Polyamide resin compositions and building component parts

Abstract

To provide a polyamide resin composition and building component that can provide fire resistance and mechanical strength while suppressing defects in appearance. [Solution] The polyamide resin composition according to the present invention comprises 49.5% by weight or more and 69.5% by weight or less of polyamide resin, 30.0% by weight or more and less than 50.0% by weight of glass fiber, and 0.2% by weight or more and 0.5% by weight or less of an antioxidant.

Description

Technical Field

[0001] The present invention relates to a polyamide resin composition and a fitting part.

Background Art

[0002] Conventionally, in fittings provided between one space and another space, fitting parts such as door handles and pulls that are touched by a user when opening or closing one space and the other space are arranged. Such fittings, including the fitting parts, are required to have fire resistance and strength as performance (see, for example, Patent Document 1). A polyamide resin composition is known as a material for adding fire resistance to fitting parts (see, for example, Patent Document 2). The polyamide resin composition disclosed in Patent Document 2 enhances mechanical strength by blending an inorganic filler such as glass fiber.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in fitting parts, appearance defects due to glass floating may occur when using glass fiber.

[0005] In view of the above circumstances, an object of the present invention is to provide a polyamide resin composition and a fitting part that can impart fire resistance and mechanical strength while suppressing appearance defects.

Means for Solving the Problems

[0006] To achieve the above objective, the polyamide resin composition according to the present invention comprises 49.5% by weight or more and 69.5% by weight or less of polyamide resin, 30.0% by weight or more and less than 50.0% by weight of glass fibers, and 0.2% by weight or more and 0.5% by weight or less of an antioxidant.

[0007] Furthermore, the present invention further comprises a flame retardant in the polyamide resin composition described above, in an amount of 3.6% by weight or more and 8.0% by weight or less.

[0008] Furthermore, in the polyamide resin composition described above, the present invention provides that the flame retardant is a phosphate ester-based flame retardant having a limiting oxygen index of 20 or higher and a tensile strength of 170 MPa or higher.

[0009] Furthermore, in the polyamide resin composition described above, the glass fiber content is 40.0% by weight or less.

[0010] Furthermore, the building component according to the present invention is formed using the polyamide resin composition according to the above invention. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide fire resistance and mechanical strength to building components while suppressing defects in appearance. [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 is a plan view showing an example of the configuration of a building component according to an embodiment. [Figure 2] Figure 2 shows the flame retardant efficiency, safety, and suitability / unsuitability according to the RoHS Directive. [Modes for carrying out the invention]

[0013] Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as "embodiments") will be described with reference to the attached drawings.

[0014] (Embodiment) First, the building component according to the embodiment will be described. Figure 1 is a plan view showing an example of the configuration of the building component according to the embodiment. The building component 1 according to this embodiment is attached to the door panel of a door installed indoors and is held by the user when the door is opened or closed.

[0015] The door component 1 comprises a mounting portion 11 that is rotatably attached to the door panel, and a knob 12 that extends from the mounting portion 11 and is grasped by the user. When the door component 1 is attached to the door panel, rotating it relative to the door causes the latch bolt, which temporarily fastens the door, to move forward and backward relative to the door panel. The latch bolt is biased to protrude from the door edge surface of the door panel at all times, and when the door panel is closed, it functions to maintain the door panel in a closed state by engaging with an engagement hole in the door frame. By operating the knob 12 from this state, the latch bolt retracts into the door panel against the biasing force (latch bolt release operation), and the engagement between the latch bolt and the door frame is released, making it possible to open the door panel.

[0016] The joinery component 1 is formed using a polyamide resin composition containing polyamide resin, glass fibers, and an antioxidant.

