[특허]Method of water dispersing pregelatinized starch in making gypsum products

[미국특허] Method of water dispersing pregelatinized starch in making gypsum products 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B32B-013/00
출원번호	US-0413528 (2006-04-28)
등록번호	US-8262820 (2012-09-11)
발명자 / 주소	Yu, Qiang Song, Weixin David
출원인 / 주소	United States Gypsum Company
대리인 / 주소	Leydig Voit & Mayer, Ltd.
인용정보	피인용 횟수 : 5 인용 특허 : 45

초록 ▼

The invention provides in one embodiment a gypsum-containing slurry including stucco and an aqueous pre-dispersion of a pregelatinized starch. Also provided is a method of making gypsum wallboard by providing a pre-dispersion of the pregelatinized starch in water, and adding the pregelatinized starch pre-dispersion to the gypsum-containing slurry. The pregelatinized starch can have a particle size distribution within the following range: d (0.1)=about 20μ-35μ, d (0.5)=about 60μ-110μ, d (0.9)=about 100μ-220μ.

대표청구항 ▼

1. A method of making gypsum board, comprising: (a) providing pregelatinized starch having a particle size distribution within the following ranges: d(0.1)=from about 20μ to about 35μ,d(0.5)=from about 60μ to about 110μ,d(0.9)=from about 100μ to about 220μ;(b) dispersing the pregelatinized starch in water to form a pregelatinized starch dispersion;(c) introducing stucco to a mixer having nozzles that deliver water into the mixer and injecting the pregelatinized starch dispersion into the mixer adjacent the nozzles to fully disperse the starch in the resulting slurry;(d) disposing the slurry containing the dispersed starch between a first cover sheet and a second cover sheet to form a panel;(e) cutting the panel into a board of predetermined dimensions; and(f) drying the board. 2. The method of claim 1, wherein the pregelatinized starch is a pregelatinized corn starch. 3. The method of claim 2, wherein the pregelatinized corn starch is a ground pregelatinized corn starch. 4. The method of claim 1, further comprising introducing sodium trimetaphosphate into the mixer in an amount from about 0.12% to about 0.4% by weight based on the weight of the stucco, and introducing an about 45% by weight aqueous solution of a naphthalenesulfonate dispersant in an amount to deliver from about 0.5% to about 2.5% by weight naphthalenesulfonate dispersant based on the weight of the stucco. 5. The method of claim 1, in which the first cover sheet and the second cover sheet are made of paper. 6. The method of claim 1, in which the pregelatinized starch is a dispersion of about 10% by weight starch in water. 7. The method of claim 1, wherein the pregelatinized starch is present in an amount up to about 10% by weight based on the weight of the stucco. 8. The method of claim 1, wherein the pregelatinized starch has a particle size distribution of d (0.1)=about 25μ, d (0.5)=about 80μ, d (0.9)=about 150μ. 9. The method of claim 1, wherein the pregelatinized starch has a particle size distribution of d (0.1)=about 20μ, d (0.5)=about 60μ, d (0.9)=about 100μ. 10. The method of claim 1 in which the pregelatinized starch is dispersed in water at a temperature above about 55° F. (13° C.). 11. The method of claim 1, further comprising introducing water-soluble polyphosphate into the mixer in an amount from about 0.12% to about 0.4% by weight based on the weight of the stucco, and introducing naphthalenesulfonate dispersant in an amount to deliver from about 0.5% to about 2.5% by weight napthalenesulfonate dispersant based on the weight of the stucco. 12. A method of making gypsum board, comprising: (a) providing pregelatinized starch having a particle size distribution of d (0.1)=about 20μ, d (0.5)=about 60μ, d (0.9)=about 100μ;(b) dispersing the pregelatinized starch in water to form a pregelatinized starch dispersion;(c) introducing stucco to a mixer having nozzles that deliver water into the mixer, and injecting the pregelatinized starch dispersion into the mixer adjacent the nozzles to disperse the starch in the resulting slurry during a contact time with the stucco and water of less than one second;(d) disposing the slurry containing the dispersed starch between a first cover sheet and a second cover sheet to form a panel;(e) cutting the panel into a board of predetermined dimensions; and(f) drying the board. 13. The method of claim 12 in which the pregelatinized starch is dispersed in water at a temperature above about 55° F. (13° C.). 14. A method of making gypsum board, comprising: (a) providing ground pregelatinized starch having a particle size distribution within the following ranges: d(0.1)=from about 20μ to about 35μ,d(0.5)=from about 60μ to about 110μ,d(0.9)=from about 100μ to about 220μ;(b) dispersing the ground pregelatinized starch in water to form a ground pregelatinized starch dispersion;(c) introducing stucco to a mixer having nozzles that deliver water into the mixer and injecting the ground pregelatinized starch dispersion into the mixer adjacent the nozzles to disperse the starch in the resulting slurry;(d) disposing the slurry containing the dispersed starch between a first cover sheet and a second cover sheet to form a panel;(e) cutting the panel into a board of predetermined dimensions; and(f) drying the board.

