JPH0686363B2 - Ignition composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The composition of the present invention is particularly useful as an igniter for a slow-burning combustible substance such as incense sticks and mosquito coil sticks that need to be burned for a long time. is there.

<Problems to be Solved by Conventional Techniques and Inventions> Conventional ignition agents include natural resins, synthetic resins, charcoal, wood dust, paper,
Combustion accelerators such as sulfur, perchlorates, nitrates, dichromates, and permanganates are added to such combustion agents, and these compositions take (1) hours. It is difficult to ignite a slow-burning combustible material that is difficult to ignite because it needs to be burned with a conventional igniter because the burning time is short. Also, in order to facilitate ignition with conventional ignition agents, a large amount of ignition agents is required,
As a result, a large amount of smoke and flames are generated when the ignition agent burns.

(2) Combustion accelerators used for conventional ignition agents such as nitric acid smoke and perchlorate are highly hygroscopic, and charcoal, paper, wood powder, etc., which are combustion agents, are also hygroscopic, so they are highly humid. If stored for a long time in this state, the ignition performance will deteriorate significantly.

The inventors of the present invention described the above (1), which is regarded as a drawback of the conventional ignition agent.
As a result of intensive research aimed at solving the problems of (2) and (2), the present invention was achieved.

<Means for Solving the Problem> The present invention uses nitrocellulose as a main combustion agent,
This is a composition prepared by adding a specific amount of a metal compound having an average particle size of 20 microns or less, a plasticizer and / or a nitrocellulose compatible resin. Nitrocellulose is well known as a highly flammable flammable substance, and has potential as an igniting agent. However, since nitrocellulose alone has a very high burning rate, it lacks smoothness in igniting slow-burning materials such as mosquito coil.
Since it lacks stability, it cannot be used as an ignition agent. Here, stability refers to the property that nitrocellulose does not spontaneously ignite due to external physical stimuli such as impact and heating.

The present inventors have utilized the property of nitrocellulose, which is a fast-burning property, and as a result of promoting the development of an ignition agent, the particle diameter is 20 millimicrons or less, preferably 10 microns or less, relative to 100 parts by weight of nitrocellulose. Iron ferrocyanide, iron oxide, lead oxide, lead chromate, lead sulfate, chromium oxide, nickel carbonate, zinc oxide, barium sulfate, manganese dioxide, etc. 15 to 500 parts by weight, preferably 20 to 450 parts by weight It is selected from castor oil, dibutyl phthalate, polyester, epoxidized soybean oil, acetyltributyl citrate, tricresyl phosphate, dioctyl adipate, dioctyl sebacate, sulfamide, etc.
8 to 100 parts by weight, preferably 10 to 9 parts by weight of a plasticizer for nitrocellulose, or a mixture of two or more kinds thereof.
Nitrocellulose compatibility selected from 0 parts by weight and / or ethylene-vinyl acetate copolymer, polyamide resin, acrylic resin, rosin, rosin glycerin ester, hydrogenated rosin ester, ketone resin, terpene resin, alkyd resin, petroleum resin, etc. 8 to 100 parts by weight, preferably 10 parts by weight, of a resin alone or a mixture of two or more kinds.
It was found that the composition was stable and useful as an ignition agent by adding from 90 parts by weight to 90 parts by weight.

The powdery metal compound has a property of being red-heated or self-combusted by the burning of nitrocellulose to leave a residue, and in this case, the remaining residue of the residue strongly controls the performance of the ignition agent of the present invention.

The required afterburning time depends on the shape and degree of flammability of the ignited object, the amount of the igniting agent attached to the ignitable object, etc., but if the afterburning time is at least zero, the function as an igniting agent will be lost. Be seen.

The remaining time of the composition is influenced by the burning time and burning rate of nitrocellulose, the kind of the compound, the degree of dispersion in the nitrocellulose medium (particle size in the composition), and the composition of the composition. It

In particular, the particle size is one of the important controlling factors, and if the average particle size exceeds 20 microns, the red heat degree and self-combustibility of the compound due to the combustion of nitrocellulose are significantly impaired, and the aftertaste time becomes almost zero. Not preferable.

