CA1116353A - Method for the manufacture of water soluble adhesives - Google Patents
Method for the manufacture of water soluble adhesivesInfo
- Publication number
- CA1116353A CA1116353A CA000309740A CA309740A CA1116353A CA 1116353 A CA1116353 A CA 1116353A CA 000309740 A CA000309740 A CA 000309740A CA 309740 A CA309740 A CA 309740A CA 1116353 A CA1116353 A CA 1116353A
- Authority
- CA
- Canada
- Prior art keywords
- water
- flow
- solids
- adhesive solids
- mixing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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- Adhesives Or Adhesive Processes (AREA)
Abstract
SP-641.l AN IMPROVED METHOD FOR THE MANUFACTURE
OF WATER SOLUBLE ADHESIVES
Abstract of the Disclosure An improved method for continuously and automatically preparing water soluble adhesives for use in coatings is disclosed. A continuous flow of water is heated, an anti-foam agent is added into the flow of water, the solids base for the adhesive is admixed into the flow at a predetermined level and an alkali cutting agent is added directly into the flow.
OF WATER SOLUBLE ADHESIVES
Abstract of the Disclosure An improved method for continuously and automatically preparing water soluble adhesives for use in coatings is disclosed. A continuous flow of water is heated, an anti-foam agent is added into the flow of water, the solids base for the adhesive is admixed into the flow at a predetermined level and an alkali cutting agent is added directly into the flow.
Description
Background of the Invention This invention relates generally to a method ~or continuously slurrylng adhesive solids ln an aqueous medlum, cooking and cuttlng the slurry wlth an alkali cutting agent so as to disperse the solids and thereby create a homogenous water soluble adhesive for use as a coating binder.
In the past it has always been advantageous to purchase coating lngredients in dry form because of con-siderable savings on freight and energy. Previously, however, the manufacturer of the coatlng adhesive would prepare ~he formulatlon onsight in a batch-wise system. The dry powder was added to water with agitation and heated ln a steam ~acketed vessel or by sparglng steam dlrectly into the slurry. There ~as a wetting-in period of approximately 5 minutes. At the end of the wet-in period, a suitable alkali was added to the slurry and the temperature of the mixture was ad~usted to between 140 and 160F. while the slurry was mixed for approximately 30 minutes.
There were several drawbacks to that method. Clearly, it was cumbersome and time consuming, but more importantly the method permltted manufacture of an adhesive which was limited to no more than 14 to 18% solids. A large reaction vessel was essen-tial, and an unduly long heatlng period was necessary, accurate and reproducible mixtures were infrequent and an energy demand was placed upon the batch system ln which the reaction took place.
In accordance with this lnvention, lt is possible to ellminate the manual batch-wise operations. It is also posslble to accurately reproduce the mixtures on a contlnuous basls.
Summary of the InventiGn In one broad aspect, the invention comprehends an improved method for preparing water soluble adhesives, which method comprises the steps of heating a continuous flow of water to a predetermined -temperature relative to cooking adhesive solids -to be added, subjecting the flow to a venturi flow pattexn, adding through the venturi into the heated flowing water ; an anti-foaming agent at a rate of from .01% to 5%
by weight of adhesive solids, subjecting the flowing water to vortex flow mixing conditions, and mixing adhesive solids to be rendered water soluble, the mixing being accomplished at the point of the vortex flow mixing to provide a solids level in the water of between about 5 to 25% by weight. Additional heat, if necessary, may be provided to promote cooking of the added adhesive solids. The method then includes injecting from about .01 to .04 lbs. of an aqueous alkali solution/lbs. of H20, the alkali solution serving to adjust the pH of the solution to greater than 8.5, and finally subjecting the flow to a static mixing action.
In the past it has always been advantageous to purchase coating lngredients in dry form because of con-siderable savings on freight and energy. Previously, however, the manufacturer of the coatlng adhesive would prepare ~he formulatlon onsight in a batch-wise system. The dry powder was added to water with agitation and heated ln a steam ~acketed vessel or by sparglng steam dlrectly into the slurry. There ~as a wetting-in period of approximately 5 minutes. At the end of the wet-in period, a suitable alkali was added to the slurry and the temperature of the mixture was ad~usted to between 140 and 160F. while the slurry was mixed for approximately 30 minutes.
There were several drawbacks to that method. Clearly, it was cumbersome and time consuming, but more importantly the method permltted manufacture of an adhesive which was limited to no more than 14 to 18% solids. A large reaction vessel was essen-tial, and an unduly long heatlng period was necessary, accurate and reproducible mixtures were infrequent and an energy demand was placed upon the batch system ln which the reaction took place.
