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[0005] However, when a high-viscosity polyamide resin is used, although the sliding properties of the product are improved, its moldability, especially moldability at the time of injection, becomes very poor, whereby a complex mold in which metal or the like is inserted The fluidity in molded products, thin molded products, or composite molded products deteriorates, molding becomes difficult, and uses are limited
When a low-molecular compound such as a higher fatty acid is mixed in order to improve the moldability, although the moldability becomes slightly better, the mechanical strength of the molded product is significantly lowered than the advantage in the moldability, so this is not preferred
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[0040] Now, the present invention will be described more specifically by using the following examples, but the present invention is not limited to the examples.
[0041] The raw materials used in Examples and Comparative Examples of the present invention are as follows.
[0042] For the crystalline polyamide resin, the following (a) to (f) are used.
[0050] In addition, acid-modified PE [MME 001 (Grand Polypro)...
Embodiment 6
[0061] Example 6 is a composition in which the added amount of modified polyethylene was increased, but moldability, impact resistance, and sliding durability all had good results.
[0062] On the other hand, Comparative Example 1 is a composition in which the relative viscosity RV of polyamide 66 is low. Although the moldability was good, the sliding durability was poor, and significant removal of the surface occurred on the sliding surface. Due to the significant deterioration in this property, it cannot be used for a door opening limiter. Comparative Example 2 is a composition in which the relative viscosity RV of polyamide 6 is high, but in this system, fluidity is poor, whereby a door opening stopper cannot be produced and evaluation of sliding durability of an actual product cannot be performed. Comparative Examples 3 and 5 are compositions of the polyamide 66 system alone having a high relative viscosity, however, due to its poor moldability, sliding durability evaluat...
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Abstract
The invention provides moldings which retain excellent characteristics inherent in crystalline polyamide resin and which exhibit such high sliding durability that the appearance of the sliding surfaces little changes even after they have been slid tens of thousands of times under high load and are excellent in mechanical strengths and moldability. A crystalline polyamide based resin composition characterized by comprising 100 parts by weight of a crystalline polyamide resin composition comprising 50 to 90wt% of a crystalline polyamide resin (A) which exhibits a relative viscosity of 3.5 or above in a state dissolved in 96% sulfuric acid and 50 to 10wt% of a crystalline polyamide resin (B) which has a melting point lower than that of the resin (A) by at least 20 DEG C and exhibits a relative viscosity of 3.6 or below in a state dissolved in 96% sulfuric acid and 1 to 10 parts by weight of a modified polyolefin resin (C) which has functional groups reactive with end groups and / or backbone amido groups of the polyamide resins; and an automobile door checker characterized by being produced from the crystalline polyamide based resin composition.
Description
technical field [0001] The present invention relates to a crystalline polyamide-based resin composition comprising two crystalline polyamide resins having different relative viscosities and a modified polyolefin resin. More specifically, the present invention relates to a crystalline polyamide-based resin composition having excellent strength, rigidity, and moldability as well as good sliding durability, and which is particularly suitable as a mechanical device part requiring sliding properties, Examples include door checkers or gears in automobiles. Background technique [0002] Although polyamide resin has good sliding ability due to its crystallinity, many studies have been conducted to obtain better sliding characteristics, and studies have been made on the use of solid lubricants such as molybdenum disulfide, graphite, or fluororesins as well as liquid lubricants. Agents such as various lubricating oils or silicone oils are mainly used as slip improvers (Non-Patent Doc...
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