CN110922820A - Decorative veneer interface agent and preparation method thereof - Google Patents
Decorative veneer interface agent and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
- C09D125/02—Homopolymers or copolymers of hydrocarbons
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- C09D125/14—Copolymers of styrene with unsaturated esters
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/14—Paints containing biocides, e.g. fungicides, insecticides or pesticides
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Abstract
The invention relates to a decorative veneer interface agent and a preparation method thereof, wherein the decorative veneer interface agent comprises the following components: water, cellulose, a wetting agent, a defoaming agent, an emulsion and a pH regulator, wherein the mass proportions of the cellulose, the wetting agent, the defoaming agent, the emulsion and the pH regulator are 3-5 thousandths, 1-2 thousandths, 0.5-1.5 thousandths, 490-doped 510 thousandths and 0.4-0.6 thousandths respectively. The invention overcomes the defects that the back surface of the coating substrate of the existing decorative veneer is not subjected to any coating treatment, the water content is low, the water absorption rate is high, the bonding mortar is dehydrated in a short time when the back surface is contacted with the bonding mortar during construction, the tensile bonding strength of the bonding mortar is reduced, and the bonding mortar and the coating substrate are not firmly bonded.
Description
Technical Field
The invention relates to a decorative veneer interface agent and a preparation method thereof, which are applied to the field of decorative veneer production.
Background
At present, most of decorative veneers on the market are outer wall decorative materials which are prepared by using asbestos-free calcium silicate boards, fiber reinforced cement flat plates and the like as coating substrates, performing fixed-thickness sanding on the front surfaces of the decorative veneers in a factory, performing coating procedures of roller coating of priming paint, background colored paint, spraying of finish paint and roller coating of finish paint on the front surfaces of the decorative veneers, and drying the back surfaces of the decorative veneers on a production line. The construction does not need any treatment, and the installation is directly carried out by adopting a mode of mainly binding mortar and secondarily anchoring a metal anchoring piece.
The coating substrate of the decorative veneer is required to be steamed and dried in the production and manufacturing process to control the water content of the coating substrate to be below 10% so as to meet the coating requirement, and the back surface of the coating substrate is not subjected to any pretreatment in the production and processing process of the coating substrate and is dried again, so that the water content of the coating substrate is lower, the water absorption rate is higher (about 28%), the bonding mortar can lose water in a short time after contacting with the back surface of the coating substrate in construction, the tensile bonding strength of the bonding mortar is reduced, and finally the bonding of the coating substrate and the bonding mortar is not firm. And if the back of the coated substrate is not pretreated, the coated substrate absorbs water and moisture in the construction or use process in cold regions, and the phenomena of pulverization, falling off, decoration layer blooming and the like of the decorative veneer are easy to occur.
Therefore, it is desirable to provide a decorative veneer interfacial agent coated on the back surface of the existing coated substrate, which can significantly improve the tensile bonding strength between the coated substrate and the special bonding mortar for decorative veneers and also improve the waterproof performance of the decorative veneers, and a preparation method thereof.
Disclosure of Invention
The invention provides a decorative veneer interface agent which can be coated on the back of a coated substrate of a decorative veneer, and has the advantages of effectively improving the tensile bonding strength of the coated substrate and bonding mortar of the decorative veneer and improving the waterproof performance of the decorative veneer.
The technical scheme of the invention is as follows:
the decorative veneer interface agent comprises the following components in parts by weight: 500 parts of 480-one water, 3-5 parts of cellulose, 1-2 parts of a wetting agent, 0.5-1.5 parts of a defoaming agent, 520 parts of 480-one emulsion and 0.25-0.75 part of a pH regulator, wherein the pH value of the decorative veneer interface agent is 8-9, the cellulose is hydroxypropyl methyl cellulose with the viscosity of 7.0-8.0 ten thousand mPa.s at 25 ℃, the wetting agent is an alkyl polyoxyethylene ether wetting agent, the emulsion is a styrene-acrylic emulsion, and the pH regulator is an organic amine pH regulator.
The decorative veneer interface agent enables the decorative veneer interface agent to obviously improve the tensile bonding strength of a coating substrate and bonding mortar (special for a heat-preservation decorative plate) after being coated on the back surface of the coating substrate of a decorative veneer through the matching of optimized components and the dosage proportion thereof, and simultaneously improves the waterproof performance of the decorative veneer, and can effectively solve the problems of falling, pulverization, decorative finish layer flowering and the like after the back surface of the coating substrate is directly bonded with the bonding mortar (special for the heat-preservation decorative plate) without treatment at present.
