganic filler in a large amount and uniformly in the reactor TPO, and the inorganic filler is uniformly dispersed. In order to achieve this, the amount of the inorganic filler must be small, so that it is difficult to obtain the effect of the inorganic filler. Therefore, at least one kind of the reactor TPO is used as a master batch in which an inorganic filler is melt-mixed, and the master batch is supplied to an extruder together with another reactor TPO (non-master batch product) and mixed in the extruder. Extrusion molding is preferred. In this way, the inorganic filler addition amount of the master batch is set to a high concentration in advance, and the master batch and the reactor TPO (non-master batch product) are mixed with an extruder, so that a desired amount of the inorganic filler is uniformly distributed. It becomes easy to disperse in the reactor TPO, and the effect of adding the inorganic filler, that is, the effect of suppressing the shrinkage due to the temperature change of the main body 13 can be sufficiently exhibited.

  The addition amount of the inorganic filler in the master batch is preferably 60 to 70 parts by weight with respect to 100 parts by weight of the reactor TPO. If it exceeds 70 parts by weight, the moldability of the main body part 13 is deteriorated. On the other hand, if the filling amount of the inorganic filler is less than 60 parts by weight, the effect of the inorganic filler cannot be sufficiently obtained.

  In addition, an additive such as a pigment (for example, carbon) is appropriately added. A necessary amount of the additive is supplied to the extruder together with the reactor TPO and the master batch, and is mixed with the reactor TPO and the master batch in the extruder.

  In the present embodiment, a metal core 17 made of iron or the like is embedded in the main body 13 at the time of extrusion of the roof molding 10 in order to suppress expansion and contraction in the length direction of the roof molding 10 due to temperature changes. ing.

  The lip 15 is provided to prevent the main body 13 from floating from the groove S of the roof, and is made of a material that is more flexible than the main body 13. In this embodiment, it consists of a crosslinkable thermoplastic elastomer.

  The roof molding 10 having the above-described configuration is manufactured by integrally forming the surface layer portion 11, the main body portion 13, and the lip 15 by known coextrusion molding. At that time, for the main body 13, a master batch in which an inorganic filler is melt-mixed in the reactor TPO and a reactor TPO (non-master batch product) that does not contain the inorganic filler are dried without being melt-mixed in advance. It is preferable to blend and supply to an extruder, and melt-mix in the extruder and extrude.

  Master batches T1 to T11 made of inorganic filler, R-TPO, resin and pigment shown in Table 1 were prepared by a known method. Master batches T1 to T3 are used in the comparative examples, and master batches T4 to T11 are used in the examples. Each of R-TPO-1 to 4 is a reactor TPO in which the matrix resin is PP and the domain rubber is EPR. R-TPO-1 has an average particle diameter of domain rubber of 0.5 μm, MFR of 1.5 g / 10 min, trade name: HIFAX 7334XEP, manufactured by Basell, and R-TPO-2 is made of domain rubber. Average particle diameter is 1.0 μm, MFR is 2.5 g / 10 min, trade name: HIFAXCA138A, manufactured by Basell, R-TPO-3 has an average particle diameter of 0.2 μm domain rubber and an MFR of 0. 5 g / 10 min, trade name: Adflex KS021P, manufactured by Basell, R-TPO-4 has an average particle diameter of domain rubber of 0.2 μm, MFR of 10 g / 10 min, trade name: Idemitsu TPOM142, Idemitsu Oil Made of Chemical Co. Also, the flexural modulus (JIS K7203) showing the rigidity is 20 Mpa for R-TPO-1, 400 Mpa for R-TPO-2, 230 Mpa for R-TPO-3, and 90 Mpa for R-TPO-4. Inorganic filler talc 1 has an average particle size of 6 μm, trade name: LMR-100, manufactured by Fuji Talc, talc 2 has an average particle size of 12 μm, product name: LMR, manufactured by Fuji Talc, and talc 3 has an average particle. Diameter 14 μm, trade name: PK50, manufactured by Fuji Talc. The pigment is carbon, trade name: # 7360SB, manufactured by Tokai Carbon Co., Ltd.

