CN111909642A - Melamine formaldehyde resin adhesive, calcium silicate composite floor and production process - Google Patents
Melamine formaldehyde resin adhesive, calcium silicate composite floor and production process Download PDFInfo
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- CN111909642A CN111909642A CN202010816464.5A CN202010816464A CN111909642A CN 111909642 A CN111909642 A CN 111909642A CN 202010816464 A CN202010816464 A CN 202010816464A CN 111909642 A CN111909642 A CN 111909642A
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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
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J161/00—Adhesives based on condensation polymers of aldehydes or ketones; Adhesives based on derivatives of such polymers
- C09J161/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C09J161/32—Modified amine-aldehyde condensates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
- B32B13/02—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material with fibres or particles being present as additives in the layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
- B32B13/04—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/40—Chemically modified polycondensates
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/02—Flooring or floor layers composed of a number of similar elements
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- Architecture (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
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Abstract
A melamine formaldehyde resin adhesive and calcium silicate composite floor and a production process belong to the technical field of green energy-saving building materials. The melamine formaldehyde resin glue comprises a polymer obtained by polymerizing formaldehyde and melamine and adding an internal plasticizer for modification, wherein the internal plasticizer is selected from one or more of caprolactam, glycerol, diethylene glycol and industrial sugar. The calcium silicate composite floor comprises a substrate layer and other functional layers, wherein the substrate layer is a calcium silicate board, and the layers are adhered together through the melamine formaldehyde resin adhesive. The melamine formaldehyde resin adhesive, the calcium silicate composite floor and the production process can realize the pressing effect and the gluing effect under the condition of low-pressure hot pressing.
Description
Technical Field
The application relates to the technical field of green energy-saving building materials, in particular to a melamine formaldehyde resin adhesive and calcium silicate composite floor and a production process.
Background
The calcium silicate plate is made of siliceous material (SiO as main component)2Such as quartz powder, fly ash, diatomite and the like), calcareous materials (the main component is CaO, such as lime, carbide slag, cement and the like), reinforcing fibers, auxiliary agents and the like are mixed according to a certain proportion, and the novel energy-saving building material is prepared by the working procedures of mould pressing, sheet making or pulp flowing, steam pressure curing and the like. Currently, calcium silicate boards are widely used in marine deck boards, suspended ceilings and non-load bearing walls of buildings, and other locations where fire protection is required due to their high strength, low volume weight, good workability and non-flammability. The calcium silicate board has the advantages of water resistance, moisture resistance and the like which are not possessed by wood floors and the advantages of environmental protection and reproducibility which are not possessed by plastic floors mainly made of PVC materials, so that the calcium silicate board has a plurality of advantages when being introduced into the floor field.
In the field of flooring, a calcium silicate board is generally used as a substrate layer, an adhesive is used, and the substrate layer and other functional layers are glued and compacted into a whole through a hot pressing process to form a block composite flooring. However, the conventional adhesive has good fluidity only under high pressure (pressure higher than 10 Mpa), and the high pressure of the calcium silicate board in the hot pressing process can cause irreversible damage, such as cracking and the like, to the board, especially to the substrate layer, thereby affecting later use.
Therefore, at present, a production process of the calcium silicate composite floor capable of simultaneously satisfying the gluing effect and the pressing effect does not exist.
Disclosure of Invention
The embodiment of the application aims to provide the melamine formaldehyde resin adhesive, the calcium silicate composite floor and the production process, and the pressing effect and the gluing effect under the low-pressure hot-pressing condition can be realized.
The application is realized as follows:
in a first aspect, examples of the present application provide a melamine formaldehyde resin adhesive comprising a polymer obtained by polymerisation of formaldehyde and melamine and modification with the addition of an internal plasticiser selected from the group consisting of caprolactam, glycerol, diethylene glycol and a combination of one or more of industrial sugars.