The wetting agent of the decorative veneer interface agent is preferably an alkyl polyoxyethylene ether wetting agent which has low VOC, low odor, no APEO, easy water solubility and low foam, is used for pigment dispersion, can obviously improve the fluidity of color paste particularly for red and yellow pigments, provides larger adsorption area, is used for emulsion post-stabilization, and can improve the mechanical and freeze-thaw performance and ensure the chemical stability; the emulsion is preferably styrene-acrylic emulsion, namely styrene/acrylate emulsion, does not contain formaldehyde and APEO, is green and environment-friendly, has excellent water resistance and adhesive strength with various substrates, is particularly suitable for cement substrates, has excellent alkali resistance and chalking resistance, can still maintain the excellent performance of a coating film even under severe environment, has low glass transition temperature Tg of-8 ℃, has excellent flexibility and cracking resistance, and can provide enough open time for the formula; the cellulose is preferably hydroxypropyl methylcellulose with viscosity of 7.5 ten thousand mPa.s at 25 ℃; the pH regulator is preferably an organic amine pH regulator, particularly is primary amine, and has the characteristics of high alkalinity, high buffer capacity, low odor, low volatility, no yellowing, dispersion assistance, microorganism resistance, low VOC and long-term durability in controlling the pH value of the formula.
The action mechanism of each component is as follows: the water is used as a carrier of the whole interface agent and uniformly carries each component. The defoaming agent can effectively reduce bubbles generated during preparation and packaging of the interfacial agent on one hand, and can quickly eliminate bubbles generated during coating on the other hand, so that the compactness of a paint film is improved. The wetting agent can improve the surface tension and permeability of the interfacial agent, so that the interfacial agent can better wet a substrate, and the adhesion of the interfacial agent is improved. The bactericide can prevent the growth of microorganisms on the surface of the substrate to influence the long-term effect of the interface agent on one hand, and can prevent the corrosion for a long time (180 days) on the other hand, thereby prolonging the storage time of the interface agent. The cellulose mainly plays a role in thickening, can improve the adhesive force of the interface agent, and improves the workability, rheological property and film forming effect of the interface agent, thereby improving the water resistance of the interface agent. The black paste mainly plays a role in marking, and is convenient for distinguishing the areas where the base material is brushed from the areas where the base material is not brushed. The emulsion is used as a film forming substance, and after the construction and coating of the interface agent are finished, the components can be firmly bonded together to form a layer of film which is firmly attached to a base material.
The comprehensive action mechanism of each component is as follows: the water acts as a carrier for the entire interfacial agent, uniformly supporting the components. The defoaming agent can effectively reduce bubbles generated during preparation and packaging of the interfacial agent on one hand, and can quickly eliminate bubbles generated during coating on the other hand, so that the compactness of a paint film is improved. The wetting agent can improve the surface tension and permeability of the interfacial agent, so that the interfacial agent can better wet a substrate, and the adhesion of the interfacial agent is improved. The cellulose mainly plays a role in thickening, can improve the adhesive force of the interface agent, and improves the workability, rheological property and film forming effect of the interface agent, thereby improving the water resistance of the interface agent.
In summary, when the construction temperature is above 5 ℃, after the interface agent is coated on the back surface of the coated substrate of the decorative veneer, the defoaming agent can quickly eliminate bubbles on the surface of a paint film, and along with the volatilization of water, the repulsion action generated by adding the pH regulator is gradually weakened, the original system stability is broken, and the emulsion polymer gradually gets close to but can still freely move. At this time, the wetting agent reduces the surface tension thereof, and promotes penetration thereof into the interior of the coated substrate of the decorative veneer. With the further volatilization of water, the adsorption layer on the surface of the emulsion polymer is damaged to form irreversible contact, and under the action of surface tension, emulsion polymer particles start to deform and coalesce into a film, molecular chains are diffused, permeated and wound mutually, a paint film is formed gradually, and the performance is also improved gradually.
