阅读说明：本技术 一种防水砂浆乳液及其制备方法 (Waterproof mortar emulsion and preparation method thereof ) 是由 吕书人 于 2020-05-26 设计创作，主要内容包括：本发明涉及一种防水砂浆乳液,按照重量份数计,该防水砂浆乳液的原料具体包括如下组分：苯丙乳液100-120份、重钙10-20份、偏高岭土5-10份、减水剂5-10份、羟乙基纤维素1-5份、聚丙烯酰胺1-5份、杀菌剂0.5-2.5份、消泡剂0.5-2.5份、水120-150份。本发明中,聚丙烯酰胺与溶液中的Ca<Sup>2+</Sup>相互配合作用,导致生成粘稠的凝胶,从胶粒状颗粒到均匀橡胶状固体,橡胶状固体密实填充于防水砂浆的空隙中,起到柔性填充和柔性加筋的作用,改善了防水砂浆乳液硬化后的物理组织结构,缓解了内应力,减少微裂纹的产生,从而增强了防水砂浆的致密性、柔韧性、抗渗性、粘结强度和抗折强度。(The invention relates to a waterproof mortar emulsion which comprises the following raw materials in parts by weight: 100-120 parts of styrene-acrylic emulsion, 10-20 parts of heavy calcium carbonate, 5-10 parts of metakaolin, 5-10 parts of water reducing agent, 1-5 parts of hydroxyethyl cellulose, 1-5 parts of polyacrylamide, 0.5-2.5 parts of bactericide, 0.5-2.5 parts of defoaming agent and 150 parts of water. In the present invention, polyacrylamide and Ca in solution 2+ The mutual cooperation results in generating viscous gel, and from colloidal particles to even rubber-like solid, the rubber-like solid is compactly filled in the gap of the waterproof mortar, so that the flexible filling and flexible reinforcement effects are achieved, the physical organization structure of the hardened waterproof mortar emulsion is improved, and the problem of low strength of the waterproof mortar emulsion is solvedThe internal stress reduces the generation of microcracks, thereby enhancing the compactness, the flexibility, the impermeability, the bonding strength and the breaking strength of the waterproof mortar.)

1. The waterproof mortar emulsion is characterized in that: the waterproof mortar emulsion comprises the following raw materials in parts by weight: 100-120 parts of styrene-acrylic emulsion, 10-20 parts of heavy calcium carbonate, 5-10 parts of metakaolin, 5-10 parts of water reducing agent, 1-5 parts of hydroxyethyl cellulose, 1-5 parts of polyacrylamide, 0.5-2.5 parts of bactericide, 0.5-2.5 parts of defoaming agent and 150 parts of water.

2. The waterproof mortar emulsion according to claim 1, wherein: the metakaolin is modified metakaolin, and the modification method of the modified metakaolin comprises the following steps: weighing 15-30 parts of metakaolin according to parts by weight, adding the metakaolin into a dispersion machine, and mixing the metakaolin with a modifier M in a mass ratio of: m metakaolin = 0.005: 1 adding a modifier, and then adjusting the rotating speed of a dispersion machine to 750-800r/min to disperse the metakaolin for 15-20 min.

3. The waterproof mortar emulsion according to claim 2, wherein: the modifier is one of diethylamine, diethanolamine, dodecylamine or octadecylamine.

4. The waterproof mortar emulsion according to claim 2, wherein: the raw materials of the waterproof mortar emulsion also comprise 5-10 parts of silica fume.

5. The waterproof mortar emulsion according to claim 2, wherein: the water reducing agent is a naphthalene water reducing agent.

6. The waterproof mortar emulsion according to claim 2, wherein: the fineness of the coarse whiting is 325 meshes.

7. The waterproof mortar emulsion according to claim 2, wherein: the bactericide is one of 1, 2-benzisothiazolin-3-one, 2-methyl-4-isothiazolin-3-one or 5-chloro-2-methyl-4-isothiazolin-3-one.

8. The waterproof mortar emulsion according to claim 2, wherein: the defoaming agent is one of polydimethylsiloxane, fluorosilicone or ethylene glycol siloxane.

9. A method for preparing a waterproof mortar emulsion according to any one of claims 1 to 8, characterized in that: the preparation method comprises the following steps:

(1) weighing 1/3 and hydroxyethyl cellulose in proportion, adding the 1/3 and the hydroxyethyl cellulose into a stirring pool A, uniformly stirring at a rotating speed of 200r/min at a temperature lower than 20 ℃, then weighing 1/2 in proportion and adding the weighed mixture into the stirring pool to continue stirring until the mixed solution is uniformly stirred to obtain a mixed solution A for later use;

(2) weighing the heavy calcium, the rest water and the rest polyacrylamide according to the proportion, adding the heavy calcium, the rest water and the rest polyacrylamide into a stirring pool B, and uniformly stirring at the rotating speed of 150-;

(3) weighing the rest raw materials in proportion, adding the raw materials into a stirring tank C, then adding the mixed solution A and the mixed solution B into the stirring tank C, and uniformly stirring at the rotating speed of 900-1000r/min to obtain the waterproof mortar emulsion.

Technical Field

The invention relates to the technical field of mortar, in particular to waterproof mortar emulsion and a preparation method thereof.

Background

The waterproof mortar is also called as a cation neoprene waterproof and anticorrosive material, and the cation neoprene is a high polymer molecule modified base high polymer waterproof and anticorrosive system. The high polymer latex is prepared by introducing imported epoxy resin modified latex, adding domestic chloroprene rubber latex and polyacrylate, synthesizing rubber, various emulsifiers, modified latex and the like.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the waterproof mortar emulsion which has the advantages of good compactness, high waterproof performance and the like.

The above object of the present invention is achieved by the following technical solutions: the waterproof mortar emulsion comprises the following raw materials in parts by weight: 100-120 parts of styrene-acrylic emulsion, 10-20 parts of heavy calcium carbonate, 5-10 parts of metakaolin, 5-10 parts of water reducing agent, 1-5 parts of hydroxyethyl cellulose, 1-5 parts of polyacrylamide, 0.5-2.5 parts of bactericide, 0.5-2.5 parts of defoaming agent and 150 parts of water.

By adopting the technical scheme, the metakaolin has the activity of volcanic ash, reacts with water and heavy calcium carbonate, and the generated secondary hydration product can fill the pores of the slurry and block capillary channels, so that the impermeability of the waterproof mortar after being hardened is improved. Polyacrylamide and Ca in solution²⁺The mutual cooperation effect generates viscous gel, from colloidal particle to even rubber-like solid, the rubber-like solid is compactly filled in the gap of the waterproof mortar, the flexible filling and flexible reinforcement effects are achieved, the physical organization structure of the waterproof mortar emulsion after hardening is improved, the internal stress is relieved, the generation of microcracks is reduced, and the compactness and the impermeability of the waterproof mortar are enhanced. When the hydroxyethyl cellulose is dissolved in water, the carboxyl on the long chain and the oxygen atom on the ether bond are associated with water molecules to form hydrogen bonds, so that the water loses fluidity, the solution becomes thick, the thickening and water retaining effect is generated on the mortar, and the improvement of the water seepage prevention effect of the waterproof mortar emulsion is facilitated. In addition, the polyacrylamide and the hydroxyethyl cellulose are mixed, the long molecular main chain and the side chain are utilized to play the roles of adsorption and bridge in the slurry, and the components of the mortar are bound together through the mutual lap joint of the molecular chains to form a net structure, so that the waterproof mortar solution is not easy to disperse, and the impermeability of the mortar after molding is favorably enhanced. The coarse whiting has the advantages of no toxicity, no smell, soft quality, good dispersibility, low price and the like, is added into styrene-acrylic emulsion and used for preparing waterproof mortar emulsion, is beneficial to reducing the production cost and enhancing the toughness and strength of the product.

The present invention in a preferred example may be further configured to: the metakaolin is modified metakaolin, and the modification method of the modified metakaolin comprises the following steps: weighing 15-30 parts of metakaolin according to parts by weight, adding the metakaolin into a dispersion machine, and mixing the metakaolin with a modifier M in a mass ratio of: m metakaolin = 0.005: 1 adding a modifier, and then adjusting the rotating speed of a dispersion machine to 750-800r/min to disperse the metakaolin for 15-20 min.

By adopting the technical scheme, the metakaolin is modified by adopting the modifier, and the active Al in the metakaolin is modified₂O₃•2SiO₂The components react with calcium ions in the system and generate fine gel and other products, so that gaps in the waterproof mortar emulsion are reduced, and the waterproof and anti-permeability performance of the waterproof mortar emulsion after curing is enhanced.

The present invention in a preferred example may be further configured to: the modifier is one of diethylamine, diethanolamine, dodecylamine or octadecylamine.

By adopting the technical scheme, the diethylamine, the diethanolamine, the dodecylamine and the octadecylamine are all organic amines, and polar groups (amino groups) in organic amine molecules react with the surfaces of metakaolin particles through chemical adsorption and physical adsorption, so that the metakaolin is modified, the hydrophobicity of the modified metakaolin is enhanced, and the waterproof performance of the waterproof mortar is improved.

The present invention in a preferred example may be further configured to: the waterproof mortar emulsion also comprises 5-10 parts of silica fume.

By adopting the technical scheme, the silica fume has large specific surface area and thickening and water-retaining effects, and the silica fume, the polyacrylamide and the carboxyethyl cellulose are mixed, so that the water-dispersion resistance of the waterproof mortar emulsion is favorably improved. With the addition of the silica fume, the pores in the waterproof mortar system are filled, a good physical filling effect is exerted, and in addition, under the action of the heavy calcium, the silica fume can react in water to generate gel substances and continuously fill the pores, so that the waterproof performance of the mortar is further enhanced.

The present invention in a preferred example may be further configured to: the water reducing agent is a naphthalene water reducing agent.

By adopting the technical scheme, the naphthalene water reducer is a preferable material for preparing the waterproof mortar with low mortar consumption, good workability and strong durability, and the naphthalene water reducer is selected as the water reducer for preparing the waterproof mortar emulsion, so that the durability and workability of the waterproof mortar emulsion are improved.

The present invention in a preferred example may be further configured to: the fineness of the coarse whiting is 325 meshes.

By adopting the technical scheme, the mesh number of the coarse whiting is 325 meshes, and the coarse whiting is used for producing the waterproof mortar emulsion, so that the production cost can be reduced, and the toughness and hardness of a product obtained by solidifying the mortar emulsion can be increased.

The present invention in a preferred example may be further configured to: the bactericide is one of 1, 2-benzisothiazolin-3-one, 2-methyl-4-isothiazolin-3-one or 5-chloro-2-methyl-4-isothiazolin-3-one.

By adopting the technical scheme, the 1, 2-benzisothiazolin-3-one, the 2-methyl-4-isothiazoline-3-one and the 5-chloro-2-methyl-4-isothiazoline-3-one are isothiazolinone bactericides which have extremely strong penetrating power on receptor cell membranes and cell walls, and can interact with protein and simple enzyme activity molecules containing sulfhydryl (S-H) components in cells after penetrating the peripheries of the cells to break sulfhydryl bonds and form S-S bonds with receptors, so that the normal functions of the cells are destroyed, and the isothiazolinone bactericides are used for preparing the waterproof mortar emulsion to enhance the antiseptic and antibacterial performance of the waterproof mortar emulsion.

The present invention in a preferred example may be further configured to: the defoaming agent is one of polydimethylsiloxane, fluorosilicone or ethylene glycol siloxane.

By adopting the technical scheme, the defoaming agent is added into the raw material of the waterproof mortar, so that bubbles in the production process of the waterproof mortar emulsion are reduced, and the compactness and strength of the mortar emulsion are enhanced.

The second aim of the invention is realized by the following technical scheme: a preparation method of waterproof mortar emulsion comprises the following steps:

(1) weighing 1/3 and hydroxyethyl cellulose in proportion, adding the 1/3 and the hydroxyethyl cellulose into a stirring pool A, uniformly stirring at a rotating speed of 200r/min at a temperature lower than 20 ℃, then weighing 1/2 in proportion and adding the weighed mixture into the stirring pool to continue stirring until the mixed solution is uniformly stirred to obtain a mixed solution A for later use;

(2) weighing the heavy calcium, the rest water and the rest polyacrylamide according to the proportion, adding the heavy calcium, the rest water and the rest polyacrylamide into a stirring pool B, and uniformly stirring at the rotating speed of 150-;

(3) weighing the rest raw materials in proportion, adding the raw materials into a stirring tank C, then adding the mixed solution A and the mixed solution B into the stirring tank C, and uniformly stirring at the rotating speed of 900-1000r/min to obtain the waterproof mortar emulsion.

By adopting the technical scheme, the hydroxyethyl cellulose has higher solubility in cold water below 20 ℃, and carboxyl on a long chain of the hydroxyethyl cellulose and oxygen atoms on ether bonds are more easily associated with water molecules to form hydrogen bonds, so that the thickening and water retention effects of the mortar are enhanced. The hydroxyethyl cellulose and the polyacrylamide are added into water together and stirred into mixed liquid, so that the hydroxyethyl cellulose and the polyacrylamide are favorably matched, and the compressive strength and the impermeability of the waterproof mortar emulsion are enhanced. Adding the heavy calcium, the polyacrylamide and the water into the stirring tank together so that the polyacrylamide and the Ca in the solution²⁺And the gel is mutually matched to generate viscous gel, which is beneficial to enhancing the compactness, impermeability and breaking strength of a waterproof mortar system.

In summary, the invention includes at least one of the following beneficial technical effects:

1. in the invention, the metakaolin has the activity of volcanic ash, and reacts with water and heavy calcium carbonate to generate a secondary hydration product which can fill pores of the slurry and block capillary channels, so that the impermeability of the waterproof mortar after being hardened is improved. Polyacrylamide and Ca in solution²⁺The mutual cooperation generates viscous gel, from colloidal particle to even rubber-like solid, the rubber-like solid is compactly filled in the gap of the waterproof mortar, the flexible filling and flexible reinforcement effects are achieved, the physical organization structure of the waterproof mortar emulsion after hardening is improved, the internal stress is relieved,the generation of micro cracks is reduced, so that the compactness and the impermeability of the waterproof mortar are enhanced. In addition, the polyacrylamide and the hydroxyethyl cellulose are mixed, the long molecular main chain and the side chain are utilized to play the roles of adsorption and bridge in the slurry, and the components of the mortar are bound together through the mutual lap joint of the molecular chains to form a net structure, so that the waterproof mortar solution is not easy to disperse, and the impermeability of the mortar after molding is favorably enhanced;

2. in the invention, the metakaolin is modified by adopting a modifier, and active Al in the metakaolin is modified₂O₃•2SiO₂The components react with calcium ions in the system and generate fine gel and other products, so that gaps in the waterproof mortar emulsion are reduced, and the waterproof and anti-permeability performance of the waterproof mortar emulsion after curing is enhanced;

3. according to the invention, the silica fume has a large specific surface area and has a thickening and water-retaining effect, and the silica fume, polyacrylamide and carboxyethyl cellulose are mixed, so that the water-resistant dispersion performance of the waterproof mortar emulsion is improved. With the addition of the silica fume, the pores in the waterproof mortar system are filled, a good physical filling effect is exerted, and in addition, under the action of the heavy calcium, the silica fume can react in water to generate gel substances and continuously fill the pores, so that the waterproof performance of the mortar is further enhanced.

Detailed Description

The present invention will be described in further detail with reference to examples.