CN110475831A - 生产纤维素酯/丙烯酸系复合胶乳粒子的方法 - Google Patents
生产纤维素酯/丙烯酸系复合胶乳粒子的方法 Download PDFInfo
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- CN110475831A CN110475831A CN201880024835.7A CN201880024835A CN110475831A CN 110475831 A CN110475831 A CN 110475831A CN 201880024835 A CN201880024835 A CN 201880024835A CN 110475831 A CN110475831 A CN 110475831A
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- cellulose
- cellulose esters
- acrylate
- dispersion
- methacrylate
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- 238000000034 method Methods 0.000 title claims abstract description 47
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000000178 monomer Substances 0.000 claims abstract description 38
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- 239000007787 solid Substances 0.000 claims description 20
- -1 dimethylamino ethyl Chemical group 0.000 claims description 18
- 150000002148 esters Chemical class 0.000 claims description 15
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 11
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 11
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- 229920006218 cellulose propionate Polymers 0.000 claims description 8
- CIWBSHSKHKDKBQ-DUZGATOHSA-N D-isoascorbic acid Chemical compound OC[C@@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-DUZGATOHSA-N 0.000 claims description 7
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- DQEFEBPAPFSJLV-UHFFFAOYSA-N Cellulose propionate Chemical compound CCC(=O)OCC1OC(OC(=O)CC)C(OC(=O)CC)C(OC(=O)CC)C1OC1C(OC(=O)CC)C(OC(=O)CC)C(OC(=O)CC)C(COC(=O)CC)O1 DQEFEBPAPFSJLV-UHFFFAOYSA-N 0.000 claims description 5
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims description 5
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- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 4
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- 229920002284 Cellulose triacetate Polymers 0.000 claims description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 claims description 3
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical group [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 3