The weight parts of the components are respectively as follows: 490 parts of water, 4 parts of cellulose, 1.5 parts of a wetting agent, 1 part of a defoaming agent, 500 parts of an emulsion and 0.5 part of a pH regulator, wherein the cellulose is hydroxypropyl methyl cellulose with the viscosity of 7.5 ten thousand mPa.s at 25 ℃.
The components with the optimal proportion can ensure that the decorative veneer interface agent obtains the optimal tensile bonding strength and the optimal waterproof performance with the bonding mortar after being coated on the back surface of the coating substrate of the decorative veneer.
The decorative veneer interface agent also comprises 1 weight part of black paste and/or 2 weight parts of bactericide.
The black paste mainly plays a role in marking, and is convenient for distinguishing the areas where the base material is brushed from the areas where the base material is not brushed. The bactericide can prevent the growth of microorganisms on the surface of the base material from influencing the long-term effect of the interface agent, and can prevent the long-term corrosion and improve the storage time (up to 180 days) of the interface agent. After the paint film is formed, the bactericide can be used for long-term corrosion prevention, and the performance of the paint film is guaranteed not to be damaged. The optimal effect can be obtained by using the black paste and the bactericide in the optimal proportion with the least amount.
The water is tap water, the defoaming agent is mineral oil defoaming agent, the black paste is carbon black paste, and the bactericide is synergistic bactericide without CIT, AOX and VOC.
The tap water has low cost and convenient material acquisition. The preferred mineral oil defoamer defoams quickly, is not affected by severe temperature and pressure, is still effective in acidic and alkaline environments, and is silicone-free. The preferable carbon black color paste has excellent light resistance, weather resistance, chemical medium resistance and lasting color retention. The preferred synergistic bactericide without CIT, AOX and VOC is particularly suitable for the wet preservation of aqueous products sensitive to formaldehyde, has very broad-spectrum bactericidal activity on bacteria, molds and yeasts causing the pollution and degradation of the aqueous products, and is used under the conditions of pH8-10 and temperature not higher than 80 ℃.
The coating substrate of the decorative veneer is a non-asbestos calcium silicate plate or a fiber reinforced cement flat plate.
The coated substrate of the decorative veneer is steamed and dried when leaving a factory, and the water content is generally below 10%, so the water absorption capacity is high (about 28%). The optimized coating substrate is common, convenient in material taking and low in cost.
The preparation method of the decorative veneer interface agent comprises the following steps of:
(1) pretreatment of cellulose: heating part of water to 58-62 ℃, pre-dissolving cellulose in the water to ensure that the mass ratio of the cellulose is 1.8-2.2%, and obtaining a cellulose solution;
(2) mixing the components: and pouring the cellulose solution, the wetting agent, the defoaming agent, the emulsion, the pH regulator and the rest water into a container, and stirring and mixing at the speed of 700-900r/min for at least 15min to ensure that the pH value of the mixture is 8-9, thus obtaining the decorative veneer interface agent.
The preparation method of the decorative veneer interface agent with optimized process parameters and steps ensures that the components of the decorative veneer interface agent are mixed more quickly and uniformly so as to effectively ensure the quality of the decorative veneer interface agent.
And (3) when the components are mixed in the step (2), 1 part by weight of black paste and/or 2 parts by weight of bactericide are also added.
The black paste is convenient to use, whether the decorative veneer interface agent is coated on the board can be distinguished, and the bactericide can reduce the bacteria content of the board and prolong the quality guarantee period of the board.
The stirring and mixing speed in the step (2) is 800 r/min.
The preferred stirring speed parameters allow the components to achieve the best dispersive mixing.
Compared with the prior art, the method has the following advantages:
1) the decorative veneer interface agent disclosed by the application is matched with the optimized components and the dosage proportion thereof, so that after the decorative veneer interface agent is coated on the back surface of a coating substrate of a decorative veneer, the tensile bonding strength of the coating substrate and bonding mortar is obviously improved, and meanwhile, the waterproof performance of the coating substrate is improved, so that the phenomena of falling off, chalking, decorative finish layer flowering and the like which are caused after the back surface of the coating substrate is directly bonded with the bonding mortar without treatment at present are effectively solved;
2) the components with the optimal proportion can ensure that the decorative veneer interface agent obtains the optimal tensile bonding strength and the optimal waterproof performance with the bonding mortar after being coated on the back of the coating substrate of the decorative veneer;
3) the use of the black paste is convenient to distinguish whether the decorative veneer interface agent is coated on the board, and the use of the bactericide can reduce the bacteria content of the board and prolong the shelf life of the board;
4) the preparation method of the decorative veneer interface agent with optimized raw material pretreatment, process and steps ensures the excellent performance of the produced decorative veneer interface agent.
