CN106977166B - 一种塑化石膏及其制备方法 - Google Patents
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Classifications
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
- C04B28/146—Calcium sulfate hemi-hydrate with a specific crystal form alpha-hemihydrate
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical Kinetics & Catalysis (AREA)
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- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
一种塑化石膏及其制备方法,所述塑化石膏由以下重量百分比的原料制成:石膏粉、水30‑35%、三甲基磷酸钠0.1‑0.15%、氧化钙3‑3.5%、白水泥1‑1.5%、ASH添加剂5‑6%;所述水、三甲基磷酸钠、氧化钙、白水泥、ASH添加剂的百分比均以石膏粉重量为基数;所述ASH添加剂为醋酸乙烯酯‑乙烯聚合物可再分散塑化胶粉。本发明还包括所述塑化石膏的制备方法。本发明之塑化石膏可防止表面粉化和软化,具有一定的可塑性,抗折、抗拉强度高,附着性能和耐久性好。
Description
技术领域
本发明涉及一种石膏及其制备方法,具体涉及一种塑化石膏及其制备方法。
背景技术
普通建筑石膏最大的缺陷就是耐水性差,长期在空气环境下表面缓慢吸水潮解并损失强度,呈现粉状现象,使表层附着物松脱;同时,石膏材料的脆性大,抗折、抗拉强度低、塑性差等一直是石膏行业面临的难题。
发明内容
本发明所要解决的技术问题是,提供一种可防止表面粉化,增加石膏材料塑性,提高抗折、抗拉强度,附着性能和耐久性好的塑化石膏及其制备方法。
本发明在石膏基材中加入四种添加剂,改变石膏水化过程(从半水石膏转化成二水石膏)中的结晶环境,使晶体的结晶过程得到优化,从而生长出所期望的柱状形晶体,并使晶体间的分布和搭接更加合理,达到增加石膏材料塑性,提高抗折、抗拉强度,防止表面粉化的目的,这样不仅能提高材料的综合性能,更重要的是解决石膏材料对其它表面涂覆材料(油漆、树脂、粘贴材料等非水性涂层材料)附着性能差和耐久性差的难题。
本发明解决其技术问题所采用的技术方案是:
本发明之塑化石膏,由以下重量百分比的原料制成:
石膏粉、水30-35%、三甲基磷酸钠0.1-0.15%、氧化钙3-3.5%、白水泥(硅酸盐水泥)1-1.5%、ASH添加剂5-6%;所述水、三甲基磷酸钠、氧化钙、白水泥、ASH添加剂的百分比均以石膏粉重量为基数;
所述ASH添加剂为醋酸乙烯酯-乙烯聚合物可再分散塑化胶粉。
进一步,所述石膏粉为阿尔法石膏粉。
进一步,所述水为纯净水。
本发明之塑化石膏的制备方法,包括以下步骤:
先按预定质量百分配比称取各原料,然后向所称取的水中依次加入所称取的三甲基磷酸钠、氧化钙、白水泥、ASH添加剂,搅拌均匀,再边搅拌边加入石膏粉,得塑化石膏浆料,最后将所得的塑化石膏浆料倒入模具中,抖动模具排除气泡,用刮板除去溢浆,静置等待凝固后脱模,即可。
本发明中所用四种添加剂的作用机理如下:
(1)三甲基磷酸钠(0.1-0.15%)
三甲基磷酸钠为磷酸盐类的多聚磷酸盐,在掺量少的情况下能有效的促使大面积二水石膏晶体的生成和延长晶体生长的时间,使晶体生长得更长、更粗壮,减少针状晶体的生成量,使晶格间的搭接更牢固、更密实,提高石膏料材的刚性和韧性,增强其抗徐变能力。
(2)CaO(3-3.5%)
CaO在空气中的碳酸气的影响下转变为CaCO3,而CaCO3的溶解度为石膏溶解度的1/200,此肘石膏材料内的细粒实际上被几乎不溶于水的CaCO3所包覆而形成一层保护壳,使其混合材料的实密和耐水性能大幅度提高,当CaO加入量3-3.5%时,石膏硬化体抗折强度为最高峰值,且24h吸水率最低,耐水性最好。同时,CaO的掺入能改善石膏的易和性,它的水化发热量是石膏发热量的9倍多。这样不但减少了用水量,还有助于水分向外转移,加速二水石膏的凝固与干燥。
(3)白水泥(硅酸盐水泥)(1-1.5%)
白水泥(硅酸盐水泥)作为石膏制品的添加剂,主要是利用水泥中的C3A(铝酸三钙)与石膏生成钙矾石,以达别提高石膏的强度和水硬性、耐水性和抗溶蚀性。
(4)醋酸乙烯酯-乙烯聚合物可再分散塑化胶粉(简写为ASH)(5-6%)
