DE1036429B - Process for producing a dry glue, especially for paper sizing - Google Patents

Description

In order to make paper writable, it is glued, in addition to the surface sizing of the paper web with animal glue, casein, etc., to a much greater extent, the fabric glueing is used in which the sizing agent is added directly to the paper pulp from which the paper web is subsequently formed. The main sizing agent used for sizing in bulk (fabric sizing) is rosin, which is also used aqueous soda solution or sodium hydroxide solution "saponified", i.e. according to the formulas

2C ₁₉ H ₂₉ COOH + Na ₂ CO ₃

> 2C ₁₉ H ₂₉ COONa + H ₂ O + CO ₂

respectively.

C ₁₉ H ₂₉ COOH + NaOH > C ₁₉ H ₂₉ COONa + H ₂ O

was converted into the sodium resinate. Will be doing soda or sodium hydroxide is used in theoretical amounts, so-called fully saponified resin glue is obtained; will If you use less than the theoretical amount, so-called free resin glues are formed which unsaponified resin forms an emulsion with saponified parts, whereby the saponified part, the sodium resinate, acts as an emulsifier.

The glues formed in this way are about 30 to 50% strength Emulsions produced, in which form they are sold or used.

After adding the glue emulsion to the paper pulp, the resinate is precipitated by adding alumina sulfate, according to the following formulas:

₁₉ H ₂₉ COONa

Al ₂ (SO ₄ I ₃ + 6H ₂ O
> 6 C ₁₉ H ₂₉ COOH + Al ₂ (OH) ₆ + 3 Na ₂ SO ₄

6C ₁₉ H ₂₉ COONa + Al ₂ (SOJ ₃

> 2Al (C ₁₉ H ₂₉ COO) ₃ + 3Na ₂ SO ₄

The required amount of alumina sulphate for 1 kg of fully saponified resin glue is about 1 ¹ ₂ kg, and naturally somewhat less for 1 kg of free resin glue, ie about 1 kg.

The production of resin glue, which used to be mostly done by the paper mills themselves, is increasingly being taken over by suppliers. Saponified rosin sizes are usually owned as 30%, delivered free resin emulsions than 50 ° / _o aqueous emulsions in barrels, tanks and tank trucks. However, the high water content of these glues makes transport more expensive; In addition, there is a risk of freezing out in the cold season, which is why the need for a suitable dry resin glue arose.

Method of manufacture

a drying glue, in particular

for paper sizing

Applicant:

A. Schneider G. mb H.,
Konolfingen-Dorf, Bern (Switzerland)

Representative: Dr. H. Wittek,
Patent attorney, Heidelberg-Schlierbach, Im Grund 20

Claimed priority:
Switzerland from February 4, 1957

Alfred Schneider, Konolfmgen, Bern (Switzerland),
has been named as the inventor

For the production of such dry resin glue, it is known to use fully saponified resin glue, possibly with additives water-repellent substances, too dry in the spray process or on a drum dryer. By such Drying processes, the drying glues are very much more expensive; they are also against humidity more or less sensitive. In addition, the process is obvious for reasons that are apparent to the person skilled in the art Can not be carried out with free resin glues, which are preferred for paper production in and of themselves, because they are more economical in the consumption of alumina sulphate than fully saponified glues. For these reasons The known dry resin glues were not able to satisfy.

On the other hand, liquid resin glues are known which, in addition to rosin, contain larger amounts of hydrocarbons contained in emulsified form. Hydrocarbons were used to produce dry glues but not yet known.

The present invention now relates to a method for producing a dry resin glue, which thereby is characterized in that one rosin with about 0.5 to 5 percent by weight (with respect to the rosin) of a liquid hydrocarbon and about 15 to 30 percent by weight (with respect to the rosin) Sodium aluminate mixed. During or after mixing, an elevated temperature can be used.

809 597/518

3 4

the; You can also use the mixture during or after first-class resin glue, calculated on dry matter,

Add water to the mixing, which is then reduced again at least 30 ° / ₀ . The glue according to the invention is practically

is steaming. The properties of the product are, depending on the table, insensitive to the hardness components of the

according to these different embodiments of the water, humidity and high dry temperature

position procedure, somewhat different. As a liquid 5 doors. It is readily soluble in cold water. He spreads out

Hydrocarbon, in particular, light petrol comes in well and quickly in the paper pulp and is in neutral

Question, the amount of which, however, can be precipitated due to the smell due to 5 ge environment.

weight percent, based on the resin, do not exceed g · _j _e i ι

target. The sodium aluminate is preferably in a '

