JPH04239531A - Automotive formed body of polyamide - Google Patents

Abstract

PURPOSE:To obtain the subject formed body, composed of a specific aromatic polyamide having a specified composition and a specific intrinsic viscosity and excellent in mechanical characteristics such as tensile strength, flexural strength and impact strength and further heat and chemical resistance. CONSTITUTION:The objective formed body of a polyamide is obtained by mixing (A) an aromatic polyamide, composed of (i) 20-60mol% recurring units composed of terephthalic acid component units and diamine component units consisting essentially of hexamethylenediamine and (ii) 40-80mol% recurring units composed of adipic acid component units and diamine component units consisting essentially of the hexamethylenediamine and having 1.0-1.6dl/g intrinsic viscosity measured in concentrated sulfuric acid at 30 deg.C with (B) glass fiber in an amount of preferably 10-200 pts.wt. based on 100 pts.wt. component (A). The aforementioned formed body hardly produces cracks even in repeated contact with gasoline or an anti-freeze.

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a polyamide molded article for automobiles. More specifically, the present invention relates to a polyamide molded article that is used as an automobile part and has excellent mechanical properties such as tensile strength, bending strength, and impact strength, as well as excellent heat resistance and chemical resistance. [Technical Background of the Invention] In recent years, it has been proposed to reduce the weight of automobiles with the aim of improving fuel efficiency, and resin parts are being used instead of parts conventionally made of metal. It is becoming. Unlike general resin moldings, automotive parts are required to have extremely high heat resistance and mechanical strength, and are also chemically resistant, meaning that their properties do not deteriorate even if they come into contact with, for example, gasoline for a long time. sexuality is required. Additionally, auto parts come into contact with calcium chloride, which is sprayed to prevent road surfaces from freezing.
It also needs to have chemical resistance that prevents cracks from forming even after repeated contact with antifreeze agents such as calcium chloride. Furthermore, it is necessary that these automobile parts can be mass-produced with high dimensional accuracy by, for example, compression molding or injection molding. Conventionally, the use of cured resins such as phenol resins or polyimide resins has been considered in consideration of heat resistance for such automobile parts, but these resins have problems with moldability. Therefore, attempts have been made recently to use thermoplastic resins. Among thermoplastic resins, aliphatic polyamides such as nylon 6 and nylon 66 have good moldability and a certain degree of heat resistance, so they are used as materials for forming automobile parts. There is. However, aliphatic polyamides as described above have a high water absorption rate and tend to deteriorate in a relatively short period of time when they come into contact with water in a radiator, for example. In addition, repeated contact with hydrocarbons such as gasoline or antifreeze agents such as calcium chloride tends to cause resin deterioration. By the way, apart from the aliphatic polyamides mentioned above, aromatic polyamides using an aromatic dicarboxylic acid such as terephthalic acid as a dicarboxylic acid component are known (for example, disclosed in Japanese Patent Laid-Open No. 156430/1983). reference). [0006] Such aromatic polyamides have excellent properties such as heat resistance; The properties of aromatic polyamides vary depending on the composition ratio and degree of polymerization. The present inventor has thus discovered that, among various aromatic polyamides, molded articles of aromatic polyamides having a specific composition and intrinsic viscosity have properties particularly required as automobile parts. OBJECTS OF THE INVENTION The object of the present invention is to provide a polyamide molded article for automobiles that has excellent properties such as mechanical properties, heat resistance, chemical resistance, and moldability. Summary of the Invention The polyamide molded article for automobiles of the present invention has the following features:
20 to 20 repeating units consisting of a terephthalic acid component unit and a diamine component unit containing hexamethylene diamine as a main component
60 mol%, and 40 to 80 mol% of repeating units consisting of adipic acid component units and diamine component units mainly composed of hexamethylene diamine, and at 30°C.
Intrinsic viscosity measured in concentrated sulfuric acid is 1.0-1.6 dl/g