ASH聚合物可再分散塑化胶粉与水、石膏为主要基材的浆料混合搅拌时便可再均匀分散。由于石膏混合体晶格存在大量的细微空隙和水化过程中产生的气体造成的微小气泡,导致材料内部密度欠佳,ASH聚合物可再分散塑化胶粉在水中充分再分散后,具有很强的扩散性和渗透性,利用其自身的粘结性能使石膏晶格搭接留下的空隙之间形成强有力的粘合和填充,ASH聚合物其自身特有的柔韧性和可塑性有效的消除石膏内部弱边界层和被粘物的内部结构缺陷,提高材料抗外力冲击和抗拉伸剥离的能力,最终可改善石膏制品的多种性能:提高材料的粘结力、内聚力,增强产品的韧性、塑性,石膏制品表面与其它涂覆材料之间不起粉、不分层,可大增强材料的力学性能和涂覆材料的附着性能,增强材料的抗折强度、抗冲击性能、耐磨性和耐久性,使脆性的石膏材料具有一定的塑性,其综合性能得到很大的改善。
本发明具有以下优点:
(1)各种添加剂市场有购,价格低,掺量少,成本低。
(2)制作工艺简单,无需增加设备,操作方便。
(3)材性的改良使传统的脆性石膏材料具有一定的可塑性,扩展了新的加工领域,特别是提高石膏表面涂层深加工材料品种的选择空间。
(4)由于材料具有抗潮解、粉化的性能,使其耐候性和耐久性大幅提升。
具体实施方式
以下结合实施例对本发明作进一步说明。
实施例
1.塑化石膏所用材料及配比见表1。
表1
材料名称 | 试样1 | 试样2 | 试样3 | 试样4 | 试样5 |
石膏粉(100%) | 1000 | 1000 | 1000 | 1000 | 1000 |
水(30-35%) | 300 | 310 | 320 | 330 | 340 |
三甲基磷酸钠(0.1-0.15%) | 1 | 1.1 | 1.2 | 1.3 | 1.4 |
CaO(3-3.5%) | 30 | 31 | 32 | 33 | 34 |
白水泥(1-1.5%) | 10 | 11 | 12 | 13 | 14 |
ASH(5-6%) | 50 | 51 | 52 | 53 | 54 |
注:表中添加剂质量以石膏粉质量为基数的份额数,单位(g)。
2.表中所述石膏粉为阿尔法石膏粉;
所述水为纯净水;
所述三甲基磷酸钠为一种磷酸盐;
所述CaO为一种无机化合物;
所述白水泥为一种硅酸钙无机化合物;
所述ASH为醋酸乙烯酯-乙烯聚合物可再分散塑化胶粉。
3.塑化石膏试样的制备方法;
在2000毫升的容器中先加入300克水,然后按照表1中试样1的材料配比量依次加入三甲基磷酸钠添加剂、CaO添加剂、白水泥添加剂、ASH添加剂搅拌均匀,再边搅边加入石膏粉,搅拌20秒,得塑化石膏浆料;
将所得到的塑化石膏浆料倒入三联模中,抖动三联模排除气泡,用刮板除去溢浆,静置等待凝固后脱模,两小时后进行湿强测试。利用余料检测标稠和凝固时间。
试样烘干、冷却至室温后进行吸水率检测。
重复上述方法进行试样2至试样5的配料操作。并制作用于进行延伸率、断面缩率、扭转角等塑性指标测试的试样。
4.塑化石膏试样检测结果见表2。
表2添加剂对石膏性能的影响
注:数据由三联模所出三个试样检测所得平均值。
5.实验参照标准:
实验条件符合GB/T17669.1-1999《建筑石膏力学性能的测定》一般试验条件;
a.塑化石膏凝结时间和标准稠度测定按照GB/T17669.2-1999《建筑石膏净浆物理性能的测定》中规定的方法操作;
b.塑化石膏的吸水率测定按照GB/T17669.4-1999《建筑石膏力学性能的测定》的方法操作;
c.塑化石膏力学性能测定按照GB/T17669.-1999《建筑石膏力学性能的测定》的方法操作;
d.塑化石膏的物理性能按照GB/T17669.4-1999《建筑石膏物理性能的测定》的方法操作。
从表2的数据分析可见,本发明通过对石膏基料掺入添加剂后,石膏制品的抗变形强度保持良好,同时,使完全脆性的石膏制品具有一定的塑性和韧性,使石膏表面综合强度大幅提升,确保其它涂覆材料与基材之间的粘接牢固度和耐久性。这种新型工艺所生产的石膏称之为塑化石膏。
Claims (4)
1.一种塑化石膏,其特征在于,由以下重量百分比的原料制成:
石膏粉、水30-35%、三甲基磷酸钠0.1-0.15%、氧化钙3-3.5%、白水泥1-1.5%、ASH添加剂5-6%;所述水、三甲基磷酸钠、氧化钙、白水泥、ASH添加剂的百分比均以石膏粉重量为基数;
所述ASH添加剂为醋酸乙烯酯-乙烯聚合物可再分散塑化胶粉。
2.根据权利要求1所述的塑化石膏,其特征在于,所述石膏粉为阿尔法石膏粉。
3.根据权利要求1或2所述的塑化石膏,其特征在于,所述水为纯净水。
4.一种如权利要求1所述的塑化石膏的制备方法,其特征在于,包括以下步骤:
先按预定质量百分配比称取各原料,然后向所称取的水中依次加入所称取的三甲基磷酸钠、氧化钙、白水泥、ASH添加剂,搅拌均匀,再边搅拌边加入所称取的石膏粉,得塑化石膏浆料,最后将所得的塑化石膏浆料倒入模具中,抖动模具排除气泡,用刮板除去溢浆,静置等待凝固后脱模,即可。
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