Drawings
FIG. 1 is a graph of tensile bond strength test results for a blank set;
FIG. 2 is a graph showing the results of a tensile bond strength test of the decorative veneer interface agent according to the present invention;
FIG. 3 is an initial view of a water permeability test of the decorative veneer interface agent and blank set according to the present invention;
FIG. 4 is a final drawing of the water permeability test of the decorative veneer interface agent and blank set of the present invention.
Description of reference numerals:
Detailed Description
Raw material and equipment information:
| name of Material | Specification ofModel number | Manufacturer of the product |
| Wetting agent | LCN070 | Crainen chemical (China) Co., Ltd |
| Defoaming agent | F5800C | Rodili sub-cluster |
| Bactericide | ACTICIDEMBS | Tuo Tol group of England |
| Emulsion and method of making | Top damTM2000 or sky damTM2012 | Rohm and Haas China Co |
| Cellulose, process for producing the same, and process for producing the same | GMC75XS | Shanghai Huichang Fine chemical Co., Ltd |
| PH regulator | AMP-95 | Dow chemical Co Ltd |
| Black paste | SM6800HT | Suzhou science and technology limited |
| Asbestos-free calcium silicate board | D1.4 | Mountain of BuddhaJinfu Board industry Co Ltd |
| Special bonding mortar for decorative veneer | SGS107 | Sichuan three-tree paint Co Ltd |
| Universal testing machine | UTM4503 | Shenzhen Sansi vertical and horizontal science and technology shares, Inc |
| Building paint water permeability test device (funnel) | 95mL | Shanghai Meiyu instruments and Equipment Limited |
Example 1
The invention relates to a decorative veneer interface agent, which comprises the following components in parts by weight: 490 portions of water, 4 portions of cellulose, 1.5 portions of wetting agent, 1 portion of defoaming agent, 500 portions of emulsion and 0.5 portion of pH regulator, wherein the pH value of the decorative veneer interface agent is 8-9, the cellulose is hydroxypropyl methyl cellulose with the viscosity of 7.5 ten thousand mPa.s at 25 ℃, the wetting agent is alkyl polyoxyethylene ether wetting agent, the emulsion is styrene-acrylic emulsion, and the pH regulator is organic amine pH regulator.
Preferably, the decorative veneer interface agent further comprises 1 part by weight of black paste and/or 2 parts by weight of bactericide.
Preferably, the water is tap water, the defoaming agent is a mineral oil defoaming agent, the black paste is a carbon black paste, and the bactericide is a synergistic bactericide without CIT, AOX and VOC.
Preferably, the coating substrate of the decorative veneer is a non-asbestos calcium silicate plate or a fiber reinforced cement flat plate or the like.
The preparation method of the decorative veneer interface agent is characterized by comprising the following steps: comprises the following steps in sequence:
(1) pretreatment of cellulose: heating part of water to 60 ℃, pre-dissolving cellulose in the water to ensure that the mass ratio of the cellulose is 2 percent, and obtaining a cellulose solution;
(2) mixing the components: and pouring the cellulose solution, the wetting agent, the defoaming agent, the emulsion, the pH regulator and the rest water into a container, stirring and mixing at the speed of 800r/min for at least 15min to ensure that the pH value of the mixture is 8-9, thus obtaining the decorative veneer interface agent.
Preferably, 1 part by weight of black paste and/or 2 parts by weight of bactericide is also added when the components are mixed in the step (2).
Example 2
The invention relates to a decorative veneer interface agent, which comprises the following components in parts by weight: 480 parts of water, 5 parts of cellulose, 1 part of wetting agent, 1.5 parts of defoaming agent, 480 parts of emulsion and 0.75 part of pH regulator, wherein the pH value of the decorative veneer interface agent is 8-9, the cellulose is hydroxypropyl methyl cellulose with the viscosity of 7.0 ten thousand mPa.s at 25 ℃, the wetting agent is alkyl polyoxyethylene ether wetting agent, the emulsion is styrene-acrylic emulsion, and the pH regulator is organic amine pH regulator.