[0017] The polyamide resin is the base material for the building component part 1, and polyamide 6 or polyamide 66 can be used. From the viewpoint of handling, the polyamide resin preferably has a relative viscosity η of 1.9 ≤ η ≤ 3.1 and a melting peak temperature of 210°C or higher and 280°C or lower. A relative viscosity η of 2.3 ≤ η ≤ 2.7 is more preferable. If the relative viscosity η is below 1.9, the resin may flow into the mold cut lines (PL) on the surface of the molded product, causing a defect in appearance. On the other hand, if the relative viscosity η is above 3.1, glass fibers are more likely to float to the surface, causing a defect in appearance. Furthermore, a melting peak temperature of 220°C or higher and 265°C or lower is more preferable. Glass fibers are incorporated as a reinforcing material in the building component 1.

[0018] The polyamide resin has a content of 49.5% by weight or more and 69.5% by weight or less based on the total weight of the polyamide resin composition. Further, the glass fiber has a content of 30.0% by weight or more and less than 50.0% by weight based on the total weight of the polyamide resin composition. If the content of the glass fiber is low (less than 30.0% by weight here), the strength will decrease, and if it is high (50% by weight or more here), there is a risk of causing poor appearance (generation of glass float) and deterioration of moldability. From the viewpoint of suppressing the generation of glass float more effectively, the glass fiber is preferably blended at 30% by weight or more and 40% by weight or less based on the total weight of the polyamide resin composition.

[0019] The content of the antioxidant is 0.2% by weight or more and 0.5% by weight or less. If the content of the antioxidant is low, it may decompose during kneading and injection molding, resulting in a decrease in performance. On the other hand, if the content is high, there is a risk of causing mold fouling during injection molding. The antioxidant can be used by combining a phosphite-based antioxidant and a phenol-based antioxidant, or each can be used alone.

[0020] In addition, the polyamide resin composition may be added with a silicone resin, a weathering agent, a flame retardant, etc. As the weathering agent, an ultraviolet absorber or a light stabilizer can be used.

[0021] As the flame retardant, a phosphate ester-based flame retardant, a non-diphenyl oxide-based flame retardant, a phosphorus-based non-halogenated flame retardant, or a melamine-based flame retardant can be used. From the viewpoint of improving fire resistance while suppressing a decrease in mechanical strength, the flame retardant is preferably added at 3.6% by weight or more and 8.0% by weight or less.

[0022] Figure 2 is a diagram showing the flame retardancy efficiency, safety, and suitability / inappropriateness of the Restriction of Hazardous Substances (RoHS) directive for flame retardants. In Figure 2, for various materials, those that are particularly preferable are marked with ◎, those that are preferable are marked with 〇, those that are somewhat inappropriate are marked with △, and those that are inappropriate are marked with ×. For the fitting part 1 according to this embodiment, from the viewpoints of flame retardancy efficiency, safety, and the RoHS directive, it can be said that it is preferable to use a phosphorus-based flame retardant among organic flame retardants as the flame retardant that is suitable in all items. Further, it is more preferable to use a phosphate ester-based flame retardant as the flame retardant. At this time, since the gas generated during combustion of halogen is harmful, it is not suitable for fittings, and it is preferable to be non-halogen. Among them, it is preferable that it is a phosphate-based one that is excellent in flame retardancy efficiency. Regarding inorganic systems, a large amount of additive is required to impart flame retardancy, which may deteriorate the product physical properties. Also, although red phosphorus can obtain the effect of flame retardancy with a small amount of addition, red phosphorus itself has flammability, so it is difficult to handle, and the color after kneading tends to become red, which may be restricted as a design.

[0023] When the fitting part 1 is used indoors, for example, in the polyamide resin composition, it is required that the Limiting Oxygen Index (LOI) as an index of flame retardancy is 20 or more, and the tensile strength as mechanical strength is 170 MPa or more. If the Limiting Oxygen Index is less than 20, there is a risk that the fireproof performance will be low. Also, if the tensile strength is less than 170 MPa, the strength of the fitting part 1 is insufficient, and there is a risk that it will be easily damaged. And the appearance is evaluated by visual inspection for the presence or absence of glass float, and it is desired that no glass float occurs. Therefore, similar characteristics are also required in the polyamide resin composition.

