Glue stein hall with high content of dry matter and method for preparing glue stein hall with high content of dry matter

FIELD: glue materials.

SUBSTANCE: invention relates to a method for preparing glue Stein hall with the high content of dry matter by using a single mixing capacity and comprising the following steps: 1) preparing a carrier by gluing the first part of starch in medium containing part of alkali necessary for preparing the glue; 2) diluting a carrier with water followed by addition of at least lesser part of the second part of starch; 3) addition of remaining part of the second part of starch and remaining part of alkali in diluted form that is necessary for preparing the glue. Addition of remaining the second part of starch and alkali is carried out in stages. Invention provides preparing the glue with the high content of dry and simplifying technology for its preparing.

EFFECT: improved preparing method.

10 cl, 2 ex

 

The invention relates to a method for producing the adhesive Stein Hall, which includes stages:

- receiving portion of the carrier as a result of gelatinization in alkaline medium, at least part of the total amount of starch in the glue;

- dilution portion of the carrier a certain amount of water;

add the remaining secondary starch,

where in the first stage mentioned portion of the carrier obtained using parts of alkali, and the second stage portion of the medium is diluted with some water and then adding at least a portion of the secondary starch.

The invention additionally relates to glue Stein Hall with high dry matter content (also called concentrated glue or adhesive Stein Hall), obtained according to the above method.

Adhesives based on starch are well known in the industry for the manufacture of corrugated cardboard. Among the adhesives used the most popular adhesives are related to the type of Stein Hall.

Adhesives Stein Hall in the General case known as adhesives, containing a portion of the carrier of the adhesive, which is obtained as a result of gelatinization under the action of caustic soda, approximately 10-20% of the full amount of starch in the glue. The resulting paste is then cooled and diluted with water, and the remaining starch after that add in the de granular native starch. Also add borax (1.5 to 2.5%).

Under these conditions the maximum concentration of starch in these compositions related to the type of Stein Hall, does not exceed 25%, although reported values up to 30-37% (based on dry weight. Higher values were obtained when the viscosity of the medium was reduced as a result of the oxidation reaction and the like.

The lack of data of dilute adhesives is that they contain significant amounts of water, reducing the rate of adhesion and complicates the drying of the adhesive on the stage of adhesion. In addition, the adhesives with a higher solids content in the result, reduce energy consumption, because evaporate will need smaller amounts of water.

Therefore, the desired higher concentration of starch in the glue. But we also know that when using starch as a binder has a limit of maximum amount of starch that can be used. When higher quantities of starch, the amount of water is insufficient to guarantee the desired adhesion, while the viscosity of the adhesive becomes too high.

Highly concentrated glues based on starches disclosed in the prior art. In EP 0038627 describes adhesive based on starch, which SOS is the RTO from fully castelsilano fractions of starch and partially bulked fractions of starch with a ratio of from 0.2:100 to 2:1. The adhesive may contain from 10% to 40% of a hard phase of starch based on the dry weight. Clusterseven the fraction is obtained by carrying out heat treatment at 95° (C or above, and not as a result of mixing with concentrated alkali, as in classical composition Stein Hall. In fact, it is a glue relating to the type of adhesives without the media to which to improve the adhesiveness of the adhesive while wet, add fraction castelsilano starch.

In EP 0576221 describes adhesive compositions containing from 15 to 35% (wt.) solid phase starch. A significant amount of starch is in a partially swollen state (preferably from 20 to 50%).

In EP 0376301 describes adhesive, obtained by treatment of a suspension of starch in the jet digester at a temperature of from 120 to 200°obtaining castelsilano dispersion. Then to this castelsilano dispersion type deklassirovanniy faction. Full the solids content of the starch in the composition, as illustrated in the examples, ranging from 32%to 40%.

In GB 1571336 also describes a method of obtaining a water-based adhesives, starch. In this way a portion of the carrier is obtained from castelsilano molecular dispersed starch at a solids content from 3% to 40% (wt.) by cooking the starch suspension is using a jet digester. A portion of the carrier after it is mixed with a suspension neclaustridialnah starch. To the resulting mixture add the lye.

The adhesives described in these applications are not typical compositions Stein Hall.

In EP 1101809 describes adhesives based on starch with a high content of dry matter, containing at least 40%, preferably at least 46% of dry matter. This high content of dry matter is obtained by adding to glue starch-based inorganic salts, preferably calcium carbonate. The ratio of starch/filler preferably at least 60:40. The adhesive may be a type of Stein Hall, without media or Minocar.

