CN103819637A - Polycarboxylic water reducer containing beta-cyclodextrin and lignin as well as preparation method and use method of polycarboxylic water reducer - Google Patents
Polycarboxylic water reducer containing beta-cyclodextrin and lignin as well as preparation method and use method of polycarboxylic water reducer Download PDFInfo
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- 229920005610 lignin Polymers 0.000 title claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 229920000858 Cyclodextrin Polymers 0.000 title claims abstract description 39
- 239000001116 FEMA 4028 Substances 0.000 title claims abstract description 39
- 229960004853 betadex Drugs 0.000 title claims abstract description 39
- WHGYBXFWUBPSRW-FOUAGVGXSA-N beta-cyclodextrin Chemical compound OC[C@H]([C@H]([C@@H]([C@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O3)[C@H](O)[C@H]2O)CO)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H]3O[C@@H]1CO WHGYBXFWUBPSRW-FOUAGVGXSA-N 0.000 title claims abstract description 37
- 235000011175 beta-cyclodextrine Nutrition 0.000 title claims abstract description 37
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 48
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 30
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 22
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims abstract description 22
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000004567 concrete Substances 0.000 claims abstract description 20
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 18
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 claims abstract description 16
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 16
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 239000004568 cement Substances 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 5
- 230000014759 maintenance of location Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000011376 self-consolidating concrete Substances 0.000 abstract description 2
- 229920001353 Dextrin Polymers 0.000 abstract 1
- 239000004375 Dextrin Substances 0.000 abstract 1
- 239000007864 aqueous solution Substances 0.000 abstract 1
- 238000007334 copolymerization reaction Methods 0.000 abstract 1
- 235000019425 dextrin Nutrition 0.000 abstract 1
- 150000003254 radicals Chemical class 0.000 abstract 1
- 230000000740 bleeding effect Effects 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- 239000008030 superplasticizer Substances 0.000 description 3
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 2
- 239000011976 maleic acid Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000000844 transformation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
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- Curing Cements, Concrete, And Artificial Stone (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
本发明涉及一种含β-环糊精和木质素的聚羧酸系减水剂、制备方法及其使用方法,本发明采用的原材料为：烯丙基聚乙二醇、丙烯酸、β-环糊精、马来酸酐、木质素、氢氧化钠、过硫酸钾和水。本发明通过水溶液自由基共聚工艺，制备了一种含β-环糊精和木质素的聚羧酸系减水剂，这种聚羧酸系减水剂具有高减水率，高保坍性、高保水性，且增强效果理想。这种聚羧酸系减水剂生产工艺简单，产品可在大流动性混凝土、自密实混凝土以及低水泥用量混凝土中应用，市场前景广阔。The invention relates to a polycarboxylate water-reducer containing β-cyclodextrin and lignin, a preparation method and a use method thereof. The raw materials used in the invention are: allyl polyethylene glycol, acrylic acid, β-cyclodextrin Dextrin, Maleic Anhydride, Lignin, Sodium Hydroxide, Potassium Persulfate and Water. The present invention prepares a polycarboxylate water reducer containing β-cyclodextrin and lignin through an aqueous solution free radical copolymerization process. This polycarboxylate water reducer has high water reducing rate, high slump retention, High water retention with ideal enhancement. The production process of this polycarboxylate water reducer is simple, and the product can be applied in high fluidity concrete, self-compacting concrete and concrete with low cement content, and has broad market prospects.
Description
技术领域 technical field
本发明属建筑材料技术领域，具体涉及一种含β-环糊精和木质素的聚羧酸系减水剂、制备方法及其使用方法。 The invention belongs to the technical field of building materials, and in particular relates to a polycarboxylate water reducer containing β-cyclodextrin and lignin, a preparation method and a use method thereof.
