JPH0471664A - Method for preventing splashing of fine powder and fine powder subjected to treatment to prevent splashing by this method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for preventing the scattering of hollow plastic fine powder, which scatters violently and is difficult to handle, and to a fine powder treated to prevent scattering by the method.

[Prior Art] Fine powdered silica and fine plastic powder are extremely lightweight, so they are used in large quantities as fillers in paints and plastics.

Recently, hollow plastic fine powder, which is even lighter than plastic fine powder, has been used as a filler for paints, plastics, and the like.

Such lightweight hollow plastic fine powder is mainly used for the purpose of reducing the weight of fillers such as plastic paints.

[Problem to be Solved by the Invention 1] The use of hollow plastic fine powder as a filler for paints and plastics is very effective because it can improve the durability and reduce the weight of coating materials and plastic molding materials.

Hollow plastic fine powder is usually stored in containers such as plastic bags or container bags, but when it is mixed into a base material, if it is taken out of the container, it will fly up into the air, making it difficult to mix and pose a risk to workplaces and the human body. It was highly contaminated and difficult to handle.

In particular, for hydrophobic hollow plastic fine powder, containers (
When putting it into a mixer from a bag, it flies up into the air and is difficult to handle. In addition, with normal agitation and mixing, the wet areas become heavy, so they may separate and cannot be mixed, or it may take a considerable amount of time. It required

The present inventors have conducted various studies to solve the above-mentioned problems, and as a result, a processing solution is directly added to the hollow plastic fine powder contained in the container without taking it out. At this time, by spraying the processing solution onto the hollow plastic fine powder from an airless spray device, and by utilizing the fact that the fine powder flows due to the action of the processing solution, the fine powder is uniformly wetted and dispersed in a very short time. The present invention was developed based on the knowledge that this property is lost.

[Means for Solving the Problems] That is, the present invention provides a method for preventing scattering of fine powder, characterized in that a liquid substance is injected onto hollow plastic fine powder in a container from an airless spray device, and a method for preventing scattering of fine powder by the method. It is a fine powder treated to prevent scattering.

The present invention will be explained in more detail below.

The hollow plastic fine powder treated to prevent scattering in the present invention has a true specific gravity of 0.5 or less.

The fine powder used in the present invention has a light specific gravity and is fluid, making it easy to process.

The hollow plastic fine powder is usually handled in a container such as a plastic bag or a container bag.

In addition, the liquid substances used to prevent scattering of the hollow plastic fine powder include, for example, water, organic solvents, plasticizers, silicone oil, vegetable oil, silane coupling agents, polyvalent Examples include alcohol, prepolymer solutions, synthetic resin paints, etc., but are not limited to those listed here.

The liquid substance applied to the treatment of the hollow plastic fine powder is preferably selected as appropriate depending on the use of the hollow plastic fine powder.

For example, in the case of fine powder to be mixed into vinyl chloride resin, acrylic resin, etc., a plasticizer or the like is used as a liquid substance to treat the fine powder. In addition, in the case of fine powders to be mixed into polyester resins, polyurethane resins, etc., polyhydric alcohols are used as the liquid substance.

When carrying out the present invention, the liquid substance is used at a ratio of 1 to 30 parts by weight per 1 part by weight of the fine particles.

The airless spray device used in the present invention is, for example, a severe duty airless pump series manufactured by Nippon Gray Co., Ltd., and various airless spray guns are attached to this airless pump. It is desirable that one or more airless spray guns be installed in a convenient direction for the flow of fine powder.

By using this airless spray device to spray liquid substances from a soufflé gun, the liquid substances used for processing can be efficiently sent into the processing equipment without introducing air, allowing for efficient delivery in a short period of time while keeping the fine powder flowing. It has the advantage of being easily processed.

In the present invention, when processing hollow plastic fine powder, for example, a container 7 (plastic bag) containing fine powder 6 is placed in a mixing tank 1 as shown in FIG.
The plastic bag is brought into close contact with the inner wall 9 of the mixing tank by suction through the suction port 10 by the container suction holding device 4 attached to the mixing tank 1, and the stirring blade 5 and airless spray 3 are inserted into the plastic bag to stir it. However, the most suitable method is to spray a liquid substance.

[Example] Hereinafter, the present invention will be specifically explained with reference to Examples.

Example 1 As shown in FIG. 1, in a mixing tank 1 equipped with a mixer 2, an airless sprayer 3, and a container suction holding device 4, hollow plastic balloon fine powder 6 (fine powder mainly composed of crylonitrile resin) A polyethylene bag-like container 7 containing 1,000 parts by weight of polyethylene, true specific gravity 0.015 to 0.025, and particle size distribution 20 to 80 μm is placed in the bag-like container together with the bag-like container 7.
The package is opened, the stirring blade 5 of the mixer 2 and the airless sprayer 3 are inserted into the fine particles 6, the lid 8 is sealed, and the inside of the mixing tank 1 is suctioned by the container suction holding device 4 to remove the polyethylene bag from the mixing tank. It is held in close contact with the suction port 10 of the inner wall 9 of 1.