Amount of 25 percent by weight with respect to the resin i ° In an open melting kettle with steam jacket and

used. Agitator of the usual design is 100 kg KoIo-

If the mixing is carried out cold and in the absence of phonium, melted with 2 to 3 liters of light petrol and heated to water, for example by continuous or batchwise at most 95 ° C. The components are milled in portions in a ball or 25 kg of dry, finely ground sodium aluminate to the melt. Rod mill, a somewhat hygroscopic ¹ S is obtained. After further stirring for about 15 minutes, powder is removed. This represents a very cheap and usable one empties the resulting melt. It solidifies, depending on the dry glue with good sizing effect is that before resin places at about 45 to 5O ⁰ C completely to form the use, that is before addition to the paper pulp, with a brittle clinker. This will have to be mixed with water in a hammer mill. The powder represents a finely ground, sifted and packed in paper sacks,
A physical mixture. In the presence of moisture, the dry glue is used before the addition, reactions between the sodium aluminate and the pulp, dissolved in cold water, and the rosin, which, however, are undesirable. 30 parts dry glue 70 parts water used. It is

A better moisture resistance is achieved if a stable colloidal solution is available with extraordinarily

if you fry the glue powder at about 8O ⁰ C and the high glue power. For 1 kg of dry glue, 300 to

the resulting clinker-like product then requires 25 500 g of aluminum sulfate again,

married. Apparently the sodium aluminate. .

particles covered by rosin. Example 2

A dry glue of the same quality is given 100 kg of rosin in the form of small chunks if you melt the resin and light petiol, 2 liters of light petrol are added to them and 25 kg of sodium melt stir in the sodium aluminate and grind the solidified 3 ° trium aluminate in a ball mill. That melts away crushed. standing powder is sifted and packaged.

The addition of water during or after mixing This dry glue is in the application and in the

has the effect that not only a physical mixture has the same effect as that produced according to Example 1

but that chemical reactions also occur. Glue. As a powder, however, it is somewhat more hygro-

It is believed that a mixture of a 35 scopic.

smaller part of sodium resinate and a larger part of Example 3
colloidal aluminum resinate, whereby the sodium

resinat acts as a protective colloid. 100 kg of resin produced in this way are combined with 2 kg of light petrol and 25 kg

Dry resin glues can be ground to the paper pulp in dry sodium aluminate. The resulting glue

State be added must therefore before Verwen- 40 powder is then fritted at about 8O ⁰ C. It

can no longer be stirred up with water. After cooling, a clinker is formed, which is finely

The same reactions that are ground down during manufacture.

of the dry resin glue with the addition of water, the finished dry glue has the same properties

occur in the case of the product prepared in the absence of water such as the product prepared according to Example 1.

Product if you have used it with ⁴⁵

W ater ^T stirs so that in all embodiments in .Example 4

At the moment the product is added to the paper pulp, at least 100 kg of resin are mixed with 2 kg of light petrol and 25 kg

at least part of the rosin in the form of aluminum-sodium aluminate finely ground and in a kneader with

sodium resinate and some sodium resinate are present. As a result, kneaded 30 liters of water. The formed dough will be at about

The large proportion of aluminum resinate, the glue falls 50 80 ° C, dried and ground.

_{100 ^ 0} Ig on the paper even in an alkaline environment. An addition of aluminum sulfate, as it is more expensive than the products required by the known sizing process in the case of borrowed drying processes, is not mentioned in the preceding examples; but he has the advantage of being required. It is advisable, however, not to have to add a little aluminum sulfate to glues when used in the paper mill for correction, but rather to add it to the paper pulp in the production water and to neutralize the dry fiber state. The glue mixture, since free alkalis damage the paper, which effect is the same as the effect described above due to the hydrolyte products in aqueous solution.

strong acidic aluminum example 5 is known to occur in the same way as the cleavage

sulfate is canceled, with larger amounts also being 60

Form of aluminum hydroxide, probably as 100 kg rosin are finely ground and with

Carry the glue particles in finest distribution on the 21 petrol and 25 kg sodium aluminate in a vessel

Brings fibers and thereby the sizing process under- agitator dissolved in 250 l of cold water. It creates a

supports. Dispersion on the roller or in the spray dryer

In addition to the approximately 50 "/ g savings in precipitation, 65 is dried and then ground. This

medium (aluminum sulfate), which can also be used with the dry glue according to the invention without prior dissolving in

resin size is achieved, this is to be added to the paper stock compared to the dry state,

Common products are also more economical in themselves. This production method is, however, despite its simplicity

Consumption. To achieve an equivalent sizing due to the large amount of water to be evaporated

the saving compared to a conventional 70 is more expensive than that according to Example 4.

The dry glue according to the invention can of course also iüT all purposes can be used for which rosin glue has been used up to now has been used with success.

Claims (5)

PATENT CLAIMS: 1. A method for producing a dry glue, in particular for paper sizing, characterized in that that one rosin with about 0.5 to 5, preferably 2 percent by weight of a liquid Hydrocarbon and 15 to 30, preferably 25 percent by weight sodium aluminate, both based on the amount by weight of rosin, mixed. 2. The method according to claim 1, characterized in that the mixing with heating to at most 95 ° C takes place. 3. The method according to claim 1 or 2, characterized in that the mixing in the presence of makes so much water that a dispersion is formed, which is then dried. 4. The method according to claim 1 to 3, characterized in that the mixture is subsequently carried out Heating to 80 ° C is fritted. 5. The method according to claim 1, 2 or 4, characterized in that the mixture is subsequently knead with a little water and then dry. 809 597/518 8 '.