The plasticizer or resin not only contributes to the stability, water resistance, adhesion, and processability of the composition of the present invention, but also an important component that affects the burning time and burning rate of the composition. Is. Therefore, the addition amount of these must be strictly regulated as described above. That is, when the amount of the plasticizer and / or the resin is 8 parts by weight or less based on 100 parts by weight of nitrocellulose, not only the stability of the composition decreases but also the burning rate is high, and
If it exceeds 100 parts by weight, the flammability of the composition is significantly impaired and the intended function of the ignition agent is lost.

In order to more effectively develop the composition of the present invention as an igniting agent, it is necessary to mix nitrocellulose, a powdered metal compound with a plasticizer and / or a nitrocellulose compatible resin in accordance with the above-defined formulation. .

One of the methods is the following method.

That is, a solvent that dissolves both nitrocellulose and the plasticizer and / or the nitrocellulose-compatible resin or a mixture of the solvents that dissolves each of them as the main component is added in an amount of 10 parts by weight to 100 parts by weight of the mixture of the materials. Add 300 parts by weight and knead thoroughly in a kneader while heating from 40 ° C to 60 ° C to obtain a composition consisting of nitrocellulose, powdered metal compound, plasticizer and / or nitrocellulose compatible resin. To be Further, if necessary, the dispersibility of the metal compound can be increased by kneading the kneaded composition using a disperser such as a two-roll mill or a three-roll mill.

As described above, the nitrocellulose, the powdered metal compound, the plasticizer and / or the nitrocellulose phase-shifting resin are essential components of the ignition agent of the present invention, but in addition to this, the range that does not impair the performance of the ignition agent. And, for example, the composition 100
Powdery inorganic substances such as diatomaceous earth, clay, talc, titanium oxide, calcium carbonate, carbon black, iron powder, copper powder, and aluminum powder within a range not exceeding 80 parts by weight with respect to parts by weight,
If necessary, the metal powder may be added for the purpose of, for example, improving the production and processing of the composition, coloring, improving economic efficiency, and controlling combustion.

<Effects of the Invention> The composition of the present invention thus obtained has the following features.

(1) Ignition performance can be changed by changing the composition. That is, it is possible to design and select the igniting agent according to the shape of the ignited object or the property of the ignited object such as the degree of flammability.

(2) Since the composition can be easily dissolved in a specific organic solvent to form a coating solution, it can be applied according to the shape of the object to be ignited.

(3) Since nitrocellulose is used as a combustion agent, it is easy to ignite even in a strong wind, low temperature and high humidity environment.

(4) Since the metal compound as the ignition source is dispersed in the nitrocellulose, the plasticizer and / or the resin, no spark-like scattering occurs during combustion. In addition, the composition does not desorb or collapse from the object to be ignited during combustion.

(5) Since it has the property of leaving burns, it is possible to ignite a slow-burning combustible material with a small amount of ignition agent.

<Example> Hereinafter, the effectiveness of the present invention will be described with reference to Examples and Comparative Examples.

Example-1 30% isopropanol wet nitrocellulose H1 / 2 (manufactured by Taihei Chemical Co., Ltd.) 429 g (dry nitrocellulose 300)
Gram), 180 g of iron ferrocyanide with an average particle size of 0.07 micron, 120 g of dibutyl phthalate, ethyl acetate
60 g of methanol, 60 g of methanol, and 30 g of toluene are put into a kneading machine all at once, and the jacket temperature of the kneading machine is mixed for 60 minutes while keeping the temperature of the kneading machine at 45 ° C ± 5 ° C by the above heating,
Do the kneaded meat. Next, this kneaded mass was transferred to a two-roll mill (rotation ratio 1: 1.1, 6 inch diameter) and kneaded for 12 minutes to obtain a sheet-shaped composition. The sheet-like composition thus obtained was sufficiently dried to remove the solvent, 0.5 g was weighed, placed in a magnetic dish and burned in a dark room to measure the afterburning time after the flame was extinguished. To do. This test was repeated 10 times and the average value was calculated to be 34 seconds.