[0024] According to the embodiment described above, by blending polyamide resin, glass fiber, and antioxidant within the above ranges, a polyamide resin composition having fire resistance and mechanical strength while suppressing appearance defects can be obtained.

[0025] Furthermore, according to this embodiment, by adding silicone resin, weather-resistant agents, flame retardants, etc., in addition to polyamide resin, glass fibers, and antioxidants, a polyamide resin composition with further improved weather resistance and flame retardancy can be obtained.

[0026] It should be noted that the present invention is not limited to the embodiments described above. Configurations that appropriately combine the above-described components are also included in the present invention. Furthermore, further effects and modifications can be easily derived by those skilled in the art. Therefore, broader aspects of the present invention are not limited to the embodiments described above, and various modifications are possible. [Examples]

[0027] The present invention will be described in more detail below with reference to examples, but the present invention is not limited in any way by the following examples.

[0028] <Manufacturing conditions> [Condition C-11] Using a twin-screw extruder (TEX-25αIII: manufactured by Japan Steel Works Ltd.), glass fibers and flame retardants were added via a side feeder, melt-kneaded, extruded into strands, water-cooled, and pelletized in a pelletizer. The resulting pellets were dehumidified and dried at 110°C for 5 hours to obtain a polyamide resin composition. In the twin-screw extruder, the cylinders were arranged in 14 blocks (cylinders 1-14), with cylinders 2-8 set to 250°C and cylinders 9-14 set to 200°C. The discharge rate was 20 kg / hr and the screw rotation speed was 200 rpm. The materials were added in cylinder 2, which contained polyamide and an antioxidant, and in cylinder 9, which contained glass fiber.

[0029] [Condition C-21] The conditions were the same as in condition C-11, except that the set temperature for cylinders 2-14 was changed to 230°C. [Condition C-22] Except for setting the screw rotation speed to 100 rpm, the conditions were the same as those for condition C-21. [Condition C-23] Except for setting the screw rotation speed to 300 rpm, the conditions were the same as those for condition C-21.

[0030] [Condition C-31] The conditions were the same as in condition C-11, except that the set temperatures for cylinders 2-8 were changed to 230°C and for cylinders 9-14 to 220°C.

[0031] [Condition C-41] The cylinders were divided into 14 blocks, with cylinders 2-5 set to a temperature of 240°C, cylinder 6 set to 100°C, and cylinders 7-14 set to 220°C. The discharge rate was set to 30 kg / hr, and the screw rotation speed to 300 rpm. The materials used were polyamide and antioxidant in cylinder 1, and glass fiber and flame retardant in cylinder 6. [Condition C-42] Except for changing the discharge rate to 20 kg / hr and the screw rotation speed to 200 rpm, the conditions were the same as in condition C-41. [Condition C-43] The conditions were the same as in condition C-41, except that the discharge rate was changed to 20 kg / hr and the screw rotation speed to 400 rpm. [Condition C-44] Except for changing the set temperatures of cylinders 2-5 and 7-14 to 270°C, the conditions were the same as in condition C-41. [Condition C-45] The cylinders were divided into 14 blocks, with the set temperatures for cylinders 2-5 set to 280°C, cylinder 6 set to 250°C, and cylinders 7-14 set to 250°C. The discharge rate was set to 50 kg / hr, and the screw rotation speed to 500 rpm. The materials used were polyamide, antioxidant, and flame retardant in cylinder 1, and glass fiber in cylinder 6.

[0032] [Condition C-51] The cylinders were divided into 14 blocks, with cylinders 2-8 set to a temperature of 270°C, cylinder 9 set to 100°C, and cylinders 10-14 set to 270°C. The discharge rate was set to 30 kg / hr, and the screw rotation speed to 300 rpm. The materials were added as follows: polyamide and antioxidant were added to cylinder 1, and glass fiber (and flame retardant) was added to cylinder 6. [Condition C-52] The conditions were the same as in condition C-51, except that the set temperature of cylinder 9 was changed to 220°C. [Condition C-53] The conditions were the same as in condition C-51, except that the set temperature of cylinder 9 was changed to 270°C.