It is characterized by being made of an aromatic polyamide within the range of Furthermore, the polyamide molded article for automobiles of the present invention is characterized by comprising the above-mentioned aromatic polyamide and 10 to 200 parts by weight of glass fiber based on 100 parts by weight of the aromatic polyamide. There is. The polyamide molded article of the present invention having the composition and intrinsic viscosity as described above has properties such as mechanical properties, heat resistance, chemical resistance, and moldability required for automobile parts. In particular, properties such as mechanical properties and heat resistance are not easily deteriorated by contact with gasoline or antifreeze agents. DETAILED DESCRIPTION OF THE INVENTION Next, the polyamide molded article for automobiles of the present invention will be specifically explained. The polyamide molded article for automobiles of the present invention is formed from at least two types of repeating units. The first repeating unit is a repeating unit consisting of a terephthalic acid component unit and a diamine component unit containing hexamethylene diamine as a main component. Among these repeating units, a repeating unit whose diamine component is hexamethylene diamine can be represented by the following formula [1]. [Chemical formula 1] ...[1] The polyamide forming the molded article of the present invention is
The repeating unit represented by formula [1] is contained in an amount of 20 to 60 mol%, preferably 30 to 60 mol%, and more preferably 40 to 60 mol%. The second repeating unit forming the polyamide of the present invention is a repeating unit consisting of an adipic acid component unit and a diamine component unit containing hexamethylene diamine as a main component. Among these repeating units, a repeating unit whose diamine component is hexamethylene diamine can be represented by the following formula [2]. [0015] [2] The polyamide forming the molded article of the present invention is
The repeating unit represented by formula [2] is contained in an amount of 40 to 80 mol%, preferably 40 to 70 mol%, and more preferably 40 to 60 mol%. By having the repeating unit represented by formula [1] and the repeating unit represented by formula [2] in the above ratio, the molded article of the present invention can be used as an automobile part. It will have the necessary mechanical properties, heat resistance and chemical resistance. Furthermore, by having such a composition, the water absorption rate of the molded body itself is also reduced. In particular, the expression [
Polyamide in which the content of repeating units represented by formula [1] is slightly higher than the content of repeating units represented by formula [2], or the two are approximately equal (for example, polyamides having formula [1]
The molded body manufactured from the repeating unit represented by: repeating unit represented by formula [2] = 50:50 to 60:40) does not crack even if it is repeatedly heated and cooled while being in contact with calcium chloride. It shows particularly excellent chemical resistance. The composition as described above in the molded article of the present invention can be confirmed, for example, by measuring the spectrum of the molded article using 13C-NMR. The polyamide having the above composition further has an intrinsic viscosity [η] of 1.0 to 1.6 dl/g when measured in concentrated sulfuric acid at 30°C.
It must be within the range of . That is, by using a polyamide having such a limiting viscosity, it is possible to continuously produce a melt-molded body having excellent mechanical properties and good dimensional accuracy. In particular, this limiting viscosity [η
] in the range of 1.1 to 1.5 dl/g has good moldability and particularly excellent heat resistance. Molded bodies manufactured from polyamides having an intrinsic viscosity [η] of less than 1.0 tend to have low mechanical strength as automotive parts. [0018] The melting point of the polyamide forming the molded article of the present invention (value determined by differential thermal analysis at a heating rate of 10°C per minute) is usually 270 to 330°C, preferably 29°C.
It is within the range of 0-330. In addition, this polyamide
It is usually crystalline, and the degree of crystallinity measured by X-ray diffraction is usually in the range of 10 to 30%. Such a polyamide contains a terephthalic acid monomer capable of forming a terephthalic acid component unit, an adipic acid monomer capable of forming an adipic acid component unit, and a hexamethylenediamine component unit. It can be produced by polycondensing a diamine monomer using methods such as a solution polycondensation method, an interfacial polycondensation method, a melt polycondensation method, and a solid phase polycondensation method. [0020] Examples of the terephthalic acid monomer used here include terephthalic acid dihalide and terephthalic diester, in addition to terephthalic acid. In addition, examples of the adipic acid monomer include adipic acid dihalide, adipic diester, and the like, in addition to adipic acid. Moreover, these monomers may be in the form of a salt. Examples include salts formed from terephthalic acid and hexamethylene diamine, salts formed from adipic acid and hexamethylene diamine, and the like. Further, as the diamine monomer, in addition to hexamethylene diamine, a salt formed from hexamethylene diamine and (di)carboxylic acid, etc. can be used. The diamine monomer used in the present invention is mainly composed of hexamethylene diamine, but other diamines may be used as long as the properties of the automotive polyamide molded article of the present invention are maintained. You can also. In this case, hexamethylene diamine is usually 90% by weight or more, preferably 90% by weight or more, based on the total amount of diamine monomers used.
