JPS61138529A - Production of emulsified solution for sizing - Google Patents

Abstract

PURPOSE:To produce efficiently an emulsified soln. for sizing excellent in sizing performance in the less energy by feeding a mixed soln. stream consisting essentially of a sizing agent and an emulsifying agent into a water current so that a turbulent flow is formed. CONSTITUTION:A mixed soln. stream 4 flowing repletely through the inside of a circular pipe 2 which has an inner diameter of about 0.1-0.6 times preferably about 0.2-0.5 times of an inner diameter of a circular pipe 1 is supplied into a water current 3 flowing repletely through the inside of the circular pipe 1 to the same direction as the water current direction from the nearly central position of cross-section of the water current 3 in about 0.1-0.8 times velocity of water current and thereby the required turbulent flow is formed in a joint point of both the water current 3 and the mixed soln. stream 4 or in a downstream thereof. When the turbulent flow is formed by joining the water current 3 and the mixed soln. stream 4 like this method, an emulsified soln. for sizing which consists of an emulsion dispersed with the particles of sizing agent having 1-3mu particle size in water.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a sizing emulsion, and more particularly to a method for efficiently producing a sizing emulsion with a good sizing effect through simple operations while saving energy.

A commonly used paper manufacturing method is to mix a sizing agent, an emulsifier, and an emulsifying aid if necessary with water, stir thoroughly, and mix the resulting sizing emulsion with other ingredients into a pulp suspension. It consists of the following steps: paper making, dehydration, and drying.

In such paper manufacturing methods, the emulsion for sizing is usually produced by adding water to a sizing agent, emulsifier, etc. and stirring at high speed.

However, this stirring requires a large amount of energy,
Moreover, the sizing effect of paper produced using the obtained sizing emulsion was not necessarily good.

The inventors of the present invention have conducted extensive research in order to solve these problems and develop an efficient method for producing a size emulsion with excellent size effects while saving energy. As a result, it was found that the objective could be achieved by forming a water stream and a mixed liquid stream of a sizing agent and an emulsifier, and supplying this mixed liquid stream so that a turbulent flow was formed in the water stream. The present invention was completed based on this knowledge.

That is, in producing a size emulsion containing a sizing agent, an emulsifier, and water as main components, the present invention provides a mixed liquid flow containing a sizing agent and an emulsifier as main components in a water stream so that a turbulent flow is formed. The present invention provides a method for producing an emulsion for size, which is characterized by:

In the method of the present invention, the mixed liquid stream is formed mainly of a sizing agent and an emulsifier, but the sizing agent used here is not particularly limited (various sizing agents conventionally used are suitable). For example, alkenyl succinic anhydride, alkyl succinic anhydride.

Examples include substituted cyclic dicarboxylic acid anhydrides such as aralkyl succinic acid and aralkenyl succinic acid. More specifically, octyl succinic anhydride.

Dodecyl succinic anhydride, hexadecyl succinic anhydride, octadecyl succinic anhydride, ■-propyl-2-tridecenyl succinic anhydride, ■-ethyl-2-tetradecenyl succinic anhydride, ■-methyl-2-pentadecenyl succinic anhydride, 1-ethyl-2 - hexadecenyl succinic anhydride,
■-Hexy-2-tetradecenyl succinic anhydride, polypropylenyl succinic anhydride, polyisobutynyl succinic anhydride, polybutynyl succinic anhydride, styryl succinic anhydride, octyl glutamic anhydride, dodecyl glutamic anhydride, hexadecyl glutamic anhydride.

Octadecyl glutamic anhydride, 1-propyl-2-tridecenyl glutamic anhydride, l-ethyl-2-hexadecenyl glutamic anhydride M, 1-hexyl-2-tetradecenyl glutamic anhydride.

Examples include polypropylenyl glutamic anhydride, polyisobutynyl glutamic anhydride, polybutynyl glutamic anhydride, styryl glutamic anhydride, and mixtures thereof.