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- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 claims description 3
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- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 3
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 3
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert-Butyl hydroperoxide Substances CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 claims description 3
- LGJCFVYMIJLQJO-UHFFFAOYSA-N 1-dodecylperoxydodecane Chemical compound CCCCCCCCCCCCOOCCCCCCCCCCCC LGJCFVYMIJLQJO-UHFFFAOYSA-N 0.000 claims description 2
- IGGDKDTUCAWDAN-UHFFFAOYSA-N 1-vinylnaphthalene Chemical compound C1=CC=C2C(C=C)=CC=CC2=C1 IGGDKDTUCAWDAN-UHFFFAOYSA-N 0.000 claims description 2
- SJIXRGNQPBQWMK-UHFFFAOYSA-N 2-(diethylamino)ethyl 2-methylprop-2-enoate Chemical compound CCN(CC)CCOC(=O)C(C)=C SJIXRGNQPBQWMK-UHFFFAOYSA-N 0.000 claims description 2
- LPNSCOVIJFIXTJ-UHFFFAOYSA-N 2-methylidenebutanamide Chemical compound CCC(=C)C(N)=O LPNSCOVIJFIXTJ-UHFFFAOYSA-N 0.000 claims description 2
- RUMACXVDVNRZJZ-UHFFFAOYSA-N 2-methylpropyl 2-methylprop-2-enoate Chemical compound CC(C)COC(=O)C(C)=C RUMACXVDVNRZJZ-UHFFFAOYSA-N 0.000 claims description 2
- CFVWNXQPGQOHRJ-UHFFFAOYSA-N 2-methylpropyl prop-2-enoate Chemical compound CC(C)COC(=O)C=C CFVWNXQPGQOHRJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000004342 Benzoyl peroxide Substances 0.000 claims description 2
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Natural products CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 claims description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 2
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- ROPXFXOUUANXRR-YPKPFQOOSA-N bis(2-ethylhexyl) (z)-but-2-enedioate Chemical compound CCCCC(CC)COC(=O)\C=C/C(=O)OCC(CC)CCCC ROPXFXOUUANXRR-YPKPFQOOSA-N 0.000 claims description 2
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- QAHREYKOYSIQPH-UHFFFAOYSA-L cobalt(II) acetate Chemical compound [Co+2].CC([O-])=O.CC([O-])=O QAHREYKOYSIQPH-UHFFFAOYSA-L 0.000 claims description 2
