JP2000086759A5 - - Google Patents

Description

That is, in the present invention, 60 to 100 mol% of the dicarboxylic acid component is composed of terephthalic acid and an aliphatic dicarboxylic acid having 4 to 40 carbon atoms, and the ratio of terephthalic acid to the aliphatic dicarboxylic acid having 4 to 40 carbon atoms is by weight. A polyamide composed of a dicarboxylic acid component having a ratio of 50:50 to 90:10 and a diamine component in which 60 to 100 mol% of the diamine component is an aliphatic diamine having 9 carbon atoms , at 30 ° C. in concentrated sulfuric acid. It relates to a polyamide having a measured extreme viscosity [η] of 0.4 to 3.0 dl / g.
The present invention also relates to a polyamide composition obtained by blending 0.01 to 10 parts by weight of a crystal nucleating agent and / or 0.1 to 200 parts by weight of a filler with 100 parts by weight of the above-mentioned polyamide.
Furthermore, the present invention relates to a molded product made of the above-mentioned polyamide or polyamide composition.

Examples of the aliphatic dicarboxylic acid having 4 to 40 carbon atoms include malonic acid, dimethylmalonic acid, succinic acid, glutaric acid, adipic acid, 2-methyladipic acid, trimethyladipic acid, pimelic acid, and 2,2-dimethylglutar. acid, 2, 2 - diethyl succinate, azelaic acid, sebacic acid, suberic acid, etc. can be mentioned dimer acid may be used one or two or more of these aliphatic dicarboxylic acids. Among these aliphatic dicarboxylic acids, adipic acid, azelaic acid, and sebacic acid are preferable.

Other dicarboxylic acid components in the polyamide of the present invention include alicyclic dicarboxylic acids such as 1,3-cyclopentanedicarboxylic acid and 1,4-cyclohexanedicarboxylic acid; isophthalic acid, 2,6-naphthalenedicarboxylic acid, 2 , 7-naphthalenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 1,4-phenylenedioxydiacetic acid , 1,3-phenylenedioxydiacetic acid, diphenylic acid, 4,4'-oxydibenzoic acid, diphenylmethane-4 , 4'-dicarboxylic acid, diphenylsulfon-4,4'-dicarboxylic acid, aromatic dicarboxylic acid such as 4,4'-biphenyldicarboxylic acid, etc., and these can be used in one kind or two or more kinds. .. Among these, aromatic dicarboxylic acids such as isophthalic acid are preferably used. Further, polyvalent carboxylic acids such as trimellitic acid, trimesic acid and pyromellitic acid can be used within a range in which the obtained polyamide can be melt-molded.

The monocarboxylic acid that can be used as an end-capping agent is not particularly limited as long as it has reactivity with an amino group, but for example, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, capric acid, and laurin. cycloaliphatic monocarboxylic acids such as cyclohexanecarboxylic acid; acid, tridecyl acid, myristic acid, palmitic acid, stearic acid, pivalic acid, aliphatic monocarboxylic acids such as isobutyric acid benzoic acid, Tolui Le acid, alpha-naphthalene carboxylic Aromatic monocarboxylic acids such as acids, β-naphthalenecarboxylic acids, methylnaphthalenecarboxylic acids, phenylacetic acid, or any mixture thereof can be mentioned. Of these, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, caprylic acid, lauric acid, tridecylic acid, myristic acid, palmitic acid, stearic acid, etc. , Saprosylic acid is particularly preferred.

The polyamide of the present invention can be produced by using any method known as a method for producing a crystalline polyamide. For example, a solution polymerization method or interfacial polymerization method for the acid chloride and a diamine as raw materials; melt polymerization the dicarboxylic acid and diamine as raw materials, solid phase polymerization, can be produced by a method such as melt pressing Dekasane legitimate is there. Phosphoric acid, phosphorous acid, hypophosphorous acid, or salts thereof, and esters thereof, for the purpose of increasing the polycondensation rate and preventing the polyamide produced during polymerization from deteriorating during the production of polyamide. It is preferable to add a phosphorus-based catalyst such as the above to the reaction system. Of these, a hypophosphorous acid derivative is preferable from the viewpoint of the quality of the produced polyamide, and sodium hypophosphate is particularly preferable from the viewpoint of price and ease of handling. The amount of these phosphorus-based catalysts added is preferably 0.01 to 5% by weight, more preferably 0.05 to 2% by weight, and 0.07, based on the total weight of the dicarboxylic acid and diamine. It is particularly preferably ~ 1% by weight. The amount of the terminal encapsulant used varies depending on the reactivity, boiling point, reaction apparatus, reaction conditions, etc. of the end encapsulant used, but is usually 0 with respect to the total number of moles of the dicarboxylic acid and the diamine. It can be used in the range of 1 to 15 mol%.

Examples of the fibrous filler, for example, polyparaphenylene terephthalamide data Ruamido fibers, poly meta-phenylene terephthalamide fibers, polyparaphenylene isophthalamide fibers, polymetaphenylene isophthalamide fibers, condensate from diaminodiphenyl ether and terephthalic acid or isophthalic acid Total aromatic polyamide fibers such as fibers obtained from, or organic fibrous fillers such as total aromatic liquid crystal polyester fibers and vinylon fibers; or inorganics such as glass fibers, carbon fibers, alumina fibers, metal fibers and boron fibers. Examples include fibrous fillers of the system. When such a fibrous filler is blended, the molded product obtained from the polyamide composition is preferable because it not only has excellent sliding properties but also excellent mechanical properties, heat resistance properties, chemical physical properties and the like. .. These fibrous fillers preferably have an average length in the range of 0.05 to 50 mm. Further, it is more preferable to use one having an average length in the range of 1 to 10 mm in that the moldability is good and the obtained molded product has more excellent sliding characteristics, heat resistance characteristics and mechanical characteristics. These fibrous fillers may be secondarily processed into a cloth or the like.

Comparative Example 2
2290.9 g (13.79 mol) of terephthalic acid as a dicarboxylic acid component, 981.8 g (5.91 mol) of isophthalic acid, and 2324.2 g (20.00 mol) of 1,6-hexanediamine as a diamine component. also in a similar manner to that of example 1 except that had a 6.5 g of sodium hypophosphite monohydrate, an intrinsic viscosity [eta] was obtained polyamide 1.00 dl / g. This polyamide was pelletized using a twin-screw extruder having a cylinder temperature of 330 ° C., and an outgas test at the time of melting was performed. The results obtained are shown in Table 3. The pellets obtained by the above method are injection-molded at a cylinder temperature of 330 ° C. and a mold temperature of 80 ° C., and the obtained molded product is used for water absorption, tensile strength, strength retention after steam treatment, and after alcohol treatment. The strength retention rate and IZOD impact strength were measured. The results obtained are shown in Table 3. Further, the pellets obtained by the above method were press-molded at 330 ° C., and the obtained press film was used to measure the calorific value of crystallization after quenching. The results obtained are shown in Table 3.