Various emulsifiers can be used, such as anionic emulsifiers, cationic emulsifiers, and nonionic emulsifiers. Specifically, examples of anionic emulsifiers include alkaline earth metal salts of alkylbenzenesulfonates, such as calcium dodecylbenzenesulfonate and sodium undecylbenzenesulfonate; alkaline earth metal salts of α-olefinsulfonates, such as alkaline earth metal salts of α-olefinsulfonates, such as Usually 8 to 20 α-olefin sulfonic acid calcium or sodium salts; sulfosuccinate alkaline earth metal salts, such as 2-ethylhexyl sulfosuccinate calcium salt, dicyclohexyl sulfosuccinate calcium salt, etc.; Alkyl) naphthalene sulfonates and formalin condensates of (alkyl) naphthalene sulfonates, such as diisopropylnaphthalene sulfonate calcium salt; alkanesulfonates, such as tetradecyl sulfonate calcium salt; alkaline earth fatty acid amidosulfonates Metal salts: Alkyl sulfate ester alkaline earth metal salts, such as decyl alcohol sulfate calcium salt, lauryl alcohol sulfate calcium salt, oxo alcohol sulfate magnesium salt, etc.: Polyoxyalkylene alkyl sulfate ester alkaline earth metal salt, such as decyl alcohol E O(
1) Calcium sulfate ester salt (EO indicates ethylene oxide, the number in parentheses indicates the number of moles. The same will be expressed hereinafter.), lauryl alcohol E O (41 sulfate ester calcium salt, cetyl alcohol E O (81 sulfuric acid) Ester calcium salts; polyoxyalkylene alkylaryl ether sulfate ester alkaline earth metal salts, such as nonylphenol E OT21 sulfate ester calcium salt; sulfate esters of higher fatty acid esters; alkaline earth metals, such as coconut oil fatty acid monoglyceride sulfate calcium ester; Salts, etc. Examples of cationic emulsifiers include tetraalkylammonium halides,
Examples include lauryltrimethylammonium chloride, stearyltrimethylammonium chloride, and distearyldimethylammonium chloride.

Examples of nonionic emulsifiers include polyoxyalkylene alkylaryl ethers, such as nonilph enol EO(8), octylphenol EOaΦ, dodecylphenol EOQ..., nonylphenol EOαω; polyoxyalkylene styrenated aryl ethers, such as styrene (2 ) converted phenol POQOI (PO
indicates propylene oxide.

The same information will be displayed below. ) , E O(25) P
0(31, styrene (2) phenol E OQO)
such as; polyoxyalkylene polyhydric alcohol fatty acid esters, such as sorbitol lauret) EOQ, and castor oil EO (30); polyoxyalkylene alkyl ethers, such as C6-20 Ziegler alcohol EO (81).

Octyl alcohol EOQω, coconut oil reduced alcohol E
O (51 etc.; polyoxyethylene polyoxybrobylene broth copolymer; polyoxyalkylene fatty acid ester, such as oleic acid and polyethylene glycol (
Mono- or diesters with molecular weight 600), stearic acid EO(15), lauric acid EOα0), etc.;
Polyoxyalkylenealkylamines, such as stearylamine EO (Iω, etc.); polyoxyalkyl mercaptans, such as cetylmercaptan EO (Iω, etc.); alkylolamide nonionic surfactants, such as lauric acid jetanolamide EO (41, etc.); Hydrolic alcohol fatty acid esters, such as lauric acid monoglyceride, sorbitan stearate, sorbitan oleate, sucrose stearate, etc.; the terminal hydroxyl group of the polyhydric alcohol fatty acid ester and the above nonionic emulsifier is an alkoxyl group, acyloxy group, or alkylcarbamoyl group Examples include compounds substituted with etc. As the emulsifier, the various compounds mentioned above may be used as a mixture.

The mixed liquid flow in the method of the present invention basically consists of a mixture of the above-mentioned sizing agent and emulsifier, but an emulsifying agent or the like may be added as necessary.