It is used in an amount of 5% by weight, more preferably 98% by weight or more. An example of a method for producing polyamide using the above-mentioned raw materials is shown below. Solution polycondensation is carried out, for example, at a reaction temperature of -5 to 80°C in a solvent that dissolves the above-mentioned raw materials (e.g. benzene, toluene, methylene chloride, chloroform, dimethylacetamide, N-methylpyrrolidone). This is a method of reacting for 5 to 5 hours. When using a halide such as a dihalide as a raw material in this method, it is preferable to carry out the polycondensation reaction in the presence of a hydrogen halide scavenger such as triethylamine. In the interfacial polycondensation method, for example, a corresponding diamine and a hydrogen halide scavenger are dissolved in water, and a surfactant such as sodium lauryl sulfate is added to this aqueous solution at 0.00%.
Separately prepare an organic solvent solution in which dicarboxylic acid dihalide is added in an amount of about 1 to 5% by weight and dissolved in an organic solvent (e.g., benzene, toluene, methylene chloride, chloroform), and mix the above aqueous solution and the organic solvent solution with stirring. -10~5
This is a method of reacting at a temperature of 0°C for 0.5 to 2 hours. In the melt polycondensation method, 0 parts by weight of the dicarboxylic acid monomer and the diamine monomer are used.
．． In the presence of 5 to 40 parts by weight of water, 240 to 30 parts by weight of the raw material
Heating to 0°C and reacting for 0.5 to 5 hours first prepares an oligomer (lower condensate) with [η] of about 0.05 to 0.3 dl/g, and then passes this oligomer into an extruder or The oligomer is introduced into a reaction device such as a kneader where it is reacted while being kneaded in a molten state, and heated to a temperature of about 280 to 360°C for 1 minute to 3 hours (usually about 1 minute to 30 minutes when using an extruder). ) This is a method in which raw materials are reacted in a molten state by heating. Note that water is generated during the reaction in a molten state, but the water generated during the reaction is removed from the system. Further, in this method, when preparing the oligomer, catalysts such as phosphoric acid, sodium hypophosphite, octyl phosphate, and copper chloride, as well as stabilizers and the like may be added. [0024] The solid phase polycondensation method, for example, uses polyamides or oligomers prepared by the various methods described above,
This is a method of heating the solid state to about 250 to 300°C and further reacting under reduced pressure conditions (for example, about 0.1 to 10 mmHg) or in an inert atmosphere (for example, in a nitrogen stream). The polyamide used in the present invention may be a polyamide prepared by any method. The polyamide molded article for automobiles of the present invention can be manufactured by using the polyamide as described above as it is, for example, by using a melt molding method such as compression molding, injection molding, or extrusion molding. By adding glass fiber to the material, mechanical strength and heat resistance are improved, and cracks are less likely to occur especially when coming into contact with calcium chloride. [0026] Here, the average length of the glass fiber is
Usually 0.1 to 20 mm, preferably 0.3 to 6 mm
The aspect ratio is usually in the range of 10 to 2000.
, preferably in the range of 30 to 600. By blending such glass fibers, it is possible to obtain a molded product with good heat resistance properties such as heat distortion temperature, and mechanical properties such as tensile strength and bending strength, and in addition, it is possible to obtain a molded product with good mechanical properties such as tensile strength and bending strength. Cracks are less likely to occur even after repeated contact. Such glass fibers are
It is blended in an amount of 10 to 200 parts by weight, preferably 20 to 180 parts by weight, and more preferably 40 to 150 parts by weight, based on 100 parts by weight of polyamide. In other words, by blending glass fiber in the above amount, it is possible to ensure sufficient moldability to manufacture molded bodies with complex shapes such as molded bodies for automobiles, and also to improve mechanical properties and antifreeze properties. Properties such as crack resistance due to contact with the agent are improved. [0027] The molded article for an automobile of the present invention can be produced by mixing the polyamide as described above and further glass fiber if necessary, and then using a melt molding method such as compression molding, injection molding, or extrusion molding. I can do it. Specific examples of the automotive molded articles of the present invention include cylinder head covers, timing belt covers, oil reservoir tanks, radiator tanks, heater core tanks, water pump impellers, surge tanks, oil pans, gears, and fuse cases. , connectors, cooling fans, clutch spacers, bearing retainers, carburetors, hot water connectors, buffer rods, bushing cases, front air suspension chambers, steering wheel rack guides, air intake pipes and pedals. [0029] Effect of the invention: The polyamide molded article for automobiles of the present invention has the following properties:
It is made of polyamide containing a specific ratio of repeating units containing terephthalic acid component units and repeating units containing adipic acid component units, so it has excellent properties such as mechanical strength and heat resistance. In particular, cracks are less likely to occur due to repeated contact with gasoline or antifreeze agents. Furthermore, the polyamide molded article for automobiles of the present invention, which is formed from a composition in which glass fiber is blended with the above-mentioned polyamide, has particularly good crack resistance and exhibits particularly excellent properties as an automobile part. [0030] Next, the present invention will be described in detail with reference to Examples, but the present invention should not be construed as being limited by these Examples. Note that physical properties in the Examples and Comparative Examples shown below were measured by the following methods. - Tensile properties: In accordance with ASTM-D-638, strength at break and elongation were determined using a No. 4 dumbbell (thickness: 2 mm).・Bending strength: Size 3 according to ASTM-D-790
．． A bending test was conducted using a 2 mm x 12.7 mm x 127 mm test piece to determine the bending strength and bending elastic modulus. Heat resistance: Heat resistance was evaluated by measuring the heat distortion temperature of the test piece. Heat distortion temperature is ASTM-D
- Size 6.4mm x 12.7mm x 127m with bending stress of 18.6kg/cm3 in accordance with 648
m test piece was heated at 2℃ per hour, and the amount of deflection was 0.25.
The temperature was taken as the temperature when the thickness reached 4 mm.・Izod impact strength (with notch): A
Measured according to STM-D-256. - Calcium chloride resistance: A test piece with a width of 10 mm was cut out from a 4 x 120 x 130 mm square plate in the direction perpendicular to the gate (size 4 x 120 x 10 mm). After this test piece was pretreated in water at 80° C. for 24 hours, stress was applied to this test piece 1 using a jig as shown in FIG. As shown in Fig. 1, this jig consists of two fulcrums (radii of curvature R2, R2) placed at an interval of 100 mm, and a fulcrum (R5) placed at the midpoint between these two fulcrums. Become,
By loading the test piece into this jig, a strain of 4 mm is applied to the test piece by the central fulcrum. One cycle is a heat cycle in which a saturated calcium chloride aqueous solution is applied to the convex surface 2 of the test piece loaded in the jig as described above, heated to 100 ° C. for 2 hours, and then left at room temperature for 1 hour.
This test piece was subjected to a heat cycle. The surface condition of the test piece, that is, the presence or absence of cracks, was visually judged. - 85% methanol gasoline property: The test piece was mixed with a mixture of methanol and gasoline (mixing volume ratio = 85:
15) at 23° C. for 1000 hours, the bending strength and bending elastic modulus of this test piece were measured. [Example 1] Terephthalic acid (TA) 201g (1.21g
mol), adipic acid (AA) 144.7 g (0.99 mol), hexamethylene diamine (C6HA) 256.8
g (2.21 mol), sodium hypophosphite 0.47 g
(4.4 x 10-3 mol), benzoic acid 3.36 g (2.
75×10 −2 mol) and 146 g of ion-exchanged water were placed in a 1 liter autoclave, and after the autoclave was sufficiently purged with nitrogen gas, the temperature was raised to 280° C. over 4 hours with stirring. After the reaction was further carried out at 280° C. for 1 hour in the sealed state, stirring was stopped and the reaction product was extracted from the bottom of the autoclave. [0036] This reaction product was heated at 100°C in a nitrogen stream.
The mixture was dried under reduced pressure of 100 mmHg all day and night to obtain a lower condensate. Next, this low-order condensate was transferred to a twin-screw extruder (screw diameter 30 mm, L/D = 42, cylinder temperature 34 mm).
The polycondensation reaction was carried out in the molten state using vents to open the 4th, 6th, and 8th zones to the atmosphere, a rotation speed of 80 rpm, a low-order condensate supply rate = 2 kg/hour, and a nitrogen purge for the exhaust gas. Intrinsic viscosity (measured in concentrated sulfuric acid at 30°C) [η]
Polyamide pellets with a weight of 1.03 dl/g were obtained. The composition and physical properties of this polyamide are as follows. Repeating unit content of TA component units and C6HA component units: 55 mol% AA component units and C
Repeating unit content with 6HA component unit...
45 mol% intrinsic viscosity [η]