이 특허에 인용된 특허 (45) 인용/피인용 타임라인 분석

Englert,Mark H.; Stevens,Richard B.; Sucech,Steven W.; Fults,Therese A.; Porter,Michael J.; Petersen,Bruce L.; Dombeck,Russell A., Acoustical panel comprising interlocking matrix of set gypsum and method for making same.
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Mason Walter R. (2817 Victoria Ave. Cincinnati OH 45208), Apparatus and system for producing foamed cementitious products.
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Johnson Steven Burdett ; Whittington Charles Allen ; Fullmer Lyle Dee, Apparatus for mixing calcined gypsum and its method of operation.
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Mills Peter S. (Burton-on-Trent GB2) Daly Ivor K. (Melbourne GB2), Apparatus for producing aerated cementitious compositions.
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Mills Peter S. (Burton-on-Trent GB2) Daly Ivor K. (Melbourne GB2), Apparatus for producing aerated cementitious compounds.
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Andersen,Per Just; Hodson,Simon K., Compositions for manufacturing fiber-reinforced, starch-bound articles having a foamed cellular matrix.
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Dahlman Donald P. (Lakewood CA), Demand responsive, continuous preparation of starch slurry for use in manufacturing gypsum products.
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Flickinger, Gregory; Zietlow, Philip K.; Stinson, James L.; Van Lengerich, Bernhard; Roy, Soumya, Gel products forming system and methods of preparation.
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Yu,Qiang; Sucech,Steven W; Groza,Brent E.; Mlinac,Raymond J.; Jones,Frederick T.; Henkels,Paul J., Gypsum-containing board and tile, and method for producing same.
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Veeramasuneni, Srinivas; Yu, Qiang; Frank, William A., Gypsum-containing composition having enhanced resistance to permanent deformation.
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Qiang Yu ; Steven W. Sucech ; Brent E. Groza ; Raymond J. Mlinac ; Frederick T. Jones ; Paul J. Henkels, Gypsum-containing product having increased resistance to permanent deformation and method and composition for producing it.
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Yu, Qiang; Sucech, Steven W.; Groza, Brent E.; Mlinac, Raymond J.; Jones, Frederick T.; Boehnert, Frederick M., Gypsum-containing product having increased resistance to permanent deformation and method and composition for producing it.
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Baig Mirza A. (Des Plaines IL), Gypsum/cellulosic fiber acoustical tile composition.
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Haasmaa, Kristiina; Paronen, Timo Petteri; Urtti, Arto Olavi; Peltonen, Soili; Heikkila , Maija Elina; Vuorenpaa, Jani, Hydrophobic polymer dispersion and process for the preparation thereof.
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Cao, Bangji; Song, Weixin D.; Chan, Cesar; Leckie, Scott, Gypsum board.
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[미국특허] Method of water dispersing pregelatinized starch in making gypsum products 원문보기