Preferably, the decorative veneer interface agent further comprises 1 part by weight of black paste and/or 2 parts by weight of bactericide.
Preferably, the water is tap water, the defoaming agent is a mineral oil defoaming agent, the black paste is a carbon black paste, and the bactericide is a synergistic bactericide without CIT, AOX and VOC.
Preferably, the coating substrate of the decorative veneer is a non-asbestos calcium silicate plate or a fiber reinforced cement flat plate or the like.
The preparation method of the decorative veneer interface agent is characterized by comprising the following steps: comprises the following steps in sequence:
(1) pretreatment of cellulose: heating part of water to 62 ℃, pre-dissolving cellulose in the water to ensure that the mass ratio of the cellulose is 1.8 percent, and obtaining a cellulose solution;
(2) mixing the components: and pouring the cellulose solution, the wetting agent, the defoaming agent, the emulsion, the pH regulator and the rest water into a container, stirring and mixing at the speed of 900r/min for at least 15min to ensure that the pH value of the mixture is 8-9, thus obtaining the decorative veneer interface agent.
Preferably, 1 part by weight of black paste and/or 2 parts by weight of bactericide is also added when the components are mixed in the step (2).
Example 3
The invention relates to a decorative veneer interface agent, which comprises the following components in parts by weight: 500 parts of water, 3 parts of cellulose, 2 parts of a wetting agent, 0.5 part of a defoaming agent, 520 parts of an emulsion and 0.25 part of a pH regulator, wherein the pH value of the decorative veneer interface agent is 8-9, the cellulose is hydroxypropyl methyl cellulose with the viscosity of 8.0 ten thousand mPa & s at 25 ℃, the wetting agent is an alkyl polyoxyethylene ether wetting agent, the emulsion is a styrene-acrylic emulsion, and the pH regulator is an organic amine pH regulator.
Preferably, the decorative veneer interface agent further comprises 1 part by weight of black paste and/or 2 parts by weight of bactericide.
Preferably, the water is tap water, the defoaming agent is a mineral oil defoaming agent, the black paste is a carbon black paste, and the bactericide is a synergistic bactericide without CIT, AOX and VOC.
Preferably, the coating substrate of the decorative veneer is a non-asbestos calcium silicate plate or a fiber reinforced cement flat plate or the like.
The preparation method of the decorative veneer interface agent is characterized by comprising the following steps: comprises the following steps in sequence:
(1) pretreatment of cellulose: heating part of water to 58 ℃, pre-dissolving cellulose in the water to ensure that the mass ratio of the cellulose is 2.2 percent, and obtaining a cellulose solution;
(2) mixing the components: and pouring the cellulose solution, the wetting agent, the defoaming agent, the emulsion, the pH regulator and the rest water into a container, stirring and mixing at the speed of 700r/min for at least 15min to ensure that the pH value of the mixture is 8-9, thus obtaining the decorative veneer interface agent.
Preferably, 1 part by weight of black paste and/or 2 parts by weight of bactericide is also added when the components are mixed in the step (2).
And (3) test results:
tensile bond Strength test
(I) test environment
Standard curing conditions: air temperature (23 ± 2) ° c; relative humidity (50. + -. 5)%
Standard test environment: air temperature (23 + -5) DEG C; relative humidity (50. + -. 10)%
(II) sample preparation
(1) Cutting asbestos-free calcium silicate board (coated substrate of other decorative veneer such as fiber reinforced cement flat plate) into multiple pieces of 50mm × 50mm, and totally 24 pieces;
(2) randomly brushing 12 blocks of the decorative veneer interface agent on the back surface of the decorative veneer interface agent by using a short hair roller, wherein the coating weight is (0.15-0.20) kg/m2And curing for 24 hours under standard curing conditions after finishing coating;
(3) uniformly mixing the bonding mortar (special for the heat-preservation decorative plate) and water according to the volume ratio of 5:1, standing for 10min, forming the bonding mortar on the back of the asbestos-free calcium silicate plate by using a forming die frame with the thickness of 40mm multiplied by 40mm, and curing for 14d under standard curing conditions to obtain a sample;
(4) bonding a metal block of 40mm multiplied by 40mm on one side of the mortar layer, which is opposite to the asbestos-free calcium silicate board, by using a high-strength adhesive;
(5) before the water-resistant strength test, the test sample is immersed in water for 48 hours, taken out and dried for 2 hours and 7 days at normal temperature (namely 25 +/-2 ℃) respectively, and then tested.