... 1.03dl/g melting point (10℃/
(Value determined by differential thermal analysis at a heating rate of minutes)...
Polyamide pellets as described above were heated at 312°C using an injection molding machine (IS-50 manufactured by Toshiba Machinery Co., Ltd.).
A test piece was injection molded under the following conditions. [Injection molding conditions] Cylinder temperature (°C): 310/320/320/32
0 injection pressure (Kg/cm2): primary/secondary = 1000/
800 Mold temperature (°C): 120 Tensile strength, elongation at break, IZ impact strength (23°C, with notch) and calcium chloride resistance were measured for the test piece thus produced. The results are shown in Table 1. [Example 2] In Example 1, among the polycondensation conditions, C6
A polyamide having an intrinsic viscosity [η] of 1.22 dl/g was prepared in the same manner except that the amount of HA used was changed to 258.2 g (2.22 mol). The composition and physical properties of this polyamide are as follows. Repeating unit content of TA component units and C6HA component units: 55 mol% AA component units and C
Repeating unit content with 6HA component unit...
45 mol% intrinsic viscosity [η]

... 1.22dl/g melting point (10℃/
(Value determined by differential thermal analysis at a heating rate of minutes)...
A test piece was prepared at 312°C in the same manner as in Example 1 except that this polyamide was used, and the tensile strength, elongation at break, and IZ impact strength of this test piece were measured. The results are shown in Table 1. [Example 3] In Example 1, among the polycondensation conditions, C6
A polyamide having an intrinsic viscosity [η] of 1.37 dl/g was prepared in the same manner except that the amount of HA used was changed to 259.4 g (2.23 mol). The composition and physical properties of this polyamide are as follows. Repeating unit content of TA component units and C6HA component units: 55 mol% AA component units and C
Repeating unit content with 6HA component unit...
45 mol% intrinsic viscosity [η]

