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    • 43. 发明申请
    • LOW DUST GYPSUM WALLBOARD
    • 低灰尘石膏壁板
    • WO2008063295A2
    • 2008-05-29
    • PCT/US2007/021573
    • 2007-10-09
    • UNITED STATES GYPSUM COMPANY
    • YU, QiangSONG, Weixin, David
    • C04B16/08C04B28/14B32B1/04
    • C04B28/14B32B13/02B32B13/04B32B13/08B32B13/14B32B17/02B32B29/00B32B2250/40B32B2307/306B32B2307/536B32B2307/546B32B2307/5825B32B2419/04B32B2607/00C04B2103/0075C04B2111/0062C04B2201/20Y02W30/97Y10T428/232C04B14/42C04B18/241C04B22/16C04B24/08C04B24/226C04B24/383C04B38/0054C04B38/0061C04B38/10C04B2103/408
    • This invention provides low dust low density gypsum wallboard products having high total core void volumes, corresponding to low densities in the range of about 10 to 30 pcf. The wallboards have a set gypsum core formed between two substantially parallel cover sheets, the set gypsum core preferably having a total void volume from about 80% to about 92%, and made from a slurry including stucco, pregelatinized starch, and a naphthalenesulfonate dispersant. The combination of the pregelatinized starch and the naphthalenesulfonate dispersant also provides a glue-like effect in binding the set gypsum crystals together. The wallboard formulation, along with small air bubble voids (and water voids) provides dust control during cutting, sawing, routing, snapping, nailing or screwing down, or drilling of the gypsum-containing products. This invention also provides a method of making the low dust low density gypsum products including the introduction of soap foam in an amount sufficient to form a total void volume, including air voids, preferably from about 80% to about 92% in the set gypsum core, corresponding to a set gypsum core density from about 10 pcf to about 30 pcf. The wallboards produced by the method generate significantly less dust during working.
    • 本发明提供具有高总核心空隙体积的低灰尘低密度石膏墙板产品,相当于约10至30pcf的低密度。 墙板具有在两个基本平行的覆盖片之间形成的凝固石膏芯,凝固石膏芯优选具有约80%至约92%的总空隙体积,并且由包含灰泥,预胶化淀粉和萘磺酸盐分散剂的浆料制成。 预凝胶化淀粉和萘磺酸盐分散剂的组合还提供了将凝固石膏晶体粘合在一起的胶状效果。 墙板配方以及小气泡空隙(和水空隙)在切割,锯切,布线,扣合,钉钉或拧紧或钻石膏产品期间提供了粉尘控制。 本发明还提供了一种制造低灰低密度石膏产品的方法,包括引入足够量的肥皂泡以在凝固石膏芯中形成包括气孔的总空隙体积,优选约80%至约92% ,对应于约10pcf至约30pcf的凝固石膏芯密度。 该方法生产的墙板在工作时产生的尘埃少得多。