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- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical group O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 claims description 2
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Abstract
本发明是生产纤维素酯和丙烯酸系复合胶乳粒子的方法和由所述方法制成的胶乳组合物。所述纤维素酯和丙烯酸系复合材料通过将至少一种纤维素酯分散在水中和在聚合引发剂存在下将至少一种丙烯酸系单体渐进添加到所述分散体中制备。任选加入表面活性剂和溶剂以助于纤维素酯在水中的分散。
Description
发明领域
本发明涉及胶乳粒子和含胶乳粒子的涂料组合物。本发明更特别涉及纤维素酯和丙烯酸系复合胶乳粒子和生产纤维素酯和丙烯酸系复合胶乳粒子的方法。
发明背景
建筑涂料行业不断寻找提高环境固化涂料的膜硬度而不使用在涂料固化过程中进入空气的挥发性有机聚结助剂的方式。胶乳制剂通过失水和聚合物粒子的聚结形成涂层,以形成内聚膜。为了实现这样的膜而不加入挥发性聚结助剂,胶乳聚合物必须是玻璃化转变温度(Tg)明显低于室温的软质可变形聚合物。所得软涂层在硬度、抗粘连性(blockresistance)和易沾污性方面具有缺陷。有时在胶乳粒子中并入单独的硬聚合物相以助于克服这些缺陷。一种类型的硬质聚合物是纤维素酯(CE)。CE类物质(CE’s)已通过有时被称为“细乳液聚合”的方法并入胶乳粒子中。将CE溶解在丙烯酸系单体中并借助表面活性剂和高剪切力将所得溶液分散在水中。这种方法具有许多限制,包括所需的表面活性剂含量、形成高剪切力所需的专用设备、调节丙烯酸系/CE的比率的灵活性不足和各种丙烯酸系单体的选择,和难以控制所得粒子的粒度和粒度分布。
需要不受这些限制的用于涂料用途的纤维素酯/丙烯酸系胶乳聚合物。
我们已经发明出改进的方法,由此首先将CE分散在水中并随时间经过逐渐加入丙烯酸系单体。单体迁移到CE粒子中,在此在大量单体可积聚之前单体迅速转化成丙烯酸系聚合物。
发明概述
根据一个实施方案,本公开涉及一种聚合产生复合粒子的方法,其包括:
(a) 将至少一种纤维素酯分散在水中;
(b) 将至少一种丙烯酸系单体和自由基聚合引发剂添加到步骤(a)的分散体中;和
(c) 使步骤(b)的所述纤维素酯和丙烯酸系单体分散体聚合。
根据本发明的另一实施方案,本公开涉及通过将至少一种纤维素酯分散在水中和在自由基聚合引发剂存在下将至少一种丙烯酸系单体渐进添加到所述分散体中以聚合产生所得纤维素酯和丙烯酸系复合材料而制成的纤维素酯和丙烯酸系复合材料。
在本发明的再一实施方案中,本公开涉及一种水性胶乳涂料组合物,其包含:
A.) 基于A和B的重量计40至55重量%的纤维素酯和丙烯酸系共聚物粒子,所述粒子通过将(i) 基于(i)和(ii)的总重量计2至40重量%的至少一种纤维素酯分散在水中和将基于(i)和(ii)的总重量计60至98重量%的(ii) 至少一种丙烯酸系单体在自由基聚合引发剂存在下添加到所述分散体中制备;和
B.) 基于A和B的总重量计45至60重量%水。
详述
乳胶漆具有许多问题,如易沾污性;低抗粘连性(衡量两个涂漆表面在将这些表面互相挤压时粘在一起的趋势的参数);和粘性(当温暖的手放在涂漆墙壁上时的粘着感)。减少这些问题的一种方法是通过改变在胶乳粒子合成过程中的单体组成来提高胶乳粒子的玻璃化转变温度(Tg)。提高玻璃化转变温度也被称为提高胶乳“硬度”。但是,高Tg胶乳粒子不容易通过变形和扩散在一起而形成内聚膜。可加入额外的聚结剂以降低高Tg胶乳粒子的最低成膜温度(MFFT),但有机聚结材料可能受制于挥发性有机化合物(VOC)排放法规。
改进软胶乳膜的性质的另一方式是将少量硬质聚合物并入胶乳粒子中。本发明包括包含CE和丙烯酸系聚合物的胶乳粒子。胶乳中的这两种聚合物是不同的相,并且不要求这两个相之间的化学键合或接枝。本发明在胶乳中并入CE,以改进胶乳膜的硬度,同时使MFFT的提高最小化。通过首先将CE分散在水中然后在引发聚合的自由基来源存在下逐渐加入丙烯酸系单体来生产这种CE/丙烯酸系复合粒子。
除非另行指明,说明书和权利要求书中所用的表示成分量、性质如分子量、反应条件等的所有数值应被理解为在所有情况下被术语“大约”修饰。除非作出相反指示,下列说明书和所附权利要求书中阐述的数值参数是可随本发明试图获得的所需性质而变的近似值。至少,应根据所报道的有效数位和通过应用普通舍入技术来解释各数值参数。此外,本公开和权利要求书中规定的范围旨在明确包括整个范围而不仅端点。例如,被规定为0至10的范围旨在公开0至10的所有整数,例如1、2、3、4等,0至10的所有分数,例如1.5、2.3、4.57、6.1113等,以及端点0和10。
