JPS60248775A - Resin composition - Google Patents

Abstract

PURPOSE:To obtain a resin composition having excellent moldability and high impact strength while keeping the excellent characteristics such as mechanical properties, etc. of the base resin, by adding a specific amount of nylon-12 resin to nylon 4,6 resin. CONSTITUTION:100pts.wt. of a nylon 4,6 resin having an intrinsic viscosity of 1.10-1.90, preferably 1.30-1.70 at 35 deg.C in m-cresol is compounded with 5- 100pts.wt. of a nylon-12 resin.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a resin composition, and more particularly to a nylon resin composition exhibiting excellent moldability and high impact strength.

[Prior art] Nylon-4 made from tetramethylene diamine or its functional derivative and adipic acid or its functional derivative
, 6 resins have been known for a long time.

This nylon-4,6 resin has excellent mechanical strength such as tensile strength 2 bending strength and impact strength, as well as excellent heat resistance and sliding properties, so it has great utility as a useful engineering plastic. It is believed that.

However, nylon-4,6 resin has a high melting point of about 290°C and thermal decomposition occurs at about 320°C, so it has the disadvantage that the temperature range suitable for molding is narrow.

In general, moldability is important when evaluating polymers, especially plastics. Even if the product itself has excellent properties, if the molding condition range is narrow, it will not only be impossible to economically manufacture the product, but also Its excellent properties are not fully demonstrated in the product. For example, when making a product by injection molding using a polymer with a high softening temperature, high melting point, and high melt viscosity, a high plasticizing temperature, high injection pressure, and high mold temperature are required, which leads to high costs. In addition, high plasticizing temperatures can induce thermal decomposition of polymers, high injection pressure can cause distortion in products, and when these harsh conditions are violated, shorts, sink marks, flow marks, etc. This causes a fatal defect in appearance, and the mechanical strength also deteriorates considerably.

[Object of the invention] The present invention was made against the background of the above-mentioned circumstances, and
The purpose is to maintain the excellent properties of nylon-4,6 resin while improving its moldability.

[Structure of the Invention] As a result of intensive research by the present inventors to improve the moldability of nylon-4,6 resin, a composition in which a specific amount of a specific polymer is blended with nylon-4,681 resin has been developed to achieve the above-mentioned purpose. matches,
Moreover, it was discovered that a specific improvement in impact strength that could not be estimated from the individual components constituting the composition was observed, and the present invention was achieved based on this finding.

That is, the resin composition of the present invention comprises (A) nylon-4,6
(B) Nylon-12 resin 5 to 1 per 100 parts by weight of resin
00 parts by weight of the resin composition.

Used in the present invention (A> component nylon-4,
6 resin is mainly a polyamide obtained by a condensation reaction using adipic acid or its functional derivative as the acid component and tetramethylene diamine or its functional derivative as the amine component, but the adipic acid component or tetramethylene diamine It is also possible to replace some of the components with other copolymer components.

A preferred embodiment of the method for manufacturing nylon-4,6 wood is disclosed in JP-A-56-149430 and JP-A-56-14.
It is described in Publication No. 9431.

The intrinsic viscosity of the nylon-4,6 resin used in the present invention is 1.10 when measured at 35°C using m-cresol.
-1.90, more preferably in the range of 1.30-1.70.

When a nylon-4,6 resin with an intrinsic viscosity exceeding 1.90 is used, the effect of improving the fluidity of the composition is weak, and the resulting molded product not only loses its glossy appearance but also has poor mechanical and thermal properties. This is not preferable because it increases the variation in properties.

On the other hand, if the intrinsic viscosity is lower than 1.10, the mechanical strength of the composition becomes low.

Nylon-12 as component (B) used in the present invention
The resin to be used is one having a relative viscosity of 1.0 to 2.5 obtained by ring-opening polymerization of ω-laurin lactam.