[0033] <Tensile strength, tensile elasticity, tensile strain> Using a testing machine (AG-Xplus (100kN): manufactured by Shimadzu Corporation), test specimens were molded in an injection molding machine (EC130SX: manufactured by Shibaura Machine Co., Ltd.) with a cylinder temperature of 280°C and a mold temperature of 80°C. Tensile strength, tensile elasticity, and tensile strain were measured in accordance with standards ISO-527-1 and ISO-527-2.

[0034] <Exterior Evaluation> Using the prepared polyamide resin composition, injection-molded flat plates with at least one surface having a smooth, mirror-like finish were created, and the presence or absence of glass detachment was evaluated by visual inspection.

[0035] <Impact Resistance Test> Using a digital impact tester (DG-UB: manufactured by Toyo Seiki Seisakusho Co., Ltd.), test pieces molded in an injection molding machine (EC130SX: manufactured by Shibaura Machine Co., Ltd.) at a cylinder temperature of 280°C and a mold temperature of 80°C were given an A-notch, and the Charpy value was measured in accordance with the Japanese Industrial Standard JIS K 7111-1.

[0036] <Flame retardancy test> Using a candle combustion test machine (AC3: manufactured by Toyo Seiki Seisakusho Co., Ltd.), test specimens were molded in an injection molding machine (EC130SX: manufactured by Shibaura Machine Co., Ltd.) at a cylinder temperature of 280°C and a mold temperature of 80°C. Oxygen index measurements were performed in accordance with Japanese Industrial Standard JIS K 7201-2, and the limiting oxygen index (LOI) was determined.

[0037] (Example 1) A polyamide resin molded product was prepared by mixing 59.5% by weight of polyamide 6 (TR-130BN, manufactured by Terabow Co., Ltd.; viscosity η = 2.51 Pa), 40% by weight of glass fiber (ECS3T-262H, manufactured by Nippon Electric Glass Co., Ltd.), 0.3% by weight of a phosphite-based antioxidant (PEP36, manufactured by ADEKA Corporation), and 0.2% by weight of a phenol-based antioxidant (AO80, manufactured by ADEKA Corporation) under condition C-11. In Example 1, when the weight of the polyamide resin is set to 100, the amount of glass fiber is approximately 43. The composition of the polyamide resin molded product in Example 1 and the test results are shown in Table 1.

[0038] [Table 1]

[0039] (Example 2) Example 2 used the same configuration and experimental method as Example 1, except that the weight ratio of polyamide 6 and glass fiber was changed. The composition of the polyamide resin composition in Example 2 and the test results are shown in Table 1.

[0040] (Example 3) Example 3 used the same configuration and experimental method as Example 1, except that the viscosity of polyamide 6 was changed to η=1.92 (TR-170BN manufactured by Terabow Co., Ltd.) and the weight ratio of polyamide 6 to glass fiber was changed. The composition of the polyamide resin composition in Example 3 and the test results are shown in Table 1.

[0041] (Example 4) Example 4 used the same configuration and experimental method as Example 1, except that the viscosity of polyamide 6 was changed to η=3.51 (TR-156BN manufactured by Terabow Co., Ltd.) and the weight ratio of polyamide 6 to glass fiber was changed. The composition of the polyamide resin composition in Example 4 and the test results are shown in Table 1.

[0042] (Example 5) Example 5 used the same configuration and experimental method as Example 1, except that the weight ratio of polyamide 6 and glass fiber was changed, weather-resistant agents (LA46 and LA52 manufactured by ADEKA Corporation) were added, and the manufacturing conditions were changed to condition C-21. The composition of the polyamide resin composition in Example 5 and the test results are shown in Table 1.

[0043] (Example 6) Example 6 used the same configuration and experimental method as Example 10, except that the manufacturing conditions were changed to condition C-22. The composition of the polyamide resin composition and the test results in Example 6 are shown in Table 1.

