JPS6035029A - Perfume-containing granular master batch and its production - Google Patents

Abstract

PURPOSE:To obtain an inexpensive master batch having a high perfume content and low evaporation loss of perfume during molding, by adding the perfume and a polyolefin in turn to an ethylene/vinyl acetate copolymer powder with high speed agitation and kneading the mixture. CONSTITUTION:50pts.wt. or above perfume is added to 100pts.wt. ethylene/vinyl acetate copolymer (EVA), and the mixture is kneaded at a high speed. Polyolefin powder is added thereto and agitated at a high speed to obtain a granular master batch. The EVA powder used is usually one containing 5-45wt% vinyl acetate and includes also its modified resin. Examples of the perfumes used include lemon oil, lavender oil, alpha-pinene and camphene and compounded perfumes thereof. When the amount of the perfume used is below 50pts.wt., the mixture does not form a gel and even when the polyolefin powder is added afterwards, formation of granules is difficult.

Description

[Detailed description of the invention] This invention relates to a granular masterbatch and its manufacturing method.

Conventionally, colored master bunches of polyolefin containing a high concentration of inorganic pigments have been produced using extruders, etc. because the inorganic pigments are powders, so they can be easily dispersed into polyolefin powders, and they do not decompose or dissipate due to heat. could be pelletized relatively easily.

However, when producing a liquid composition, for example, a pellet-like masterbatch containing a perfume in polyolefin powder at a high concentration, the perfume is difficult to disperse into the polyolefin powder because it is liquid, and furthermore, when pelletizing with an extruder etc. However, this method could not be adopted because the boiling point of the fragrance was lower than the softening temperature of the polyolefin, and therefore the heat dissipation rate was high.

As a method for solving the above problem, a method is known in which a fragrance is adsorbed onto an inorganic filler such as fine silica powder, and then blended with polyolefin powder and pelletized using an extruder or the like to obtain the target substance. However, when inorganic fillers such as silica are added to polyolefins, they generally reduce the transparency, gloss, etc. of the resulting molded products, and since inorganic fillers themselves contain a large amount of water, they cannot be used in extrusion or injection molding. The reality is that foaming sometimes occurs, making it impossible to obtain a satisfactory molded product.

On the other hand, there is a method in which a large amount of fragrance is contained in porous polyolefin pellets having a high porosity.

The masterbatch obtained by this method can be blended with a polyolefin impeller and then extruded or injection molded, and it is possible to obtain an aromatic plastic molded article with less fragrance loss.

However, the production process of the porous polyolefin and the process of incorporating fragrance require special technology, which inevitably leads to high costs.

In view of the above-mentioned circumstances, the inventors of the present invention have deeply studied the production of an inexpensive granular masterbatch that has a high fragrance content and less fragrance loss during molding, and as a result, used a specific ethylene copolymer powder. The inventors have discovered that this object can be achieved by the following methods, and have arrived at the present invention.

That is, the present invention provides ethylene-vinyl acetate copolymer powder 1
A granular fragrance-containing masterbatch obtained by adding 50 parts by weight or more of a fragrance to 00 Ichikawabe, stirring and kneading at high speed, and then adding a polyolefin powder and stirring at high speed, and a method for producing the same.

According to the present invention, it is possible to provide a granular masterbatch containing a fragrance at a high concentration at a low cost, and since this masterbatch has a granular shape, it can be easily blended with general polyolefin pellets. Can be done.

Further, the fragrance is less likely to escape during thermoforming such as extrusion or injection molding, and it is possible to easily provide fragrant plastic products without deterioration of appearance and physical properties.

The ethylene-vinyl acetate copolymer powder (hereinafter abbreviated as EVA powder) used in the present invention usually contains 5 to 45 vinyl acetate layers, and also includes modified resins of shredded mushrooms.

Examples of polyolefin powder include polypropylene, polypropylene-ethylene copolymer, low density polyethylene, medium density polyethylene, high density polyethylene, etc., as well as porous powders of the above polyolefins. Materials other than ffi polyolefin powder can also be used. Further, as for fragrances, commonly available ones can be used, and there are no particular limitations on the fragrances. For example, natural fragrances such as lemon oil, lavender oil, and menthol, synthetic fragrances such as α-pinene, camphene, limonene, and methyl salicylate, and blended fragrances of these fragrances can be used.

Conditions for producing a good granular masterbatch include E
VA/: Depends on the blending ratio of powder and fragrance and the amount of polyolefin powder added. That is, it is important to impregnate 100 parts by weight of EVA powder with at least 50 parts by weight, preferably at least 100 parts by weight, of fragrance to form a gel. If it is less than 50 parts by weight, it will not become gel-like, and even if polyolefin powder is added later, it will be difficult to form granules.