(III) test procedure
The test specimens were mounted on a universal tester under standard test conditions and tensile bond strength measurements were made (tensile speed was (5. + -. 1) mm/min). The strength at failure of each specimen was recorded to the nearest 0.01 MPa. If the slug is detached from the specimen, the test value is invalid.
(IV) test results
Tensile bonding strength between bonding mortar (special for thermal insulation decorative plate) and decorative veneer interface agent (with or without)
(V) analysis of results
As can be seen from the above table: the tensile bond strength of the blank group (without the decorative veneer interfacial agent applied) was: original intensity mean value: 0.18 MPa; mean water strength (immersion 48h, dry 2 h): 0.11 MPa; mean water strength (immersion 48h, dry 7 d): 0.23 MPa. The tensile bond strength of the test group (coated decorative veneer interface agent) was: original intensity mean value: 0.53 MPa; mean water strength (immersion 48h, dry 2 h): 0.39 MPa; mean water strength (immersion 48h, dry 7 d): 0.52 MPa.
Reason analysis: the bonding mortar (special for the heat-insulating decorative plate) is a hydraulic cementing material, if the strength is not formed, the final bonding strength of the mortar can be seriously influenced by the dehydration of the mortar at the bonding interface, and the single plate of the decorative plate is steamed and dried at high temperature, the water content of the single plate is about 10 percent, but the water absorption rate of the single plate is about 28 percent, so when the bonding mortar (special for the heat-insulating decorative plate) is coated on the back surface of the asbestos-free calcium silicate plate, the water in the mortar can be absorbed by the single plate, the dehydration of the mortar at the interface is caused, the strength is reduced, the asbestos-free calcium silicate plate cannot be damaged, or the internal part of the asbestos-free calcium silicate plate is damaged, and only a thin layer of.
The decorative veneer interface agent is a material with low Tg value and excellent waterproofness, adhesive force and sealing property, can effectively prevent the bonding mortar (special for a thermal insulation decorative plate) from losing water when contacting with a non-asbestos calcium silicate plate without influencing the bonding strength when being coated on the back surface of the non-asbestos calcium silicate plate, increases the deformation amount between two rigid materials because of the low Tg value and the adhesive force, ensures that the decorative veneer interface agent can be firmly attached to the back surface of the non-asbestos calcium silicate plate, and has good compatibility with the bonding mortar (special for the thermal insulation decorative plate), so the bonding strength can reach the performance index of 4.3.1 bonding mortar in the standard requirement (DB33/T1141-2017 application technical specification of an external thermal insulation system of a thermal insulation decorative plate external wall), namely the tensile bonding strength (with a bottom plate) is not less than 0.40MPa, and the water resistance strength (soaking for 48 hours, the drying time is 2h) is more than or equal to 0.30MPa, the water resistance strength (soaking time is 48h, and drying time is 7d) is more than or equal to 0.40MPa, the standard clearly puts forward the tensile bonding strength requirement of the bonding mortar and the calcium silicate board plates for the first time in the whole industry, and the failure state is ideal (as shown in figure 2) (namely, the inner part of the mortar is broken or the surface of the base material is damaged).
Second, Water permeability test
(I) test environment
Standard curing conditions: air temperature (23 ± 2) ° c; relative humidity (50. + -. 5)%
Standard test environment: air temperature (23 + -5) DEG C; relative humidity (50. + -. 10)%
(II) sample preparation
(1) Randomly sampling, and cutting the asbestos-free calcium silicate board into a plurality of small blocks of 250mm multiplied by 250 mm;
(2) coating decorative veneer interface agent on the back of the small block by using a short hair roller, wherein the coating weight is (0.15-0.20) kg/m2And curing the coated small blocks (samples) for 24 hours under standard curing conditions.