背景技术 Background technique
混凝土减水剂是混凝土节能减排、高性能化的重要措施。聚羧酸系减水剂代表了减水剂家族的最新技术，是研究和生产的热点。它具有掺量低、减水率高、对凝结时间影响小、混凝土坍落度保持性好、收缩率低、环保无污染等优点。但掺聚羧酸系减水剂的混凝土与水泥适应性不佳，容易导致混凝土泌水、离析等生产难题，有时甚至引起巨大的工程事故，经济损失相当严重。 Concrete water reducer is an important measure for energy saving, emission reduction and high performance of concrete. Polycarboxylate superplasticizer represents the latest technology of the superplasticizer family and is a hot spot in research and production. It has the advantages of low dosage, high water reducing rate, little effect on setting time, good concrete slump retention, low shrinkage, environmental protection and no pollution. However, the adaptability of concrete and cement mixed with polycarboxylate superplasticizers is not good, which may easily lead to production problems such as concrete bleeding and segregation, and sometimes even cause huge engineering accidents and serious economic losses.
为解决掺加聚羧酸系减水剂混凝土的保水性和增粘性等技术难题，本发明提出了一种含β-环糊精和木质素的聚羧酸系减水剂的制备方法。用这种方法合成的聚羧酸系减水剂在减水、保坍、增粘和保水方面具有综合的技术优势。 In order to solve technical problems such as water retention and viscosity increasing of concrete mixed with polycarboxylate water reducer, the present invention proposes a preparation method of polycarboxylate water reducer containing β-cyclodextrin and lignin. The polycarboxylate water reducer synthesized by this method has comprehensive technical advantages in water reduction, slump retention, viscosity increase and water retention.
发明内容 Contents of the invention
本发明的目的在于提供一种含β-环糊精和木质素的聚羧酸系减水剂、制备方法及其使用方法，旨在解决现有技术中所存在的技术难题。 The purpose of the present invention is to provide a polycarboxylate water reducer containing β-cyclodextrin and lignin, a preparation method and a use method thereof, aiming at solving the technical problems existing in the prior art.
本发明的技术方案如下： Technical scheme of the present invention is as follows:
一种含β-环糊精和木质素的保水型聚羧酸系减水剂，包括烯丙基聚乙二醇、丙烯酸、β-环糊精、马来酸酐、木质素、氢氧化钠、过硫酸钾和水。各原材料的重量比为： A water-retaining polycarboxylate superplasticizer containing β-cyclodextrin and lignin, including allyl polyethylene glycol, acrylic acid, β-cyclodextrin, maleic anhydride, lignin, sodium hydroxide, potassium persulfate and water. The weight ratio of each raw material is:
烯丙基聚乙二醇 100 Allyl Polyethylene Glycol 100
丙烯酸 10-60 Acrylic 10-60
β-环糊精 5-30 β-cyclodextrin 5-30
马来酸酐 2-60 Maleic anhydride 2-60
木质素 3-15 Lignin 3-15
氢氧化钠 2-30 Sodium Hydroxide 2-30
过硫酸钾 0.5-20 Potassium persulfate 0.5-20
水 200-410。 Water 200-410.
本发明中，所述含β-环糊精和木质素的聚羧酸系减水剂为淡黄色透明液体，浓度为20%-60%。 In the present invention, the polycarboxylate water reducer containing β-cyclodextrin and lignin is light yellow transparent liquid with a concentration of 20%-60%.