Here, examples of the emulsifying aid include hydrolysates of the sizing agents mentioned above, such as alkenylsuccinic acid,
Further examples include octylcarboxylic acid.

Further, the ratio of each component constituting this mixed liquid flow may be appropriately selected depending on the type of compound used, the conditions for producing the emulsion, etc., and is not particularly limited.

A preferred ratio is 97 to 65% by weight of the sizing agent.

The emulsifier ranges from 3 to 15% by weight and the emulsifying aid from 0 to 20% by weight.

In the method of the present invention, a mixed liquid composed of such components is caused to flow through a circular pipe, etc., and the formed mixed liquid flow is controlled so that turbulence is formed in the pre-formed water flow. supply Various methods can be considered to form a turbulent flow by supplying a mixed liquid flow into a water stream, but for example, a mixed liquid flow is supplied into a water stream in the same direction as the water flow and at a different flow rate. This can be done by doing. More specifically, this is carried out using the apparatus shown in FIGS. 1 and 2. In other words, in the water flow 3 flowing through the circular pipe 1,
0.1 to 0.6 times the inner diameter of the circular tube 1, preferably 0.
A mixed liquid flow 4 flowing in a circular tube 2 having an inner diameter of 2 to 0.5 times is caused to flow from approximately the center of the cross section of the water flow 3 in the same direction as the water flow and 0.1 to 0.5 times the inner diameter of the water flow. 8 times, preferably 0.2 to 0.5 times or 1.5 to 10 times, preferably 2 to to create the desired turbulence.

When the filter water flow and the mixed liquid flow are combined to form a turbulent flow, a sizing emulsion consisting of an emulsion in which sizing agent particles having a particle size of 1 to 3 μm are dispersed in water is produced. The apparatus used here is, for example, the one shown in FIG. 1 or FIG. 2, but is not limited thereto. In short, it is sufficient that the water stream and the mixed liquid stream flow in the same direction but at different speeds, a turbulent flow is formed at or after the confluence, and an excellent emulsion for size is produced. According to Fig. 1, a water flow 3 flowing inside a circular pipe l with a step in its inner diameter is
A mixed liquid stream 4 is merged into a water stream 3 through a circular tube 2 with a small inner diameter coaxially inserted into the circular tube 1 in the vicinity of passing through the circular tube from a portion with a large inner diameter to a portion with a small inner diameter. On the other hand, in FIG. 2, a mixed liquid stream 4 is made to join a water stream 3 flowing in a normal circular tube 1 from a circular tube with a small inner diameter inserted coaxially into the circular tube 1. In either case, the water flow 3 and the mixed liquid flow 4 at the time of merging have the same flow direction but different flow velocities. The flow velocity ratio of the two streams varies depending on the inner diameter of the pipe, the shape of the pipe, etc. and cannot be determined uniquely, but in short, it is sufficient that turbulent flow is formed at the confluence point or downstream thereof. Specifically, the flow rate of the mixed liquid flow should be made 1.5 to 10 times faster than the water flow, or
Alternatively, the speed may be reduced to about 0.1 to 0.8 times. In addition, the ratio of the inner diameters of the circular pipe 1 through which water flows and the circular pipe 2 through which the mixed liquid flows varies depending on the speed ratio of the water flow and mixed liquid flow and various conditions, but usually the inner diameter of the circular pipe 2 is the inner diameter of the circular pipe l. 0.1 against
It may be set to about 0.6 times. Further, there is no particular restriction on the insertion position of the circular tube 2 with a small inner diameter inserted into the circular tube 1 with a large inner diameter, but it is assumed that both circular tubes 1 and 2 are coaxial, in other words, the cross-sectional shape of both circular tubes 1 and 2 is A value of 1 is preferable so that the lines are concentric.

In merging the water stream and the mixed liquid stream under the above-mentioned positions and conditions, it is preferable that the proportion of water be 1000 to 30,000 parts by weight per 100 parts by weight of the mixed liquid. The turbulent flow formed by merging the two flows should have a Reynolds number of 2,300 or more, preferably 2,500 or more, although this will vary depending on the type of liquid mixture and the condition of the inner wall of the 1°2 circular tube.

