JPS5947218A - Curable resin composition - Google Patents

Abstract

PURPOSE:A curable resin composition excellent in impact resistance and suitable for obtaining a molding material solid at room temperature, containing an unsaturated polyester resin, a diallyl phthalate resin, butadiene-acrylonitrile and a copolymerizable vinyl monomer. CONSTITUTION:A composition containing (i) a resin component of an unsaturated polyester resin and a diallyl phthalate resin, (ii) 0.1-6pts.wt., per total composition, of active-vinyl group-terminated butadiene-acrylonitrile and (iii) 0.5- 10wt%, based on total composition, copolymerizable vinyl monomer. The unsaturated polyester used is preferably one which is solid at room temperature and preferably having a softening point of 60-120 deg.C. As the copolymerizable vinyl monomer, a monomer such as diallyl phthalate is more effective than a highly volatile monomer such as styrene.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a curable resin composition that has excellent impact resistance and is particularly suitable for obtaining a molding material that is solid at room temperature.

[Technical background of the invention and its problems]

Unsaturated polyester resin molding materials that are generally solid at room temperature in the form of granules or flakes are mixtures of solid unsaturated polyester resins, copolymerizable vinyl monomers, fillers, reinforcing agents, mold release agents, pigments, and curing catalysts. Kneaded by whole kneader, roll or continuous mixer, its excellent electrical properties,
Due to its heat resistance and tracking resistance, it is used in injection molding, transfer molding, and compression molding as electrical parts and automobile parts.

On the other hand, unsaturated polyester resin molding materials that are solid at room temperature tend to be inferior in strength to other molding materials using unsaturated polyester resins such as S, M, C and B, M, C. It is unsuitable for molded products that require strength or thin-walled molded products, and because the molded product itself is brittle, it
Chips and damage to molded products occur during processing and transportation, which is one of the causes of high defect rates.

[Purpose of the invention]

The purpose of the present invention is to provide a curable resin composition with excellent impact resistance that eliminates the drawbacks that are particularly apparent in molding materials that are solid at room temperature. This was completed as a result of intensive research to achieve this goal. That is, a mixed resin component of an unsaturated polyester resin and a diallyl slate resin, a 01 to 6 weight proportion of the total blended amount of the composition, and a bucdieneacrylic resin (IJ) having an active vinyl group at the terminal end. This curable resin composition is characterized in that it contains a copolymerizable vinyl monomer in an amount of 0.5 to 10% by weight based on the total amount of the composition as all essential components, and the strength is significantly increased even in a solid state at room temperature. , it is possible to obtain a molding abrasive having excellent storage stability.

The following are used as the unsaturated polyester resin and diallylphthale-1 resin, which is an essential component of the present invention.

As the unsaturated polyester resin, any unsaturated polyester can be used as long as it is obtained according to a conventional method using conventional unsaturated dibasic acids, saturated dibasic acids, and polyhydric alcohols, and there are no particular limitations on the unsaturated polyester resin. It is desirable that the softening point is 60 to 12oC. Diallyl phthalate 84 As the fat, all commonly used fats can be used.

Further, as the copolymerizable vinyl monomer which is an essential component of the present invention, it is more effective for rehabilitation than highly volatile monomers such as U- and diallyl phthalate monomer natocastyrene.

Further, as the bucdiene acrylonitrile which is another essential component of the present invention, only those having an active vinyl group at the end can be used. Butadiene acrylonitrile, which has an active vinyl group at the end, can be used in combination with the copolymerizable vinyl monomer described in section 2 to improve impact resistance. Bucdiene acrylonitrile used in the present invention contains an active vinyl group,
Therefore, since the crosslinking reaction easily occurs in the presence of a radical initiator, the decrease in water resistance and chemical resistance is very small compared to when butadiene acrylonitrile containing no active vinyl group is blended.

