CN101189126A - Method of improving dispersant efficacy in making gypsum products - Google Patents
Method of improving dispersant efficacy in making gypsum products Download PDFInfo
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- CN101189126A CN101189126A CNA2006800198181A CN200680019818A CN101189126A CN 101189126 A CN101189126 A CN 101189126A CN A2006800198181 A CNA2006800198181 A CN A2006800198181A CN 200680019818 A CN200680019818 A CN 200680019818A CN 101189126 A CN101189126 A CN 101189126A
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Abstract
The invention generally provides gypsum-containing slurries including stucco, trimetaphosphate salt, and naphthalenesulfonate dispersant, wherein the trimetaphosphate salt is present in an amount of at least about 0.12% by weight based on the weight of stucco. Other slurry additives can include accelerators, binders, starch, and paper fiber, glass fiber, and other known ingredients. The invention also comprises the gypsum-containing products made with such slurries, for example, gypsum wallboard, and a method of making gypsum wallboard.
Description
Technical field
The present invention relates to the method for water requirement that a kind of reduction is used for making the slurries of gypsum-containing products, and more particularly, relate to gypsum slurries that contains trimetaphosphate and naphthalenesulfonatedispersant dispersant and the product that makes by described gypsum slurries.The invention still further relates to a kind of by using trimetaphosphate and naphthalenesulfonatedispersant dispersant increase to comprise the method for dry strength of the gypsum-containing products of wallboard.
Background technology
Some characteristic of gypsum (calcium sulphate dihydrate) makes it be suitable for very much process industry and building products, such as gypsum wallboard.Gypsum is a kind of abundant and very cheap usually raw material of containing, and by dehydration and rehydrated process, can pour into a mould it, molded or make it be formed with the shape of usefulness in addition.The stock of making gypsum wallboard and other gypsum product is the calcium sulfate (CaSO that is commonly referred to half hydrated form of " plaster "
41/2 H
2O), it is the calcium sulfate (CaSO by thermal conversion two hydrated forms
42H
2O), obtain by removing its 1-1/2 hydrone.
Conventional gypsum-containing products (such as gypsum wallboard) has multiple benefit, and is low and be easy to processing such as cost.Used trimetaphosphate to assign to realize multiple improvement to the method for making gypsum-containing products as a kind of one-tenth of the slurries that are used for making described product.For instance, trimetaphosphate (such as sodium trimetaphosphate) comprises increase the compressive strength of the gypsum-containing products of gypsum wallboard.In the past, sodium trimetaphosphate and other trimetaphosphate that will not be higher than about 0.08 weight % in the weight content of plaster are used for described application.
Need in gypsum slurries, use a large amount of water so that guarantee the adequate liquidity of described slurries.Unfortunately, most water finally all must separate removal by heating, and this step seems that because of fuel used in the heating process has higher cost cost is too big.Heating steps is also quite time-consuming.In the past, do not recognize that trimetaphosphate can influence the water requirement of gypsum slurries.Yet inventor of the present invention finds, in the presence of specific dispersant, the content of trimetaphosphate is increased to still unknown at present degree makes and may realize suitable slurry fluidity, and the water yield that unexpectedly reduces.Certainly, reduced the use of fuel and the processing time relevant thereupon, catered to the need especially so become with the treatment step of removing water subsequently owing to increase trimetaphosphate content.Inventor of the present invention also finds, adds the dry strength that naphthalenesulfonatedispersant dispersant can increase plasterboard by using trimetaphosphate.
Summary of the invention
The present invention generally comprises a kind of slurries that comprise plaster, trimetaphosphate and naphthalenesulfonatedispersant dispersant.In the weight of plaster, sodium trimetaphosphate is to exist with the amount at least about 0.12 weight %.In a preferred embodiment, in the weight of dry plaster, trimetaphosphate is that the amount with about 0.12-0.4 weight % exists.In the weight of dry plaster, naphthalenesulfonatedispersant dispersant is that the amount with about 0.1 weight %-3.0 weight % exists.Other slurry additives can comprise starch, accelerator, adhesive, paper fiber or glass fibre and other known composition.The present invention also comprises the gypsum-containing products made from described slurries.
Preferred gypsum-containing products is a gypsum wallboard.In the present embodiment, the present invention structure comprises the gypsum wallboard that is formed at the set gypsum composition between the parallel cover plate of two cardinal principles, described set gypsum composition is to use the gypsum slurries that contains that is made of water, plaster, sodium trimetaphosphate and naphthalenesulfonatedispersant dispersant to make, wherein in the weight of plaster, described sodium trimetaphosphate is to exist with the amount at least about 0.12% weight.