... 1.37dl/g melting point (10℃/
(Value determined by differential thermal analysis at a heating rate of minutes)...
A test piece was prepared at 312°C in the same manner as in Example 1 except that this polyamide was used, and the tensile strength, elongation at break, and IZ impact strength of this test piece were measured. The results are shown in Table 1. [Example 4] In Example 1, among the polycondensation conditions, C6
A polyamide having an intrinsic viscosity [η] of 1.55 dl/g was prepared in the same manner except that the amount of HA used was changed to 260.7 (2.24 mol). The composition and physical properties of this polyamide are as follows. Repeating unit content of TA component units and C6HA component units: 55 mol% AA component units and C
Repeating unit content with 6HA component unit...
45 mol% intrinsic viscosity [η]

... 1.55dl/g melting point (10℃/
(Value determined by differential thermal analysis at a heating rate of minutes)...
A test piece was prepared at 312°C in the same manner as in Example 1 except that this polyamide was used, and the test piece was measured for tensile strength, elongation at break, IZ impact strength, and calcium chloride resistance. The results are shown in Table 1. [Comparative Example 1] In Example 1, among the polycondensation conditions, C6
A polyamide having an intrinsic viscosity [η] of 0.95 dl/g was prepared in the same manner except that the amount of HA used was changed to 255.6 g (2.2 mol). The composition and physical properties of this polyamide are as follows. Repeating unit content of TA component units and C6HA component units: 55 mol% AA component units and C
Repeating unit content with 6HA component unit...
45 mol% intrinsic viscosity [η]

... 0.95dl/g melting point (10℃/
(Value determined by differential thermal analysis at a heating rate of minutes)...
A test piece was prepared at 312°C in the same manner as in Example 1 except that this polyamide was used, and the tensile strength, elongation at break, and IZ impact strength of this test piece were measured. The results are shown in Table 1. Table 1 [Example 5] In Example 1, terephthalic acid (T
The amount of A) used was 109.6 g (0.66 mol), and the amount of adipic acid (AA) used was 225.1 g (1.54 mol).
The intrinsic viscosity [η] was set to 1.01d in the same manner except that it was changed to
l/g of polyamide was prepared. The composition and physical properties of this polyamide are as follows. Repeating unit content of TA component units and C6HA component units: 30 mol% AA component units and C
Repeating unit content with 6HA component unit...
70 mol% intrinsic viscosity [η]

... 1.01dl/g melting point (10℃/
(Value determined by differential thermal analysis at a heating rate of minutes)...
278°C Using this polyamide, a test piece was prepared in the same manner as in Example 1 except that the molding cylinder temperature (°C) was 290/300/300/300, and the tensile strength, elongation at break, IZ impact strength and calcium chloride resistance were measured. The results are shown in Table 2. [Example 6] In Example 5, among the polycondensation conditions, C6
A polyamide having an intrinsic viscosity [η] of 1.22 dl/g was prepared in the same manner except that the amount of HA used was changed to 258.2 g (2.22 mol). The composition and physical properties of this polyamide are as follows. Repeating unit content of TA component units and C6HA component units: 30 mol% AA component units and C
Repeating unit content with 6HA component unit...
70 mol% intrinsic viscosity [η]

... 1.18dl/g melting point (10℃/
(Value determined by differential thermal analysis at a heating rate of minutes)...
A test piece was prepared at 278°C in the same manner as in Example 5 except that this polyamide was used, and the tensile strength, elongation at break, and IZ impact strength of this test piece were measured. The results are shown in Table 2. [Example 7] In Example 5, among the polycondensation conditions, C6
A polyamide having an intrinsic viscosity [η] of 1.44 dl/g was prepared in the same manner except that the amount of HA used was changed to 259.4 (2.23 mol). The composition and physical properties of this polyamide are as follows. Repeating unit content of TA component units and C6HA component units: 30 mol% AA component units and C
Repeating unit content with 6HA component unit...
70 mol% intrinsic viscosity [η]

... 1.44dl/g melting point (10℃/
(Value determined by differential thermal analysis at a heating rate of minutes)...
A test piece was prepared at 278°C in the same manner as in Example 5 except that this polyamide was used, and the test piece was measured for tensile strength, elongation at break, IZ impact strength, and calcium chloride resistance. The results are shown in Table 2. [Comparative Example 2] In Example 5, among the polycondensation conditions, C6
A polyamide having an intrinsic viscosity [η] of 1.88 dl/g was prepared in the same manner except that the amount of HA used was changed to 255.6 (2.2 mol). The composition and physical properties of this polyamide are as follows. Repeating unit content of TA component units and C6HA component units: 30 mol% AA component units and C
Repeating unit content with 6HA component unit...
70 mol% intrinsic viscosity [η]

...0.88dl/g melting point (10℃/
(Value determined by differential thermal analysis at a temperature increase rate of 1 minute)...
A test piece was prepared at 278° C. in the same manner as in Example 5 except that this polyamide was used, and the test piece was measured for tensile strength, elongation at break, IZ impact strength, and calcium chloride resistance. The results are shown in Table 2. [Comparative Example 3] In Example 1, nylon 66 (CM3001N, manufactured by Toray Industries, Inc.) was used as the polyamide, and the molding cylinder temperature (°C) was changed to 270/280/280/
280, and a test piece was prepared in the same manner except that the mold temperature (° C.) was changed to 80. [0065] Regarding this test piece, tensile strength, elongation at break,
IZ impact strength and calcium chloride resistance were measured. The results are shown in Table 2. Table 2 [Example 8] Polyamide pellets prepared in Example 1 (
Intrinsic viscosity 1.03 dl/g) 67 per 100 parts by weight
Weight parts of glass fibers (average length = 3 mm, aspect ratio = 230, manufactured by Asahi Fiberglass Co., Ltd., chipped strand 03MAFT2A) were placed in a vented twin-screw extruder (
The mixture was supplied to a machine (manufactured by Ikegai Tekko Co., Ltd., model number PCM-45), mixed and extruded into a strand shape to prepare pellets of about 3 mm. A test piece was prepared in the same manner as in Example 1, except that the pellets prepared as described above were used instead of the polyamide pellets. The tensile strength, elongation at break, bending strength, bending modulus, IZ impact strength and HDT of this test piece were measured. The results are listed in Table 3. Furthermore, this test piece was evaluated for methanol gasoline resistance, and the results are shown in Table 5. [Example 9] In Example 8, the polyamide prepared in Example 2 (intrinsic viscosity 1.22 dl/g) was used instead of the polyamide prepared in Example 1 with an intrinsic viscosity of 1.03 dl/g.
) Glass fiber-containing pellets were prepared in the same manner except that the pellets were used, and test pieces were prepared using these pellets. The tensile strength, elongation at break, bending strength, bending modulus, IZ impact strength and HDT of this test piece were measured. The results are listed in Table 3. [Example 10] In Example 8, the polyamide prepared in Example 3 (intrinsic viscosity 1.37 dl/g) was used instead of the polyamide prepared in Example 1 with an intrinsic viscosity of 1.03 dl/g.
Glass fiber-containing pellets were prepared in the same manner except that g) was used, and test pieces were prepared using these pellets. The tensile strength, elongation at break, bending strength, bending modulus, IZ impact strength and HDT of this test piece were measured. The results are listed in Table 3. [Example 11] In Example 8, the polyamide prepared in Example 4 (intrinsic viscosity 1.55 dl/g) was used instead of the polyamide prepared in Example 1 with an intrinsic viscosity of 1.03 dl/g.
Glass fiber-containing pellets were prepared in the same manner except that g) was used, and test pieces were prepared using these pellets. The tensile strength, elongation at break, bending strength, bending modulus, IZ impact strength and HDT of this test piece were measured. The results are listed in Table 3. Furthermore, this test piece was evaluated for methanol gasoline resistance, and the results are shown in Table 5. [Comparative Example 4] In Example 8, the polyamide prepared in Comparative Example 1 (intrinsic viscosity 0.95 dl/g) was used instead of the polyamide prepared in Example 1 with an intrinsic viscosity of 1.03 dl/g.
) Glass fiber-containing pellets were prepared in the same manner except that the pellets were used, and test pieces were prepared using these pellets. The tensile strength, elongation at break, bending strength, bending modulus, IZ impact strength and HDT of this test piece were measured. The results are listed in Table 3. [0080] Table 3 [Example 12] In Example 8, the polyamide prepared in Example 5 (intrinsic viscosity 1.01 dl/g) was substituted for the polyamide prepared in Example 1 with an intrinsic viscosity of 1.03 dl/g. /