The amount of polyolefin powder to be added is preferably as small as possible so that the masterbatch has a high concentration of fragrance content under granular conditions. That is, usually 10 parts by weight of a gel composition consisting of EVA powder and fragrance.
It is preferable to add 0 parts by weight or more. If the amount of polyolefin powder added is less than 100 parts by weight, a sticky granular masterbatch will be produced, which is not preferable. At this time, this tendency can be slightly improved by adding a small amount of lubricant such as stearic acid or calcium stearate, but
It is preferable to add at least 100 parts by weight or more, preferably 150 parts by weight or more. However, when porous polyolefin powder is used, the bulk specific gravity is smaller than that of general polyolefin powder, so a granular masterbatch without stickiness can be obtained even with less than 100 parts by weight. In this case, the porous polyolefin powder is manufactured by Armak Co., Ltd. under the trade name Accurel.
Examples include powder. The fragrance content of the granular master hatch obtained by the above method is usually in the range of 5 to 60% when a general polyolefin powder is added and a porous polyolefin powder with a weight coefficient of 5 to 60% is added.

The fragrance content defined here is the weight of the fragrance divided by the degenerate sum of the fragrance, polyolefin powder, and EvA powder, and the value is multiplied by ioo. In addition, masterbatches usually consist mainly of granules with a diameter of 1 to 5 mm.
It is easy to blend because it is about the same size as general resin pellets.

As the conditions for high-speed stirring used in the present invention, a high-speed stirring ability that can be easily obtained by using a commonly used Henschel mixer is sufficient, and no special conditions are required, so there is no need to Nor is it limited to the use of a Henschel mixer.

The granular fragrance-containing masterbatch obtained by the present invention is useful when a fragrance is contained in a polyolefin molded article formed by extrusion molding, injection molding, or the like to obtain a molded article having an aroma.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 101 Hensiel (Mitsubishi Electric Super Line E)
VA powder (manufactured by Tokyo Ink Co., Ltd., product name: Thermotac 8)
050C! ) and added 90 f/ of fragrance (manufactured by Haseyo Fragrance Co., Ltd., trade name: Mis-1335) through the opening at the top of Henschel while stirring at low speed, at a rate of 1/min.
The mixture was stirred at 000 rpm for 30 seconds to obtain a gel-like composition. Furthermore, polypropylene powder (manufactured by Mitsui Toatsu Chemical Co., Ltd.)
25OS' was added and stirred at 1,000 revolutions per minute for 60 seconds to obtain a granular masterbatch. The masterbatch with a fragrance content of 22% was mixed with a propylene-ethylene copolymer (manufactured by Mitsui Toatsu Chemical Co., Ltd., trade name: Mitsui Noblen MJ).
S-G) 100 parts by weight was blended with 6 parts by weight and an extruder was used to produce a 05 thick sheet.

A sheet with a lasting aroma was obtained. There was no foaming, the appearance of the sheet was good, and there was no deterioration in transparency, physical properties, etc.

Example 2 In Example 1, instead of polypropylene powder, A
Porous powder manufactured by RR113 (product name ACCu-r)
el, porosity 80%) 30F is added and fragrance content is 50%.
A granular master bunch of was obtained. The above masterbatch was added to polypropylene (manufactured by Mitsui Toatsu Chemical Co., Ltd., Mitsui Noblen J).
2 parts by weight were blended into 100 parts by weight of H-G) and molded into a pen plate using an injection molding machine.

This molded product maintained its aromatic properties to the extent that almost no change was observed even after 6 months.

Example 3 EVA (manufactured by Tokyo Ink Co., Ltd., trade name Thermotac D219) 601i', fragrance (
Perfume 5T-613) 9
Stearic acid 201, stearic acid 201,
Polypropylene powder (manufactured by Mitsui Toatsu Chemical Co., Ltd.) 1507
was added to obtain a masterbatch with a fragrance content of 28%.

Add the above masterbatch to 100 parts by weight of polypropylene (manufactured by Mitsui Toatsu Chemical Co., Ltd., Mitsui Noblen FL-100).
Two parts of heavy M were blended to produce an inkjet film with a thickness of 60 μm. The film had aromatic properties and had a good appearance.

Comparative Example 1 In Example 1, fragrance 90f was added to polypropylene powder 609 without using EVA powder, but a gel-like composition was not obtained but a suspension, and even when polypropylene powder was further added, it did not become granular. .

Comparative Example 2 In Example 1, EVA powder 6o7, fragrance 901,
Although 250 f of polypropylene powder was added at once and stirred at 1,000 revolutions per minute, the mixture did not become granular and a powdery masterbatch was obtained.

patent applicant Mitsui Toatsu Chemical Co., Ltd. 0

Claims (1)

[Claims] A granular fragrance-containing masterbatch obtained by kneading, then adding polyolefin powder and stirring at high speed. (2) Ethylene-vinyl acetate copolymer powder 100
A method for producing a granular masterbatch, which comprises adding 50 parts by weight or more of a fragrance to parts by weight, stirring and kneading at high speed, and then adding polyolefin powder and stirring at high speed.