本发明提出的一种含β-环糊精和木质素的聚羧酸系减水剂的制备方法，具体步骤如下： A kind of preparation method of the polycarboxylate water reducing agent that the present invention proposes containing β-cyclodextrin and lignin, concrete steps are as follows:
1) 准确称取各原材料，在第一反应釜中加入β-环糊精和木质素，搅拌、溶解后，再加入马来酸酐，不断搅拌并升温至70-90℃，反应4-10小时，得到马来酸酐-β-环糊精-木质素溶液，备用； 1) Accurately weigh each raw material, add β-cyclodextrin and lignin into the first reaction kettle, stir and dissolve, then add maleic anhydride, stir continuously and raise the temperature to 70-90°C, and react for 4-10 hours , to obtain maleic anhydride-β-cyclodextrin-lignin solution, for subsequent use;
2) 在第二反应釜中加入水和烯丙基聚乙二醇，溶解，搅拌均匀，并向第二反应釜内通入保护气体氮气，插上冷凝管； 2) Add water and allyl polyethylene glycol into the second reaction kettle, dissolve, stir evenly, and pass protective gas nitrogen into the second reaction kettle, and insert a condenser tube;
3) 在60-100℃温度下，往第二反应釜内分别滴加丙烯酸、马来酸酐-β-环糊精-木质素溶液以及过硫酸钾溶液；丙烯酸和马来酸酐-β-环糊精-木质素溶液的滴加时间分别为1-3小时，过硫酸钾溶液的滴加时间为2-4小时； 3) At a temperature of 60-100°C, add acrylic acid, maleic anhydride-β-cyclodextrin-lignin solution and potassium persulfate solution dropwise into the second reaction kettle; acrylic acid and maleic anhydride-β-cyclodextrin The time for adding the essence-lignin solution is 1-3 hours, and the time for adding the potassium persulfate solution is 2-4 hours;
4) 滴加完毕后保温反应1-2小时，自然降温后用氢氧化钠溶液调节pH值到7-9，即得所需产品。 4) After the dropwise addition, keep the temperature and react for 1-2 hours. After cooling down naturally, adjust the pH value to 7-9 with sodium hydroxide solution to obtain the desired product.
本发明提出的一种含β-环糊精和木质素的聚羧酸系减水剂的使用方法，其中，在混凝土中掺入聚羧酸系减水剂的量为水泥质量的0.6%-1.4%。 The present invention proposes a method for using a polycarboxylate water reducer containing β-cyclodextrin and lignin, wherein the amount of the polycarboxylate water reducer mixed into the concrete is 0.6%- 1.4%.
本发明的有益效果在于：本发明的提供一种含β-环糊精和木质素的聚羧酸系减水剂的制备方法，该制备工艺简单，原材料价格低廉，所得到的产品性能稳定。在混凝土中掺入占水泥质量0.6%-1.4%的该产品，能使其具有高减水率、高保水性、高保坍型，能满足较高的施工要求，并在一定程度上提高混凝土强度。该产品可广泛应用于各种预拌混凝土中。本发明采用烯丙基聚乙二醇、丙烯酸、β-环糊精、马来酸酐、木质素、氢氧化钠、过硫酸钾和水为原料,通过水溶液自由基共聚工艺，制备了一种含β-环糊精和木质素的聚羧酸系减水剂，这种聚羧酸系减水剂不仅减水率高，增强效果好，而且可极大地改善混凝土的保水性和粘聚性。这种减水剂在大流动性混凝土和自密实混凝土、以及低水泥用量混凝土中有很大的技术优势，市场前景很广阔。 The beneficial effects of the present invention are: the present invention provides a preparation method of polycarboxylate water-reducer containing β-cyclodextrin and lignin, the preparation process is simple, the raw material price is low, and the obtained product has stable performance. Adding this product, which accounts for 0.6%-1.4% of the cement mass, can make it have high water-reducing rate, high water retention, high slump retention type, meet higher construction requirements, and improve concrete strength to a certain extent. This product can be widely used in various ready-mixed concrete. The present invention adopts allyl polyethylene glycol, acrylic acid, β-cyclodextrin, maleic anhydride, lignin, sodium hydroxide, potassium persulfate and water as raw materials, and prepares a compound containing β-cyclodextrin and lignin polycarboxylate water reducer, this polycarboxylate water reducer not only has high water reducing rate and good reinforcement effect, but also can greatly improve the water retention and cohesion of concrete. This water reducer has great technical advantages in high fluidity concrete, self-compacting concrete, and low cement content concrete, and has a broad market prospect.