虽然阐述本发明的宽范围的数值范围和参数是近似值,但尽可能精确地报道具体实施例中阐述的数值。但是,任何数值都固有地含有必然由其各自的试验测量中存在的标准偏差造成的某些误差。
除非上下文清楚地另行规定,说明书和所附权利要求书中所用的单数形式“一”和“该”包括它们的复数对象。例如,对一种“聚酯”、一种“二羧酸”、一种“残基”的提及与“至少一种”或“一种或多种”聚酯、二羧酸或残基同义,因此旨在表示单种或多种聚酯、二羧酸或残基。此外,提及含有或包括“一种”成分或“一种”聚酯的组合物旨在除指定的那种外还分别包括其它成分或其它聚酯。术语“含有”或“包括”旨在与术语“包含”同义,意味着在该组合物或制品或方法中存在至少指定化合物、元素、粒子或方法步骤等,但不排除存在其它化合物、催化剂、材料、粒子、方法步骤等,即使其它这样的化合物、材料、粒子、方法步骤等具有与指定的那种相同的功能,除非权利要求中明确地排除。
说明书和所附权利要求书中所用的术语“渐进”是指添加到纤维素酯的水性分散体中的一定量的丙烯酸系单体和引发剂(或其它材料)的一次或多次添加。这样的渐进添加可以是以时间间隔分开添加,或在一段时间内加入连续的逐渐量的丙烯酸系单体和引发剂。例如,可以间隔“Y”分钟的时间间隔将“X”毫升的独立装料添加到分散体中,或可以“Z”毫升/分钟的速率将连续进料添加到分散体中。
还要理解的是,提及一个或多个工艺步骤不排除在合并的所列步骤之前或之后存在附加工艺步骤或在明确规定的那些步骤之间插入工艺步骤。此外,除非另行指明,工艺步骤或成分的字母标记是识别分立的活动或成分的便利方式且所列字母标记可以以任何次序排列。
CE分散体可通过本领域中已知的任何分散方法生产,如在表面活性剂存在下混合在水中。为实现小粒度分散体,CE必须为液态——作为熔体或在适当溶剂中的溶液。
用于本发明的合适的纤维素酯可以是本领域中已知的任何CE。本发明的纤维素酯通常包含下列结构的重复单元:
其中R1、R2和R3独立地选自氢或具有2至10个碳原子的直链烷酰基。对于纤维素酯,取代水平通常以取代度(DS)表示,其是每脱水葡萄糖单元(AGU)的取代基平均数。通常,常规纤维素在各可被取代的AGU单元中含有三个羟基;因此,DS可具有0至3的值。但是,低分子量纤维素混合酯可具有大约3.08至大约3.5的总取代度。天然纤维素是具有700 – 2,000的聚合度的大多糖,因此最大DS为3.0的假设是大致正确的。但是,当聚合度降低时,如在低分子量纤维素混合酯中,多糖骨架的端基变得相对更重要,由此造成大约3.08至大约3.5的DS。由于DS是统计平均值,1的值不保证每一AGU具有单个取代基。在一些情况下,可存在未取代的脱水葡萄糖单元,一些具有两个且一些具有三个取代基,并且该值经常不是整数。总DS被定义为每脱水葡萄糖单元的所有取代基的平均数。每AGU的取代度也可涉及特定取代基,例如羟基、乙酰基、丁酰基或丙酰基。
所用纤维素酯可以是纤维素三酯或二纤维素酯(secondary cellulose ester)。纤维素三酯的实例包括但不限于三乙酸纤维素、三丙酸纤维素或三丁酸纤维素。二纤维素酯的实例包括乙酸纤维素、乙酸丙酸纤维素和乙酸丁酸纤维素。这些纤维素酯描述在美国专利1,698,049;1,683,347;1,880,808;1,880,560;1,984,147、2,129,052;和3,617,201中,它们在与本文中的叙述不矛盾的程度上全文并入本文作为参考。
在本发明的一个实施方案中,纤维素酯具有至少2个脱水葡萄糖环,并通常具有2至5,000个脱水葡萄糖环。每分子的脱水葡萄糖单元数被定义为纤维素酯的聚合度(DP)。纤维素酯通常具有如对于在100毫升的按重量计60/40苯酚/四氯乙烷溶液中的0.25克样品在25℃的温度下测得的大约0.2至大约3.0分升/克或大约1至大约1.5的特性粘度(IV)。在本发明的另一实施方案中,本文中可用的纤维素酯的每脱水葡萄糖单元的总取代度(DS/AGU)的范围可为大约0.5至大约2.8、大约1.5至大约3.0、和大约1.7至大约2.7。纤维素酯的实例包括但不限于乙酸纤维素、丙酸纤维素、丁酸纤维素、乙酸丙酸纤维素(CAP)、乙酸丁酸纤维素(CAB)、丙酸丁酸纤维素等。本文中可用的乙酸纤维素通常具有大约2.0至大约2.5的乙酰基DS/AGU。CAP和CAB通常具有大约1.7至大约2.8的总DS/AGU。
纤维素酯可通过本领域中已知的任何方法生产。生产纤维素酯的方法的实例教导在Kirk-Othmer, Encyclopedia of Chemical Technology, 第5版, Vol. 5, Wiley-Interscience, New York (2004), 第394-444页中。纤维素,用于生产纤维素酯的原材料,可以不同等级和来源获得,如来自棉短绒、软木浆、硬木浆、玉米纤维和其它农业资源,和细菌纤维素等。