In another embodiment, the invention provides the method that gypsum slurries is made gypsum wallboard that contains of a kind of, plaster moisture, sodium trimetaphosphate and naphthalenesulfonatedispersant dispersant by hybrid packet, wherein in the weight of plaster, described sodium trimetaphosphate is to exist with the amount at least about 0.12 weight %.The gypsum slurries that contains of gained is deposited on first paper cover plate, and second paper cover plate is put on the slurries that deposited to form gypsum wallboard.When contain gypsum slurries harden to be enough to cut after, gypsum wallboard is cut, and dry resulting gypsum wallboard.Also other composition commonly used slurries be can be used for, (suitably time) accelerator, adhesive, starch, paper fiber, glass fibre and other known composition comprised.Usually also add soap lather to reduce the density of final gypsum wallboard product.
Description of drawings
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The specific embodiment
According to one embodiment of present invention, provide by contain plaster, sodium trimetaphosphate and naphthalenesulfonatedispersant dispersant contain that gypsum slurries makes contain the gypsum finished product.Spendable other composition comprises starch, paper fiber, glass fibre and accelerator in the described slurries.Usually also soap lather is added containing in the gypsum slurries of new allotment, to reduce the density of final gypsum-containing products (for example, gypsum wallboard).
Minimum is at least about 0.12 weight % will the unexpectedly obvious flowability that increases described gypsum slurries to the combination of the naphthalenesulfonatedispersant dispersant (both is the weight in employed dry plaster in the gypsum slurries) of about 3.0 weight % to trimetaphosphate and the about 0.1 weight % of 0.4 weight %.This will reduce preparation substantially and have the required water yield of gypsum slurries that enough flowabilities are ready to use in manufacturing gypsum-containing products (such as gypsum wallboard).Believe the dispersant activity that will strengthen naphthalenesulfonatedispersant dispersant for the content (with the form of sodium trimetaphosphate) at least about 2 times trimetaphosphate of content in the standard composite.It should be noted that in all embodiment of the present invention, must use the combination of naphthalenesulfonatedispersant dispersant and water-soluble metaphosphate or Quadrafos (and preferred water dissolubility trimetaphosphate).
The naphthalenesulfonatedispersant dispersant that is used for the present invention comprises poly-naphthalene sulfonic acids and its salt (poly naphthalene sulfonate) and derivative, and it is the condensation product of naphthalene sulfonic acids and formaldehyde.Desirable especially poly naphthalene sulfonate comprises sodium naphthalene sulfonate and naphthalene sulfonic acids calcium.The mean molecule quantity of naphthalene sulfonate can be in about scope of 3,000 to 20,000, but described molecular weight is preferably about 8,000 to 10,000.The dispersant of higher molecular weight has higher viscosity, and produces higher water requirement in allocation process.Useful naphthalene sulfonate comprises the Chemicals available from GEO Specialty, Cleveland, the DILOFLO of Ohio; Available from Hampshire Chemical Corp., Lexington, the DAXAD of Massachusetts; With available from GEO SpecialtyChemicals, Lafayette, the LOMAR D of Indiana.Naphthalene sulfonate preferably uses with the form of the aqueous solution of (for example) solid content in the scope of 35-55 weight %.Most preferably use the naphthalene sulfonate of the aqueous solution form of (for example) solid content in the scope of about 40-45 weight %.Perhaps, in the time of suitably, naphthalene sulfonate can do solid or powder type uses.
The poly naphthalene sulfonate that can be used among the present invention has universal architecture (I):
N＞2 wherein, and wherein M is sodium, potassium, calcium etc.
In the weight of employed dry plaster in the gypsum composite composite, the naphthalenesulfonatedispersant dispersant that is preferably the aqueous solution form of about 45 weight % must be to use to the amount in about 2.5 weight % scopes at about 0.5 weight %.In the weight of dry plaster, the more preferably scope of naphthalenesulfonatedispersant dispersant is about 0.5 weight % to about 1.5 weight %, and in the weight of dry plaster, most preferred scope is that about 0.7 weight % is to about 1.5 weight %.
Change kind of a mode and say, in the weight of employed dry plaster in the gypsum composite composite, naphthalenesulfonatedispersant dispersant must be to use to the amount in about 3.0 weight % scopes at about 0.1 weight % with dry weight basis.In the weight of dry plaster, the more preferably scope of naphthalenesulfonatedispersant dispersant (in dried solid) is about 0.25 weight % to about 2.0 weight %, and in the weight of dry plaster, most preferred scope (in dried solid) be that about 0.3 weight % arrives about 0.7 weight %.
Any suitable water-soluble metaphosphate or Quadrafos all can be used among the present invention.The preferred trimetaphosphate that uses comprises double salt, just has two cationic trimetaphosphates.Useful especially trimetaphosphate comprises sodium trimetaphosphate, three potassium metaphosphates, three calcium metaphosphates, sodium calcium trimetaphosphate, three lithium metaphosphates, three ammonium metaphosphates etc., or its combination.Preferred trimetaphosphate is a sodium trimetaphosphate.The preferred trimetaphosphate that be aqueous solution form of (for example) solid content in the scope of about 10-15 weight % that use.Also can use other ring-type or acyclic Quadrafos, described in No. the 6th, 409,825, the United States Patent (USP) of giving people such as Yu that is incorporated herein with way of reference.