具体实施方式 Detailed ways
本发明提供一种含β-环糊精和木质素的聚羧酸系减水剂、制备方法及其使用方法，为使本发明的目的、技术方案及效果更加清楚、明确，以下对本发明进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。 The present invention provides a polycarboxylate water reducer containing β-cyclodextrin and lignin, its preparation method and its use method. Detailed description. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
实施例1 Example 1
一种含β-环糊精和木质素的聚羧酸系减水剂，原材料重量比为烯丙基聚乙二醇100，丙烯酸10，β-环糊精5，马来酸酐2，木质素3，氢氧化钠2，过硫酸钾0.5，水410。合成过程如下：准确称取各原材料，在反应釜中加入β-环糊精和木质素，搅拌，溶解后，再加入马来酸酐，不断搅拌并升温至70℃，反应4小时，得到马来酸酐-β-环糊精-木质素溶液，备用；在另一反应釜中加入适量水和烯丙基聚乙二醇，溶解，搅拌均匀，并向反应釜内通入保护气体氮气，插上冷凝管；在60℃温度下，分别滴加丙烯酸、马来酸酐-β-环糊精-木质素溶液以及过硫酸钾溶液；丙烯酸和马来酸酐-β-环糊精-木质素溶液的滴加时间为1小时，过硫酸钾溶液的滴加时间为2小时，滴加完毕保温反应1小时。自然降温后用氢氧化钠溶液调节pH值到7-9。掺入占水泥质量1.4%的该产品，减水率为27%，混凝土坍落度达22cm，泌水率为0，1小时后坍落度为18cm，28天抗压强度比为129%。 A polycarboxylate water reducer containing β-cyclodextrin and lignin, the weight ratio of raw materials is allyl polyethylene glycol 100, acrylic acid 10, β-cyclodextrin 5, maleic anhydride 2, lignin 3. Sodium hydroxide 2, potassium persulfate 0.5, water 410. The synthesis process is as follows: Accurately weigh each raw material, add β-cyclodextrin and lignin into the reaction kettle, stir and dissolve, then add maleic anhydride, stir continuously and raise the temperature to 70°C, and react for 4 hours to obtain maleic anhydride Acid anhydride-β-cyclodextrin-lignin solution, for later use; add appropriate amount of water and allyl polyethylene glycol to another reaction kettle, dissolve, stir evenly, and pass protective gas nitrogen into the reaction kettle, plug in Condenser tube; at a temperature of 60°C, add acrylic acid, maleic anhydride-β-cyclodextrin-lignin solution and potassium persulfate solution dropwise; acrylic acid and maleic anhydride-β-cyclodextrin-lignin solution dropwise The adding time is 1 hour, the dropping time of the potassium persulfate solution is 2 hours, and the reaction is kept for 1 hour after the dropping is completed. After natural cooling, adjust the pH value to 7-9 with sodium hydroxide solution. Adding this product which accounts for 1.4% of the cement mass, the water reducing rate is 27%, the concrete slump reaches 22cm, the bleeding rate is 0, the slump after 1 hour is 18cm, and the 28-day compressive strength ratio is 129%.