一种生产纤维素酯的方法是通过将纤维素与适当的有机酸、酸酐和催化剂混合而将纤维素酯化。然后将纤维素转化成纤维素三酯。然后通过将水-酸混合物添加到纤维素三酯中进行酯水解,然后可过滤以除去任何凝胶粒子或纤维。然后将水添加到该混合物中以使纤维素酯沉淀。然后可用水洗涤纤维素酯以除去反应副产物,接着脱水和干燥。
待水解的纤维素三酯可具有三个取代基,独立地选自具有2至10个碳原子的烷酰基。纤维素三酯的实例包括三乙酸纤维素、三丙酸纤维素和三丁酸纤维素或混合纤维素三酯,如乙酸丙酸纤维素和乙酸丁酸纤维素。这些纤维素酯可通过本领域技术人员已知的许多方法制备。例如,纤维素酯可通过纤维素在羧酸和酐的混合物中在催化剂如H2SO4存在下的多相酰化制备。纤维素三酯也可通过溶解在适当的溶剂如氯化锂/二甲基乙酰胺(LiCl/DMAc)或氯化锂/N-甲基-2-吡咯烷酮(LiCl/NMP)中的纤维素的均相酰化制备。
本领域技术人员会理解的是,纤维素三酯的商业术语也包含没有完全被酰基取代的纤维素酯。例如,可商购自Eastman Chemical Company, Kingsport, TN, U.S.A.的三乙酸纤维素通常具有大约2.85至大约2.95的DS。
在纤维素酯化成三酯后,通过水解或通过醇解除去一部分酰基取代基以产生二纤维素酯。如上所述,根据所用的特定方法,酰基取代基的分布可以是无规或非无规的。也可使用有限量的酰化试剂无水解地直接制备二纤维素酯。当在溶解纤维素的溶剂中进行该反应时,这种方法特别有用。所有这些方法产生可用于本发明的纤维素酯。
在一个实施方案中,可用于本发明的二纤维素酯具有如通过GPC测得的大约5,000至大约400,000的重均分子量(Mw)。在进一步实施方案中,Mw为大约10,000至大约300,000。在再进一步实施方案中,Mw为大约10,000至大约250,000;大约10,000至大约100,000,和大约15,000至大约80,000。
二纤维素酯通过纤维素的最初酸催化的多相酰化以形成纤维素三酯制备。在获得纤维素三酯在相应羧酸中的均相溶液后,随后对纤维素三酯施以水解直至获得所需取代度。在分离后,获得无规二纤维素酯。也就是说,在各羟基处的相对取代度(RDS)大致相等。
上述纤维素酯也可含有可电离基团。可电离基团可包括硫酸半酯(如Philipp, B.等人, “Cellulose Sulphate Half-Ester. Synthesis, Structure and Properties,”Cellulose Chemistry and Technology, 1983, 第17卷, 第443-459页中所述)、甲苯磺酰基尿烷(如US 3,422,075中所述)和优选羧酸。羧酸官能团可由羧烷基(如US5,668,273中所述)、由二羧酸的半酯(如US 5,925,181中所述)或优选由CE的氧化(如US 8,816,066中所述)提供。
在一些实施方案中,可以不用表面活性剂将CE分散在水中。含离子官能团如羧酸根、硫酸根或磺酸根基团的CE类物质特别可用于形成无表面活性剂的分散体。该CE可以是乙酸纤维素、丙酸纤维素、丁酸纤维素、乙酸丁酸纤维素等,包括改性为包括离子官能团(羧酸根、硫酸根、磺酸根等)的CE类物质。
在一个实施方案中,本发明提供包含连接但不需要化学键合或接枝的CE和丙烯酸系聚合物的水性胶乳粒子。
本发明中的制造复合粒子的方法是在作为极小粒子分散在水中的CE中供入丙烯酸系单体,其通过水输送到CE粒子并在此聚合。各原始分散的CE粒子通过这种方法转化成丙烯酸系/CE复合材料。
在本发明的一个实施方案中,该合成方法可包括(<2%)表面活性剂、自由基引发剂和中和剂(neutralents),并在50-100℃下进行2-6小时的时间。
用于聚合产生本发明的聚合物的聚合方法也可能需要引发剂、还原剂或催化剂。
合适的引发剂包括常规引发剂,如过硫酸铵、过氧化氢、叔丁基过氧化氢、过硫酸钠、过硫酸钾、过氧化二苯甲酰、月桂基过氧化物、二叔丁基过氧化物、2,2'-偶氮二异丁腈(2,2'-azobisisobuteronitrile)、过氧化苯甲酰等。
合适的还原剂是提高聚合速率的那些,并包括例如亚硫酸氢钠、连二亚硫酸钠、次硫酸氢钠甲醛、抗坏血酸、异抗坏血酸及其混合物。
合适的催化剂是促进聚合引发剂在聚合反应条件下的活化由此提高聚合速率的那些化合物。合适的催化剂包括过渡金属化合物和干燥剂。这样的催化剂的实例包括但不限于七水合硫酸亚铁、氯化亚铁、硫酸铜、氯化铜、乙酸钴、硫酸亚钴(cobaltous sulfate)及其混合物。
任选地,在本发明的杂化胶乳的悬浮或乳液聚合制备中,可以使用常规表面活性剂或表面活性剂的组合作为助稳定剂或助表面活性剂,如阴离子型或非离子型乳化剂。在本发明的一些实施方案中,表面活性剂包括但不限于烷基硫酸碱盐或铵盐(alkali orammonium alkylsulfate)、烷基磺酸或脂肪酸、氧乙基化烷基酚,或阴离子型或非离子型表面活性剂的任何组合。