  Moreover, in order to confirm the effect of this invention, product No. which consists of a mixing | blending of Table 2 is shown. 1 to 16 roof molding main body portions (not provided with the surface layer portion and the lip) were extruded. Product No. 1 corresponds to the conventional example, PP, EPR, talc 1 (same as talc 1 in Table 1) and carbon are separately kneaded outside the extruder and compounded, and the resulting compound is extruded. The roof molding body is extruded by feeding to a machine. Product No. 2 to 4 correspond to comparative examples, and PP and EPR are dry blended with any one of the master batches T1 to T3, supplied to the extrusion molding machine, and melt mixed in the extrusion molding machine to extrude the roof molding main body. Molded. In contrast, product no. 5 to 16 correspond to examples of the present invention. Product No. No. 5, R-TPO-1, R-TPO-2 and masterbatch T4 are separately kneaded and compounded in advance outside the extruder, and the resulting compound is supplied to the extruder and the roof molding body The part is extruded. Product No. Nos. 6 to 16 are dry blended without compounding at least one of R-TPO-1 to 4 and master batches T4 to T11, supplied to the extruder, and melt mixed in the extruder. Then, the roof molding main body is extruded.

  Thus, with respect to the roof molding main-body part (product No. 1-16) obtained by extrusion molding, surface appearance, a shape, and curvature were evaluated. The evaluation of the surface appearance was determined in three stages by visually observing the presence / absence of unevenness and the degree of unevenness on the surface of the main body portion, with ○ indicating that there was no unevenness, Δ indicating slightly existing, and X indicating many existing. The evaluation of the shape is made in three stages: ◯ when the main body extruded from the extruder has a predetermined shape, △ when it is slightly off, and × when it is greatly off. Judged. The warpage was evaluated by placing the main body after extrusion molding on a surface plate and observing the warpage after being left at 23 ° C. for 24 hours, ◯ when there was no warpage, and Δ when it was slightly warped. In the case of a large warp, the determination was made in three stages.

  The evaluation results are as shown in the lower part of Table 2. The inorganic filler (talc 1) having an average particle diameter of 6 μm, the average particle diameter of the domain rubber is 0.5 μm to 1 μm, and the MFR is 1.5 to 2.5 g. / 10 minute reactor TPO (R-TPO-1, 2) and master batch (T4, T9, T10). For 5, 6, 10, and 11, all of the surface appearance, shape, and warpage were good, and the quality was particularly good. In addition, the product No. 7 to 9 and 12 to 16 were also sufficiently usable quality.

  The product no. FIG. 1 shows the co-extrusion molding of 10 roof molding body parts, a surface layer part made of a resin containing a non-crosslinkable thermoplastic elastomer, low density polyethylene and an inorganic filler, and a lip made of a crosslinkable thermoplastic elastomer. When the roof molding 10 was molded, the moldability was good and the surface of the surface layer of the obtained product was also good.

It is sectional drawing of the roof molding in one Example of this invention. It is a perspective view which shows a part of roof of the motor vehicle with which the roof molding was mounted | worn. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2.

Explanation of symbols

10 Roof molding 11 Surface layer 13 Body 15 Lip G Glass R Roof S Groove

Claims (4)

  The roof molding main body inserted into the groove of the roof of the automobile has a reactor TPO with an average particle diameter of domain rubber of 0.5 μm to 2 μm, an MFR value of 0.1 to 30 g / 10 min, and an average particle diameter of 3 μm. A roof molding comprising a resin containing an inorganic filler of 10 μm to 10 μm.   The roof molding according to claim 1, wherein the reactor TPO includes a plurality of types having different rigidity.   The roof molding according to claim 1 or 2, wherein the reactor TPO includes a plurality of types, and at least one type of the reactor TPO includes a master batch in which the inorganic filler is kneaded. When extruding the roof molding body that is inserted into the groove of the car roof,
A master batch in which an inorganic filler having an average particle diameter of 3 μm to 10 μm is kneaded in a reactor TPO having an average particle diameter of 0.5 μm to 2 μm and an MFR value of 0.1 to 30 g / 10 min; A reactor TPO non-master batch product having an average particle size of 0.5 μm to 2 μm and an MFR value of 0.1 to 30 g / 10 min is supplied to an extruder,
A method for molding a roof molding main body, comprising: melting and mixing the master batch and a non-master batch product of the reactor TPO in the extrusion molding machine to extrude the main body of the roof molding.

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