[0044] (Example 7) Example 7 used the same configuration and experimental method as Example 5, except that the manufacturing conditions were changed to condition C-23. The composition of the polyamide resin composition in Example 7 and the test results are shown in Table 1.

[0045] (Examples 8-14) Examples 8 to 14 used the same configuration and experimental method as Example 1, except that the weight ratio of polyamide 6 and glass fiber was changed, a flame retardant (SAYTEX8010 from Albemarle Japan Co., Ltd., PX-200 from Daihachi Chemical Industry Co., Ltd., or CM-6R from Yamato Chemical Industry Co., Ltd.) was added, and the manufacturing conditions were changed to condition C-21. The composition of the polyamide resin compositions and test results for Examples 8 to 14 are shown in Table 1.

[0046] (Examples 15-18) Examples 15-18 used the same configuration and experimental methods as Example 2, except that the weight ratio of polyamide 6 and glass fiber was changed, and a flame retardant (PX-200 manufactured by Daihachi Chemical Industry Co., Ltd., or CM-6R manufactured by Yamato Chemical Industry Co., Ltd.) was added. The composition of the polyamide resin compositions and test results for Examples 15-19 are shown in Table 1.

[0047] (Examples 19, 20) Examples 19 and 20 used the same configuration and experimental method as Example 2, except that the weight ratio of polyamide 6, glass fiber, and antioxidant was changed, a flame retardant (PX-200 manufactured by Daihachi Chemical Industry Co., Ltd.) was added, and the manufacturing conditions were changed to condition C-41. The composition of the polyamide resin compositions and test results for Examples 19 and 20 are shown in Table 2.

[0048] [Table 2]

[0049] (Example 21) Example 21 used the same configuration and experimental method as Example 19, except that a flame retardant (PX-200 manufactured by Daihachi Chemical Industry Co., Ltd.) was added and the manufacturing conditions were changed to condition C-42. The composition of the polyamide resin composition in Example 21 and the test results are shown in Table 2.

[0050] (Example 22) Example 22 used the same configuration and experimental method as Example 21, except that a flame retardant (PX-200 manufactured by Daihachi Chemical Industry Co., Ltd.) was added and the manufacturing conditions were changed to condition C-41. The composition of the polyamide resin composition in Example 22 and the test results are shown in Table 2.

[0051] (Example 23) Example 23 used the same configuration and experimental method as Example 19, except that a flame retardant (PX-200 manufactured by Daihachi Chemical Industry Co., Ltd.) was added and the manufacturing conditions were changed to condition C-43. The composition of the polyamide resin composition in Example 23 and the test results are shown in Table 2.

[0052] (Example 24) Example 24 used the same configuration and experimental method as Example 2, except that a flame retardant (PX-200 manufactured by Daihachi Chemical Industry Co., Ltd.) was added, the weight ratio of polyamide 6, glass fiber and antioxidant was changed, and the manufacturing conditions were changed to condition C-44. The composition of the polyamide resin composition in Example 24 and the test results are shown in Table 2.

[0053] (Example 25) Example 25 used the same configuration and experimental method as Example 1, except that the polyamide was changed to polyamide 66 (TR-520BN manufactured by Terabow Co., Ltd.), the weight ratio of polyamide, glass fiber, and antioxidant was changed, and the manufacturing conditions were changed to condition C-45. The composition of the polyamide resin composition in Example 25 and the test results are shown in Table 2.

[0054] (Example 26) Example 26 used the same configuration and experimental method as Example 2, except that the manufacturing conditions were changed to condition C-51. The composition of the polyamide resin composition and the test results in Example 26 are shown in Table 2.

[0055] (Examples 27-29) Examples 27-29 used the same configuration and experimental method as Example 26, except that the weight ratio of polyamide 6 was changed, a flame retardant (SAYTEX8010 from Albemarle Japan Co., Ltd. or Melapure200 / 70 from BASF Japan Ltd.) was added, and the manufacturing conditions were changed to condition C-52. The composition of the polyamide resin compositions and test results for Examples 27-29 are shown in Table 2.