该复合胶乳组合物通常是2-40 wt% CE和60-98 wt%丙烯酸系聚合物、或1-40 wt%CE和60-99 wt%丙烯酸系聚合物、或0.5-40 wt% CE和60-99.5 wt%丙烯酸系聚合物、或0.1-40 wt% CE和60-99.9 wt%丙烯酸系聚合物、或2-30 wt% CE和70-98 wt%丙烯酸系聚合物、或1-30 wt% CE和70-99 wt%丙烯酸系聚合物、或0.5-30 wt% CE和70-99.5 wt%丙烯酸系聚合物、或0.1-30 wt% CE和70-99.9 wt%丙烯酸系聚合物、或2-20 wt% CE和80-98 wt%丙烯酸系聚合物、或1-20 wt% CE和80-99 wt%丙烯酸系聚合物、或0.5-20 wt% CE和80-99.5wt%丙烯酸系聚合物、或0.1-20 wt% CE和80-99.9 wt%丙烯酸系聚合物、或2-15 wt% CE和85-98 wt%丙烯酸系聚合物、或1-15 wt% CE和85-99 wt%丙烯酸系聚合物、或0.5-15 wt%CE和85-99.5 wt%丙烯酸系聚合物、或0.1-15 wt% CE和85-99.9 wt%丙烯酸系聚合物。
丙烯酸系单体可以是丙烯酸酯或甲基丙烯酸酯(丙烯酸乙酯、丙烯酸丁酯、丙烯酸甲酯、丙烯酸乙基己酯、甲基丙烯酸甲酯、甲基丙烯酸丁酯等)、甲基丙烯酸、丙烯酸、苯乙烯或它们的组合。合适的烯属不饱和共聚单体的实例包括但不限于苯乙烯类单体,如苯乙烯、a-甲基苯乙烯、乙烯基萘、乙烯基甲苯、氯甲基苯乙烯等;烯属不饱和物类,例如丙烯酸甲酯、丙烯酸、甲基丙烯酸、甲基丙烯酸甲酯、丙烯酸乙酯、甲基丙烯酸乙酯、丙烯酸丁酯、甲基丙烯酸丁酯、丙烯酸异丁酯、甲基丙烯酸异丁酯、丙烯酸乙基己酯、甲基丙烯酸乙基己酯、丙烯酸辛酯、甲基丙烯酸辛酯、甲基丙烯酸缩水甘油酯、碳二亚胺甲基丙烯酸酯、巴豆酸烷基酯、乙酸乙烯酯、马来酸二正丁酯、马来酸二辛酯等;和含氮单体,包括甲基丙烯酸叔丁基氨基乙酯、甲基丙烯酸二甲基氨基乙酯、甲基丙烯酸二乙基氨基乙酯、N,N-二甲基氨基丙基甲基丙烯酰胺(methacrylaniide)、甲基丙烯酸2-叔丁基氨基乙酯、丙烯酸N,N二甲基氨基乙酯、N-(2-甲基丙烯酰氧基-乙基)亚乙基脲和乙基丙烯酰胺基乙基亚乙基脲。
在一个实施方案中,该单体是丙烯酸丁酯(50-65 wt%)、甲基丙烯酸(1-5 wt%)、和甲基丙烯酸甲酯或苯乙烯(27-43 wt%)的组合。
本发明的CE复合胶乳可具有大约50-400 nm的粒度范围。在本发明的另一实施方案中,本发明的CE复合胶乳具有大约100-250 nm的粒子粒度范围。
可将该胶乳中和到pH 7-9。该CE复合胶乳通常具有在水中40-50 wt%固含量。在一个实施方案中,本发明提供将含有极少聚结剂的上述复合胶乳施加到基底上以在基底上形成涂层的方法。根据本体胶乳(bulk latex)的Tg,可以胶乳固含量的0%至20%的含量使用聚结剂,并可包括乳胶漆中常用的各种酯、酯醇和二醇醚。一些实例包括可获自EastmanChemical Company的TEXANOL™酯醇和OPTIFILM™ 400增强剂。
实施例
尽管有许多方式测试膜硬度,但摆测硬度和抗粘连性是两种非常常见的试验。摆测硬度的提高意味着该材料的表面更硬。抗粘连性是表面硬度的另一量度。当膜软和粘时,该膜会自己密封。
将CE-复合胶乳与不用纤维素酯制成的对照胶乳比较。也在代表性的配制漆体系中证实抗粘连性和摆测硬度差异。
实施例1: CE分散体的制备
在塑料一次性罐中使用具有两个叶片的高速混合器将90克可获自Eastman ChemicalCompany的乙酸丁酸纤维素(CAB)SOLUSTM 3050溶解在250克丙酮中。在搅拌下加入二甲胺(3.4克)。然后经大约10分钟加入水(470克)。所得分散体经100目筛网过滤。将消泡剂(0.15克可获自BASF的FOAMASTER® NXZ)添加到该分散体中。用环境浴温度对该分散体施以旋转蒸发以除去丙酮。该分散体经325目筛网过滤,以产生纤维素酯分散体实施例1。
实施例2: CE/丙烯酸系复合胶乳的合成
向配有冷凝器、氮气吹扫和表面下进料管的2000毫升树脂锅中加入500克水、13.3克DOWFAXTM 2A1表面活性剂(可获自Dow Chemical Company)、3.3克过硫酸铵引发剂和490克实施例1中制备的纤维素酯的17%固含量分散体。开始氮气吹扫并将反应器加热到85℃并在250 rpm下搅拌。将含有285克甲基丙烯酸甲酯、443克丙烯酸丁酯和22克甲基丙烯酸的单体混合物经3小时渐进供入反应器。该反应在85℃下保持另外1小时,然后冷却至室温。加入1毫升2%硫酸铁铵水溶液,接着1毫升70%过氧化氢、10毫升10%异抗坏血酸钠水溶液和125克水。该胶乳经100目金属筛网过滤并用37克5%氢氧化铵将pH提高到8.0。最终产物具有42.8%固含量和200 nm的粒度。
实施例3: CE/丙烯酸系复合胶乳的合成
