JPH01304106A - Curing agent for putty composition - Google Patents

Abstract

PURPOSE:To prepare a good curing agent having an extremely high workability by filling a ketone peroxide and a acyl peroxide divided by a partition wall in a container and extruding these two liq. from this container and mixing them when they are used. CONSTITUTION:A ketone peroxide 2 and an acyl peroxide 2' are filled in a container 1 divided by a partition wall 3 and, when they are used, these two liq. 2 and 2' are extruded from the container 1 by, e.g., pushing a pushing bar 5 against plungers 4 and mixed together. The ketone peroxide and the acyl peroxide have each a defect as a curing agent, but when they are simultaneously used, only their merits are exhibited. However, when they are mixed together, the lifecycle as a curing agent becomes short and it is therefore necessary to keep them at a cool and dark place. It is possible to make a good curing agent having an extremely high workability by using a container having a partition wall.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field to which the invention pertains) The present invention provides a curing agent that has extremely good workability when a putty composition is actually used.

(Description of Prior Art) Conventional putty compositions are composed of a base material made of unsaturated polyester mixed with a filler and a hardening agent made of peroxide paste.

As a peroxide, methyl ethyl ketone peroxide,
Ketone peroxides such as methyl isobutyl ketone peroxide, cyclohexanone peroxide, and methyl cyclohexanone peroxide, and acyl peroxides such as benzoyl peroxide are commonly used. To cure at room temperature using a redox catalyst, ketone peroxides use a cobalt salt such as cobalt naphthenate as a catalyst, and acyl peroxides use an amine compound such as dimethylaniline as a catalyst. This combination exhibits properties as a putty composition, and when benzoyl peroxide is used, adhesion to the adherend is good, but staining of the painted surface due to the catalytic amine occurs. In addition, when the putty hardens, tack remains on the surface that adheres to the air, making it difficult to become tack-free.When using a ketone-based peroxide, the adhesion to the adherend is slightly inferior to that of an acyl-based putty, but the adhesiveness remains on the painted surface. Contamination is rare, and the tack-free surface of the para surface after curing is faster than that of acyl-based materials, but the reaction is slow, so the rise in hardness is slow.The present invention solves these conventional problems. The object of the present invention is to provide a good curing agent which solves the above problems and also significantly improves workability.

(Structure of the Invention) The present invention is characterized in that a single container is filled with a ketone peroxide and an acyl peroxide with a partition wall between them, and when used, the two liquids are discharged from the container and mixed. The present invention relates to a characteristic curing agent for putty compositions.

The above-mentioned penetrating ketone peroxide and acyl peroxide each have their drawbacks as hardeners, but when we pursued a method of using them simultaneously, we found that only the advantages of both were cursed, and that the conventional automotive repair putty It was found that the properties of the material were significantly improved. However, when a ketone peroxide and an acyl peroxide are mixed, the life cycle of the curing agent is shortened, and storage in a cool, dark place is required for commercialization.

In addition, if the hardening agent is placed in separate containers, it will require two steps instead of one, which not only increases the amount of work required, but also reduces the amount of hardening agent measured by half compared to the conventional method, resulting in a decrease in measurement accuracy and a reduction in the quality of the putty composition. There are also problems with the quality of

The present invention solved this problem by using a container with partition walls, and succeeded in producing a good curing agent with extremely high workability.

A piston method and a squeezing method are conceivable as methods for simultaneously taking out each substance from a container with a partition wall.

For the piston type, the container is made of polyethylene or polypropylene, which is a material that does not easily deform. In addition, in the squeezing method, the container is made of a film-like material such as polyethylene or polypropylene, which is easily deformable.

To explain the embodiment, 1 is a container body (with a screw cap), and by pressing an extrusion rod 5 against a plunger 4, a curing agent 2.2 is introduced from the opposite tip of 1 across a partition wall 3. ' will appear.

In the case of a film-like container, when in use, the mouth of the container is opened at the notch 7 of the film heat-sealing section 6, and the film is squeezed by rotating the winding handle 10 from the end sealed with the plastic jigs 8 and 9. At the same time, the curing agent is discharged from the extrusion port, mixed, and used as a curing agent for the putty composition.

(Description of Examples and Comparative Examples) Next, the present invention will be specifically described with reference to Examples and Comparative Examples.

Example 1. Unsaturated polyester resin Polyset 171
4B (manufactured by Hitachi Chemical KK) 40% by weight, imported talc TALC8P (manufactured by Nippon Talc KK) 30% by weight ultrafine particle calcium carbonate MS-100 (manufactured by Nitto Funka Kogyo KK) 30% by weight and hardening accelerator C
5% by weight of T-13 (manufactured by Hitachi Chemical Co., Ltd. KK) was mixed until uniform to form a main ingredient. Using the container shown in FIG. 1, one portion each of benzyl peroxide Nyver BO (manufactured by NOF KK) and ketone peroxide Perhexa D (manufactured by NOF KK) was added to 100% by weight of the main ingredient of this putty composition. The weight percentages were mixed and the properties were investigated. The results are shown in Table 1.

Comparative example 1. 2 weight percent of Niper BO was mixed with 100 weight percent of the base material prepared in Example 1,
We investigated the characteristics. The results are shown in Table 1.

Comparative example 2. 2% by weight of Perhexa D was mixed with 100% by weight of the base material prepared in Example 1,
We investigated the characteristics. The results are shown in Table 1.

Comparative example 3. To 100 weight percent of the base resin prepared in Example 1, 2 weight percent of a hardening agent in a polyethylene tube containing equal proportions of Niper BO and Perhexa D was mixed and the properties were investigated.

The results are shown in Table 1.

Notes> (1) Evaluation of adhesiveness: 0: Cohesive failure of putty layer, Δ: Mixed failure, ×: Interfacial peeling (2) Evaluation of heat and humidity resistance: Adhesion °
The test pieces were left at 50° C. and 95% RH for 10 hours, and evaluated in the same way as for adhesiveness.

(3) Evaluation of drying properties: The putty was cured at 20°C, and the surface tack to the touch was examined 20 minutes after curing.

0: Tough free Δ: Slight tack ×: Tack (
Effects of the present invention) As described above, the curing agent for putty compositions of the present invention solves the shortcomings of the prior art related to this problem, and provides an extremely good putty composition.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the invention, FIG. 2 is a plan view of the invention, and FIG. 3 is a front view of the invention. 1... Container body (with screw cap) 2... Ketone peroxide or acyl peroxide 2' ・
・ 3... Partition wall 4... Plunger 5... Extrusion rod 6... Film heat sealing part 7... Notch 8... Plastic jig (male type) for closing the film end 9...・Plastic jig (female type) for closing the film end 10... Winding handle or more

Claims (1)

[Claims] A hardening agent for a putty composition, characterized in that a container is filled with a ketone peroxide and an acyl peroxide with a partition wall between them, and when used, the two liquids are discharged from the container and mixed.