Sodium trimetaphosphate is the additives known that contains in the gypsum compositions, but in the weight of employed dry plaster in the gypsum slurries, it is normally to use to the amount in about 0.08 weight % scope at about 0.05 weight %.In an embodiment of the present invention, in the weight of employed dry plaster in the gypsum composite composite, sodium trimetaphosphate (or other water-soluble metaphosphate or Quadrafos) must be to exist to the amount in about 0.4 weight % scope at about 0.12 weight %.In the weight of employed dry plaster in the gypsum composite composite, the preferable range of sodium trimetaphosphate (or other water-soluble metaphosphate or Quadrafos) is that about 0.12 weight % is to about 0.3 weight %.
The plaster that has two kinds of forms, α and β.This two classes plaster is to be made by different calcining manners.In the present invention, can use the plaster of β or alpha form.
In contain in gypsum slurries prepared, can use starch (especially comprising pre-gelatinize starch) according to the present invention.Preferred pre-gelatinize starch is pre-gelatinize cornstarch, for example, and available from Bunge Milling, St.Louis, the pre-gelatinize corn flour of Missouri, it has following canonical analysis: moisture 7.5%, protein 8.0%, oil 0.5%, crude fibre 0.5%, ash content 0.3%; Green strength is 0.48psi; And apparent density is 35.0 lb/ft
3To contain the weight of employed dry plaster in the gypsum slurries, pre-gelatinize cornstarch can use up to about the amount of 10 weight %.
Other useful starch comprises the starch through sour modification, such as corn flour through sour modification, and as available from BungeMilling, St.Louis, the HI-BOND of Missouri.This starch has following canonical analysis: moisture 10.0%, oil 1.4%, DDGS 17.0%, alkalescence flowability 98.0%, apparent density 30 lb/ff
3And produce 20% slurries of 4.3 pH value.Another kind of useful starch is pre-gelatinize wheaten starch, such as available from ADM/Ogilvie, and Montreal, Quebec, the ECOSOL-45 of Canada, it has the DDGS of maximum 25%.
Can will speed up agent and be used for the gypsum compositions that contains of the present invention, described in No. the 6th, 409,825, the United States Patent (USP) of giving people such as Yu that is incorporated herein with way of reference.A kind of desirable heat resistant accelerator (HRA) can be made by the building gypsum plaster (landplaster) (calcium sulphate dihydrate) of dry grinding.Can use on a small quantity and make this HRA such as additives such as sugar, dextrose, boric acid and starch (about 5 weight % usually).Current preferred sugar or dextrose.Of No. the 3rd, 573,947, the United States Patent (USP) that is incorporated herein with way of reference, another kind of useful accelerator is for " accelerator of Weather-stable (climate stabilized accelerator) " or " weather can be stablized accelerator " (CSA).
Following example will further specify the present invention.It should be interpreted as limiting the scope of the invention by any way.
Example 1
Gypsum slurries composite sample
The gypsum slurries composite is showed in the following table 1.All values in the table 1 all is based on the weight of dry plaster and represents with percentage by weight.Value in the bracket is for being the dry weight (lb/MSF) of unit with the pound.
Table 1
| Component | Composite A | Composite B |
| Plaster (lb/MSF) | (732) | (704) |
| Sodium trimetaphosphate | 0.20(1.50) | 0.30(2.14) |
| Dispersant (naphthalene sulfonate) | 0.18(1.35) | 0.58 1(4.05) |
| Pre-gelatinize starch | 2.7(20) | 6.4(45) |
| Cardboard starch | 0.41(3.0) | 0 |
| Heat resistant accelerator (HRA) | (15) | (15) |
| Glass fibre | 0.27(2.0) | 0.28(2.0) |
| The paper fiber | 0 | 0.99(7.0) |
| Soap * | 0.03(0.192) | 0.03(0.192) |
| Total Water (lb) | 805 | 852 |
| Water/plaster ratio | 1.1 | 1.2 |
*Be used for producing in advance foam.
11.28 45% the aqueous solution of weight %
Example 2
The manufacturing of wallboard
The gypsum wallboard sample is the 6th, 632, No. 550 manufacturings according to people such as the people's such as Yu that are incorporated herein by reference No. the 6th, 342,284, United States Patent (USP) and Yu.As described in the example 5 of these patents, manufacture method comprises independent generation foam and described foam introducing is had in the slurries of other composition.
The result of the test of the composite A of use-case 1 and prepared gypsum wallboard of B and contrast all is showed in the following table 2.In this example and other example hereinafter, nail pulling resistance, core hardness and anti-reflecting bending strength test all are to carry out according to ASTMC-473.In addition, it should be noted that typical gypsum wallboard be about 1/2 inch thick, and have weight between per 1000 square feet of materials about 1600 to 1800 pounds (or lb/MSF).(" MSF " is 1,000 square feet standardized abbreviations in affiliated field; It is the area tolerance to box, wavy medium and wallboard.)