向配有冷凝器、氮气吹扫和表面下进料管的2000毫升树脂锅中加入500克水、13.3克DOWFAXTM 2A1表面活性剂(可获自Dow Chemical Company)、3.3克过硫酸铵引发剂和245克实施例1中制备的纤维素酯的17%固含量分散体。开始氮气吹扫并将反应器加热到85℃并在250 rpm下搅拌。将含有300克甲基丙烯酸甲酯、467克丙烯酸丁酯和24克甲基丙烯酸的单体混合物经3小时渐进供入反应器。该反应在85℃下保持另外1小时,然后冷却至室温。加入1毫升2%硫酸铁铵水溶液,接着1毫升70%过氧化氢、10毫升10%异抗坏血酸钠水溶液和50克水。该胶乳经100目金属筛网过滤并用34克5%氢氧化铵将pH提高到8.0。最终产物具有45.3%固含量和200 nm的粒度。
实施例4: CE/较低Tg丙烯酸系复合胶乳的合成
向配有冷凝器、氮气吹扫和表面下进料管的2000毫升树脂锅中加入500克水、13.3克DOWFAXTM 2A1表面活性剂(可获自Dow Chemical Company)、3.3克过硫酸铵引发剂和490克实施例1中制备的纤维素酯的17%固含量分散体。开始氮气吹扫并将反应器加热到85℃并在250 rpm下搅拌。将含有225克甲基丙烯酸甲酯、503克丙烯酸丁酯和22克甲基丙烯酸的单体混合物经3小时渐进供入反应器。该反应在85℃下保持另外1小时,然后冷却至室温。加入1毫升2%硫酸铁铵水溶液,接着1毫升70%过氧化氢、10毫升10%异抗坏血酸钠水溶液和50克水。该胶乳经100目金属筛网过滤并用41克5%氢氧化铵将pH提高到8.0。最终产物具有44.6%固含量和200 nm的粒度。
实施例5: CE/苯乙烯-丙烯酸系复合胶乳的合成
向配有冷凝器、氮气吹扫和表面下进料管的2000毫升树脂锅中加入500克(g)水、13.3克DOWFAXTM 2A1表面活性剂、3.3克过硫酸铵引发剂和490克实施例1中制备的纤维素酯的17%固含量分散体。开始氮气吹扫并将反应器加热到85℃并在250 rpm下搅拌。将含有263克苯乙烯、465克丙烯酸丁酯和22克甲基丙烯酸的单体混合物经3小时供入反应器。该反应在85℃下保持另外1小时,然后冷却至室温。加入1毫升2%硫酸铁铵水溶液,接着1毫升70%过氧化氢、10毫升10%异抗坏血酸钠水溶液和65克水。该胶乳经100目金属筛网过滤并用51克5%氢氧化铵将pH提高到8.0。最终产物具有44.3%固含量和191 nm的粒度。
对比例6: 丙烯酸系胶乳对照物的合成
向配有冷凝器、氮气吹扫和表面下进料管的2000毫升树脂锅中加入900克水、13.3克DOWFAXTM表面活性剂、3.3克过硫酸铵引发剂和15克20%固含量的24 nm丙烯酸系胶乳晶种。开始氮气吹扫并将反应器加热到85℃并在250 rpm下搅拌。将含有342克甲基丙烯酸甲酯、531克丙烯酸丁酯和27克甲基丙烯酸的单体混合物经3小时供入反应器。该反应在85℃下保持另外1小时,然后冷却至室温。加入1毫升2%硫酸铁铵水溶液,接着1毫升70%过氧化氢和10毫升10%异抗坏血酸钠水溶液。该胶乳经100目金属筛网过滤并用16.1克10%氢氧化铵将pH提高到8.0。最终产物具有48.0%固含量和186 nm的粒度。
对比例7: 苯乙烯-丙烯酸系胶乳对照物的合成
向配有冷凝器、氮气吹扫和表面下进料管的2000毫升树脂锅中加入900克水、13.3克DOWFAXTM表面活性剂、3.3克过硫酸铵引发剂和15克20%固含量的24 nm丙烯酸系胶乳晶种。开始氮气吹扫并将反应器加热到85℃并在250 rpm下搅拌。将含有315克苯乙烯、558克丙烯酸丁酯和27克甲基丙烯酸的单体混合物经3小时供入反应器。该反应在85℃下保持另外1小时,然后冷却至室温。加入1毫升2%硫酸铁铵水溶液,接着1毫升70%过氧化氢和10毫升10%异抗坏血酸钠水溶液。该胶乳经100目金属筛网过滤并用19克10%氢氧化铵将pH提高到8.0。最终产物具有48.5%固含量和189 nm的粒度。
实施例8: 胶乳膜试验(MFFT、摆测硬度和抗粘连性)
通过ASTM D2354-10e1测试胶乳的最低成膜温度(MFFT),通过ASTM D4946测试透明膜的抗粘连性,并通过ASTM D4366测试随时间经过的摆测硬度。在6密尔膜厚度下测试MFFT。以6密尔湿膜厚度制备用于摆测硬度的膜,并在1、7和28天干燥时间测试样品。以3密尔湿膜厚度制备用于抗粘连性的膜,并在7、14和28天干燥时间测试样品;将样品置于50℃炉中30分钟,然后冷却到室温30分钟。用于这种透明胶乳膜测试的重量为454克。基于该方法内的评分表评估抗粘连性(表1)。
复合胶乳的MFFT通常略高于对照胶乳,提高大约2-4℃。通过ASTM评级,复合胶乳的抗粘连性读数明显高于对照物(对照物的读数通常为0~1)。对于复合丙烯酸系胶乳,摆测硬度也更高。
表1. 胶乳膜试验
实施例9: 对配制漆的膜试验(低温聚结(LTC)、摆测硬度和抗粘连性)