In accordance with this lnvention, lt is possible to ellminate the manual batch-wise operations. It is also posslble to accurately reproduce the mixtures on a contlnuous basls.
Summary of the InventiGn In one broad aspect, the invention comprehends an improved method for preparing water soluble adhesives, which method comprises the steps of heating a continuous flow of water to a predetermined -temperature relative to cooking adhesive solids -to be added, subjecting the flow to a venturi flow pattexn, adding through the venturi into the heated flowing water ; an anti-foaming agent at a rate of from .01% to 5%
by weight of adhesive solids, subjecting the flowing water to vortex flow mixing conditions, and mixing adhesive solids to be rendered water soluble, the mixing being accomplished at the point of the vortex flow mixing to provide a solids level in the water of between about 5 to 25% by weight. Additional heat, if necessary, may be provided to promote cooking of the added adhesive solids. The method then includes injecting from about .01 to .04 lbs. of an aqueous alkali solution/lbs. of H20, the alkali solution serving to adjust the pH of the solution to greater than 8.5, and finally subjecting the flow to a static mixing action.
- 2 -,1"
~6;~3 Descrlptlon of the Drawing _ Flg. 1 is a flow dlagram of the process Or this invention.
Detailed Descrlption of the Preferred Embodim _ Re~errlng now to Flgure 1, ln accordance with the present invention, water is contlnuously heated (1) to pro~rid~
a temperature between 32F. and 212F., usually at a minimum -Or at least 130F. and preferably 160~F. The temperature must be sufficiently high to cook the adhesive solids, preferably protein. By "cooking" the solids one means ellmlnatlng small : gell particles. Nevertheless, excessive heatlng must be avolded : to prevent vaporization Or the water~ vapor lock in the product pump and interruptions in the flow pattern.
The water is then sub;ected to a venturl (2) rlow pattern as for example, through an inducer where an anti-foam agent is added at a rate of from about 0.01% to 5% by welght, based upon the dry weight of the adheslve solids. The antl-foam may be, for example, any of the commerclal llquld materlal.
:
- . :
Other additi~es which serve to modiry various characterlstics of the adhesive may be added in thls same fashion. The anti-roam and/or other addltives may or may not be necessary dependlng upon desired end use. Although the venturi flow addltlon is preferred, direct injection into the system wi-thout a venturl is acceptable.
The flow is sub~ected to vortex flow mixlng (3) as ror example, through a Tri-Blender~ at which point the adhesive solids are added to provide a solids level, in the water, of between about 5 and 25% by welght o~ water, pre~erably 20%
by weight 3 ( . 05 to .25 lbs/adhesive sollds/lb. H20). The adhe-sive sollds are preferably proteln, such as for example, hydrolyzed soy proteln isolate and casein. AIso~ starch may be utllized. The sollds should be ground into rree-rlowing form and o~ fairly consistent bulk density for most effectlve resul~s.
It is Or note that lf starch is utilixed, an additional heating means will be employed downstream from the point at whlch the starch is added. Thls is because the starch must be cooked at a temperature of at least 190F. but if the system is that hot prior to starch addltlon~ there ls a danger Or vapor lock in the vortex flow mixing the stage of the system.
By ~ortex flow mlxing it is meant that the protein and water are admixed with agitation and they come together in a vortex creating a more homogeneou~ mixture.
An alkali solution such as NH40H is dlrectly in~ected at (4) at a rate Or from about .01 to .04 lbs/lb H20. The precise rate ~ill vary depending upon the particu'ar alXali, its - burrering capacity and the partlcular characterlstlcs desired.
Provlded that a pH Or from about 8.5 to 10.0 is obtalned a sultable cutting actlon will occur. By cutting action it is meant that the lnsoluble protein wlll become solubl~. Typlcal , .
sP~4~
L63~, examples Or alkall are NH40H and NaOH. It is partlcularly preferred to use NH40H because there is little residual salt left in the coating.
The product pump (5) delive~s the desired flow rate which is from about 24 to 26 gallons/minute. There is a static mixer t7) employed downstream from the pump in order to completely intersperse the alkali throughout the slurry thus assuring a homogeneous reaction.
The various ingredient streams of this process may be fitted with a series of interlocking valves that are automatically operated ~n sequence and at predetermined intervals at (6). This permits automatic and continuous preparation of the proteinaceous adhesive.
The following Example will lllustrate the operation of this invention.