Further, 50 g of ethyl acetate was added to 30 g of the composition and dissolved by stirring, and then about 2 mm of the tip of an incense stick (manufactured by Nippon Kodo, daily incense) was applied by dipping on the coating liquid. Then, put this in a dryer kept at 60 ° C ± 2 ° C and dry it, then put it in an environment of temperature 22 ± 2 ° C and relative temperature 83 ± 3%.
After being left for 24 hours, an ignition test was performed immediately.

This operation was performed on 50 incense sticks and the variation in ignition was observed. The results are shown in Table 1.

Example-2 30% isopropanol wet nitrocellulose H1 / 2 (manufactured by Taihei Chemical Co., Ltd.) 429 g (dry nitrocellulose 300)
Gram equivalent), 300 grams of lead chromate with an average particle size of 1.5 microns, iron ferrocyanide with an average particle size of 0.07 microns 85.8
Grain average particle size of lead sulfate 42.9 grams of 1.5 microns, acetyl citrate tributyl 129 grams, ethyl acetate 80 grams, methanol 40 grams, toluene 40 grams into a kneader all at once, as described in Example-1 below. A sheet-shaped composition was obtained through the steps. The remaining soaking time and the ignition performance test of the composition thus obtained were conducted in the same manner as described in Example-1. The composition had an afterburning time of 44 seconds.
The results of the ignition performance test are shown in Table-1.

Example-3 30% isopropanol wet nitrocellulose H1 / 2 (manufactured by Taihei Chemical Co., Ltd.) 429 g (dry nitrocellulose 300)
Equivalent to gram), 240 grams of chromium oxide having an average particle size of 0.8 microns, 60 grams of thermoplastic polyurethane resin TS-45 (manufactured by Dainippon Ink and Chemicals, Inc.), 60 grams of ethyl acetate, 60 grams of toluene, 30 grams of methyl ethyl ketone. The mixture was placed in a washer all at once and the sheet-shaped composition was obtained through the steps described in Example-1 below. The remaining soaking time and the ignition performance test of the composition thus obtained were conducted in the same manner as described in Example-1. The composition had an afterburning time of 37 seconds. The results of the ignition performance test are shown in Table-1.

Comparative Example 20 grams of polyvinyl alcohol, 40 grams of sodium nitrite, 40 grams of potassium dichromate, and 30 grams of charcoal powder were added to 700 grams of water and mixed with stirring for about 3 hours. Then, a part of the sample was taken to remove water, 0.5 g of the composition in a dry state was taken, and the residual smoldering time was measured by the method described in Example-1, and it was 5 seconds. Also, the composition 30
To 50 g of water, 50 g of water was added and dissolved by stirring, and an ignition performance test of the composition was conducted by the same method as described in Example-1. The results are shown in Table-1.

As is clear from Table 1 showing the results of the above examples, the ignition rate of the composition according to the present invention is 96 to 100%, which demonstrates the effectiveness of the present invention.

Claims (4)

[Claims] 1. Nitrocellulose 100 parts by weight, average particle size 20
Ignition composition comprising 15 to 500 parts by weight of a submicron metal compound, 8 to 100 parts by weight of a plasticizer and / or a nitrocellulose compatible resin. 2. The metal compound is a compound containing iron, copper, lead, chromium, nickel, zinc, barium, manganese, and these metal compounds are used alone or in a mixture of two or more kinds. The composition for ignition described in 1). 3. A nitrocellulose compatible resin is an ethylene-vinyl acetate copolymer, a polyamide resin, an acrylic resin, an aliphatic hydrocarbon resin, an alicyclic hydrocarbon resin, a rosin and its derivative resin, a ketone resin, Alkyd resin, sucrose ester, polyurethane resin,
The ignition composition according to claim 1, wherein these resins are used alone or in a mixture of two or more kinds. 4. The plasticizer comprises: Castor oil, phthalate ester-based, polyester-based, epoxy-based, citric acid ester-based, phosphoric acid ester-based, adipic acid ester-based, sebacic acid ester-based sulfamide-based plasticizers. These plasticizers may be used alone or in combination of two or more. The composition for ignition as set forth in claim (1), which is used as a mixture.