Table 2
| Laboratory results | The contrast cardboard | Composite A cardboard | Composite B cardboard |
| Cardboard weight (lb/MSF) | 1587 | 1066 | 1042 |
| Nail pulling resistance (lb) | 81.7 | 50.2 | 72.8 |
| Core hardness (lb) | 16.3 | 5.2 | 11.6 |
| Moist bonding load (lb) | 17.3 | 20.3 | 15.1 |
| Moist bond damage (%) | 0.6 | 5 | 11.1 |
| Bending strength faces up (MD) (lb) | 47 | 47.2 | 52.6 |
| Bending strength faces down (MD) (lb) | 51.5 | 66.7 | 78.8 |
| Bending strength faces up (XMD) (lb) | 150 | 135.9 | 173.1 |
| Bending strength faces down (XMD) (lb) | 144.4 | 125.5 | 165.4 |
MD: together vertical
XMD: laterally
Described in table 2, compare according to cardboard, use composite A and the prepared gypsum wallboard weight of B slurries obviously to alleviate.Referring again to table 1, composite A cardboard and composite B cardboard differ very big.Water/plaster of composite A and composite B (w/s) is than similar.Also use the naphthalenesulfonatedispersant dispersant of obvious high level among the composite B.In addition, use the more pre-gelatinize starch of essence of about 6 weight % in composite B, this increases above 100% than composite A, follows tangible intensity to increase simultaneously.Even like this, the water requirement that produces required flowability is still lower for composite B slurries, and A compares with composite, and difference is less than 10%.The low water demand of two kinds of composites is owing to the synergy of naphthalenesulfonatedispersant dispersant in the gypsum slurries and sodium trimetaphosphate combination, and this makes even exists essence more still can increase the flowability of gypsum slurries under the situation of the pre-gelatinize starch of high-load.
As described in Table 2, compare and use the prepared wallboard of composite A slurries, use the intensity that the prepared wallboard of composite B slurries has to be increased in fact.By incorporating the pre-gelatinize starch with the recruitment of the naphthalenesulfonatedispersant dispersant of recruitment and sodium trimetaphosphate combination into, the nail pulling resistance of composite B cardboard is compared composite A cardboard and is improved 45%.Compare with composite A cardboard, the essence of also observing bending strength in composite B cardboard increases.
Example 3
The loss of weight experiment of 1/2 inch gypsum wallboard
Other gypsum wallboard example (cardboard C, D and E) that comprises slurries composite and result of the test all is showed in the following table 3.Slurries composite in the table 3 comprises the key component in the described slurries.Value in the bracket is based on the weight of dry plaster and represents with percentage by weight.
Table 3
| Experiment deployment thing component/parameter | The contrast cardboard | Composite C cardboard | Composite D cardboard | Composite E cardboard |
| Dry plaster (lb/MSF) | 1300 | 1281 | 1196 | 1070 |
| Accelerator (lb/MSF) | 9.2 | 9.2 | 9.2 | 9.2 |
| DILOFLO 1(lb/MSF) | 4.1(0.32％) | 8.1(0.63％) | 8.1(0.68％) | 8.1(0.76％) |
| Conventional starch (lb/MSF) | 5.6(0.43％) | 0 | 0 | 0 |
| Pre-gelatinize cornstarch (lb/MSF) | 0 | 10(0.78％) | 10(0.84％) | 10(0.93％) |
| Sodium trimetaphosphate (lb/MSF) | 0.7(0.05％) | 1.6(0.12％) | 1.6(0.13％) | 1.6(0.15％) |
| Total water/plaster is than (w/s) | 0.82 | 0.82 | 0.82 | 0.84 |
| Experiment deployment thing result of the test | ||||
| Dried cardboard weight (lb/MSF) | 1611 | 1570 | 1451 | 1320 |
| Nail pulling resistance (lb) | 77.3 + | 85.5 | 77.2 | 65.2 |
+ASTM standard: 77 lb
1DILOFLO is 45% the naphthalene sulfonate aqueous solution
Described in table 3, cardboard C, D are that (starch and dispersant are in percentage, and about twice increases by the quality entity increase of comparing starch, DILOFLO dispersant and sodium trimetaphosphate with the contrast cardboard with E; And trimetaphosphate increases by 2 to 3 times) and while w/s makes than the constant slurries of maintenance.Yet, be not subjected to obviously influence and cardboard weight obviously alleviates as the intensity that measures by the nail pulling resistance.Therefore, in this example of embodiments of the invention, novel composite (such as, cardboard D) starch that increases can be allocated in the flowed slurries also easy to use when keeping suitable intensity.
Example 4
Wet gypsum cubic block strength test
Wet cubic block strength test is to pass through to use in the laboratory available from United States Gypsum Corp., Chicago, and the Southard CKS cardboard plaster of Illinois and running water carry out to measure its Wet Compression intensity.Use following laboratory test program.