In the technical scheme, compared with an unmodified conventional adhesive, the melamine formaldehyde resin adhesive obtained by modifying the internal plasticizer has better fluidity, stability and flexibility, and particularly has better fluidity under the conditions of low pressure and hot pressing, so that the melamine formaldehyde resin adhesive can be used as an adhesive for calcium silicate composite floors and can realize the pressing effect and the gluing effect under the conditions of low pressure and hot pressing.
In one possible embodiment of the present application, the molar ratio of formaldehyde to melamine is from 2 to 3: 1;
and/or the addition amount of the internal plasticizer is 10-20% of the dosage of the melamine.
In the above technical solution, formaldehyde and melamine in a molar ratio of 2-3:1 can almost all be condensed to form a polymer; a certain amount of internal plasticizer is added according to the amount of 10-20% of the melamine, so that the internal plasticizer can be almost completely grafted to the polymer, and the modification effect on the polymer is good.
In one possible embodiment of the present application, the internal plasticizer is caprolactam and industrial sucrose; alternatively, the mass ratio of caprolactam to industrial cane is 2-3: 1.
In the technical scheme, the caprolactam and the industrial sucrose are adopted, and particularly the internal plasticizer is formed by combining according to a certain using amount ratio, so that a better modification effect can be obtained.
In one possible embodiment of the present application, a penetrant, a release agent, and a curing agent are further included.
In the technical scheme, the penetrating agent, the release agent and the curing agent can enhance the effect of the melamine formaldehyde resin adhesive as the adhesive of the composite floor.
In a second aspect, the present application provides a method for preparing the melamine formaldehyde resin adhesive provided in the first aspect, which comprises the following steps:
under stirring, the internal plasticizer and melamine are added into the formaldehyde solution and reacted at 80-90 ℃.
In one possible embodiment of the present application, it comprises the following steps:
adding a formaldehyde solution into the reaction kettle, starting constant-speed stirring at the stirring speed of 80-100r/min, adjusting the pH value of the mixed solution to 9.0-9.5, and slowly adding the caprolactam;
heating the solution to 40-50 ℃, and adding melamine;
heating the temperature of the reaction solution to 80-90 ℃ within 15min, and reacting for 20-30min under the condition of heat preservation;
adding industrial sucrose, keeping the temperature of the reaction solution for 50-60min, measuring the dilution, and discharging when the dilution is 230-200% at the reaction end point and the temperature is reduced to room temperature-40 ℃ within 5 min.
In the technical scheme, the polycondensation reaction of formaldehyde and melamine is ensured to produce a polymer, and the caprolactone amine and the industrial sucrose branched chain are introduced, so that the melamine formaldehyde resin adhesive modified by the caprolactone amine and the industrial sucrose is obtained.
In a third aspect, the present application provides a calcium silicate composite floor, which comprises a substrate layer and other functional layers, wherein the substrate layer is a calcium silicate board, and the layers are adhered together through the melamine formaldehyde resin adhesive provided by the first aspect.
In the technical scheme, the melamine formaldehyde resin adhesive disclosed by the embodiment of the application is used as an adhesive, and the pressing effect and the adhesive effect of the calcium silicate composite floor prepared under the low-pressure hot-pressing condition can be realized, so that the stability of the calcium silicate composite floor is ensured, and the situations of cracking and non-adhesion are avoided.
In one possible embodiment of the application, the wear-resistant coating comprises a balance layer, a substrate layer, a decoration layer and a wear-resistant layer which are sequentially stacked from bottom to top;
optionally, the thickness of the substrate layer is 2-8 mm.
In a fourth aspect, the present application provides a low-pressure production process of calcium silicate composite flooring provided by the third aspect, comprising the steps of: putting other functional layers except the substrate layer into melamine formaldehyde resin glue for dipping treatment;
and stacking the substrate layer and the other functional layers after the dipping treatment in sequence, and carrying out hot pressing at the hot pressing temperature of 160-200 ℃, the hot pressing pressure of 1-10MPa and the hot pressing time of 10-50 s.