Next, the hollow plastic balloon fine powder 6 is stirred while nitrogen gas is inserted into the bag-like container 7, and a plasticizer (DOP) is added.
As a result of spraying 5,000 parts by weight with Airless Spray 3 (trade name: /Via Duty Airless Pump, manufactured by Nippon Gray Co., Ltd.), a wet hollow plastic balloon with no scattering properties was obtained in 60 seconds.

On the other hand, for comparison, the plasticizer was added and stirred using the normal addition method without using an airless sprayer.
Because the hollow plastic balloons were lightweight, they were not evenly wetted, and even after 45 minutes of stirring, the wetted balloons were not uniformly wetted, and separation occurred between the wetted balloons and the non-wetted balloons.

Comparative Example 1 A polyethylene bag-like container sealed with 1000 parts by weight of the same hollow plastic balloon fine powder as in Example 1 was placed in the mixing device shown in FIG. 5000 parts by weight of plasticizer (DOP) is directly mixed into the fine powder of the hollow plastic balloon inside, a stirring blade is inserted, the lid is sealed, and the mixing tank is suctioned to bring the polyethylene bag into close contact with the inner wall of the mixing tank. hold it.

Next, while inserting nitrogen gas into the bag-like container, the hollow plastic balloon fine powder and the plasticizer were stirred and mixed.
Even after 45 minutes had elapsed, a considerable amount of the non-wet hollow plastic balloon fine powder remained, and when the wet fine powder was taken out, this non-wet fine powder would scatter, making the work difficult.

Example 2 A hollow plastic balloon fine powder 6 (fine powder mainly composed of vinyl chloride resin and hnylidene chloride resin, true specific gravity 0.01 to 0°02, particle size distribution 20 to A polyethylene bag-like container 7 containing 1000 parts by weight of 80μ) is placed in the bag-like container, the bag-like container 7 is opened, and the stirring blade 5 of the mixer 2 and the airless spray 3 are inserted into the fine powder 6. Then, the lid 8 is sealed, and the inside of the mixing tank 1 is suctioned by the container suction holding device 4 to hold the polyethylene bag in close contact with the inner wall 9 of the suction port 10 of the mixing tank 1.

Next, the hollow plastic balloon fine powder 6 is stirred while nitrogen gas is inserted into the bag-like container 7, and 5000 parts by weight of polyester polyol is applied to it using an airless spray 3 (product name: Nijivia Duty Airless Pump Nippon Gray Co., Ltd.). As a result of injection, a moist hollow plastic balloon with no scattering properties was obtained in 60 seconds.

Comparative Example 2 A polyethylene bag-like container filled with 1000 parts by weight of the same hollow plastic balloon fine powder as in Example 2 was placed in the mixing apparatus shown in FIG. 1, the bag-like container was opened, and the contents of the container were 5000 parts by weight of polyester polyol is directly blended into the hollow plastic balloon fine powder, a stirring blade is inserted, the lid is sealed, and the mixing tank is suctioned to hold the polyethylene bag in close contact with the inner wall of the mixing tank. .

Next, as a result of stirring and mixing the hollow plastic balloon fine powder and the polyester polyol while inserting nitrogen gas into the bag-like container, a considerable amount of the hollow plastic balloon fine powder that did not get wet remained even after 45 minutes had passed.
When the wet fine powder was taken out, the non-wet fine powder scattered, making the work difficult.

[Effect of the invention] In the method of the present invention, by using a relatively simple device,
Dispersible hollow plastic fine powder in a container such as a plastic bag can be treated to be non-scattering in a very short time while remaining in the container.

In addition, the fine powder obtained by the present invention does not scatter even if it is stored in a specially sealed container, so it does not contaminate the workplace and has excellent workability, and is effective as an additive for paints, plastics, etc. .

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention. Codes in the figure are 1; mixing tank; 2; mixer; 3; airless spray; 4; container suction and holding device; 5; stirring blade; 6
: Fine powder, 7: Container, 8: Lid, 9: Inner wall, 10: Suction port. Patent applicant: Dainichiseika Kagyo Co., Ltd.

Claims (1)

[Claims] 1. A method for preventing scattering of fine powder, which comprises spraying a liquid substance onto hollow plastic fine powder in a container using an airless spray device. 2. Claim 1, wherein the liquid substance is one or more selected from water, organic solvents, plasticizers, silicone oils, mineral oils, vegetable oil silane coupling agents, polyhydric alcohols, prepolymer solutions, synthetic resin paints, etc. The described method for preventing scattering of fine powder. 3. Claim 1 or 2, wherein the true specific gravity of the fine powder is 0.5 or less.
The described method for preventing scattering of fine powder. 4. Fine powder treated to prevent scattering by the method of claims 1 to 3.