Under about 70 , plaster (1000g), CSA (2g) and running water (1200cc) are used for the wet gypsum cubic block that each is poured into a mould.At first, in polybag with pre-gelatinize cornstarch (20g, in stucco wt 2.0%) and CSA (2g is in stucco wt 0.2%) mix with the thorough dry mixing of plaster, make it subsequently and contain naphthalenesulfonatedispersant dispersant and mix with the polymer solution in water of sodium trimetaphosphate.Employed dispersant is DILOFLO dispersant (1.0-2.0% is described in table 4).Also use the sodium trimetaphosphate of variable quantity as shown in table 4.
At first, the laboratory with Warning blending machine in the combination dry ingredients and the aqueous solution, the mixture that is produced was soaked 10 seconds, and subsequently with the described mixture of mixed on low speed 10 seconds so that make slurries.The slurries that form thus are poured into three 2 " * 2 " * 2 " cube mold in.Subsequently the cubic block of being poured into a mould is taken out from mould, weigh and be sealed in the polybag and lose, carry out the compressive strength test subsequently to prevent that water from dividing.The compressive strength of wet cubic block is to use the ATS machine to measure, and is recorded as the mean value of pounds per square inch (p.p.s.i) (psi).The gained result is as follows:
Table 4
| The test sample numbering | Sodium trimetaphosphate, gram (in the weight % of dry plaster) | DILOFLO 1(in the weight % of dry plaster) | Wet cubic block weight (2 " * 2 " * 2 "), g | Wet cubic block compressive strength, psi |
| 1 | 0 | 1.5 | 183.57 | 321 |
| 2 | 0.5(0.05) | 1.5 | 183.11 | 357 |
| 3 | 1(0.1) | 1.5 | 183.19 | 360 |
| 4 | 2(0.2) | 1.5 | 183.51 | 361 |
| 5 | 4(0.4) | 1.5 | 183.65 | 381 |
| 6 | 10(1.0) | 1.5 | 183.47 | 369 |
| 7 | 0 | 1.0 | 184.02 | 345 |
| 8 | 0.5(0.05) | 1.0 | 183.66 | 349 |
| 9 | 1(0.1) | 1.0 | 183.93 | 356 |
| 10 | 2(0.2) | 1.0 | 182.67 | 366 |
| 11 | 4(0.4) | 1.0 | 183.53 | 365 |
| 12 | 10(1.0) | 1.0 | 183.48 | 341 |
| 13 | 0 | 2.0 | 183.33 | 345 |
| 14 | 0.5?(0.05) | 2.0 | 184.06 | 356 |
| 15 | 1(0.1) | 2.0 | 184.3 | 363 |
| 16 | 2(0.2) | 2.0 | 184.02 | 363 |
| 17 | 4(0.4) | 2.0 | 183.5 | 368 |
| 18 | 10(1.0) | 2.0 | 182.68 | 339 |
1DILOFLO is 45% the naphthalene sulfonate aqueous solution
Described in table 4, of the present invention sample 4-5, the 10-11 of sodium trimetaphosphate content in about 0.12-0.4% scope compares sodium trimetaphosphate content and has good wet cubic block compressive strength usually at this extraneous sample with 17.
Example 5
1/2 inch light weight gypsum wallboard plant produced experiment
Carry out other experiment (experiment cardboard 1 and 2), comprise that slurries composite and result of the test all are showed in the following table 5.Slurries composite in the table 5 comprises the key component in the described slurries.Value in the bracket is based on the weight of dry plaster and represents with percentage by weight.
Table 5
| Experiment deployment thing component/parameter | Contrast cardboard 1 | Factory's composite experiment cardboard 1 | Contrast cardboard 2 | Factory's composite experiment cardboard 2 |
| Dry plaster (lb/MSF) | 1308 | 1160 | 1212 | 1120 |
| DILOFLO 1(lb/MSF) | 5.98(0.457％) | 7.98(0.688％) | 7.18(0.592％) | 8.99(0.803％) |
| Conventional starch (lb/MSF) | 5.0(0.38％) | 0 | 4.6(0.38％) | 0 |
| Pre-gelatinize cornstarch (lb/MSF) | 2.0(0.15％) | 10(0.86％) | 2.5(0.21％) | 9.0(0.80％) |
| Sodium trimetaphosphate (lb/MSF) | 0.7(0.05％) | 2.0(0.17％) | 0.6(0.05％) | 1.6(0.14％) |
| Total water/plaster is than (w/s) | 0.79 | 0.77 | 0.86 | 0.84 |
| Experiment deployment thing result of the test | ||||
| Dried cardboard weight (lb/MSF) | 1619 | 1456 | 1553 | 1443 |
| Nail pulling resistance (lb) | 81.5 + | 82.4 | 80.7 | 80.4 |
| Average bending strength (MD) (lb) | 41.7 | 43.7 | 44.8 | 46.9 |
| Average bending strength (XMD) (lb) | 134.1 | 135.5 | 146 | 137.2 |
| Average moist bonding 2Load (lb) | 19.2 | 17.7 | 20.9 | 19.1 |
| Moist bonding 2，3Destroy (%) | 1.6 | 0.1 | 0.5 | 0 |
+ASTM standard: 77 lb
MD: vertically
XMD: laterally
1DILOFLO is 45% the naphthalene sulfonate aqueous solution
290 /90% relative humidity
3Should be appreciated that, under these experimental conditions, destroy percentage＜50%th, acceptable.