``If the amount of secondary bucdiene acrylonitrile exceeds 6% by weight in the total amount of the composition, or if the amount of copolymerizable vinyl monomer exceeds 10% by weight of the total amount of the composition, the ester Since the bonds remain unreacted, the appearance is significantly poor and the water resistance is lowered, which is undesirable.

In addition, the amount of butadiene acrylonitrile is less than 0.1v and the copolymerizable monomer is 0.5% by weight based on the total amount of the composition.
If it is less than 0.1 to 6% by weight of bucdiene acrylonitrile and 0.5% by weight of the copolymerizable vinyl monomer, the present invention will not be effective.
~10% by weight.

Curing catalysts are also used in the present invention, such as dicumyl peroxide, which have a decomposition temperature of 11 hours to obtain a half-life of 10 hours.
Any organic peroxide having a temperature of 0° C. or higher can be used.

As the filler, commonly used inorganic fillers such as calcium carbonate, aluminum hydroxide, and clay, and cellulose-based organic fillers such as pulp flock can be used.

Glass fibers are generally used as reinforcing agents, and organic fibers can also be used.

Zinc stearate is widely used as a mold release agent, but higher fatty acids or their esters are also used.

[Embodiments of the invention]

Examples of the present invention will be specifically described below.

Example 1 An unsaturated polyester resin having an acid value of 20 and a softening point (according to the ring and ball method) of 100° C. was obtained by a conventional method from 2.1 moles of propylene glycol, 08 moles of isophthalic acid, and 1.2 moles of maleic anhydride.

Next, (4) 160g of unsaturated polyester Aym resin
Diallyl phthalate prepolymer 65g Butadiene with vinyl terminals 15g Acrylic nitrile (acrylic vinyl groups 3.8% bound AN 16.2%) Diallyl phthalate monomer 20g Zinc stearate
15g carbon black (#30 manufactured by Mitsubishi Kasei) 5g dicumyl peroxide
Heat all 5g to 80°C and thoroughly homogenize with a double-arm kneader.
The mixture was kneaded until it became V-shaped, 120 g of 6 pieces of chopped glass fiber was added thereto, and after kneading for 10 minutes, the mixture was taken out from the kneader and extruded into pellets using an extruder to obtain a cut granular resin composition.

Δ Examples 2 to 3 The same operation as in Example 1 was carried out using the formulations shown in Table 1 to obtain granular resin compositions.

Comparative Examples 1 to 3 The same operation as in Example 1 was performed using the formulations shown in Table 1 to obtain granular resin compositions.

Table 1 Examples 1 to 3. Using a full injection molding machine, the resin compositions obtained in Comparative Examples 1 to 3 were molded at a mold temperature of 1.80°C and a pressure of 100°C.
Injection molding was performed under the conditions of K9/cl (gauge pressure) and curing time of 6 o seconds to obtain a molded product. Characteristics of this molded article were obtained and are shown in Table 2.

7- As is clear from the results in Table 2 above, the molded product using the resin acid of the present invention has higher Charpy impact strength and falling ball impact strength than the molded product using the resin composition of the comparative example. It was extremely excellent, and had properties equivalent to those of general unsaturated polyester molding materials in terms of electrical properties and water resistance.

〔Effect of the invention〕

As mentioned above, the curable resin composition of the present invention can significantly improve impact resistance by incorporating butadiene acrylonitrile having an active vinyl group at the end, and can also be molded into a thin wall. There was no "chipping" phenomenon and the defective rate could be significantly reduced.

Patent applicant: Toshiba Chemical Corporation Agent: Patent attorney Eiji Morota

Claims (1)

[Claims] 1 A mixed resin component of unsaturated polyester resin and diallylphtaleph φ1 resin, butadiene acrylonitrile having an active vinyl group at the end, which is blended in an amount of 01 to 6% by weight based on the total amount of the composition, and A curable resin composition comprising, as an essential component, a copolymerizable vinyl monomer in an amount of 0.5 to 10% by weight.