Like soft soil, according to the method of the present invention, a size emulsion with very poor size performance can be efficiently produced with simple operations and with less energy.

Therefore, paper with excellent sizing effects can be obtained by using the sizing emulsion produced by the method of the present invention. Therefore, the method of the present invention can be effectively used in the paper manufacturing industry.

Next, the present invention will be explained in more detail based on examples.

Examples 1 to 3 The apparatus shown in FIG. 1 (D, = 2 cm, Dz = 1.
3e11. D: l=1.6 cm, D4=0.5
cm, L+=700 am.

Lz=11 Cm), a liquid mixture consisting of 100 parts by weight of a sizing agent and 7 parts by weight of an emulsifier shown below was flowed through a circular tube 2 as a mixed liquid stream 4 at a predetermined flow rate.

On the other hand, water is introduced from the inlet 5 into the circular pipe l, and this is water? M,
1, the mixture was flowed in the same direction as the mixed liquid flow 4, but at a different flow rate.

Sizing agent: Alkenyl succinic anhydride with a boiling point of 150 to 220°C obtained by reacting equimolar isobutylene oligomers having 12 to 20 carbon atoms and maleic anhydride at 220°C for 5 hours, followed by vacuum distillation at 1 mdg.

Emulsifier: Nonionic emulsifier (Product name: Inogen EA16
7, manufactured by Daiichi Kogyo Seiyaku ■) 0.15% by weight emulsion for size prepared by combining the mixed liquid stream and the water stream in the above device (value based on the pulp solid content. The same applies hereinafter), fixing agent (cation) sexual starch) 0.
80% by weight, filler (heavy calcium carbonate) 20.0
A mixture consisting of 0.03% by weight and retention aid (cationic polyacrylamide) was mixed into a 0.5% by weight hardwood bleached sulfate pulp suspension adjusted to 7.5% by weight of sodium bicarbonate. added to.

Next, the above pulp suspension is passed through a hand-pulling device (JIS).
Freeness 408m 12(
JIS P8121), basis weight 80g/rrf,
Dry at 110'C.

Paper was manufactured under the conditions of 2 minutes (rotary dryer) and paper Comparative Example 1 The same operation as in the example was performed except that the flow rates of the water flow and the mixed liquid flow were made the same.

The results are shown in the table.

Comparative Example 2 300 ml of water was put in a 500 ml beaker, and while stirring this water with a high speed mixer (1200 rpm), the same sizing agent (1.5 g) and emulsifier (0.105 g) as in the above example were added. After adding all of the following, stirring was continued for 5 minutes to prepare a size emulsion.

Subsequently, using the obtained emulsion for size, paper sheets were obtained in the same manner as in the examples. The results are shown in the table.

table

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams showing an apparatus used in the method of the present invention. In the figure, ■, 2 indicates a circular pipe, 3 indicates a water flow, 4 indicates a mixed liquid flow, and 5 indicates an inlet. Figure 1 request Figure 2 procedural amendment (voluntary) December 10, 1985

Claims (1)

[Claims] 1. When producing a sizing emulsion whose main components are a sizing agent, an emulsifier, and water, a turbulent flow is formed in the water flow of a mixed solution whose main components are a sizing agent and an emulsifier. A method for producing an emulsion for size, characterized in that the emulsion is supplied as follows. 2. A circular tube (1) having an inner diameter 0.1 to 0.6 times the inner diameter of the circular tube (1) is inserted into the water flow that fills and flows inside the circular tube (1).
2) A mixed liquid flow containing a sizing agent and an emulsifier as main components flowing through the interior of the water flow is directed from approximately the center of the cross section of the water flow in the same direction as the water flow and 0.1 to 0.8 times the water flow or 1 .5
2. The method of claim 1, wherein the turbulent flow is created by feeding at a rate of ~10 times.