Described in table 5, experiment cardboard 1 and 2 all is that the w/s ratio keeps constant slurries to make by comparing according to the quality entity increase of cardboard starch, DILOFLO dispersant and sodium trimetaphosphate simultaneously.Yet as still being kept by nail pulling resistance and the measured intensity of beam test or be improved, and cardboard weight obviously alleviates.Therefore, in this example of embodiments of the invention, novel composite (such as, experiment cardboard 1 and 2) trimetaphosphate and the starch that increase can be allocated in flowed slurries easy to use, also keep suitable intensity simultaneously.
Example 6
1/2 inch ultralight rock gypsum wallboard plant produced experiment
The same with example 2, use composite B (example 1) to carry out other experiment (experiment cardboard 3 and 4), but pre-gelatinize cornstarch is water with 10% prepared at concentrations (wet starch preparation) and uses HYONIC PFM soap (available from GEO Specialty Chemicals, Lafayette, admixture Indiana).For instance, experiment cardboard 3 is the admixture manufacturings that are used in the HYONIC PFM 10/HYONIC PFM 33 in 65-70 weight %/35-30 weight % scope.For instance, experiment cardboard 4 is the admixture manufacturings with the HYONIC PFM 10/HYONIC PFM 33 of 70/30wt./wt..Experimental result is showed in the following table 6.
Table 6
| Laboratory results | Experiment cardboard 3 (composite B adds HYONIC soap admixture 65/35) (n=12) | Experiment cardboard 4 (composite B adds HYONIC soap admixture 70/30) (n=34) * |
| Cardboard weight (lb/MSF) | 1106 | 1013 |
| The nail pulling resistance a(lb) | 85.5 | 80.3 |
| Core hardness b(lb) | 12.4 | ＞15 |
| Average bending strength c(MD) (lb) | 55.6 | 60.3 1 |
| Average bending strength d(XMD) (lb) | 140.1 | 142.3 1 |
*Except institute's mark.
1n＝4
MD: vertically
XMD: laterally
aASTM standard: 77 lb
bASTM standard: 11 lb
cASTM standard: 36 lb
dASTM standard: 107 lb
Described in table 6, as all being higher than the ASTM standard by nail pulling and the measured strength characteristic of core hardness.Bending strength also is higher than the ASTM standard through measuring.In addition, in this example of embodiments of the invention, novel composite (such as, experiment cardboard 3 and 4) trimetaphosphate and the starch that increase can be allocated in flowed slurries easy to use, also keep suitable intensity simultaneously.
Unless explain in addition in this article or clearly do opposite explanation by literal, otherwise in describing context of the present invention (especially in the context at following claims), the use of term " " and " described " and similar statement should be interpreted as containing single and a plurality of reference substances.Unless otherwise mentioned, otherwise just hoping for the narration of the scope of this paper intermediate value will be as each method for simplifying of value separately of mentioning independently in described scope, and each independent value all will be incorporated in this specification, just as in this article it being narrated independently.Unless explain in addition in this article or clearly do in addition to illustrate on the contrary, otherwise all methods as herein described can be carried out by any order by literal.Unless state in addition, otherwise the use of any example that this paper provided and all examples or exemplary term (for example, " such as ") all just hopes and will be used for the present invention is described better, and do not form restriction to scope of the present invention.Should not be that any non-element of applying for of indication is essential by putting into practice the present invention with the terminological interpretation in this specification.
This paper describes the preferred embodiments of the present invention, comprises that known being used to of inventor carry out optimal mode of the present invention.Should be appreciated that described embodiment just provides for the purpose of exemplary illustration, and should not regard it as limitation of the scope of the invention.
Claims (18)
1. one kind contains gypsum slurries, and it comprises: water, plaster, sodium trimetaphosphate and naphthalenesulfonatedispersant dispersant, wherein in the weight of plaster, described sodium trimetaphosphate is to exist with the amount at least about 0.12 weight %.
2. the gypsum slurries that contains according to claim 1, wherein in the weight of plaster, described naphthalenesulfonatedispersant dispersant is to exist to the amount of about 3.0 weight % with about 0.1 weight %.
3. the gypsum slurries that contains according to claim 1, wherein in the weight of plaster, described naphthalenesulfonatedispersant dispersant is to exist to the amount of about 2.0 weight % with about 0.25 weight %.
