阅读说明：本技术 一种提高干粉砂浆粘接强度的微胶囊及其制备方法 (Microcapsule for improving bonding strength of dry-mixed mortar and preparation method thereof ) 是由 金小刚 窦顺珍 苏磊 于 2021-07-14 设计创作，主要内容包括：本发明涉及一种提高干粉砂浆粘接强度的微胶囊及其制备方法,所述微胶囊包括壁材和芯材,所述壁材包括氧化淀粉,所述芯材包括热塑性树脂和固化剂,所述壁材和芯材的重量比为1：1.6～2.6,所述芯材中热塑性树脂和固化剂的重量比为2.5～45：55～100,经过高速分散、高压均质、低压均质、喷雾干燥的工艺,实现了微胶囊的制备以及干燥,得到了耐潮、易分散、易流动、可再分散的微胶囊干粉料。本发明旨在提供一种能包裹高分子材料应用于干粉砂浆中,提高材料的抗压强度,用量也少的微胶囊及其制备方法。(The invention relates to a microcapsule for improving bonding strength of dry-mixed mortar and a preparation method thereof, wherein the microcapsule comprises a wall material and a core material, the wall material comprises oxidized starch, the core material comprises thermoplastic resin and a curing agent, and the weight ratio of the wall material to the core material is 1: 1.6-2.6, wherein the weight ratio of the thermoplastic resin to the curing agent in the core material is 2.5-45: 55-100, and the preparation and drying of the microcapsule are realized through the processes of high-speed dispersion, high-pressure homogenization, low-pressure homogenization and spray drying, so that the moisture-resistant, easy-to-disperse, easy-to-flow and redispersible microcapsule dry powder is obtained. The invention aims to provide a microcapsule which can wrap a high polymer material and is applied to dry powder mortar, the compressive strength of the material is improved, and the dosage is small, and a preparation method thereof.)

1. A microcapsule for improving bonding strength of dry-mixed mortar is characterized in that: the microcapsule comprises a wall material and a core material, wherein the wall material comprises oxidized starch, the core material comprises thermoplastic resin and a curing agent, and the weight ratio of the wall material to the core material is 1: 1.6-2.6, wherein the weight ratio of the thermoplastic resin to the curing agent in the core material is 2.5-45: 55 to 100.

2. The microcapsule for improving the bonding strength of the dry-mixed mortar according to claim 1, wherein: the oxidized starch is composed of one or more of cassava oxidized starch, corn oxidized starch and mung bean oxidized starch.

3. The microcapsule for improving the bonding strength of the dry-mixed mortar according to claim 1, wherein: the wall material also comprises 10-20% of octenyl succinic acid starch ester, 10-15% of Arabic gum and 10-15% of maltodextrin in percentage by weight.

4. The microcapsule for improving the bonding strength of the dry-mixed mortar according to claim 1, wherein the thermoplastic resin is one of epoxy resin, unsaturated polyester resin and polyurethane prepolymer resin.

5. The preparation method of the microcapsule for improving the bonding strength of the dry-mixed mortar according to claim 1, which is characterized by comprising the following steps: comprises the following steps of (a) carrying out,

step S1, dispersing wall materials in water at room temperature to form a liquid mixed solution, wherein the content of the oxidized starch is 15-25%;

step S2, gradually and slowly adding the mixed liquid in the step S1 into the core material under the condition of high-speed rotation, and continuously rotating and dispersing after the addition of the core material is finished;

step S3, the mixed liquid dispersed in the step S2 enters a high-pressure homogenizer, and after being homogenized for a period of time, the mixed liquid enters a low-pressure homogenizer for homogenization;

step S4, spray drying the homogenized mixed solution;

and step S5, obtaining the microcapsule dry powder material.

6. The preparation method of the microcapsule for improving the bonding strength of the dry-mixed mortar according to claim 5, which is characterized in that: in step S2, the rotation speed of the high-speed rotation is 4500-8000 r/min.

7. The preparation method of the microcapsule for improving the bonding strength of the dry-mixed mortar according to claim 5, which is characterized in that: in the step S2, the time for gradually and slowly adding the core material is 3.0-4.0 h, and the time for continuously rotating and dispersing the core material is 0.5-2.0h after the core material is added.

8. The preparation method of the microcapsule for improving the bonding strength of the dry-mixed mortar according to claim 5, which is characterized in that: in step S3, the homogenizing pressure of the high-pressure homogenizer is 28-35 MPa, the homogenizing time is 1-3.5 h, the homogenizing pressure of the low-pressure homogenizer is 2.2-3.0 MPa, and the homogenizing time is 0.5-1.5 h.

9. The preparation method of the microcapsule for improving the bonding strength of the dry-mixed mortar according to claim 5, which is characterized in that: in step S4, the liquid enters a spray dryer at the air inlet temperature of 162-175 ℃ and the flow rate of 12-14 ml/min for spray drying.

10. The application of the microcapsules for improving the bonding strength of the dry-mixed mortar according to any one of claims 1 to 4 in the field of building materials.

Technical Field

The invention relates to the technical field of microcapsules and preparation methods thereof, in particular to a microcapsule for improving the bonding strength of dry-mixed mortar and a preparation method thereof.

Background

The microcapsule technology is a technology of wrapping trace substances in a polymer film, and is a micro-packaging technology for storing solid, liquid and gas. At present, epoxy resin, unsaturated polyester and polyurethane polymers are coated more, but most of the epoxy resin, unsaturated polyester and polyurethane polymers are coated by adopting amino resin or natural rubber as a wall material, and the wall material has good mechanical strength, toughness, water resistance, acid and alkali resistance and is not suitable for application occasions for improving various properties of dry powder mortar.

The dry powder mortar is used for bonding heavy materials such as stone materials, ceramic tiles and the like and light materials such as heat insulation boards, heat insulation blocks and the like, the bonding strength, the durability and the flexibility of the dry powder mortar are important mechanical property indexes, particularly the bonding strength, if the proper bonding strength and the good durability are not available, the mortar cannot be applied to corresponding use occasions, the method for improving the bonding strength of the dry powder mortar at present mainly uses dispersible rubber powder or butylbenzene re-dispersible latex powder, although the related application technology is mature at present, the use amount is high, the cost is high, the popularization and the use are not facilitated in the application process, and the use cost is high as a user. In the use process of the inorganic cementing material, the compression strength is inevitably reduced by directly utilizing high polymer materials such as epoxy resin and the like.

Based on the current situation, microcapsules which can wrap high polymer materials and are applied to dry-mixed mortar and can avoid reduction of the compressive strength of the materials and large use amount of the materials and a preparation method thereof are urgently needed in the market at present.

Disclosure of Invention

The invention aims to provide a microcapsule which can wrap a high polymer material and is applied to dry powder mortar, the compressive strength of the material is improved, and the dosage is small, and a preparation method thereof.

The technical purpose of the invention is realized by the following technical scheme: the microcapsule for improving the bonding strength of the dry-mixed mortar comprises a wall material and a core material, wherein the wall material comprises oxidized starch, the core material comprises thermoplastic resin and a curing agent, and the weight ratio of the wall material to the core material is 1: 1.6-2.6, wherein the weight ratio of the thermoplastic resin to the curing agent in the core material is 55-100: 2.5 to 45.

By adopting the technical scheme, the wall material of the microcapsule prepared by the oxidized starch wraps the core material consisting of the thermoplastic resin and the curing agent. Oxidized starch is generally used in the food and cosmetic industries, and is also used as a material for improving adhesiveness or a functional material for flame retardance, water resistance and the like even when used in cement building materials, and the thermoplastic resin and the curing agent are mostly wrapped by a wall material with high mechanical strength and acid and alkali resistance. The oxidized starch adopted in the invention is used as the wall material, on one hand, the oxidized starch does not cause pollution in the production process of the dry powder mortar, on the other hand, the wall material made of the oxidized starch can be decomposed and broken under the alkaline condition, the core material in the microcapsule can be released, the thermoplastic resin and the curing agent are synchronously cured with the cementing material in the dry powder mortar, and finally the mortar material with the reinforced adhesive property of the high polymer material is formed.

As a further arrangement of the invention, the oxidized starch is composed of one or more of cassava oxidized starch, corn oxidized starch and mung bean oxidized starch.

By adopting the technical scheme, the raw materials for preparing the oxidized starch can be corn starch, cassava starch, sweet potato starch, wheat starch, water chestnut starch, lotus root starch and the like, but the starch with mixed straight chains and branched chains is preferably selected for cost and coating effect, and the cassava starch, the corn starch and the mung bean starch are optimally selected for preparing the oxidized starch.

As a further arrangement of the invention, the wall material also comprises 10-20% of octenyl succinic acid starch ester, 10-15% of Arabic gum and 10-15% of maltodextrin in percentage by weight.

By adopting the technical scheme, the mixture is an auxiliary material prepared from the microcapsule wall material, and can better assist the dispersion and the formation of each component in a microcapsule preparation system. The material of the microcapsule wall material can be one or more oxidized starch, or a mixture of one or more oxidized starch and natural surfactants such as gum arabic and alkenyl succinic acid starch ester.

According to a further configuration of the present invention, the thermoplastic resin is one of an epoxy resin, an unsaturated polyester resin, and a polyurethane prepolymer resin.

As a further arrangement of the invention, the preparation method of the microcapsule for improving the bonding strength of the dry-mixed mortar comprises the following steps,

step S1, dispersing wall materials in water at room temperature to form a liquid mixed solution, wherein the content of the oxidized starch is 15-25%;

step S2, gradually and slowly adding the mixed liquid in the step S1 into the core material under the condition of high-speed rotation, and continuously rotating and dispersing after the addition of the core material is finished;

step S3, the mixed liquid dispersed in the step S2 enters a high-pressure homogenizer, and after being homogenized for a period of time, the mixed liquid enters a low-pressure homogenizer for homogenization;

step S4, spray drying the homogenized mixed solution;

and step S5, obtaining the microcapsule dry powder material.

By adopting the technical scheme, the preparation and drying of the microcapsule are realized by the processes of high-speed dispersion, high-pressure homogenization, low-pressure homogenization and spray drying, the moisture-resistant, easy-to-disperse, easy-to-flow and redispersible microcapsule dry powder material is obtained, and the microcapsule dry powder material has the characteristics and advantages of simple production process, low cost, outstanding application effect, wide application range and the like.

As a further arrangement of the present invention, in step S2, the rotation speed of the high-speed rotation is 4500-8000 r/min.

By adopting the technical scheme, the rotating speed can be 600-25000 r/min, preferably 4500-8000 r/min, the dispersing effect is good, and the requirement on equipment is not high.

As a further arrangement of the invention, in the step S2, the time for gradually and slowly adding the core material is 3.0-4.0 h, and the time for continuously rotating and dispersing the core material after the core material is added is 0.5-2.0 h.

By adopting the technical scheme, the time for gradually and slowly adding the core material is 2.0-6.0 h, the time for continuously rotating and dispersing the core material after the core material is added is 0-2.5 h, preferably 3.0-4.0 h, and the time for continuously rotating and dispersing the core material after the core material is added is 0.5-2.0 h.

In step S3, the homogenizing pressure of the high-pressure homogenizer is 28-35 MPa, the homogenizing time is 1-3.5 h, the homogenizing pressure of the low-pressure homogenizer is 2.2-3.0 MPa, and the homogenizing time is 0.5-1.5 h.

By adopting the technical scheme, the high-pressure homogenizing pressure is 20-45 MPa, the low-pressure homogenizing pressure is 1.0-5.0 MPa, good homogenization can be realized, preferably, the high-pressure homogenizing pressure is 28-35 MPa, the low-pressure homogenizing pressure is 2.2-3.0 MPa, and the homogenizing efficiency and the homogenizing effect are better under the condition.

According to the further arrangement of the invention, in step S4, the liquid enters a spray dryer at a flow rate of 12-14 ml/min for spray drying under the condition that the temperature of the inlet air is 162-175 ℃.

By adopting the technical scheme, the air inlet temperature of spray drying can be dried at 120-220 ℃, preferably at 162-175 ℃, and the feeding flow rate can be dried at 8-30 ml/min, preferably at 12-14 ml/min.

As a further arrangement of the invention, the microcapsule for improving the bonding strength of the dry-mixed mortar is applied to the field of building materials.

By adopting the technical scheme, the thermoplastic resin microencapsulated by the oxidized starch and the curing agent dry powder are used in a dry powder mortar system, so that the compression strength, the breaking strength and the impact strength of the dry powder mortar can be greatly improved; when the material is used in a terrace system, the wear resistance and the sliding resistance can be greatly improved, the construction complexity can be greatly reduced, the flow is simplified, the efficiency is improved, and the cost is reduced; when the adhesive is used for a composite board system, the adhesive strength among various materials and the cohesion of the board can be greatly improved, and the physical and mechanical properties in the forming process and after forming as well as the durability of water resistance, moisture resistance, acid and alkali resistance and the like are improved; the inorganic extrusion plate is used for an inorganic extrusion plate system, the cohesive force is greatly improved, the processability of barren materials can be greatly improved, the extrusion pressure is reduced, the surface performance of the extrusion plate is improved, and the bending strength and the impact resistance of the formed plate are improved.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention provides a microcapsule for improving bonding strength of dry powder mortar and a preparation method thereof. The polymer auxiliary agent is microencapsulated thermoplastic resin and a curing agent, the wall material of the microcapsule is decomposed and broken under alkaline conditions, the thermoplastic resin and the curing agent are synchronously cured with a cementing material in dry powder mortar, and finally the mortar material with the bonding performance enhanced by the polymer material is formed. Has certain waterproof and anti-permeability functions, and does not release harmful gases and substances. Green, environment-friendly, low-carbon and healthy.

2. The invention provides a microcapsule for improving bonding strength of dry powder mortar and a preparation method thereof, the implementation of the technical scheme of the invention is realized by using a microcapsule technology, a microcapsule core material comprises two parts, one part is thermoplastic resin, the other part is a curing agent of the resin, the curing in a water-based system is realized by the decomposition and the rupture of the microcapsule in the mortar forming process, and the enrichment of a bonding interface is realized by the promotion of the surface energy difference of a part of high polymer materials, thereby achieving the purpose of improving the bonding strength; the solidification of a part of high polymer materials and the coagulation and solidification of the cementing materials are carried out synchronously, and an interpenetrating network structure is formed, so that the compression strength, the breaking strength and the impact strength of the mortar are improved, and the durability of the mortar is further improved; the condensate formed by the high molecular material fills the tiny holes formed in the molding of the cementing material, and the water-resistant and anti-permeability performance is improved. The invention is a brand new technical scheme implemented based on improvement of the current application state, and the technical scheme firstly solves the problem that the compressive strength of a high polymer material is inevitably reduced in the use process of an inorganic cementing material, secondly solves the problem of the use amount of the high polymer material in dry powder mortar, and finally solves the coordination problem of improving the bonding strength, durability and flexibility of the dry powder mortar.

3. According to the microcapsule for improving the bonding strength of the dry powder mortar and the preparation method thereof, the preparation and drying of the microcapsule are realized through the processes of high-speed dispersion, high-pressure homogenization, low-pressure homogenization and spray drying in the implementation process, and the microcapsule dry powder material which is moisture-resistant, easy to disperse, easy to flow and redispersible is obtained, and has the characteristics and advantages of simple production process, low cost, outstanding application effect, wide application range and the like.

4. According to the microcapsule for improving the bonding strength of the dry powder mortar and the preparation method thereof, the main material and the auxiliary agent used in the production process are starch materials, so that no adverse effect is generated on the product in the application process, no toxic and harmful gas and substance are generated and released in the use process, the formed product is fireproof and impervious, and no potential hazards such as variation, toxic gas generation and the like harmful to safety are generated in a high-temperature environment.

Detailed Description

The technical solutions in the examples will be clearly and completely described below. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

Example 1, using tapioca oxidized starch, the amounts of tapioca oxidized starch 60%, octenyl succinic acid ester 15%, gum arabic 10%, and maltodextrin 15%, as the wall material mixture ratio, the core material was epoxy resin E-51, the curing agent was 593 (addition product of diethylenetriamine and butyl glycidyl ether), and the weight ratio of the curing agent to the epoxy resin was 22: 100, respectively; the weight ratio of the wall material to the core material is 1: 2.4; the epoxy resin microcapsule and the curing agent microcapsule are respectively prepared according to the above proportion, and the preparation process is as follows: firstly, dispersing wall materials in water to prepare a dispersion system with the oxidized starch content of 20%, then gradually adding core materials at room temperature and the rotation speed of 6500r/min for 3.5 hours, continuously dispersing for 1.5 hours after the core materials are added, and then feeding the core materials into a high-pressure homogenizer with the homogenizing pressure of 34MPa and the homogenizing time of 1 hour; and then feeding the mixture into a low-pressure homogenizer, homogenizing for 0.5h under the condition of 2.5MPa of the low-pressure homogenizer, and then discharging the mixture to obtain the microcapsule Yuan-Yuan dispersion liquid of the epoxy resin and the curing agent respectively, feeding the dispersion liquid into a spray dryer at the air inlet temperature of 168 ℃ at the flow rate of 13ml/min for spray drying, and finally obtaining the microcapsule dry powder material which accords with the reasonable proportion of the epoxy resin and the curing agent. The detection shows that the coating rate of the epoxy resin microcapsule is 81.2 percent, the coating rate of the curing agent microcapsule is 73.6 percent, and the coating rate is properly adjusted before spray drying so as to ensure the reasonable proportion of the microcapsule dry powder of the ring resin and the ring agent.

Example 2, a mixture of tapioca oxidized starch and corn oxidized starch was used, the amounts of the mixed starch were 55%, 20% octenyl succinate starch, 15% gum arabic, and 10% maltodextrin, respectively, and the wall materials were used, the core material was epoxy resin E-51, the curing agent was curing agent 3800 (polythiol epoxy curing agent), and the weight ratio of the curing agent to the epoxy resin was 3: 100, respectively; the weight ratio of the wall material to the core material is 1: 1.8; the epoxy resin microcapsule and the curing agent microcapsule are respectively prepared according to the above proportion, and the preparation process is as follows: firstly, dispersing wall materials in water to prepare a dispersion system with the content of oxidized starch being 18%, then gradually adding core materials at the room temperature and the rotating speed of 4500r/min for 3 hours, continuously dispersing for 0.5 hour after the core materials are added, and then entering a high-pressure homogenizer with the homogenizing pressure of 32MPa and the homogenizing time of 1 hour; and then, feeding the mixture into a low-pressure homogenizer, homogenizing for 1h under the condition of 3.0MPa of the low-pressure homogenizer, then discharging the mixture to obtain microcapsule dispersion liquid of the epoxy resin and the curing agent respectively, feeding the dispersion liquid into a spray dryer at the air inlet temperature of 162 ℃ at the flow rate of 11ml/min for spray drying, and finally obtaining the microcapsule dry powder which meets the reasonable proportion of the epoxy resin and the curing agent. The detection shows that the coating rate of the epoxy resin microcapsule is 79.5 percent, the coating rate of the curing agent microcapsule is 84.1 percent, and the coating rate is properly adjusted before spray drying so as to ensure the reasonable proportion of the epoxy resin and the curing agent microcapsule dry powder.

Example 3, using tapioca oxidized starch, the amounts of tapioca oxidized starch 60%, octenyl succinate 15%, gum arabic 10%, and maltodextrin 15% as the wall material ratio, the core material was selected from unsaturated polyester resin 191, the curing agent was curing agent V388 (aksonnobel), the weight ratio of the curing agent to the epoxy resin was 2.5: 100, respectively; the weight ratio of the wall material to the core material is 1: 2.6; the unsaturated polyester resin microcapsule and the curing agent microcapsule are respectively prepared according to the above proportion, and the preparation process is as follows: firstly, dispersing wall materials in water to prepare a dispersion system with the oxidized starch content of 22%, then gradually adding core materials at room temperature and the rotating speed of 8000r/min for 3 hours, continuously dispersing for 2 hours after the core materials are added, and then entering a high-pressure homogenizer with the homogenizing pressure of 32MPa and the homogenizing time of 2 hours; and then feeding the mixture into a low-pressure homogenizer, homogenizing the mixture for 0.5h under the condition of 3MPa of the low-pressure homogenizer, then discharging the mixture to obtain microcapsule dispersion liquid of the unsaturated polyester resin and the curing agent respectively, feeding the dispersion liquid into a spray dryer at the air inlet temperature of 168 ℃ at the flow rate of 13ml/min for spray drying, and finally obtaining microcapsule dry powder according with the reasonable proportion of the unsaturated polyester resin and the curing agent. The detection shows that the coating rate of the unsaturated polyester resin microcapsule is 83.5 percent, the coating rate of the curing agent microcapsule is 76.1 percent, and the coating rate is properly adjusted before spray drying according to the coating rate so as to ensure the reasonable proportion of the unsaturated polyester resin and the curing agent microcapsule dry powder.

Example 4, using corn oxidized starch, 58% of corn oxidized starch, 12% of starch octenyl succinate, 15% of gum arabic, and 15% of maltodextrin as the wall material ratio, the core material was polyurethane prepolymer NE434(DOW), the curing agent was curing agent F-70 (blocked isovalerate curing agent), and the ratio of the curing agent to the polyurethane prepolymer was 35: 65; the weight ratio of the capsule material to the core material is 1: 1.6; feeding materials according to the proportion, and respectively preparing polyurethane prepolymer microcapsules and curing agent microcapsules, wherein the preparation process comprises the following steps: firstly, dispersing wall materials in water to prepare a dispersion system with the oxidized starch content of 15%, then gradually adding core materials at the room temperature and the rotating speed of 5000r/min for 4 hours, continuously dispersing for 1 hour after the core materials are added, and then entering a high-pressure homogenizer with the homogenizing pressure of 35MPa and the homogenizing time of 2.5 hours; and then, feeding the mixture into a low-pressure homogenizer, homogenizing for 1.5h under the condition of 2.6MPa of the low-pressure homogenizer, discharging the mixture to obtain microcapsule dispersion liquid of the polyurethane prepolymer and the curing agent respectively, feeding the dispersion liquid into a spray dryer at the air inlet temperature of 175 ℃ at the flow rate of 14ml/min for spray drying, and finally obtaining the microcapsule dry powder which meets the reasonable proportion of the epoxy resin and the curing agent. The detection shows that the coating rate of the polyurethane prepolymer microcapsule is 63.5 percent, the coating rate of the plasticizer microcapsule is 62.1 percent, and the proper adjustment is carried out according to the coating rate before the spray drying, so as to ensure the reasonable proportion of the microcapsule dry powder of the polyurethane prepolymer and the curing agent.

Example 5, using mung bean oxidized starch, 65% of mung bean oxidized starch, 10% of octenyl succinate, 15% of gum arabic, and 10% of maltodextrin as the wall material mixture ratio, selecting a polyurethane prepolymer W5700 (long-chain flexible prepolymer) as the core material, 0-9800 (end-capped isovalerate curing agent) as the curing agent, and 45% of the curing agent and the polyurethane prepolymer: 55; the weight ratio of the capsule material to the core material is 1: 1.8; the materials are fed according to the proportion to respectively prepare the polyester prepolymer microcapsule and the curing agent microcapsule, and the preparation process is as follows: firstly, dispersing wall materials in water to prepare a dispersion system with the content of oxidized starch of 25%, then gradually adding core materials at room temperature and the rotating speed of 6000r/min for 3 hours, continuously dispersing for 1.5 hours after the core materials are added, and then feeding the core materials into a high-pressure homogenizer with the homogenizing pressure of 28MPa and the homogenizing time of 3.5 hours; and then, feeding the mixture into a low-pressure homogenizer, homogenizing for 1.5h under the condition of 2.2MPa of the low-pressure homogenizer, discharging the mixture to obtain microcapsule dispersion liquid of the polyurethane prepolymer and the curing agent respectively, feeding the dispersion liquid into a spray dryer at the air inlet temperature of 165 ℃ at the flow rate of 12ml/min for spray drying, and finally obtaining the microcapsule dry powder which meets the reasonable proportion of the polyurethane prepolymer and the curing agent. The detection shows that the coating rate of the polyurethane prepolymer microcapsule is 73.5 percent, the coating rate of the curing agent microcapsule is 76.1 percent, and the proper adjustment is carried out according to the coating rate before the spray drying so as to ensure the reasonable proportion of the polyurethane prepolymer and the curing agent microcapsule dry powder.

Application example description:

table 1 test results of examples applied to mortar

(mortar mixing ratio: Huaxin P.O42.5 cement 300kg tailing sand 700kg microcapsule dry powder 5kg, water cement ratio 0.4)

Reference to the recommended standards of the American society for concrete (ACI)544 Committee

Bump milling of 2 reference los Angeles

3 referential JC/T984-2011 Polymer Cement waterproof mortar

Reference JC/T1050-2007 grade division and test method for ground stone anti-skid performance

Reference standard JC/T230-2007 premixed mortar for 28d compressive strength, 28d flexural strength and 28d bonding strength

As can be seen from the above table, the addition of the microcapsule dry powder remarkably improves the bonding strength and the impact strength of the dry powder mortar, and also partially improves the compressive strength and the flexural strength of the mortar, and different polymer and curing agent ratios obtain products capable of improving the mortar performance in different aspects.