JPS61178005A - Defoaming agent - Google Patents

Abstract

PURPOSE:To obtain a defoaming agent excellent in both of defoaming effect and foaming suppressing effect, by using higher fatty acid having an oxyalkylene group and an oxyphenylethylene group. CONSTITUTION:A compound represented by formula (wherein R is a 5-21C saturated or unsaturated hydrocarbon group, AO is either one of an oxyethylene group, an oxypropylene group and an oxybutylene group, SO is a phenylethylene group, m is an integer of 0-3 and n is an integer of 1-3) is used as a defoaming agent. This compound is synthesized by using higher fatty acid as a stock material but decomposed fatty acid obtained from natural animal and vegetable oils and fats or synthetic fatty acid having a side chain is used. As the oxyalkylene group, an oxyethylene group, an oxypropylene group and an oxybutyl group are used and, as the oxyphenylethylene group, styrene oxide is used and these groups are successively added to fatty acid. This defoaming agent is used alone or in combination with the other defoaming agent. It is pref. to use this defoaming agent in concn. of 1-5,000ppm.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a novel antifoaming agent, and more specifically, to manufacturing processes and treatment processes in the chemical industry, polymer chemical industry, textile industry, wastewater treatment, etc. The purpose of the present invention is to provide an antifoaming agent that is effective in suppressing foaming or defoaming generated foam.

[Conventional technology]

Conventionally, in many industries, there have been cases in which the generation of foam has caused major problems, resulting in decreased productivity and, in some cases, difficulty in continuing production. Examples include the production of synthetic rubber latex, the production of water-based emulsion paints and adhesives, the fermentation industry, the production of phosphoric acid, the pulp production and papermaking process in the paper industry, the scouring and dyeing processes in the textile industry, the treatment of industrial wastewater, and the treatment of domestic wastewater. Examples include processing. Conventionally, in order to suppress the generation of bubbles in these industries, mineral oils such as spindle oil and machine oil, higher alcohols, fatty acids, fatty acid amides, metal soaps, or silicone compounds have been used individually or in combination of two or more. It is used in combination as an antifoaming agent.

Also, as an antifoam composition containing a synthesized surfactant (
b) Antifoaming agent for paper making made by adding propylene oxide and ethylene oxide to higher alcohol (Japanese Patent Publication No. 49-38
923), T-port) Antifoaming agent as emulsion of higher alcohol ester of ethylene oxide adduct of higher fatty acid or alkyl polysiloxane or silica of propylene oxide adduct of higher fatty acid (JP-A No. 5
0-22788, Special Publication No. 50-1475), etc. are known.

[Problem that the invention seeks to solve]

However, in recent years, various industries have frequently increased the stirring speed when mixing liquids or increased the flow rate during pipe transportation in order to improve productivity and rationalize, creating a situation where bubbles are more likely to occur. It has become. For this reason, the antifoaming agents that have been used so far do not have sufficient antifoaming effects.
It is necessary to use a large amount of antifoaming agent, and the antifoaming effect, i.e., immediate effect and sustainability, is significantly improved, and it is inexpensive and does not have any negative effects other than antifoaming when used in various fields. It is becoming more and more required.

For example, in defoaming during wastewater treatment, there are a wide variety of foaming components, and a single defoaming agent will not be effective in most cases, requiring the combination of many components, which reduces the amount of defoaming agent used. This becomes unnecessary and also causes other troubles in the wastewater treatment process.

In addition, the antifoaming agents (a) to (c) cited above all consist of an ethoxy group to which ethylene oxide is added, or a propoxy group to which an ethoxy group and propylene oxide are added, and have foam-breaking and foam-inhibiting effects. Both are not enough.

Further, it is known that a propylene oxide adduct alone has an antifoaming effect, but although it has an antifoaming effect, it has the drawback of having a low antifoaming effect.

As a result of studies to solve the above-mentioned problems, the present inventors discovered a novel antifoaming agent with excellent antifoaming and antifoaming effects, and arrived at the present invention.

[Means for solving problems]

That is, the general formula RCOO(AO)ffl (So)n
H (wherein R is a saturated or unsaturated hydrocarbon group having 5 to 21 carbon atoms, AO is any of oxyethylene group, oxypropylene group, or oxybutylene group, SO is phenylethylene group, m is O- By using a compound represented by an integer of 3, n is an integer of 1 to 3, antifoaming properties,
It has been found that an excellent antifoaming agent or antifoaming agent composition with high antifoaming properties can be obtained.

The compound represented by the general formula used here is synthesized using higher fatty acids as raw materials. It is a fatty acid having a saturated or unsaturated hydrocarbon group having 5 to 21 carbon atoms, and may be a decomposed fatty acid obtained from natural animal or vegetable oils or a synthetic fatty acid having a side chain.

The oxyalkylene group represented by rAOJ includes oxyethylene, oxypropylene, and oxybutylene, and the oxyphenylethylene group represented by rsOJ includes styrene oxide. The compound of the above general formula can be obtained by adding oxyalkylene to a fatty acid and then adding oxyphenylethylene thereto, but it may be obtained by adding oxyphenylethylene without adding oxyalkylene. When adding oxyalkylene, the number of moles added is preferably 1 to 3; if 3 moles or more is added, the hydrophilicity increases and the antifoaming effect decreases. Further, the suitable number of moles of oxyphenylethylene to be added is 1 to 3 moles; if it exceeds 3 moles, the antifoaming effect decreases and the cost increases, which is economically disadvantageous.

To use the compound of the above general formula as an antifoaming agent, it can be used as is, but other antifoaming agents, emulsifiers, waxes, fatty acid amides, organosiloxanes,
It can be used in combination with silica-based compounds, etc. Furthermore, it can be used even when dissolved in paraffinic or naphthenic hydrocarbons, mineral oils such as spindle oil, machine oil, turbine oil, etc.

It can also be used as an antifoaming agent in the form of an emulsion in water together with the above components. The effect when the compound represented by the general formula Q) of the present invention is used as an antifoaming agent depends on the purpose for which antifoaming or antifoaming effects are sought, the substance involved in the foaming and its amount, etc. latex, synthetic resin emulsion, paint, adhesive, fiber, paper, pulp,
When used in the manufacturing process of phosphoric acid, etc., the treatment process of domestic wastewater, industrial wastewater, etc., the compound of general formula (I) is 1 to 50
By adding 00 ppm, the desired defoaming,
A foam suppressing effect can be obtained.

〔Example〕

The present invention will be explained below with reference to Examples.

1) Coconut oil fatty acid, oleic acid, and beef fatty acid are used as synthetic fatty acids for the compound of general formula fIl, and ethylene oxide (EO) or propylene oxide (PO) is added to the fatty acid, and 2% by weight of caustic potassium is present in the fatty acid. The mixture is reacted at 140 to 170° C., and after completion of the addition reaction in an amount corresponding to a specified number of moles, the reaction is continued with a specified number of moles of styrene oxide (So) under the above conditions.

Even when only styrene oxide is subjected to an addition reaction, the fatty acid has a concentration of 140 to 180% by weight in the presence of 2% by weight of caustic potassium.
React at ℃ to add a specified number of moles.

After the addition reaction is completed, acetic acid, phosphoric acid, etc. are added as necessary to neutralize the alkali caused by caustic potash, and the mixture is used at a pH of 5 to 7.

Table 1 shows EO, P using coconut oil fatty acids and oleic acid.
The addition reaction products (Nα1 to 20) obtained by reacting with different numbers of added moles of O and So are shown.

Table 1 Note) EO: ethylene oxide, PO: propylene oxide, SO: styrene oxide.

2) Measurement Example Compounds Nα1 to Nα20 in Table 1 were used to compare the antifoaming effects in producing phosphoric acid from phosphate ore using the following method.

Test method: 11! Put 100 Da of phosphate rock (Florida 72) and 154 F of water into a graduated cylinder and heat to 90-95℃.
Stir at 30 rpm for 2 minutes. To this, previously prepared decomposed acid 246II [:phosphoric acid (8596 concentration) 14
Mixture of 4F and sulfuric acid (95% concentration) 1029]
is dropped through a dropping funnel to decompose the phosphate rock and cause foaming. Two minutes after the completion of the dropwise addition, 50% of each of the compounds in Table 1 was added.
mg was added, and the foam height (cm) was measured immediately after the addition and 1,2,3,4.5 minutes later. The results are shown in Table-2.

Table 2 3) Measurement results 1) Compounds Nα1 to 20 were all effective against the blank test.
-P○ adduct (Nα17.18) has a high reputation and has extremely poor defoaming effect.

1i) Among the So adducts (Nα5.6.7), the 4-mole adduct has a slightly lower effect, and the 1,3-mole adduct has a higher antifoaming effect.

iii) Po 11So adduct (Nα2.3.4.
8.9.10), So.4 mole adduct (Nα4.
10) is highly famous and has a low antifoaming effect, but among the 1 mol and 3 mol adducts of SO, both (Nα 2.3) have a high antifoaming effect, but Nα 8.9 has a slightly more antifoaming effect. Less effective.

iv) From the above results, it is clear that the adduct to which SO is added has a superior defoaming effect to the adduct to which SO is not added. The effect is high when the number of moles of SO added is up to 3 moles, but
When it becomes 4 mol, the effect decreases, and 3 mol or less is excellent.

V) If PO or EO is added to So, PO or E
The number of moles of O added is preferably in the low range of 1 to 3 moles.

Example 1 Using beef fat fatty acid, an adduct was synthesized as shown in Table 3 by the synthesis method described in 1) above.

Table 3 Compounds Nα21 to Nα24 in Table 3 were each dissolved in 50% by weight in No. 2 spindle oil to prepare an antifoaming agent.

60 mg of antifoaming agent prepared by decomposing and foaming phosphate rock (Morocco) in the same manner as described in the measurement example.
was added and Meiko was measured at the same time. The results are shown in Table 4.

Table 4 Example 2 From the compounds in Tables 1 and 3, Nα2.3.5.6.11.1
Using 2.18.19.21.23, an emulsion type antifoaming agent having the following composition was prepared.

Compounds in Tables 1 and 3 42 parts Spindle oil 30 Stearyl ethylene bisamide 2 Hydrophobic silica (Aerosil R-9
72) 2 nonyl phenol EO 9 mole adduct 2 Water 2
Second, 100 m of 10% polyvinyl acetate emulsion was put into a measuring cylinder No. 11, and 0.2 m of the above antifoaming agent was added to it.
9 and add 200 ml of N2 gas from the bottom of the graduated cylinder through a ball filter! Immediately after blowing at a speed of /min, the height (mm) at the elapsed time of 10, 20, 30, 40, and 50 minutes was measured. The results are shown in Table-5.

Incidentally, Nα18.19 was included for comparison.

Table-5

Claims (1)

[Claims] 1. General formula RCOO(AO)m(SO)nH...
・・・・・・・・・・・・(I) (However, in the formula, R is a saturated or unsaturated hydrocarbon group having 5 to 21 carbon atoms, and AO is an oxyethylene group, an oxypropylene group, or an oxybutylene group. , SO is a phenylethylene group, m is an integer of 0 to 3, and n is an integer of 1 to 3).