4. the gypsum slurries that contains according to claim 1, wherein in the weight of plaster, described naphthalenesulfonatedispersant dispersant is to exist to the amount of about 0.7 weight % with about 0.3 weight %.
5. the gypsum slurries that contains according to claim 1, wherein said naphthalenesulfonatedispersant dispersant is to contain the form of 40 weight % to the aqueous solution of the naphthalene sulfonate of about 45 weight % of having an appointment, and in the weight of plaster, the described aqueous solution is to exist to the amount of about 2.5 weight % with about 0.5 weight %.
6. the gypsum slurries that contains according to claim 1, wherein said naphthalenesulfonatedispersant dispersant is to contain the form of 40 weight % to the aqueous solution of the naphthalene sulfonate of about 45 weight % of having an appointment, and in the weight of plaster, the described aqueous solution is to exist to the amount of about 1.5 weight % with about 0.5 weight %.
7. the gypsum slurries that contains according to claim 1, wherein said naphthalenesulfonatedispersant dispersant is to contain the form of 40 weight % to the aqueous solution of the naphthalene sulfonate of about 45 weight % of having an appointment, and in the weight of plaster, the described aqueous solution is to exist to the amount of about 1.5 weight % with about 0.7 weight %.
8. gypsum wallboard, it comprises:
Set gypsum composition, it is formed between the parallel cover plate of two cardinal principles, and described set gypsum composition is to use the gypsum slurries that contains that comprises following material to make:
Water, plaster, sodium trimetaphosphate and naphthalenesulfonatedispersant dispersant, wherein in the weight of plaster, described sodium trimetaphosphate is to exist with the amount at least about 0.12 weight %.
9. gypsum wallboard according to claim 8, wherein in the weight of plaster, described naphthalenesulfonatedispersant dispersant is to exist to the amount of about 3.0 weight % with about 0.1 weight %.
10. gypsum wallboard according to claim 8, wherein in the weight of plaster, described naphthalenesulfonatedispersant dispersant is to exist to the amount of about 2.0 weight % with about 0.25 weight %.
11. gypsum wallboard according to claim 8, wherein in the weight of plaster, described naphthalenesulfonatedispersant dispersant is to exist to the amount of about 0.7 weight % with about 0.3 weight %.
12. gypsum wallboard according to claim 8, wherein said naphthalenesulfonatedispersant dispersant is to contain the form of 40 weight % to the aqueous solution of the naphthalene sulfonate of about 45 weight % of having an appointment, and in the weight of plaster, the described aqueous solution is to exist to the amount of about 2.5 weight % with about 0.5 weight %.
13. gypsum wallboard according to claim 8, wherein said naphthalenesulfonatedispersant dispersant is to contain the form of 40 weight % to the aqueous solution of the naphthalene sulfonate of about 45 weight % of having an appointment, and in the weight of plaster, the described aqueous solution is to exist to the amount of about 1.5 weight % with about 0.5 weight %.
14. gypsum wallboard according to claim 8, wherein said naphthalenesulfonatedispersant dispersant is to contain the form of 40 weight % to the aqueous solution of the naphthalene sulfonate of about 45 weight % of having an appointment, and in the weight of plaster, the described aqueous solution is to exist to the amount of about 1.5 weight % with about 0.7 weight %.
15. a method of making gypsum wallboard, it comprises following steps:
(a) mix the gypsum slurries that contains that comprises following material:
Water, plaster, sodium trimetaphosphate and naphthalenesulfonatedispersant dispersant,
Wherein in the weight of plaster, described sodium trimetaphosphate is to exist with the amount at least about 0.12 weight %;
(b) the described gypsum slurries that contains is deposited on first cover plate;
(c) second cover plate is placed on the described slurries that deposited to form gypsum wallboard;
(d) described contain gypsum slurries harden to be enough to cut after, described gypsum wallboard is cut; With
(e) dry described gypsum wallboard.
16. method according to claim 15, wherein said first cover plate and described second cover plate all are made of paper.
17. method according to claim 15, wherein in the weight of plaster, described sodium trimetaphosphate is to exist to the amount of about 0.4 weight % with about 0.12 weight %, and in the weight of plaster, described naphthalenesulfonatedispersant dispersant is to exist to the amount of about 3.0 weight % with about 0.1 weight %.
