JPS59191744A - Production of powder-containing resin particle - Google Patents

Abstract

PURPOSE:To form powder-containing resin particles which gives a resin foam contg. powder uniformly dispersed therein, by stirring a foaming resin, water and a powder at a high speed in a treating tank. CONSTITUTION:Water 10 from a feed port 3 and a raw resin 11 such as styrene monomer from a feed port 2 are filled in a treating tank 1 to a height of the half thereof. While rotating a propeller 6 at a high speed, a powder (obtd. by combining a hairy urea resin with a metallic powder by baking) in a quantity of 3-20% based on that of the raw resin is fed through a feed port 4 thereto, and stirring is carried out for 10-20hr. Styrene monomer particles having a sesame grain size formed in the tank 1 is taken out and water is removed therefrom. The resulting particulate resin is expansion-molded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing resin particles that can uniformly distribute powder in a resin foam.

Currently, in resin foam molded products, foams are formed by expanding the resin particles that serve as the raw material, but it is also possible to uniformly distribute and interpose other substances, such as carbon powder, into the foam. It is. This combines the extremely light properties of the resin foam itself with the properties of the intervening material to create members with special properties, such as extremely light members with a high dielectric constant, or members that are light but relatively robust. Formation is taking place.

Specifically, this method involves entangling, for example, carbon powder in a primary foam made by primary foaming a particulate resin raw material.
This is carried out by foam molding, but this method is very time consuming and has the problem that a uniform product cannot be obtained. Furthermore, a method has been considered in which the powder is entangled with the primary foam using a solvent, but during foam molding, this solvent adheres to the nozzle that blows the primary foam into the mold, preventing the ejection of the secondary foam. It has the disadvantage of being a hindrance.

The present invention has been made in view of the above-mentioned circumstances, and it solves the above-mentioned problems by applying a special treatment to the resin particles in the previous stage, instead of treating the powder to the next foam. It is an object of the present invention to provide a method for producing resin particles that yield a resin foam molded article having uniform distribution.

That is, the present invention is characterized in that resin raw materials for foaming, water, and powder to be treated are supplied to a processing tank, and these are agitated at high speed to form particulate resin mixed with powder. This is a method for producing resin particles containing powder.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The figure is an explanatory diagram conceptually showing an example of an apparatus for carrying out the method of the present invention. 1 is a processing tank, 2 is a resin raw material supply port provided above the processing tank 1, 3 is a water supply port, 4 is a powder supply port, and 5 is a processing port provided at the bottom of the processing tank 1. The finished raw material discharge port 6 is a stirring propeller.

The present invention is carried out using this apparatus in the following manner. Water is supplied into the treatment tank 1 through the water supply port 3. Further, the resin raw material is similarly supplied through the raw material supply port 2. 10 indicates the supplied water, and 11 indicates the supplied resin raw material. In this embodiment, the processing tank 1 has a capacity of (9) to 60 -, and is filled with 1 liter of water and the resin raw material 11 at half capacity. This resin raw material 11 uses, for example, a styrene monomer, and the styrene monomer IK: 1. , water is used at a ratio of 1 to 2 (volume ratio). The figure shows the state before stirring.

Next, while supplying a predetermined amount of powder to be treated from the powder supply port 4, the propeller 6 is rotated at high speed and stirring is performed for 10 to 20 hours. In this example, a hair-like urea resin powder baked with metal powder, such as copper powder or iron oxide, was supplied as a powder at a ratio of 3 to 20 parts per 1 part of styrene monomer.

The above treatment generates sesame-sized particles of styrene monomer in the treatment tank 1. This may be taken out from the discharge port 5 and subjected to a centrifugal separator (not shown) to separate water and particles.

The particulate resin thus obtained can be processed by a conventional process.
What is necessary is just to provide for foam molding using a means. For example, after performing secondary foaming using these resin particles, the secondary foaming particles may be used to foam mold a suitable product.

Foam molded products made using powder-treated resin particles produced by the above method have a uniform distribution of powder in each foam [2] compared to products made by conventional methods. A high quality product was obtained. For example, a product using urea resin with metal powder as the powder is light and has a uniform dielectric constant, and a product using cement powder as the powder is light and each foam is formed uniformly and strongly. Some parts were replaced. There is no need for the conventional process of processing powder into resin particles.

[Brief explanation of the drawing]

The figure is a conceptual explanatory diagram of an apparatus used in the method of the present invention. 1... Processing tank, 2... Resin raw material supply port, 3... Water supply port, 4...
- Powder supply port, 6... Propeller for stirring. 5-26

Claims (1)

[Claims] A resin containing powder characterized by supplying resin raw materials for foaming, water, and powder to be treated to a processing tank, and stirring these at high speed to form particulate resin mixed with powder. Method of manufacturing particles.