JPS59195505A - Manufacture of floating expandable sodium percarbonate - Google Patents

Abstract

PURPOSE:To manufacture floating expandable sodium percarbonate having superior solubility at low temp. by adding a specified percentage of a nonionic surfactant to powdered sodium percarbonate, mixing them, and heating the mixture at a specified temp. CONSTITUTION:To sodium percarbonate powder of >=100 mesh grain size is added 0.01-0.5wt% nonionic surfactant, they are mixed, and the mixture is heat- treated at 80-140 deg.C to obtain floating expandable sodium percarbonate. Said sodium percarbonate powder used is prepd. by continuously feeding sodium carbonate and an aqueous soln. of hydrogen peroxide to mother liquor contg. sodium carbonate, water and hydrogen peroxide or further contg. a stabilizer such as sodium chloride. Said nonionic surfactant is an adduct of >=5mol 8-22C straight or branched chain higher alcohol to ethylene oxide.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing floating foamable sodium percarbonate having excellent solubility, which dissolves while foaming near the water surface when added to water.

Traditionally, sodium percarbonate has been widely used as a clothing bleach, detergent additive, kitchen bleach, etc. Sodium percarbonate has a higher bleaching effect at low temperatures than sodium perborate. This is especially useful in Japan, where low-temperature cleaning is customary.

(When bleaching clothes using an aphrodisiac containing thorium percarbonate, it is generally preferable to completely dissolve the bleach before soaking the clothes, but in some cases it is not completely dissolved. In some cases, clothes are soaked in water.Furthermore, some people soak clothes, then sprinkle bleach directly on top of the clothes and leave it as is.Even in such cases, the dissolution rate may be affected due to the high processing temperature. Since it is quick, there is no problem as shown on the left, but if the processing temperature is low, some undissolved parts will remain for a long time, causing various problems. For example, when bleaching colored patterned clothing with stains, such undissolved parts will remain. For long-term contact with alloy metals (especially copper) dyed fabrics, there is a drawback that it causes partial decolorization and, as a result, a decrease in fiber strength.

The inventors of the present invention have conducted intensive research to solve this problem by improving the solubility of sodium percarbonate, and as a result, we have found a foaming foam with extremely excellent solubility.
The present invention was achieved by discovering a method for producing aluminum.

The floating foamable sodium percarbonate of the present invention is powdered percarbonate.
0.01 to 0.5 percent nonionic surfactant is added to W sodium, and the mixture is heated to decompose some of the percarbonate.

What is floating-L foaming percarbonate? When added to water, percarbonate dissolves while foaming immediately on the surface of the water, or sinks to the bottom and then floats to the top. It exhibits phenomena such as dissolution, and due to intense bubbling and dissolution, the liquid immediately becomes cloudy with oxygen gas bubbles. As is clear from these dissolution properties, the floating foamable sodium percarbonate of the present invention has a higher dissolution rate than conventionally known (foamed) sodium percarbonate, and can be rapidly dissolved even at low temperatures. It completely dissolves in.

In addition, the floatable and foamable sodium percarbonate of the present invention has a solubility property of floatable and foamable properties, so that alloy 1i4 dye-(
In particular, when bleaching colored and patterned clothing dyed with copper-containing direct dyes and reactive dyes, it does not cause problems such as partial decolorization or fiber strength reduction, and furthermore, it It has the advantage of promoting volatilization from the treatment bath and providing a pleasant feeling of use.

In contrast, general sodium percarbonate or conventional → [1
When the effervescent sodium percarbonate is added to water, the particles either settle and gradually dissolve at the bottom of the container, or it foams, but the degree of foaming is weak and there is almost no cloudiness. Or, even if there is some at first, it disappears quickly.

Lithium percarbonate contains thorium carbonate, water, and dihydrogen oxalate, and if necessary, stabilizers such as thorium, silicate, danesium, or phosphate are added to the BJ liquid. Obtained by continuously supplying sodium carbonate/sodium and hydrogen peroxide. Generally Na C0・
It is obtained as hydrogen peroxide added to thorium carbonate expressed as 3/2H202. - General - Commercially available products have an effective oxygen content of 12 to 14.0%. (The theory of NaCO 3/2 H21J, , 13 effect M element, 8 is 15.3%). As the powdered sodium percarbonate used in the present invention, such commercially available sodium percarbonate,
You may also use 1 liter of moisture precipitated from the IJ liquid.
Powdered sodium percarbonate, preferably lJ'11, obtained by centrifugally deoiling the FI-like sodium percarbonate slurry.
Granular thorium percarbonate can be used.

Examples of the nonionic activator used in the present invention include ethylene oxide adducts of higher alcohols having a linear or branched chain of C22 to C8 (additional mole number of 5 moles or more 1-), 'CB~C2
Ethylene oxide adducts of alkylphenols having 2 alkyl groups (number of moles added: 5 moles or more), or ether compounds of these nonionic activators and C1 to C22 linear or branched alcohols, or ethylene oxide A so-called solminic type activator consisting of a block copolymer of and propylene oxide can also be used.

In carrying out the present invention, these 111 ion activators may be added to powdered sodium percarbonate and extrusion granulated to obtain granular sodium percarbonate particles, but more preferably sodium percarbonate particles. It is best to spray it on the surface and then heat it.J The method of adding a nonionic activator is to spray it evenly using a sprayer alone, or dissolve or suspend it in water depending on the type of heart attack. May be sprayed. For image formation, when using a paste-like nonionic activator, mix thorium percarbonate and the nonionic activator in powder form or as finely granulated as possible, and preheat at about 50 to 80°C. f′i+ix
It is preferable to heat-treat the nonionic surfactant after blending it with the surface of the sodium percarbonate. In this case, the sodium percarbonate particles are preferably spherulite and have a particle size of 100 mesh (149 L) or more, rather than needle-like fine crystals.

When fine granules or needle-shaped crystals of 100 mesh or less are sprayed with a nonionic activator and heat treated, the foaming properties may be reduced by a month (if stored for a long period of time) immediately after production. is undesirable because it causes a decrease in its performance and may even disappear in some cases.

The added acid of the nonionic activator used in the present invention is 0.01 to 0.
．． 5% by weight, preferably 0.05-0.2% by weight. If the amount added is less than 0.01%, it will not exhibit sufficient foaming properties, and if it is more than 0.5%, it may reduce the stability of the system, and there is a risk of ignition or ignition during heat treatment. There are problems and I don't like it.

When heat-treating sodium percarbonate containing a small amount of J1 ion activator, add sodium percarbonate L. If τ1]'(<ii oil heating 60
~+00°C), and after pre-drying the wet sodium percarbonate, the temperature is 80-140°C, preferably 115-130°C.
Preferably, the heat treatment is performed at 0C. If the temperature is raised immediately, the degree of decomposition increases, so it is preferable to remove some moisture and then heat-treat at 100°C or higher.

The time required for heat treatment is generally 6 to 10 hours at 80°C, 10 to 80 minutes at 115°C, and 4 to 20 minutes at 140°C.
minutes, preferably 15-40 minutes at 115°C, +
It takes 10-20 minutes at 30'0. If the heat treatment is insufficient, the desired floating and foamable sodium percarbonate cannot be obtained, and if the heat treatment is excessive, the degree of decomposition of the sodium percarbonate increases. From the viewpoint of operability, yield, etc., treatment at a relatively high temperature and for a short time is preferable. The floating and foaming sodium percarbonate produced by the method of the present invention is an activator, a surfactant, a cleaning agent,
1115 ingredients such as fragrances can be added to make bleach compositions for clothing. Also, is this bleach for Sendai, bath kettle cleaning/II agent, and drainage? It can be used for various purposes such as old paper and cleaners.

The present invention will be described below with reference to Examples, but the present invention is not limited to these Examples.

Example 1 Commercially available sodium percarbonate (effective oxygen content 13.8%) was divided into particle sizes of 100 to 16 meshes (148 to 100 (l)), and polyoxyethylene (10 mol), lauryl A predetermined amount of ether was added and mixed, and the mixture was heat-treated for 20 minutes in a thermostat at 125° C., and then its dissolution rate and state of dissolution were measured and observed. The results are shown in Table 1.

Table 1: Measurement of ・°・㽇゛Φ11 Pour 20°C ion-exchange water into a beaker, add 1 g of sample to 1:1:1 on a scale), and gently add it to the water surface to form a half-moon shape. Gently rotate (30r, p, m) one IW stirring blade (length 8cm++☆, length 2cm) one by one, measure the change in electrical conductivity, and measure the change in electrical conductivity until it reaches 95% of the saturation value. The time required to reach this value was defined as the dissolution rate.

rrFnj! J! L-shaped 51'+ (7) III'?
Pour 20℃ ion-exchanged water into a 500cc beaker and add sample lgjJj to lq'':Iit
L "C1 static crab water 1fii -114,1 added,
The state of dissolution was observed. The results are displayed using the following symbols.

○: Immediately after addition, the melt angle is melted while foaming at the water surface.7. j
do.

O: After addition, foaming occurs after dropping to a position approximately 1" below the water level. △: Foaming occurs after reaching the bottom of the container. ×: The sample falls to the bottom of the container, and there is no particular foaming property. Example 2 Commercially available sodium percarbonate (13.8%)
was sieved to a particle size as shown in Table 2, sprinkled with 0.1% of nonylphenol polyoxyethylene glycol ether, shaken in a blender, and heat-treated at 120°C for 30 minutes. . Immediately after production and 40
Table 2 shows the measurement and observation results of the dissolution rate and state of dissolution after 20 days of storage at °C.

From Table 2 i'52, it can be seen that as the particle size becomes finer, the solubility naturally improves, but the storage stability deteriorates and the foamability also decreases.

Practical Example 3 +1j II thorium peroxidant (I3 effective oxygen fji
, l Q , 9%) and polyoxyethylene lauryl ether with different numbers of added moles of ethylene oxide were added at 0.1% J:11, respectively, and then treated in an electric constant temperature bath at 125°C for 20 minutes to determine the dissolution rate. was measured. The results are shown in Table 3.

It can be seen that the dissolution rate is excellent when the number of moles added in Table 3 is 5 or more.

Example 4 A nonionic activator was added and mixed in the same manner as in Example 1, except that the type of nonionic activator was changed, and heat treatment was performed. Table 4 shows the measurement results of the dissolution rate.

Table 4 Example 5 1. Using thorium acid and polyoxyethylene (9) nonylphenyl ether. %, various α heat treatments were carried out as shown in the following.

Ino Sothorium percarbonate, untreated, heat treated Sothorium percarbonate for 15 minutes at 115°C J
Sato V) Per) 0.1% non-ionic activator in sodium fatherate
During heat treatment at 115°C for 15 minutes, thorium percarbonate was added to 0.1% fl of nonionic activator in cloth, without heat treatment. 1 g of each 1% sprayed sample was added to 1 cup of tap water (20°C) and the dissolution state was observed.The results were as follows.

(b) Precipitates immediately when added to water. Posterior weakness 1. ) Foam once again.

・When added to water, a weak foaming phenomenon occurs momentarily, and the liquid becomes cloudy. It settles to the bottom and continues to foam.

When added to water, it instantly causes a strong foaming phenomenon! Ita becomes cloudy. The particles float and sink on the water surface, and some of them settle to the bottom and then float back up again. The system remains cloudy until almost all is dissolved.

When added to medium water, it immediately settles, and some of it temporarily floats on the surface, but it does not foam.

- When added to water, a slight foaming phenomenon occurs momentarily, and the liquid becomes slightly cloudy.・Some of it floats on the surface and foams, but it eventually settles. There is some particle floating → settling. The liquid is highly transparent overall.

Example 6 To sodium percarbonate (commercial product, effective oxygen content 13.9%), Softanol 80 [Nippon Shokubai Hayashi Nonionic Activator C secondary alcohol ethyl 12, 14 418 mole adduct 1 of Synoxa 1 was added to 0.3 % was added, heat treated under the conditions shown in Table 5 below, and the foaming buoyancy was observed. It can be seen from Table 5 that heat treatment at 110 to 130°C is preferable.

Table 5 The foamability is indicated by the following symbol.

×: Floating” - does not exhibit foaming properties 62 Weak floating 1-Foaming property ○: Obvious floating foaming property Applicant’s representative) (Kaoru Furutani)

Claims (1)

[Claims] 1. Add and mix 0.01 to 0.5% by weight of a nonionic surfactant to powdered sodium percarbonate, and mix this to 80 to 1% by weight.
A method for producing floating foamable sodium percarbonate δ, characterized by heat treatment at a temperature of 40°C. 2. The manufacturing method according to claim 1, wherein the particle size of the sodium percarbonate powder is larger than 100 mm. 3. The manufacturing method according to claim 1 or 2, wherein the nonionic surfactant is an ethylene oxide adduct (additional mole number of 5 or more) of a linear or branched higher alcohol having 8 to 22 carbon atoms. 4) The manufacturing method according to any one of claims 1 to 3, wherein the heat treatment temperature is 115 to 130°C. 5. The manufacturing method according to claim 1, wherein a nonionic surfactant or an aqueous solution thereof is sprayed onto powdered sodium percarbonate.