该漆制剂是具有35%的颜料体积浓度(PVC)、大约42%的体积固含量和大约56%的重量固含量的模型制剂。通过ASTM D7306-07仅使用10密尔湿膜测试低温聚结并如试验方法中所述评级,通过ASTM D4946测试抗粘连性,并通过ASTM D4366测试随时间经过的摆测硬度。以3密尔湿膜厚度制备用于抗粘连性的膜,并在7、14和28天干燥时间测试样品;将样品置于50℃炉中30分钟,然后冷却到室温30分钟。基于该方法内的评分表评估抗粘连性。以6密尔湿膜厚度制备用于摆测硬度的膜,并在1、7和28天干燥时间测试样品(表2)。
表2. 配制漆膜试验
摆测硬度结果表明将CE并入聚合物中与对比例相比提高膜硬度。试验还表明将CE并入聚合物中与对比例相比显著提高抗粘连性。
已特别参照其优选实施方案详细描述了本发明,但要理解的是,可在本发明的精神和范围内作出变动和修改。
Claims (20)
1.一种聚合产生复合粒子的方法,其包括:
(a) 将至少一种纤维素酯分散在水中;
(b) 将至少一种丙烯酸系单体和聚合引发剂添加到步骤(a)的分散体中;和
(c) 使步骤(b)的所述纤维素酯和丙烯酸系单体分散体聚合。
2.权利要求1的方法,其中所述丙烯酸系单体是丙烯酸盐、甲基丙烯酸盐、丙烯酸酯或甲基丙烯酸酯或其混合物。
3.权利要求1的方法,其中所述丙烯酸系单体是丙烯酸乙酯、丙烯酸丁酯、丙烯酸甲酯、丙烯酸乙基己酯、甲基丙烯酸甲酯、甲基丙烯酸丁酯、甲基丙烯酸、丙烯酸、苯乙烯或其混合物。
4.权利要求1的方法,其中所述丙烯酸系单体是苯乙烯、a-甲基苯乙烯、乙烯基萘、乙烯基甲苯、氯甲基苯乙烯或其混合物。
5.权利要求1的方法,其中所述丙烯酸系单体是丙烯酸甲酯、丙烯酸、甲基丙烯酸、甲基丙烯酸甲酯、丙烯酸乙酯、甲基丙烯酸乙酯、丙烯酸丁酯、甲基丙烯酸丁酯、丙烯酸异丁酯、甲基丙烯酸异丁酯、丙烯酸乙基己酯、甲基丙烯酸乙基己酯、丙烯酸辛酯、甲基丙烯酸辛酯、甲基丙烯酸缩水甘油酯、碳二亚胺甲基丙烯酸酯、巴豆酸烷基酯、乙酸乙烯酯、马来酸二正丁酯、马来酸二辛酯或其混合物。
6.权利要求1的方法,其中所述丙烯酸系单体是甲基丙烯酸叔丁基氨基乙酯、甲基丙烯酸二甲基氨基乙酯、甲基丙烯酸二乙基氨基乙酯、N,N-二甲基氨基丙基甲基丙烯酰胺、甲基丙烯酸2-叔丁基氨基乙酯、丙烯酸N,N二甲基氨基乙酯、N-(2-甲基丙烯酰氧基-乙基)亚乙基脲、乙基丙烯酰胺基乙基亚乙基脲或其混合物。
7.权利要求1的方法,其中所述纤维素酯是乙酸纤维素、丙酸纤维素、丁酸纤维素、乙酸丁酸纤维素、三乙酸纤维素、三丙酸纤维素、三丁酸纤维素、乙酸丙酸纤维素、乙酸丁酸纤维素和丙酸丁酸纤维素或其混合物。
8.权利要求7的方法,其中所述纤维素酯是用羧酸根、硫酸根或磺酸根官能团改性的纤维素酯。
9.权利要求1的方法,其中所述引发剂是过硫酸铵、碳酸铵、过氧化氢、叔丁基过氧化氢、硫酸铵盐或硫酸碱盐、过氧化二苯甲酰、月桂基过氧化物、二叔丁基过氧化物、2,2'-偶氮二异丁腈、过氧化苯甲酰或其混合物。
10.权利要求1的方法,其进一步包括将至少一种还原剂添加到步骤(a)的分散体中。
11.权利要求10的方法,其中所述还原剂是亚硫酸氢钠、连二亚硫酸钠、次硫酸氢钠甲醛、抗坏血酸、异抗坏血酸或其混合物。
12.权利要求1的方法,其进一步包括将至少一种催化剂添加到步骤(a)的分散体中。
13.权利要求12的方法,其中所述催化剂是七水合硫酸亚铁、氯化亚铁、硫酸铜、氯化铜、乙酸钴、硫酸亚钴或其混合物。
14.权利要求1的方法,其中所述丙烯酸系单体是丙烯酸丁酯、甲基丙烯酸、甲基丙烯酸甲酯或苯乙烯的至少两种的混合物。
15.权利要求1的方法,其进一步包括将表面活性剂添加到步骤(a)的分散体中。
16.权利要求1的方法,其中所述表面活性剂是烷基二苯醚二磺酸盐或聚氧乙烯烷基苯基醚硫酸铵或其混合物。
17.权利要求1的方法,其中在步骤(b)中的丙烯酸系单体的添加经0.5至4小时的时间段渐进添加。
18.一种纤维素酯和丙烯酸系复合胶乳粒子,其包含:
(a) 基于总固含量计2至40重量%的量的至少一种纤维素酯;和
(b) 基于总固含量计60至98重量%的量的至少一种丙烯酸系聚合物;其中所述粒子通过将所述至少一种纤维素酯分散在水中和在自由基聚合引发剂存在下将所述至少一种丙烯酸系单体渐进添加到所述分散体中制备。
19.一种水性胶乳涂料组合物,其包含:
A.) 40-50重量%纤维素酯和丙烯酸系共聚物粒子,其通过将基于总固含量计2至40重量%的至少一种纤维素酯分散在水中和在自由基聚合引发剂存在下将基于总固含量计60至98重量%的至少一种丙烯酸系单体渐进添加到所述分散体中制备;和
B.) 基于A和B的总重量计补充至100重量%的余量水。
20.一种聚合产生复合粒子的方法,其包括:
(a) 将至少一种纤维素酯溶解在挥发性有机溶剂中;
(b) 将步骤(a)的纤维素酯/溶剂共混物分散在水中;
(c) 除去所述挥发性有机溶剂;
(d) 将至少一种丙烯酸系单体和聚合引发剂添加到步骤(c)的分散体中;和
(e) 使步骤(d)的所述纤维素酯和丙烯酸系单体分散体聚合。
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