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    • 8. 发明授权
    • Method for cleaning and minimizing the buildup of set gypsum
    • 清洁和最小化集团石膏堆积的方法
    • US5932019A
    • 1999-08-03
    • US885070
    • 1997-06-30
    • Therese A. EspinozaRichard B. StevensCharles J. MillerFriedrich Failmezger
    • Therese A. EspinozaRichard B. StevensCharles J. MillerFriedrich Failmezger
    • B08B3/08B08B17/00C04B41/53C23G1/02B08B3/12
    • C23G1/02B08B17/00B08B3/08C04B41/5315
    • The present invention relates to a method for minimizing the buildup of set gypsum on a tool used to apply a calcium sulfate hemihydrate-containing composition to a surface as well as to a method for cleaning a tool having set gypsum deposited thereon. The method for cleaning a tool having set gypsum deposited thereon comprises the steps of (a) contacting the tool with a cleaning solution having a pH of less than about 7, said cleaning solution which comprises a non-calcium phosphate, water, and, optionally, a pH modifier; (b) optionally agitating the solution; (c) removing the tool from the cleaning solution; and (d) rinsing the tool with water. The method for minimizing the buildup of set gypsum on a tool further comprises step (e) using the tool to apply a calcium sulfate hemihydrate-containing composition. An additional step (f), flushing the tool with water, may also be employed. Optionally, steps (a) through (e) or (a) through (f) may be repeated during the application of the calcium sulfate hemihydrate-containing composition. Examples of non-calcium phosphates which may be used in the cleaning solution are sodium, potassium, or ammonium salts such as tetrasodium pyrophosphate, tetrapotassium pyrophosphate and sodium tripolyphosphate.
    • 本发明涉及一种使用于将表面上含有硫酸钙半水合物的组合物施用于工具上的凝结石膏的积聚最小化的方法以及用于清洁沉积有凝固石膏的工具的方法。 用于清洁其上沉积有石膏的工具的方法包括以下步骤:(a)使工具与pH小于约7的清洁溶液接触,所述清洁溶液包含非磷酸钙,水和任选地 ,pH调节剂; (b)任选地搅拌该溶液; (c)从清洁溶液中取出工具; 和(d)用水冲洗工具。 用于最小化工具上积聚石膏的方法还包括使用该工具施加含硫酸钙半水合物的组合物的步骤(e)。 还可以使用额外的步骤(f),用水冲洗工具。 任选地,在施用含硫酸钙半水合物的组合物期间可以重复步骤(a)至(e)或(a)至(f)。 可用于清洁溶液中的非磷酸钙的实例是钠,钾或铵盐,例如焦磷酸四钠,焦磷酸四钾和三聚磷酸钠。