18. method according to claim 15, wherein in the weight of plaster, described sodium trimetaphosphate is to exist to the amount of about 0.4 weight % with about 0.12 weight %, and described naphthalenesulfonatedispersant dispersant is to contain the form of 40 weight % to the aqueous solution of the naphthalene sulfonate of about 45 weight % of having an appointment, and in the weight of plaster, the described aqueous solution is to exist to the amount of about 2.5 weight % with about 0.5 weight %.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US68883905P | 2005-06-09 | 2005-06-09 | |
| US60/688,839 | 2005-06-09 | ||
| US11/445,906 | 2006-06-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101189126A true CN101189126A (en) | 2008-05-28 |
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ID=38048157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800198181A Pending CN101189126A (en) | 2005-06-09 | 2006-06-07 | Method of improving dispersant efficacy in making gypsum products |
Country Status (6)
| Country | Link |
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| CN (1) | CN101189126A (en) |
| AR (4) | AR054389A1 (en) |
| MY (1) | MY148453A (en) |
| TW (3) | TWI444349B (en) |
| UA (2) | UA91856C2 (en) |
| ZA (2) | ZA200709397B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107921736A (en) * | 2015-06-24 | 2018-04-17 | 美国石膏公司 | Composite gypsum board and its correlation technique |
| US11225046B2 (en) | 2016-09-08 | 2022-01-18 | United States Gypsum Company | Gypsum board with perforated cover sheet and system and method for manufacturing same |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9840066B2 (en) * | 2005-06-09 | 2017-12-12 | United States Gypsum Company | Light weight gypsum board |
| US9540810B2 (en) | 2012-10-23 | 2017-01-10 | United States Gypsum Company | Pregelatinized starch with mid-range viscosity, and product, slurry and methods related thereto |
| US10399899B2 (en) | 2012-10-23 | 2019-09-03 | United States Gypsum Company | Pregelatinized starch with mid-range viscosity, and product, slurry and methods related thereto |
| US9828441B2 (en) | 2012-10-23 | 2017-11-28 | United States Gypsum Company | Method of preparing pregelatinized, partially hydrolyzed starch and related methods and products |
| UA109836C2 (en) * | 2012-12-03 | 2015-10-12 | SUSTAINABLE Gypsum product and method of its manufacture | |
| CA2925619C (en) * | 2013-10-02 | 2022-07-19 | United States Gypsum Company | Method of preparing pregelatinized, partially hydrolyzed starch and related methods and products |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ID21641A (en) * | 1997-08-21 | 1999-07-08 | United States Gypsum Co | PRODUCTS CONTAINING GYPSUM BY IMPROVING RESISTANCE TO FIXED DEFORMATION AND METHODS AND COMPOSITION TO PRODUCE IT |
| CA2338941C (en) * | 1998-07-30 | 2009-12-22 | United States Gypsum Company | Gypsum-containing product having increased resistance to permanent deformation and method and composition for producing it |
| US6387172B1 (en) * | 2000-04-25 | 2002-05-14 | United States Gypsum Company | Gypsum compositions and related methods |
-
2006
- 2006-06-07 CN CNA2006800198181A patent/CN101189126A/en active Pending
- 2006-06-07 UA UAA200713725A patent/UA91856C2/en unknown
- 2006-06-08 TW TW95120407A patent/TWI444349B/en not_active IP Right Cessation
- 2006-06-08 MY MYPI20062680 patent/MY148453A/en unknown
- 2006-06-08 UA UAA200713728A patent/UA95074C2/en unknown
- 2006-06-08 TW TW102103907A patent/TWI496757B/en active
- 2006-06-08 TW TW095120408A patent/TW200708494A/en unknown
- 2006-06-09 AR ARP060102433 patent/AR054389A1/en active IP Right Grant
- 2006-06-09 AR ARP060102432 patent/AR053623A1/en unknown
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2007
- 2007-10-31 ZA ZA200709397A patent/ZA200709397B/en unknown
- 2007-10-31 ZA ZA200709399A patent/ZA200709399B/en unknown
-
2014
- 2014-03-26 AR ARP140101381A patent/AR095906A2/en unknown
- 2014-03-26 AR ARP140101382A patent/AR095907A2/en not_active Application Discontinuation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107921736A (en) * | 2015-06-24 | 2018-04-17 | 美国石膏公司 | Composite gypsum board and its correlation technique |
| US10421251B2 (en) | 2015-06-24 | 2019-09-24 | United States Gypsum Company | Composite gypsum board and methods related thereto |
| US10421250B2 (en) | 2015-06-24 | 2019-09-24 | United States Gypsum Company | Composite gypsum board and methods related thereto |
| US11225046B2 (en) | 2016-09-08 | 2022-01-18 | United States Gypsum Company | Gypsum board with perforated cover sheet and system and method for manufacturing same |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI496757B (en) | 2015-08-21 |
| AR053623A1 (en) | 2007-05-09 |
| UA91856C2 (en) | 2010-09-10 |
| ZA200709399B (en) | 2008-10-29 |
| AR095907A2 (en) | 2015-11-25 |
| TWI444349B (en) | 2014-07-11 |
| TW201332933A (en) | 2013-08-16 |
| UA95074C2 (en) | 2011-07-11 |
| AR095906A2 (en) | 2015-11-25 |
| ZA200709397B (en) | 2008-10-29 |
| AR054389A1 (en) | 2007-06-20 |
| TW200708494A (en) | 2007-03-01 |
| TW200710059A (en) | 2007-03-16 |
| MY148453A (en) | 2013-04-30 |
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