实施例2 Example 2
一种含β-环糊精和木质素的聚羧酸系减水剂，原材料重量比为烯丙基聚乙二醇100，丙烯酸60，β-环糊精30，马来酸酐60，木质素15，氢氧化钠30，过硫酸钾20，水200。合成过程如下：准确称取各原材料，在反应釜中加入β-环糊精和木质素，搅拌，溶解后，再加入马来酸酐，不断搅拌并升温至90℃，反应10小时，得到马来酸酐-β-环糊精-木质素溶液，备用；在另一反应釜中加入适量水和烯丙基聚乙二醇，溶解，搅拌均匀，并向反应釜内通入保护气体氮气，插上冷凝管；在100℃温度下，分别滴加丙烯酸、马来酸酐-β-环糊精-木质素溶液以及过硫酸钾溶液；丙烯酸和马来酸酐-β-环糊精-木质素溶液的滴加时间为3小时，过硫酸钾溶液的滴加时间为4小时，滴加完毕保温反应2小时。自然降温后用氢氧化钠溶液调节pH值到7-9。掺入占水泥质量0.6%的该产品，减水率为25%，混凝土坍落度达21cm，泌水率为0，1小时后坍落度为17cm，28天抗压强度比为132%。 A polycarboxylate water reducer containing β-cyclodextrin and lignin, the weight ratio of raw materials is allyl polyethylene glycol 100, acrylic acid 60, β-cyclodextrin 30, maleic anhydride 60, lignin 15, sodium hydroxide 30, potassium persulfate 20, water 200. The synthesis process is as follows: Accurately weigh each raw material, add β-cyclodextrin and lignin into the reaction kettle, stir and dissolve, then add maleic anhydride, stir continuously and raise the temperature to 90°C, and react for 10 hours to obtain maleic acid Acid anhydride-β-cyclodextrin-lignin solution, for later use; add appropriate amount of water and allyl polyethylene glycol to another reaction kettle, dissolve, stir evenly, and pass protective gas nitrogen into the reaction kettle, plug in Condenser tube; at 100°C, add acrylic acid, maleic anhydride-β-cyclodextrin-lignin solution and potassium persulfate solution dropwise; acrylic acid and maleic anhydride-β-cyclodextrin-lignin solution dropwise The adding time is 3 hours, the dropping time of the potassium persulfate solution is 4 hours, and the reaction is kept for 2 hours after the dropping is completed. After natural cooling, adjust the pH value to 7-9 with sodium hydroxide solution. Mixed with this product accounting for 0.6% of the cement mass, the water reducing rate is 25%, the concrete slump reaches 21cm, the bleeding rate is 0, the slump after 1 hour is 17cm, and the 28-day compressive strength ratio is 132%.
实施例3 Example 3
一种含β-环糊精和木质素的聚羧酸系减水剂，原材料重量比为烯丙基聚乙二醇100，丙烯酸50，β-环糊精20，马来酸酐30，木质素10，氢氧化钠20，过硫酸钾10，水300。合成过程如下：准确称取各原材料，在反应釜中加入β-环糊精和木质素，搅拌，溶解后，再加入马来酸酐，不断搅拌并升温至80℃，反应6小时，得到马来酸酐-β-环糊精-木质素溶液，备用；在另一反应釜中加入适量水和烯丙基聚乙二醇，溶解，搅拌均匀，并向反应釜内通入保护气体氮气，插上冷凝管；在90℃温度下，分别滴加丙烯酸、马来酸酐-β-环糊精-木质素溶液以及过硫酸钾溶液；丙烯酸和马来酸酐-β-环糊精-木质素溶液的滴加时间为2小时，过硫酸钾溶液的滴加时间为3小时，滴加完毕保温反应1.5小时。自然降温后用氢氧化钠溶液调节pH值到7-9。掺入占水泥质量1.2%的该产品，减水率为27%，混凝土坍落度达23cm，泌水率为0，1小时后坍落度为19cm，28天抗压强度比为130%。 A polycarboxylate water reducer containing β-cyclodextrin and lignin, the weight ratio of raw materials is allyl polyethylene glycol 100, acrylic acid 50, β-cyclodextrin 20, maleic anhydride 30, lignin 10, sodium hydroxide 20, potassium persulfate 10, water 300. The synthesis process is as follows: Accurately weigh each raw material, add β-cyclodextrin and lignin into the reaction kettle, stir and dissolve, then add maleic anhydride, stir continuously and raise the temperature to 80°C, and react for 6 hours to obtain maleic anhydride Acid anhydride-β-cyclodextrin-lignin solution, for later use; add appropriate amount of water and allyl polyethylene glycol to another reaction kettle, dissolve, stir evenly, and pass protective gas nitrogen into the reaction kettle, plug in Condenser tube; at a temperature of 90°C, add acrylic acid, maleic anhydride-β-cyclodextrin-lignin solution and potassium persulfate solution dropwise; acrylic acid and maleic anhydride-β-cyclodextrin-lignin solution dropwise The adding time was 2 hours, the dropping time of the potassium persulfate solution was 3 hours, and the reaction was incubated for 1.5 hours after the dropping was completed. After natural cooling, adjust the pH value to 7-9 with sodium hydroxide solution. Mixed with this product which accounts for 1.2% of the cement mass, the water reducing rate is 27%, the concrete slump reaches 23cm, the bleeding rate is 0, the slump after 1 hour is 19cm, and the 28-day compressive strength ratio is 130%.