In EP 0409240 describes a highly concentrated adhesive in the form of starch suspension containing from 20 to 60% (wt.) solid phase starch. Glue stabilized by adding gums, such as xanthan gum or Rusanova gum, and a quantity of sodium hydroxide.

In WO 9850478 describes adhesive compositions with a high content of dry matter, which contain significant amounts of water-soluble alkaline silicate together with starch, brown and sodium hydroxide. In the examples described adhesive compositions containing up to 45% of the solid phase.

Part of the above-quoted documents preaches the existing level of technology does not apply to adhesives type Stein Hall, it documents, such as EP 0038627, EP 0576221, EP 0376301 and EP 0409240.

Two other cited document, that is, EP 1101809 and WO 9850478 may include adhesives, related to the type of Stein Hall, but they differ significantly from the standard compositions in that they contain material of an inorganic filler, which contributes to the high dry matter content in the adhesive.

State of the art described, and other adhesives with high dry matter content related to the type of Stein Hall.

In the US 3912531 describes adhesives with high dry matter content related to the type of Stein Hall, containing up to 40% (wt.) the solid phase of starch.

However, the disadvantage of this type adhesives Stein Hall with a high content of dry matter is that they get when using as a starch carrier or part of the starch carrier fluid starch, the fluidity of which is from 25 to 90.

In EP 0049009 also describes adhesives with high dry matter content related to the type of Stein Hall. The problem that caused the development of this patent document, is to get the final adhesive with a high content of dry substance whose viscosity is not substantially increased, and consequently the mixture is still can be pumped by the pump. In fact, the glue must be defined the military stability properties during storage and can be characterized by a suitable processing viscosity.

In the patent document States that the adhesives with high dry matter content can not be obtained by the commonly used technologies for adhesives, related to the type of Stein Hall (which are characterized by low content of dry matter). As described above, the way get these types of adhesives are related to the type of Stein Hall, includes obtaining media and then dilute it with decreasing basicity. If the principal does not decrease, it will have a negative impact on adding a secondary starch and as a result will lead to swelling of the granules and unstable viscosity.

However, if you want to get adhesives with high dry matter content, to prevent undesired swelling dilution becomes insufficient. In addition, the combination of a less diluted medium and high concentrations of secondary starch will result to obtain a composition, which would be no more suitable for processing.

The solution to this problem, which is proposed in the application EP 0049009 is the oxidation of a portion of the carrier, and then the oxidized starch gelatinization in the presence of the required quantity of sodium hydroxide, thereby to reduce the viscosity of the medium to a value that will make it possible to add the required number of Deuteronomy is knogo starch. This secondary starch then add to get the glue with a dry matter content of 40%. It must be emphasized that portion of the starch carrier in the adhesive is more than 14% of the dry substance of the starch present in the adhesive.

The disadvantage of this method is that adhesives with high dry matter content get if you want to use in the faction media starches with lower viscosity.

The starches with lower viscosity referred to in the patent documents of contemporary art, are usually liquid starch or oxidized starches, where fluid starches receive as a result of chemical or enzymatic degradation.

In the US 6048391 describes a method of obtaining adhesive based on starch for the manufacture of corrugated cardboard. The method is carried out in a system that includes a first and a relatively large mixing vessel provided with an agitator. The second and smaller mixing tank connected to the first mixing tank via the recirculation channel. The second and smaller mixing tank equipped with means of creating shear forces, which exceeds the shear force generated in the first and greater mixing tank. The method is carried out in two stages. In the first stage are water and starch to produce in the first the mixing tank media and after that, the resulting carrier is transported to the second mixing tank. The second mixing container first, in a controlled way to add liquor to obtain a carrier. In the second stage to the media in a small pot add a further quantity of starch, water, borax and the second dose of liquor.

The disadvantage of this system is that used for additional mixing capacity, where you enter the circuit. Thus, it is technically more difficult and more expensive system. In addition, the adhesives Stein Hall obtained by this method do not have a high dry matter content.

The aim of the invention is to develop a method of producing adhesive Stein Hall, allowing to overcome the above mentioned disadvantages.

This is achieved using a method of producing adhesive Stein Hall, which includes stages:

- receiving portion of the carrier as a result of gelatinization in alkaline medium, at least part of the total amount of starch in the glue;

- dilution portion of the carrier a certain amount of water;

add the remaining secondary starch,

where in the first stage mentioned portion of the carrier obtained using parts of alkali, and the second stage portion of the medium is diluted with a certain amount of water followed by d is the deliverance, at least portions of the secondary starch, where the adhesive Stein Hall with a high content of dry matter is obtained using one mixing tank, where in the first stage mentioned portion of the media get in one mixing tank, and in the third stage, the remaining alkali is added in diluted form, together with the secondary starch.