In the present invention, a resin composition containing 5 to 100 parts by weight of nylon-12 resin per 100 parts by weight of nylon-4,6 resin is more effective during injection molding than a nylon-4,6 resin alone. The plasticization temperature can be significantly lowered, thereby making it possible to mold the resin over a wide molding temperature range without causing thermal decomposition of the resin.

The blended amount of nylon-12 resin exceeds 100 parts by weight.
In this case, a lower plasticizing temperature is expected in terms of molding temperature, but this results in the loss of the excellent heat resistance and mechanical strength that nylon-4,6 resin inherently has, so there is no practical advantage. You won't even be able to have sex. On the other hand, when the blending amount is less than 5 parts by weight, the desired effect of improving moldability is hardly obtained.

The composition of the present invention has a blending amount of nylon-12 resin of about 3
It has been found that it has a uniquely high notched impact strength when the amount is 0 parts by weight.

The impact strength was higher than the impact strength of any component of the composition alone, which was a completely unexpected phenomenon.

Pigments and other compounding agents may be added to the resin composition of the present invention in the desired amount. Such additives include fillers such as glass fibers.

Asbestos, carbon fiber, aromatic polyamide fiber.

Potassium titanate ai1. Fibrous materials such as steel fibers, ceramic fibers, boron whiskers, etc.; Powdered materials such as mica, silica, calcium tartau carbonate, glass peas, glass flakes, clay, wollastonite, etc.
Granular or plate-shaped inorganic fillers are exemplified.

These fillers are usually used as reinforcing materials 9 as surface modifiers.
Alternatively, it may be blended for the purpose of modifying electrical, thermal, or other properties, but it should be blended within the minimum amount that produces the effect of addition and within the range that does not cause the composition to lose its original excellent properties and molding advantages due to excessive addition. Should.

Furthermore, flame retardants such as brominated biphenyl ethers.

Halogen-containing compounds such as brominated bisphenol-A diglycidyl ether and its oligomers, polycarbonate oligomers produced using brominated bisphenol-8 as raw materials: Red phosphorus, phosphorus compounds such as triphenyl phosphate: Phosphorus mononitrogen such as phosphonic acid amide Compounds, etc.; flame retardant aids such as antimony trioxide, zinc borate, etc. can be added. In addition, for the purpose of improving heat resistance, hindered phenol compounds, organic phosphorus compounds,
Antioxidants or heat stabilizers such as sulfur compounds and the like may also be added. Furthermore, various epoxy compounds may be added for the purpose of improving melt viscosity longitudinal stability, hydrolysis resistance, etc. Examples of epoxy compounds include bisphenol A
Bisphenol A type epoxy compounds obtained by reacting with epichlorohydrin, various glycols, aliphatic glycidyl ethers obtained by reacting glycerol with epichlorohydrin, novolac type epoxy compounds, aromatic or aliphatic carboxylic acid type epoxy compounds, alicyclic compounds Alicyclic compound type epoxy compounds obtained from the above are preferred, and particularly preferred epoxy compounds include bisphenol A type epoxy compounds and diglycidyl ether of low molecular weight polyethylene glycol.

In addition, stabilizers 2, colorants, antioxidants, lubricants, ultraviolet absorbers, and antistatic agents can also be added.

In addition, other thermoplastic resins 9 such as styrene resin, acrylic resin, polyethylene, polypropylene,
Fluororesins, other polyamide resins, polycarbonate resins, polysulfone, etc.; thermosetting resins such as phenolic resins, melamine resins, unsaturated polyester resins, silicone resins, etc.; and soft thermoplastic resins such as ethylene-vinyl acetate copolymers, polyesters, etc. Elastomers, ethylene-propylene terpolymers, etc. may also be added.

Any compounding force/method can be used to obtain the resin composition of the present invention.