A glass fiber-containing pellet was prepared in the same manner except that g) was used, and a test piece was cut out using this pellet. The tensile strength, elongation at break, bending strength, bending modulus, IZ impact strength and HDT of this test piece were measured. The results are listed in Table 4. Furthermore, this test piece was evaluated for methanol gasoline resistance, and the results are shown in Table 5. [Example 13] In Example 8, the polyamide prepared in Example 6 (intrinsic viscosity 1.18 dl/g) was used instead of the polyamide prepared in Example 1 with an intrinsic viscosity of 1.03 dl/g.
A glass fiber-containing pellet was prepared in the same manner except that g) was used, and a test piece was cut out using this pellet. The tensile strength, elongation at break, bending strength, bending modulus, IZ impact strength and HDT of this test piece were measured. The results are listed in Table 4. [Example 14] In Example 8, the polyamide prepared in Example 7 (intrinsic viscosity 1.44 dl/g) was used instead of the polyamide prepared in Example 1 with an intrinsic viscosity of 1.03 dl/g.
A glass fiber-containing pellet was prepared in the same manner except that g) was used, and a test piece was cut out using this pellet. The tensile strength, elongation at break, bending strength, bending modulus, IZ impact strength and HDT of this test piece were measured. The results are listed in Table 4. Furthermore, this test piece was evaluated for methanol gasoline resistance, and the results are shown in Table 5. [Comparative Example 5] In Example 8, the polyamide prepared in Comparative Example 2 (intrinsic viscosity 0.88 dl/g) was used instead of the polyamide prepared in Example 1 with an intrinsic viscosity of 1.03 dl/g.
) A glass fiber-containing pellet was prepared in the same manner, except that the pellet was used, and a test piece was cut out using this pellet. The tensile strength, elongation at break, bending strength, bending modulus, IZ impact strength and HDT of this test piece were measured. The results are listed in Table 4. [Comparative Example 6] Commercially available glass fiber-containing nylon 66 (glass fiber content 30%, manufactured by Toray Industries, Inc., CM3001G3)
A test piece was prepared using 0). The tensile strength, elongation at break, bending strength, bending modulus, IZ impact strength and HDT of this test piece were measured. The results are listed in Table 4. Furthermore, this test piece was evaluated for methanol gasoline resistance, and the results are shown in Table 5. Table 4
Table 5

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing a jig for measuring calcium chloride resistance of a molded article.

[Explanation of symbols]

1... Test piece 2...Convex surface

Claims (2)

[Claims] Claim 1: 20 to 60 mol% of repeating units consisting of terephthalic acid component units and diamine component units containing hexamethylene diamine as the main component, and repeating units consisting of adipic acid component units and diamine component units containing hexamethylene diamine as the main component. composed of 40 to 80 mol% of repeating units, and has an intrinsic viscosity of 1.0 when measured in concentrated sulfuric acid at 30°C
A polyamide molded article for automobiles, characterized in that it is made of an aromatic polyamide having a content within the range of ~1.6 dl/g. 2. 20 to 60 mol% of repeating units consisting of terephthalic acid component units and diamine component units containing hexamethylene diamine as the main component, and repeating units consisting of adipic acid component units and diamine component units containing hexamethylene diamine as the main component. composed of 40 to 80 mol% of repeating units, and has an intrinsic viscosity of 1.0 when measured in concentrated sulfuric acid at 30°C
an aromatic polyamide within the range of ~1.6 dl/g;
10 to 20 parts by weight of the aromatic polyamide
1. A polyamide molded article for automobiles, characterized in that it consists of 0 parts by weight of glass fiber.