In the technical scheme, the calcium silicate composite floor is prepared by adopting the melamine formaldehyde resin adhesive as the adhesive under the conditions of low pressure and hot pressing, the process is simple, and the product performance is good.
In a possible implementation manner of the application, the method further comprises the following curing treatment, wherein the curing temperature is 25-30 ℃, and the curing time is 1-3 d.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 shows a schematic view of a laminate structure of a calcium silicate composite floor in an example of the application.
Icon: 110-an equilibrium layer; 120-a substrate layer; 130-a decorative layer; 140-wear resistant layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of embodiments of the present application, generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The melamine formaldehyde resin adhesive, the calcium silicate composite flooring and the production process of the present invention will be described in detail below.
As far as the inventors know, the existing hot pressing process may cause damage to the calcium silicate board, and thus it is preferable to process the calcium silicate composite flooring using a low pressure process. However, the conventional adhesive, such as melamine formaldehyde glue (MF glue, melamine formaldehyde resin glue), has high rigidity and poor fluidity, and has good fluidity only under high pressure, so that the adhesive needs to be modified so as to have good adhesion effect under a low-pressure process, so that the processing method of the calcium silicate composite floor is adjusted to be a low-pressure process mode, and the damage of the board is prevented, and the later use is influenced.
In view of the above facts, the inventors have studied and proposed a melamine formaldehyde resin adhesive, a calcium silicate composite floor and a production process thereof.
First, the present application provides a melamine formaldehyde resin adhesive comprising a polymer obtained by polymerizing formaldehyde and melamine and modifying the polymer by adding an internal plasticizer selected from the group consisting of caprolactam, glycerol, diethylene glycol and industrial sugar, wherein the internal plasticizer is added during the polymerization of formaldehyde and melamine.
The inventor finds that: the melamine formaldehyde glue obtained by polymerizing formaldehyde and melamine only has good fluidity under high pressure, but the fluidity, stability and flexibility of the polymer can be improved after the modification by adding the internal plasticizer, so that the melamine formaldehyde glue also has good fluidity under the conditions of low pressure and hot pressing. The internal plasticizer is modified by introducing branched chains on polymer molecules, possibly grafted to a main chain or branched chains, so that the distance between the polymer molecules is increased, the acting force between molecular chains is reduced, and the flowability, the stability and the flexibility of the internal plasticizer are improved.
And the melamine formaldehyde resin adhesive has a flame retardant effect, and can improve the heat-resistant flame retardant property of the floor when used as a composite floor adhesive.
In the examples of the present application, the molar ratio of formaldehyde to melamine is generally 2-3: 1; the addition amount of the internal plasticizer is 10-20% of the dosage of melamine. The internal plasticizer is caprolactam and industrial sucrose; alternatively, the mass ratio of caprolactam to industrial cane is 2-3: 1.
In order to ensure the gluing effect of the melamine formaldehyde resin glue during the hot pressing of the composite floor, the melamine formaldehyde resin also comprises a penetrating agent, a release agent and a curing agent, which are usually added before the use. For example, because the polymer of the melamine formaldehyde resin adhesive has larger activity, when in use, a certain amount of curing agent is added to carry out heating curing.
As an example of the present application, the penetrating agent may be alkylphenol ethoxylates, which is added in an amount of 0.1% to 0.3% of the total amount of the melamine formaldehyde resin adhesive; the release agent can be water-based amino silicone oil, and the addition amount of the release agent accounts for 0.1-0.3% of the total amount of the melamine formaldehyde resin adhesive; the dosage of the curing agent accounts for 0.1 to 0.3 percent of the total amount of the melamine formaldehyde resin adhesive.
The application example also provides a preparation method of the melamine formaldehyde resin adhesive, which comprises the following steps:
under the condition of stirring, adding internal plasticizer and melamine into formaldehyde solution, reacting at 80-90 deg.C, cooling to room temperature-40 deg.C, i.e. 25-40 deg.C for standby, and said polycondensation reaction has no need of catalyst.