In a preferred variant of the method according to the invention the addition of the remaining secondary starch and alkali spend Paladino.

The advantage of this variant lies in the fact that the secondary starch is not directly exposed to excessively high concentrations of alkali, thus preventing premature swelling of the secondary starch.

In a more preferred variant of the method according to the invention the addition of alkali and the starch is carried out at least in two stages.

In one embodiment of the method according to the invention in the first stage receive a portion of a carrier containing from 2 to 9% of the total starch content in the mixing starch with water and lye until then, until all the starch will not be clusterseven.

In one embodiment of the method according to the invention in the first stage, the alkali content in the portion of the carrier is usually less than 2/3 of the total number required to obtain the adhesive composition.

In one embodiment, the JV the soba according to the invention in the second stage portion of the medium is diluted with water, relevant 60-85% of the volume of the media.

In one embodiment of the method according to the invention in the second stage, add 50 to 75% of the secondary starch.

In a preferred variant of the method according to the invention after the third stage add borax.

The advantage of this variant lies in the fact that the improved initial adhesion and regulated as water retention, and the ability of the adhesive to penetration (penetration).

The purpose of the invention, moreover, can be achieved by developing glue Stein Hall with high dry matter content obtained by the method described above, where

the glue contains from 32 to 45 percent native or stabilized starch;

the ratio of quantities of starch carrier and the secondary starch is from 1:50 to 1:11;

the viscosity Bauer glue is from 21 seconds to 60 seconds;

the concentration of alkali in the adhesive sufficient to ensure SGP (gelation temperature of the starch in the range from 45°to 53°C.

In the preferred glue Stein Hall with a high content of dry matter, corresponding to the invention, native or stabilized starch is produced from starch crops, tubers or roots.

The method of producing adhesives according to the invention includes several stages:

during the first stage receive a portion of the media containing about is 2 to 9% of the total starch content, in the mixing starch with water and lye until then, until all the starch will not be clusterseven. The alkali content in the portion of the carrier is usually less than 2/3 of the total number required to obtain the composition of the adhesive;

during the next stage portion of the medium is diluted with a volume of water corresponding to 60-85% of the volume of the medium, and then adding at least half and at most 75% of the secondary starch;

then at a later stage add the remaining alkali in diluted form, together with the secondary starch.

Add the remaining starch and alkali can be carried out simultaneously or sequentially (Paladino). If adding to hold simultaneously, then care must be taken not to expose the starch direct effects of alkali.

During stepwise added to the mixture of the first and subsequent stages, first add alkali, followed by adding the remaining secondary starch. Stepwise addition of alkali and starch preferably is carried out in two or more stages.

In conclusion, add borax, completing the manufacture of glue.

Adhesives with high dry matter content related to the type of Stein Hall according to the invention are characterized by the following properties:

contain from 32 to 45 percent native lib is stabilized starch,

the ratio of starch carrier and the secondary starch is from 1:50 to 1:11,

the viscosity Bauer is from 21 seconds to 60 seconds,

and the concentration of alkali in the adhesive sufficient to ensure SGP in the range from 45 to 53°C.

Native or stabilized starch can be obtained from starch crops, tubers or roots. Their typical examples are, for example, the starch obtained from maize, wheat, barley, potato, tapioca or arrowroot, including waxy starches and starches related to the type with a high content of amylose.

Stabilized starches mentioned in the application correspond to the starches, which was subjected to physical and/or chemical processing in order to obtain starches, which are less sensitive to alkali at room or slightly higher temperatures. As a result, they are not exposed to uncontrollable premature swelling and/or gelatinization.

Advantage adhesives Stein Hall with a high content of dry matter according to the invention and obtained according to the method according to the invention is that the retrieval method avoids the use of the fraction of the carrier starches with low viscosity adhesives still have excellent storage stability and are suitable for processing value and viscosity. They contain only native or stabilized starches. In addition, get the ultimate glue with high dry matter content, which can be pumped by the pump.

The invention will be further illustrated in the following examples, which should not be construed as limiting the scope of the invention as such and expressed in the following claims.

Example 1

Adhesive with high dry matter content was obtained as follows.

In a volume of 2000 l first received a fraction of the media. So 16 l NaOH solution with a concentration of 30% (wt./wt.) was mixed into the dispersion containing 28 kg of stabilized starch wheat and 650 liters of water. The mixture was stirred using a stirrer with large shear effort at 1500 rpm for 10 minutes, allowing the starch to klasterizatsiya. The starch in the faction media was 3.25% of the total starch content in the adhesive (ratio 1:30).