实施例4 Example 4
一种含β-环糊精和木质素的聚羧酸系减水剂，原材料重量比为烯丙基聚乙二醇100，丙烯酸40，β-环糊精30，马来酸酐2，木质素3，氢氧化钠10，过硫酸钾5，水320。合成过程如下：准确称取各原材料，在反应釜中加入β-环糊精和木质素，搅拌，溶解后，再加入马来酸酐，不断搅拌并升温至70℃，反应8小时，得到马来酸酐-β-环糊精-木质素溶液，备用；在另一反应釜中加入适量水和烯丙基聚乙二醇，溶解，搅拌均匀，并向反应釜内通入保护气体氮气，插上冷凝管；在70℃温度下，分别滴加丙烯酸、马来酸酐-β-环糊精-木质素溶液以及过硫酸钾溶液；丙烯酸和马来酸酐-β-环糊精-木质素溶液的滴加时间为1小时，过硫酸钾溶液的滴加时间为4小时，滴加完毕保温反应2小时。自然降温后用氢氧化钠溶液调节pH值到7-9。掺入占水泥质量1.4%的该产品，减水率为30%，混凝土坍落度达21cm，泌水率为0，1小时后坍落度为21cm，28天抗压强度比为141%。 A polycarboxylate water reducer containing β-cyclodextrin and lignin, the weight ratio of raw materials is allyl polyethylene glycol 100, acrylic acid 40, β-cyclodextrin 30, maleic anhydride 2, lignin 3. Sodium hydroxide 10, potassium persulfate 5, water 320. The synthesis process is as follows: Accurately weigh each raw material, add β-cyclodextrin and lignin into the reaction kettle, stir and dissolve, then add maleic anhydride, stir continuously and raise the temperature to 70°C, and react for 8 hours to obtain maleic acid Acid anhydride-β-cyclodextrin-lignin solution, for later use; add appropriate amount of water and allyl polyethylene glycol to another reaction kettle, dissolve, stir evenly, and pass protective gas nitrogen into the reaction kettle, plug in Condenser tube; at a temperature of 70°C, add acrylic acid, maleic anhydride-β-cyclodextrin-lignin solution and potassium persulfate solution dropwise; acrylic acid and maleic anhydride-β-cyclodextrin-lignin solution dropwise The adding time is 1 hour, the dropping time of the potassium persulfate solution is 4 hours, and the reaction is kept for 2 hours after the dropping is completed. After natural cooling, adjust the pH value to 7-9 with sodium hydroxide solution. Adding this product which accounts for 1.4% of the cement mass, the water reducing rate is 30%, the concrete slump reaches 21cm, the bleeding rate is 0, the slump after 1 hour is 21cm, and the 28-day compressive strength ratio is 141%.
需要说明的是，本发明的应用不限于上述的举例，对本领域普通技术人员来说，可以根据上述说明加以改进或变换，所有这些改进和变换都应属于本发明所附权利要求的保护范围。 It should be noted that the application of the present invention is not limited to the above examples, and those skilled in the art can make improvements or transformations according to the above descriptions, and all these improvements and transformations should belong to the protection scope of the appended claims of the present invention.
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