(III) test procedure
And removing a sample, placing the sample in a horizontal state, enabling one surface coated with the decorative veneer interface agent to face upwards, placing a paint water permeability test device (funnel) with openings at the upper and lower parts in the center of the surface, and sealing the edges of the openings at the bottom ends of the sample and the paint water permeability test device (funnel) by using weather-resistant silicone sealant to ensure that liquid cannot seep out from a gap between the sample and the paint water permeability test device (funnel). After the weather-resistant silicone sealant is dried, slowly injecting three-level test water (namely distilled water with the conductivity less than or equal to 5us/cm at 25 ℃) into the paint water permeability test device (funnel) until the water level reaches 0mL scale, adjusting the liquid level to 0mL scale again after confirming that no bubbles exist in the container, covering and wrapping an upper opening of the paint water permeability test device (funnel) by tinfoil paper, standing for 24 hours in a standard test environment, and observing and recording the number of milliliters of liquid level reduction.
(IV) test results
Water permeability of the interfacial agent
(V) analysis of results
The back of the blank group is not treated, and water can permeate into the asbestos-free calcium silicate board until the asbestos-free calcium silicate board is saturated because the asbestos-free calcium silicate board has low water content (about 10%) and high water absorption (about 28%);
the preferred emulsion in the formula of the decorative veneer interface agent coated on the back of the test group has longer hydrophobic side chains, so that the prepared decorative veneer interface agent has certain hydrophobicity, and a protective film can be formed on the surface of the asbestos-free calcium silicate board to prevent water from permeating into the asbestos-free calcium silicate board to a certain extent, so that only a small amount of water permeates into the interior of the asbestos-free calcium silicate board through the decorative veneer interface agent layer.
Third, summarize
Therefore, the decorative veneer interface agent has good tensile bonding strength and waterproof performance.
The decorative veneer interfacial agent and the method for preparing the same according to the present invention are not limited to the above-mentioned embodiments, and any modification or replacement according to the principles of the present invention should be within the scope of the present invention.
Claims (8)
1. A decorative veneer interface agent is characterized in that: the paint comprises the following components in parts by weight: 500 parts of 480-one water, 3-5 parts of cellulose, 1-2 parts of a wetting agent, 0.5-1.5 parts of a defoaming agent, 520 parts of 480-one emulsion and 0.25-0.75 part of a pH regulator, wherein the pH value of the decorative veneer interface agent is 8-9, the cellulose is hydroxypropyl methyl cellulose with the viscosity of 7.0-8.0 ten thousand mPa.s at 25 ℃, the wetting agent is an alkyl polyoxyethylene ether wetting agent, the emulsion is a styrene-acrylic emulsion, and the pH regulator is an organic amine pH regulator.
2. The decorative veneer interfacial agent according to claim 1, wherein: the weight parts of the components are respectively as follows: 490 parts of water, 4 parts of cellulose, 1.5 parts of a wetting agent, 1 part of a defoaming agent, 500 parts of an emulsion and 0.5 part of a pH regulator, wherein the cellulose is hydroxypropyl methyl cellulose with the viscosity of 7.5 ten thousand mPa.s at 25 ℃.
3. The decorative veneer interfacial agent according to claim 1, wherein: the decorative veneer interface agent also comprises 1 weight part of black paste and/or 2 weight parts of bactericide.
4. The decorative veneer interfacial agent according to claim 3, wherein: the water is tap water, the defoaming agent is mineral oil defoaming agent, the black paste is carbon black paste, and the bactericide is synergistic bactericide without CIT, AOX and VOC.
5. The decorative veneer interfacial agent according to claim 1, wherein: the coating substrate of the decorative veneer is a non-asbestos calcium silicate plate or a fiber reinforced cement flat plate.
6. The method for preparing the decorative veneer interface agent according to claim 1 or 2, characterized in that: comprises the following steps in sequence:
(1) pretreatment of cellulose: heating part of water to 58-62 ℃, pre-dissolving cellulose in the water to ensure that the mass ratio of the cellulose is 1.8-2.2%, and obtaining a cellulose solution;
(2) mixing the components: and pouring the cellulose solution, the wetting agent, the defoaming agent, the emulsion, the pH regulator and the rest water into a container, and stirring and mixing at the speed of 700-900r/min for at least 15min to ensure that the pH value of the mixture is 8-9, thus obtaining the decorative veneer interface agent.
7. The method for preparing the decorative veneer interface agent according to claim 6, wherein: and (3) when the components are mixed in the step (2), 1 part by weight of black paste and/or 2 parts by weight of bactericide are also added.
8. The method for preparing the decorative veneer interface agent according to claim 6, wherein: the stirring and mixing speed in the step (2) is 800 r/min.
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