At the next stage to the medium was added 550 litre of water with 500 kg of stabilized wheat starch and 3 kg of borax. All together was stirred at 1500 rpm for 5 minutes.

Before adding the remaining alkali and starch remaining 12 l NaOH solution with a concentration of 30% (wt./wt.) first diluted in 100 l of water.

After that capacity was added 37 l diluted the OI alkali followed by the addition of 200 kg of stabilized wheat starch. This mixture was stirred for 5 minutes before adding the second portion in the form of 37 l of alkali and 138 kg of starch. Again the mixture was intensively stirred. In conclusion, when mixing the glue was added to the remaining 38 l of alkali and 6.5 kg of borax.

The thus obtained adhesive composition contained 40% (wt.) solid phase starch and consisted of the following:

Water1300 l
Starch866 kg
Volume1820 l
NaOH6.25 g/l
Boraxa total of 5.21 g/l

Thus obtained adhesive had the following properties:

PropertyDirectly after receivingAfter 30 minutesAfter 6 hours
Viscosity according to Bauer (seconds)222527
The viscosity Brookfield (Masek, 20 rpm)480500710

SGP 47°C.

Example 2

This example describes adhesive containing 40% (wt.) the solid phase of maize starch. In the collection volume of 1500 l 440 l water were dispersively 24 kg of maize starch. To this dispersion was added 12 kg of NaOH solution with concentration is set to 33% (wt./wt.) and the mixture was stirred, using a mixer with large shear effort, for 12 minutes at 1500 rpm Starch in the faction media was 4.2% of the total starch content in the adhesive (ratio 1: 24).

At the next stage was added 320 l of water followed by the addition of 4.5 kg of borax and conducted intensive stirring for 3 minutes. Then to fractions of medium was added to 300 kg of starch and homogeneous them it was dispersively in the mixing at 1500 rpm for 3 minutes. Before adding the remaining alkali and starch this additional fraction of alkali (10 kg 33%NaOH) was diluted in 100 l of water.

Thus, the receiver was added 37 l dilute alkali and then adding 151 kg of stabilized starch maize and perform the mixing at 1500 rpm for 3 minutes. Then added the second portion of alkali, followed by addition of 100 kg of starch and perform the dispersion. In conclusion, under stirring was added the remaining 35 l of alkali together with 4 kg of borax.

Thus, the obtained adhesive composition contained 40% (wt.) solid phase starch and consisted of:

Water860 l
Starch575 kg
Volume1200 l
NaOH6.25 g/l
Borax/td> 6.25 g/l

Thus obtained adhesive was discovered the following properties:

PropertyDirectly after receiving
Viscosity according to Bauer (seconds)48
The viscosity Brookfield (Masek, 20 rpm)1600

SGP 48,5°C.

1. A method of obtaining a glue Stein-Hall with a high dry matter content using one mixing tank, which includes stages:

getting media by the gelatinization of the first part of the starch in the medium containing portion of the alkali required for receiving the adhesive;

dilution of the medium with water and then adding at least part of the second part of the starch;

adding the remaining part of the second part of the starch and the remaining part in dilute alkali as necessary to obtain glue.

2. The method according to claim 1, wherein adding the remaining second part of the starch and alkali spend Paladino.

3. The method according to claim 2, characterized in that the addition of the remaining second part of the starch and alkali carried out at least in two stages.

4. The method according to any one of claims 1 to 3, characterized in that the first stage carrier containing from 2 to 9% of the starch from the total amount of starch, receive p is the mixing starch with water and lye until until all the starch will not be clusterseven.

5. The method according to any one of claims 1 to 3, characterized in that in the first stage, the amount of alkali in the media is usually less than 2/3 of the total number required to obtain glue.

6. The method according to any one of claims 1 to 3, characterized in that in the second stage, the medium is diluted with a volume of water corresponding to 60-85% of the volume of the media.

7. The method according to any one of claims 1 to 3, characterized in that in the second stage, add 50 to 75% from the second part of the starch.

8. The method according to any one of claims 1 to 3, characterized in that at the end of the third stage additionally add borax.

9. Glue the Stein-Hall with a high content of dry matter obtained according to the method according to any one of claims 1 to 8, characterized in that it contains

from 32 to 45 percent native or stabilized starch;

the ratio of the first part of the starch and the second part of the starch is from 1:50 to 1:11;

has a viscosity Bauer from 21 to 60; and

the concentration of alkali in the adhesive sufficient to ensure that the gelation temperature of the starch from 45 to 53°C.

10. Glue the Stein-Hall with a high content of dry matter according to claim 9, characterized in that the native or stabilized starch is obtained from cereals, tubers or roots.



 

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