Generally, it is preferable to disperse these ingredients more uniformly, and a method or method of homogenizing by mixing all or part of them simultaneously or separately using a mixer such as a blender, kneader, roll, or inserter, etc. Using a method of mixing some of the components simultaneously or separately using a blender, kneader, roll, inserter, etc., and then mixing the remaining components with these mixers or inserters for homogenization. I can do it. Furthermore, there is a method in which a pre-triblended composition is melt-kneaded in a heated extruder to homogenize it, extruded into a wire shape, and then cut into a desired length and granulated. The molding composition and product thus produced are normally kept in a sufficiently dry state before being put into a molding machine hopper and subjected to molding. Furthermore, it is also possible to tri-blend the constituent raw materials of the composition, directly charge the mixture into the hopper of a molding machine, and melt-knead the mixture in the molding machine.

[Example] The present invention will be explained in detail with reference to Examples below.

In addition, various characteristics in the examples were measured by the following methods.

(1) Static strength: Tensile test: Based on ASTM D-638.

Impact strength...A S T M D -256 (
(With Izotsunotch) (a Heat deformation temperature: Load 264 ps by ASTM D-648
Measured at i.

Examples 1 to 8 and Comparative Examples 1 to 6 Nylon-4,6 resin with intrinsic viscosity (m-cresol, 35°C > 1.67, dried at 110°C for 8 hours under reduced pressure at IOT Orr (rsTANYLJ, DSM, Netherlands) (manufactured by Daicel-Hüls) and a nylon-12 resin ([Diamide Immediately after homogenization, 13
The sample was placed in the hopper of a 5-ounce injection molding machine heated to 0° C., and a mold for a test piece for measuring physical properties was attached to perform molding.

The molding conditions were as follows.

Molding temperature = 250-320℃, mold temperature = 60℃, injection pressure 600Kg/cm, back pressure: 20Kg/
cM, cooling time: 20 seconds and total cycle 35 seconds.

The mechanical strength, heat distortion temperature, and appearance of the molded product thus obtained were measured.

These results are shown in Table-1.

As is clear from the results in Table 1, when molding nylon-4,6 resin, good molded products can only be obtained when the molding temperature is within an extremely narrow range of 290 to 300°C (Comparative Examples 2 to 3).
3) At a higher temperature of 320° C., the resin decomposes and the resin flows violently during molding, causing a so-called sagging phenomenon, making molding impossible (Comparative Example 1).

On the other hand, when the molding temperature is 280°C, plasticization is insufficient, fluidity is poor, and the molded product becomes a short shot (Comparative Example 4).
).

In contrast, nylon-12, which is component (B) of the present invention,
A composition containing 25 parts by weight of resin mixed with 75 parts by weight of nylon-4,6 resin can be molded in a temperature range of 270 to 300°C (Examples 2 to 4).

Examples 6 to 8 are embodiments in which the composition ratios of (A>component and (B) component) of the present invention were changed.

In both of these cases, when nylon-4,6 resin is used alone, it is insufficiently plasticized and the molding temperature 2 is substantially non-flowing.
It is fully moldable at 80°C, and maintains fairly high values for both mechanical strength and heat distortion temperature.

In particular, the impact strength of the embodiments of Examples 3 and 6 was significantly higher than that of nylon-4,6 resin alone,
Nylon-4,6 resin with specific i7B percentage
A specific increase in impact strength was observed by blending No. 12 resin.

However, Comparative Example 5, in which a larger amount of nylon-12 resin was blended, exhibited properties close to those of nylon-12 resin (Comparative Example 6),
It was not possible to exhibit the properties of nylon-4°6 resin, which has excellent mechanical and thermal properties.

[Effects of the Invention] As detailed above, the composition of the present invention is made of nylon-4,6
By blending a specific amount of nylon-12 resin with the resin, the excellent properties of nylon-4,6 resin can be utilized while significantly improving the moldability, which is the drawback of nylon-4,6 resin.

Claims (1)

[Claims] 1. (A) Nylon-4,6 resin Per 100 parts by weight (B) Nylon-12 resin Contains 5 to 100 multi-question sections A resin composition characterized by: