WO2023061023A1

WO2023061023A1 - Polymer cement waterproof coating and use thereof in bonding of wet-laid coiled material

Info

Publication number: WO2023061023A1
Application number: PCT/CN2022/111965
Authority: WO
Inventors: 沈恒; 殷鹏; 唐岗
Original assignee: 江苏凯伦建材股份有限公司
Priority date: 2021-10-15
Filing date: 2022-08-12
Publication date: 2023-04-20
Also published as: CN113979702B; CN113979702A

Abstract

The present invention relates to a polymer cement waterproof coating and the use thereof in the bonding of a wet-laid coiled material. The polymer cement waterproof coating comprises a component A and a component B, wherein the component A comprises, in percentages by mass, 70-90% of a polyacrylate emulsion, 10-25% of an ethylene-vinyl acetate emulsion and 0-5% of an auxiliary; and the component B comprises, in percentages by mass, 50-55% of Portland cement, 5-15% of high-alumina cement, 30-40% of a filler and 2-6% of an auxiliary. According to the present invention, by using the polymer cement waterproof coating prepared by compounding a specific compound emulsion, the Portland cement, the high-alumina cement and water in cooperation with other components, hydration film formation of the cement is achieved; the polymer cement waterproof coating can be suitable for the bonding and curing of a wet-laid coiled material, and a compact and continuous waterproof layer is formed by the polymer cement waterproof coating; in addition, the polymer cement waterproof coating has a strong adhesive force with the base layer and can be effectively bonded with the wet-laid coiled material, such that the dual functions of bonding and waterproofing are achieved.

Description

A kind of polymer cement waterproof coating and its application in the bonding of wet laying coils

technical field

The invention belongs to the technical field of waterproof coatings, and in particular relates to a polymer cement waterproof coating and its application in bonding wet-laid coils.

Background technique

The polymer self-adhesive wet paving method usually uses cement slurry or cement mortar as the bonding material in the market. The construction site cannot judge the condition of the base layer, so the selection of cement grades cannot be accurately matched, and it is prone to unreasonable configuration of cement (sand) slurry, which affects the coiled material. Effectively compound with the base layer.

JS waterproof coatings (polymer cement waterproof coatings) currently on the market are mostly used in indoor single-pass waterproofing processes. After being directly used on self-adhesive wet-laid coils, hollowing, detachment from the coil, detachment from the base layer, loss of compactness, and pores will occur. Phenomenon, not suitable for wet-laid membrane bonding. This is because: first, the polymer cement waterproof coating cannot be effectively matched with the self-adhesive adhesive layer of the coil, and cannot be combined efficiently, resulting in detachment or insufficient bonding strength; second, under the wet laying method, the transition of the polymer cement waterproof coating There is a difference in bonding between the layer and the coiled material and the cement base layer, resulting in shrinkage of the coiled material interface or the cement interface, causing hollowing and detachment; the third is that the general JS waterproof coating needs to volatilize the excess water into the air to cure, and directly wet the roll The material will be sealed by the coiled material and the water will not be cured in the JS material. Therefore, the ordinary JS waterproof coating cannot meet the effective combination function under the wet laying method, and will also lose the waterproof function of the JS coating itself.

Patent CN112341878A discloses polymer cement waterproof coating, roof waterproof layer and its preparation method. The coating includes liquid material and powder material with a mass ratio of 1:1-1.3. The liquid material composition: acrylic acid emulsion 59-88%, ethylene-vinyl acetate Copolymer emulsion 5-30%, styrene-butadiene emulsion 3-5%, defoamer 0.1-0.7% and water 1-5.5%; powder composition: cement 25-35%, quartz powder 32.5-44.5%, talcum powder 20- 30% and wollastonite 1.5-3.5%. This polymer cement waterproof coating is developed for the roof waterproof layer, and can be solidified and formed by volatilizing excess water into the atmosphere, and it is also inapplicable to the paste of wet-laid waterproof membranes.

Contents of the invention

The purpose of the present invention is to provide a polymer cement waterproof coating suitable for wet-laid coil bonding in order to overcome the deficiencies of the prior art.

The second object of the present invention is to provide the application of a polymer cement waterproof coating on the bonding of wet-laid coils.

In order to achieve the above purpose, the technical solutions adopted are:

A polymer cement waterproof coating, comprising component A and component B, in terms of mass percentage, said component A comprises 70-90% acrylate emulsion, 10-25% ethylene-vinyl acetate emulsion and 0 ~5% additives; in terms of mass percentage, the component B includes 50-55% Portland cement, 5-15% high alumina cement, 30-40% filler and 2-6% additives.

In some embodiments, the acrylate emulsion is an elastic waterproof emulsion with a solid content of 62%-65%, a Tg value below -10°C, and a self-crosslinking functional group. The acrylate emulsion can be self-crosslinked through the crosslinking functional group after film formation. Preferably, the acrylate emulsion is acrylate emulsion modified by unsaturated fatty acid. More preferably, the unsaturated fatty acid is C10-18 unsaturated fatty acid, such as C14-C18/C16-C18 unsaturated fatty acid (pentadec-2,4,6,8,10,12,14-heptanoic acid ). Specifically, such as Bardford Company, the model is the acrylate emulsion of FS360A.

In some embodiments, the ethylene-vinyl acetate emulsion is an elastic emulsion with a solid content of 55% to 60%, a Tg value below -0°C, and PVA as a protective colloid. Specifically, such as Celanese Corporation, the model is celvolit 1386H, the solid content is 55%, and the Tg value is -5°C.

According to some embodiments of the present invention, the mass ratio of the component A to the component B is 1:2.2-2.7.

According to some embodiments of the present invention, in the component A, the auxiliary agent is selected from one or a combination of defoamers, coagulants, and dispersants. Preferably, the added amount of the defoamer accounts for 0-2.5% of the total mass of the component A; the added amount of the coagulant accounts for 0-3% of the total mass of the component A; The added amount of the dispersant accounts for 0-2% of the total mass of the component A.

According to some embodiments of the present invention, the filler is quartz sand.

According to some embodiments of the present invention, in the component B, the auxiliary agent is selected from one or a combination of water reducers, coagulants, and PVA fibers. Preferably, the added amount of the water reducer accounts for 0.5-4% of the total mass of the component B; the added amount of the coagulant accounts for 0-4% of the total mass of the component B; The added amount of the PVA fiber accounts for 0.1-0.2% of the total mass of the component B.

The second technical solution adopted by the present invention is: the application of the above-mentioned polymer cement waterproof coating on the pasting of wet-laid coiled materials.

Further, when the polymer cement waterproof coating is used to paste the coiled material, the polymer cement waterproof coating is coated on the cement base layer, and then the coiled material is directly laid.

In some embodiments, the roll is a wet-laid polymer self-adhesive waterproof roll with an adhesive layer. When laying, the adhesive layer faces the polymer cement waterproof coating. Further, the adhesive layer is a hot-melt pressure-sensitive adhesive.

In the present invention, by selecting and combining materials and combining polymers of different materials, an efficient combination of the cement base layer and the adhesive layer of the coil is achieved; through the combined use of the Portland cement and high-alumina cement, the A series of problems such as impermeability and anti-gassing of the bonded composite coating under the wet laying method; and the addition of the water reducing agent and water-soluble PVA fiber further controls and reduces the water content in the coating, so that there is excessive moisture in the coating and the base layer Consumed by the cement in the paint, it further helps to solve the problems of degumming, gas crossing and water crossing caused by water vaporization.

Due to the use of the above-mentioned technical solutions, the present invention has the following advantages compared with the prior art:

In the present invention, the polymer cement waterproof coating prepared by using a specific compound emulsion, Portland cement, high alumina cement and compounding additives can realize cement hydration and film formation, and can be applied to the bonding of wet-laid coils It solidifies and forms a dense and continuous waterproof layer by itself. At the same time, it also has strong adhesion to the cement base and effectively bonds with wet-laid coils, which has dual functions of bonding and waterproofing.

The polymer cement waterproof coating of the present invention is specially designed for its free water surplus as an interlayer and the film-forming compactness of the material, and solves the problem of uncurable, coiled material swelling, and layering caused by a large amount of free water in the adhesive layer after wet laying construction. The problem of breaking away from the string of water. Moreover, the polymer cement waterproof coating of the present invention meets the index requirements of Type III in the national standard GBT23445-2009.

The polymer cement waterproof coating of the present invention has low requirements on construction base conditions, is suitable for various complex structural parts, has low material cost, and has excellent properties such as good elasticity.

Detailed ways

As introduced in the background technology, the existing JS waterproof coating is mostly used in the indoor single-pass waterproofing process. Usually, after the JS waterproof coating is applied, the water is naturally volatilized into the atmosphere, and the material can be cured into a film to form a waterproof layer. The polymer cement waterproof coating used for wet-laid coil bonding is because after the polymer cement waterproof coating is painted, the coil is laid on the top of the JS waterproof coating before the coating is dry, and it is closed by the waterproof coil. The moisture in the material cannot be volatilized into the atmosphere. Basically, it depends on the formula design of the coating itself. It is absorbed through the hydration of the cement, and the material is hydrated and solidified. The dense structure effectively bonded with the base layer and the wet-laid coil plays a waterproof role. and the dual function of paste.

Based on this, the JS waterproof coating designed by the present invention utilizes the characteristics that polymer emulsions can effectively combine inorganic and organic materials to form a structure with high bonding strength between the coating and the cement base, and between the coating and the coil; The polymer modified cement waterproof coating has good waterproof and anti-seepage ability, while forming a bonding effect, the body provides an excellent elastic waterproof structure layer. The present invention solves the shrinkage that occurs in the curing molding process of ordinary JS waterproof coatings through the combination of materials, and solves the situation of detaching from the coil or cement base; through the compound cement system, the water demand for cement hydration is adjusted, and the free water is reduced. The content of water in the coating can improve the problem of drumming and damage to the coil application caused by the evaporation of water vapor after wet laying; balance the curing speed of the material and the operation time of construction, and meet the requirements of construction operation time under the condition of low moisture content, and solve the problem of hydration Water demand and heat of hydration, improving the need for construction at low temperatures.

The technical solutions of the present invention will be described in detail below in conjunction with specific examples, so that those skilled in the art can better understand and implement the technical solutions of the present invention, but the present invention is not therefore limited to the scope of the examples.

In the following examples, the acrylic emulsion was purchased from Bardford Company, the model is FS360A, the solid content is 62%, and the Tg value is -15°C. The ethylene-vinyl acetate emulsion was purchased from Celanese Corporation, the model is celvolit 1386H, the solid content is 55%, and the Tg value is -5°C.

Example 1

The polymer cement waterproof coating provided in this embodiment is composed of component A and component B in a mass ratio of 1:2.5, wherein,

In terms of mass percentage, the component A consists of the following components:

Acrylate emulsion 83%;

Ethylene-vinyl acetate emulsion 15%;

Dispersant 2%.

In terms of mass percentage, the component B consists of the following components:

The above component A and component B were mixed according to the ratio to obtain the polymer cement waterproof coating, and the polymer cement waterproof coating film was prepared as a sample, and the test was carried out with reference to the standard GB/T23445-2009. The results are shown in Table 1.

Referring to GBT23445-2009 bonding strength test method, the polymer cement waterproof coating is coated on the hot melt adhesive layer of the polymer self-adhesive waterproof membrane, in the cement standard curing box (temperature 20 ± 1 ℃, humidity greater than 90%) After curing for 7 days, the bond strength was measured to be 1.0 MPa.

Use the Vicat consistency meter to prepare samples according to the sample preparation method of the instrument, and then seal the upper and lower sides of the sample preparation mold with glass plates. After 18 hours, the test can be finalized.

Example 2

The polymer cement waterproof coating provided in this example is composed of component A and component B in a mass ratio of 1:2.2, wherein,

Acrylic emulsion 70%;

Ethylene-vinyl acetate emulsion 25%;

Dispersant 2%;

Coagulant 2%;

Defoamer 1%.

Referring to GBT23445-2009 bonding strength test method, the polymer cement waterproof coating is coated on the hot melt adhesive layer of the polymer self-adhesive waterproof membrane, in the cement standard curing box (temperature 20 ± 1 ℃, humidity greater than 90%) After curing for 7 days, the bond strength was measured to be 1.3MPa.

The Vicat consistency meter is used to prepare samples according to the sample preparation method of the instrument, and then the upper and lower sides of the sample preparation mold are sealed with glass plates, and the test can be finalized after 24 hours.

Example 3

The polymer cement waterproof coating provided in this example is composed of component A and component B in a mass ratio of 1:2.7, wherein,

Acrylic emulsion 90%;

Ethylene-vinyl acetate emulsion 10%.

Referring to GBT23445-2009 bonding strength test method, the polymer cement waterproof coating is coated on the hot melt adhesive layer of the polymer self-adhesive waterproof membrane, in the cement standard curing box (temperature 20 ± 1 ℃, humidity greater than 90%) After curing for 7 days, the bond strength was measured to be 1.1MPa.

The Vicat consistency meter is used to prepare samples according to the sample preparation method of the instrument, and then the upper and lower sides of the sample preparation mold are sealed with glass plates, and the test can be finalized after 16 hours.

Comparative example 1

The polymer cement waterproof coating provided in this comparative example differs from Example 3 in that: high alumina cement and coagulant are not added in component B, and the composition of component B is as follows:

Mix component A and component B according to the mass ratio of 1:2.7 to obtain the polymer cement waterproof coating.

The Vicat consistency meter is used to prepare samples according to the sample preparation method of the instrument, and then the upper and lower sides of the sample preparation mold are sealed with glass plates, and it takes 10 days to finally set.

Referring to GBT23445-2009 bonding strength test method, the polymer cement waterproof coating is coated on the hot melt adhesive layer of the polymer self-adhesive waterproof membrane, in the cement standard curing box (temperature 20 ± 1 ℃, humidity greater than 90%) It will fall off during the test bonding for 7 days after curing and cannot form a strength member.

Comparative example 2

The polymer cement waterproof coating provided in this comparative example differs from Example 3 in that an excessive amount of high-alumina cement is added to component B, and the composition of component B is as follows:

Referring to GBT23445-2009 bonding strength testing method, the polymer cement waterproof coating is coated on the hot melt adhesive layer of the polymer self-adhesive waterproofing membrane, and cracking occurs 1 day after forming, so the bonding strength is not tested.

Comparative example 3

The polymer cement waterproof coating provided in this comparative example differs from Example 3 in that: water is added in component A, and the composition of component A is as follows:

Acrylic emulsion 80%;

Ethylene-vinyl acetate emulsion 10%;

Water 10%.

The Vicat consistency meter is used to prepare samples according to the sample preparation method of the instrument, and then the upper and lower sides of the sample preparation mold are sealed with glass plates, and the final setting can only be done after 15 days.

Referring to GBT23445-2009 bonding strength test method, the polymer cement waterproof coating is coated on the hot melt adhesive layer of the polymer self-adhesive waterproof membrane, in the cement standard curing box (temperature 20 ± 1 ℃, humidity greater than 90%) After 7 days of curing, it will fall off when testing the bonding and cannot form a strength member.

Comparative example 4

The polymer cement waterproof coating provided in this comparative example differs from that of Example 3 in that: the acrylate emulsion uses Bardford FS300HS with a solid content of 57%. Others are the same as embodiment 3.

The Vicat consistency meter is used to prepare samples according to the sample preparation method of the instrument, and then the sample preparation mold is sealed with a glass plate, and the final setting can only be done after 15 days.

Comparative example 5

The difference between the polymer cement waterproof coating provided in this comparative example and Example 3 is that the ethylene-vinyl acetate emulsion is non-PVA protective colloid ethylene-vinyl acetate emulsion, specifically Celanese celvolit1320.

The Vicat consistency meter is used to prepare samples according to the sample preparation method of the instrument, and then the sample preparation mold is sealed with a glass plate, and the final setting can only be done after 7 days and 10 hours.

Sample preparation of the polymer cement waterproof coating film of Comparative Examples 1 to 5, and test the elongation at break, tensile strength and bond strength of cement components with reference to the standard GB/T23445-2009, the results cannot meet the requirements of Type III indicators, As shown in Table 1.

Table 1 is the performance test result of the polymer cement waterproof coating of embodiment 1～3 and comparative example 1～5

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention shall fall within the protection scope of the present invention.

Neither the endpoints nor any values of the ranges disclosed herein are limited to such precise ranges or values, and these ranges or values are understood to include values approaching these ranges or values. For numerical ranges, between the endpoints of each range, between the endpoints of each range and individual point values, and between individual point values can be combined with each other to obtain one or more new numerical ranges, these values Ranges should be considered as specifically disclosed herein.

Claims

A polymer cement waterproof coating, comprising component A and component B, characterized in that: in terms of mass percentage, said component A comprises 70-90% acrylate emulsion, 10-25% ethylene-vinyl acetate Ester emulsion and 0-5% additives; in terms of mass percentage, the component B includes 50-55% Portland cement, 5-15% high alumina cement, 30-40% filler and 2-6% Auxiliary.
The polymer cement waterproof coating according to claim 1, characterized in that: the acrylate emulsion is an elastic waterproof emulsion with a solid content of 62% to 65%, a Tg value below -10°C, and self-crosslinking functional groups.
The polymer cement waterproof coating according to claim 2, characterized in that: the acrylate emulsion is an acrylate emulsion modified by unsaturated fatty acid.
The polymer cement waterproof coating according to claim 1, characterized in that: the ethylene-vinyl acetate emulsion is an elastic emulsion with a solid content of 55% to 60%, a Tg value below -0°C, and PVA as a protective colloid .
The polymer cement waterproof coating according to claim 1, characterized in that: the mass ratio of the component A to the component B is 1:2.2-2.7.
The polymer cement waterproof coating according to claim 1, characterized in that: in the component A, the auxiliary agent is selected from one or a combination of defoamers, coagulants, and dispersants.
The polymer cement waterproof coating according to claim 1, characterized in that: in the component B, the additive is selected from one or a combination of water reducers, coagulants, and PVA fibers.
The polymer cement waterproof coating according to claim 1, characterized in that: in the component B, the filler is quartz sand.
The application of the polymer cement waterproof coating described in any one of claims 1 to 8 in the pasting of wet-laid roll materials.
The application according to claim 9, characterized in that: the polymer cement waterproof coating is coated on the cement base, and then the coiled material is laid.