Example I
Water is pumped through a heat exchanger at 19.3 gallons/minute. Then 125 psi steam is used to heat the water to 160F. which takes 100 BTU/# of the water. Anti-foam is metered into the water stream at a rate of 120 ml~min. Soy protein adhesive solids are metered into a Tri-Blender~ at a rate of 40#/min. on a 90% dry basis as the heated water stream containing anti-foam passes through the Tri-Blender0. Ammonium hydroxide is added at a rate of .8 gal/mln. to adjust the pH
to between 9.2 and 9.6. The produc~ has a solids level of about 20%.
Having thus having described the above invention with reference to a specific example it is intended to include all reasonable equivalents and modiflcations within the scope of the present Claims.
~6;~3 Descrlptlon of the Drawing _ Flg. 1 is a flow dlagram of the process Or this invention.
Detailed Descrlption of the Preferred Embodim _ Re~errlng now to Flgure 1, ln accordance with the present invention, water is contlnuously heated (1) to pro~rid~
a temperature between 32F. and 212F., usually at a minimum -Or at least 130F. and preferably 160~F. The temperature must be sufficiently high to cook the adhesive solids, preferably protein. By "cooking" the solids one means ellmlnatlng small : gell particles. Nevertheless, excessive heatlng must be avolded : to prevent vaporization Or the water~ vapor lock in the product pump and interruptions in the flow pattern.
The water is then sub;ected to a venturl (2) rlow pattern as for example, through an inducer where an anti-foam agent is added at a rate of from about 0.01% to 5% by welght, based upon the dry weight of the adheslve solids. The antl-foam may be, for example, any of the commerclal llquld materlal.
:
- . :
Other additi~es which serve to modiry various characterlstics of the adhesive may be added in thls same fashion. The anti-roam and/or other addltives may or may not be necessary dependlng upon desired end use. Although the venturi flow addltlon is preferred, direct injection into the system wi-thout a venturl is acceptable.
The flow is sub~ected to vortex flow mixlng (3) as ror example, through a Tri-Blender~ at which point the adhesive solids are added to provide a solids level, in the water, of between about 5 and 25% by welght o~ water, pre~erably 20%
by weight 3 ( . 05 to .25 lbs/adhesive sollds/lb. H20). The adhe-sive sollds are preferably proteln, such as for example, hydrolyzed soy proteln isolate and casein. AIso~ starch may be utllized. The sollds should be ground into rree-rlowing form and o~ fairly consistent bulk density for most effectlve resul~s.
It is Or note that lf starch is utilixed, an additional heating means will be employed downstream from the point at whlch the starch is added. Thls is because the starch must be cooked at a temperature of at least 190F. but if the system is that hot prior to starch addltlon~ there ls a danger Or vapor lock in the vortex flow mixing the stage of the system.
By ~ortex flow mlxing it is meant that the protein and water are admixed with agitation and they come together in a vortex creating a more homogeneou~ mixture.
An alkali solution such as NH40H is dlrectly in~ected at (4) at a rate Or from about .01 to .04 lbs/lb H20. The precise rate ~ill vary depending upon the particu'ar alXali, its - burrering capacity and the partlcular characterlstlcs desired.
Provlded that a pH Or from about 8.5 to 10.0 is obtalned a sultable cutting actlon will occur. By cutting action it is meant that the lnsoluble protein wlll become solubl~. Typlcal , .
sP~4~
L63~, examples Or alkall are NH40H and NaOH. It is partlcularly preferred to use NH40H because there is little residual salt left in the coating.
The product pump (5) delive~s the desired flow rate which is from about 24 to 26 gallons/minute. There is a static mixer t7) employed downstream from the pump in order to completely intersperse the alkali throughout the slurry thus assuring a homogeneous reaction.
The various ingredient streams of this process may be fitted with a series of interlocking valves that are automatically operated ~n sequence and at predetermined intervals at (6). This permits automatic and continuous preparation of the proteinaceous adhesive.
The following Example will lllustrate the operation of this invention.
Example I
Water is pumped through a heat exchanger at 19.3 gallons/minute. Then 125 psi steam is used to heat the water to 160F. which takes 100 BTU/# of the water. Anti-foam is metered into the water stream at a rate of 120 ml~min. Soy protein adhesive solids are metered into a Tri-Blender~ at a rate of 40#/min. on a 90% dry basis as the heated water stream containing anti-foam passes through the Tri-Blender0. Ammonium hydroxide is added at a rate of .8 gal/mln. to adjust the pH
to between 9.2 and 9.6. The produc~ has a solids level of about 20%.
Having thus having described the above invention with reference to a specific example it is intended to include all reasonable equivalents and modiflcations within the scope of the present Claims.
Claims (9)
1. An improved method for preparing water soluble adhesives, comprising the steps of:
(a) heating a continuous flow of water to a pre-determined temperature relative to cooking adhesive solids to be added;
(b) subjecting said flow to a venturi flow pattern;
(c) adding through the venturi into the heated flowing water an anti-foaming agent at a rate of from .01%
to 5% by weight of adhesive solids;
(d) subjecting the flowing water to vortex flow mixing conditions;
(e) mixing adhesive solids to be rendered water soluble, said mixing accomplished at the point of the vortex flow mixing to provide a solids level in the water of between about 5 to 25% by weight and selectively providing additional heat, if necessary, to promote cooking of said added adhesive solids;
(f) injecting from about .01 to .04 lbs. of an aqueous alkali solution/lbs. of H2O; said alkali solution serving to adjust the pH of the solution to greater than 8.5;
(g) finally subjecting the flow to a static mixing action.
(a) heating a continuous flow of water to a pre-determined temperature relative to cooking adhesive solids to be added;
(b) subjecting said flow to a venturi flow pattern;
(c) adding through the venturi into the heated flowing water an anti-foaming agent at a rate of from .01%
to 5% by weight of adhesive solids;
(d) subjecting the flowing water to vortex flow mixing conditions;
(e) mixing adhesive solids to be rendered water soluble, said mixing accomplished at the point of the vortex flow mixing to provide a solids level in the water of between about 5 to 25% by weight and selectively providing additional heat, if necessary, to promote cooking of said added adhesive solids;
(f) injecting from about .01 to .04 lbs. of an aqueous alkali solution/lbs. of H2O; said alkali solution serving to adjust the pH of the solution to greater than 8.5;
(g) finally subjecting the flow to a static mixing action.
2. The method of Claim 1 wherein the flow of water is heated to a temperature of at least about 130°F.
3. The method of Claim 1 wherein the water is heated to a temperature of at least about 160°F.
4. The method of Claim 1 wherein the adhesive solids are proteinaceous solids.
5. The method of Claim 1 wherein the alkali is ammonium hydroxide.
6. The method of Claim 1 wherein the adhesive solids is mixed in the water to provide a solids level of about 20% by weight.
7. An improved method for preparing water soluble adhesives comprising the steps of:
(a) heating a continuous flow of water to a temperature of at least about 130°F.;
(b) subjecting said flow to a venturi flow pattern;
(c) adding through the venturi into the heated flowing water an anti-foaming agent at a rate of from .01 to 5% by weight of the adhesive solids;
(d) then subjecting the flowing water to vortex flow mixing conditions;
(e) mixing adhesive solids to be rendered water soluble at the point of the vortex flow mixing to provide a solids level of about 20% by weight and selectively providing additional heat, if necessary, to provide cooking of said added adhesive solids;
(f) injecting from about .01 to .04 lbs. of an aqueous alkali solution/lbs. of water, said alkali solution serving to adjust the pH of the solution to greater than 8.5;
(g) subjecting the flow to a static mixing action.
(a) heating a continuous flow of water to a temperature of at least about 130°F.;
(b) subjecting said flow to a venturi flow pattern;
(c) adding through the venturi into the heated flowing water an anti-foaming agent at a rate of from .01 to 5% by weight of the adhesive solids;
(d) then subjecting the flowing water to vortex flow mixing conditions;
(e) mixing adhesive solids to be rendered water soluble at the point of the vortex flow mixing to provide a solids level of about 20% by weight and selectively providing additional heat, if necessary, to provide cooking of said added adhesive solids;
(f) injecting from about .01 to .04 lbs. of an aqueous alkali solution/lbs. of water, said alkali solution serving to adjust the pH of the solution to greater than 8.5;
(g) subjecting the flow to a static mixing action.
8. The method of Claim 7 wherein the adhesive solids are selected from the group consisting of proteinaceous materials and starch.
9. The method of Claim 7, wherein the adhesive solids comprises a soy protein isolate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000309740A CA1116353A (en) | 1978-08-21 | 1978-08-21 | Method for the manufacture of water soluble adhesives |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000309740A CA1116353A (en) | 1978-08-21 | 1978-08-21 | Method for the manufacture of water soluble adhesives |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1116353A true CA1116353A (en) | 1982-01-19 |
Family
ID=4112176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000309740A Expired CA1116353A (en) | 1978-08-21 | 1978-08-21 | Method for the manufacture of water soluble adhesives |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1116353A (en) |
-
1978
- 1978-08-21 CA CA000309740A patent/CA1116353A/en not_active Expired
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| Date | Code | Title | Description |
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| MKEX | Expiry |