[0056] (Examples 30-32) Examples 30 to 32 used the same configuration and experimental method as Example 26, except that the weight ratio of polyamide 6 was changed, a flame retardant (PX-200 manufactured by Daihachi Chemical Industry Co., Ltd., and / or Melapure 200 / 70 manufactured by BASF Japan Ltd.) was added, and the manufacturing conditions were changed to condition C-53. The composition of the polyamide resin compositions and test results for Examples 30 to 32 are shown in Table 2.

[0057] (Example 33) Example 33 used the same configuration and experimental method as Example 31, except that the weight ratio of polyamide 6 was changed, flame retardants (PX-200 manufactured by Daihachi Chemical Industry Co., Ltd. and Melapure 200 / 70 manufactured by BASF Japan Ltd.) were added, and the manufacturing conditions were changed to condition C-51. The composition of the polyamide resin composition in Example 33 and the test results are shown in Table 2.

[0058] (Examples 34-36) Examples 34 to 36 used the same configuration and experimental method as Example 35, except that the weight ratio of polyamide 6 and flame retardant (PX-200 manufactured by Daihachi Chemical Industry Co., Ltd.) was changed, and the manufacturing conditions were changed to condition C-53. The composition of the polyamide resin compositions and test results for Examples 34 to 36 are shown in Table 2.

[0059] (Example 37) Example 37 used the same configuration and experimental method as Example 36, except that the viscosity of polyamide 6 was changed to η=2.30 (TR-181BN manufactured by Terabow Co., Ltd.) and the manufacturing conditions were changed to condition C-52. The composition of the polyamide resin composition and the test results in Example 37 are shown in Table 2.

[0060] (Example 38) Example 38 used the same configuration and experimental method as Example 36, except that the viscosity of polyamide 6 was changed to η=3.00 (TR-157BN manufactured by Terabow Co., Ltd.) and the manufacturing conditions were changed to condition C-52. The composition of the polyamide resin composition and the test results in Example 38 are shown in Table 2.

[0061] (Comparative Example 1) Comparative Example 1 used the same configuration and experimental method as Example 1, except that the weight ratio of polyamide 6 and glass fiber was changed, with the weight ratio of glass fiber set to 50% by weight. The composition of the polyamide resin composition in Comparative Example 1 and the test results are shown in Table 3.

[0062] [Table 3]

[0063] (Reference example 1) As a reference example 1, Table 3 shows the physical properties of Commercial Material 1, a commercially available polyamide resin composition.

[0064] (Reference example 2) As a reference example 2, Table 3 shows the physical properties of Commercial Material 2, a commercially available polyamide resin composition.

[0065] (Reference example 3) As a reference example 3, Table 3 shows the physical properties of commercial material 3, which is a commercially available polyamide resin composition.

[0066] As can be seen from Comparative Example 1, if the polyamide resin composition contains 50% or more by weight of glass fibers, glass delamination occurs. Furthermore, as can be seen from Reference Examples 1 to 3, Examples 1 to 61 can be said to have strength and flame retardancy equivalent to commercially available polyamide resins. [Explanation of Symbols]

[0067] 1 Door / window component, 11 Mounting part, 12 Knob

Claims

1. A polyamide resin comprising 49.5% to 69.5% by weight, glass fiber comprising 30.0% to less than 50.0% by weight, and an antioxidant comprising 0.2% to 0.5% by weight. Polyamide resin composition.

2. 3. Further containing a flame retardant in an amount of 3.6% by weight or more and 8.0% by weight or less, The polyamide resin composition according to claim 1.

3. The aforementioned flame retardant is a phosphate ester-based flame retardant. The critical oxygen index is 20 or higher, and the tensile strength is 170 MPa or higher. The polyamide resin composition according to claim 2.

4. The glass fiber content is 40.0% by weight or less. The polyamide resin composition according to claim 1.

5. Formed using the polyamide resin composition described in claim 1, Parts for building fixtures.

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