In the case of using caprolactam and industrial sucrose as internal plasticizer, the preparation method of the corresponding melamine formaldehyde resin adhesive specifically comprises the following steps:
after a certain amount of formaldehyde solution is added into the reaction kettle, starting a stirrer to start constant-speed stirring, wherein the stirring speed is 80-100r/min, adding a proper amount of 10% NaOH solution to adjust the pH value of the mixed solution to 9.0-9.5, continuously stirring, and slowly adding a certain amount of caprolactam.
The temperature of the solution is raised to 40-50 ℃, a certain amount of melamine is quickly added into the reaction kettle within a certain time, and the solution is stirred and heated.
Heating the temperature of the reaction solution to 80-90 ℃ within 15min, and reacting for 20-30min under the condition of heat preservation;
slowly adding a certain amount of industrial sucrose, keeping the temperature of the reaction solution for 50-60min, then measuring the dilution, and when the reaction end point is controlled to be 230-200% of the dilution, rapidly cooling to room temperature-40 ℃ within 5min, and discharging.
The description is as follows: the dilution determination method in the embodiment of the application is to take a sample out of a reaction kettle, immediately cool the sample to stop the reaction, absorb 5 ml of the sample into a small beaker or a triangular flask after the room temperature is reached, put distilled water into the sample from a burette until the sample slightly generates cloudy precipitation, and divide the volume of the added water by 5 ml to obtain the dilution of the sample.
In addition, the application example provides a calcium silicate composite floor, which comprises a substrate layer and other functional layers, wherein the substrate layer is a calcium silicate board, and the layers are adhered together through the melamine formaldehyde resin adhesive. The calcium silicate board as the base material layer is generally a fiber-reinforced calcium silicate board as a raw material, and the thickness of the base material layer is generally 2 to 8 mm.
In general, as shown in fig. 1, a calcium silicate composite floor includes a balance layer 110, a substrate layer 120, a decoration layer 130, and a wear-resistant layer 140, which are sequentially stacked from bottom to top, wherein the substrate layer 120 is a calcium silicate board made of calcium silicate, and the layers are adhered together by a melamine formaldehyde resin adhesive as exemplified in the present application.
The wear-resistant layer 140, the decoration layer 130 and the balance layer 110 are functional layers that can be thermally pressed and combined with the calcium silicate board, and the balance layer 110 is generally referred to as balance paper. The balance layer 110, the substrate layer 120, the decoration layer 130, and the wear layer 140 are generally combined together according to a certain weight ratio, such as each layer with the same area, 6000g of wear layer combined with 38g of decoration layer and 90g of balance paper.
The application example also provides a low-pressure production process of the calcium silicate composite floor, which comprises the following steps:
(1) preparing glue: adding a formaldehyde solution into the reaction kettle, starting a stirrer to stir uniformly, adding an internal plasticizer, adding melamine, heating, and cooling after the reaction is finished to obtain the melamine-formaldehyde resin adhesive for later use.
(2) Dipping: put into melamine formaldehyde resin glue with other functional layers except that the substrate layer and carry out the impregnation processing, because the substrate layer is usually in the same place with the inorganic matter bonding, soaks easily and expands into loose structure, can't carry out hot pressing technology, consequently need not the impregnation processing, only need other functional layer impregnations can realize subsequent hot briquetting. In the present example, no special temperature is required for impregnation. In the calcium silicate composite flooring having a general structure, as shown in fig. 1, the wear-resistant layer 140, the decorative layer 130, and the balance layer 110 are impregnated with the melamine formaldehyde resin adhesive.
(3) Hot pressing: and (3) stacking the substrate layer 120 and other functional layers after the dipping treatment in sequence, and performing hot pressing, specifically stacking the balance layer 110, the substrate layer 120, the decoration layer 130 and the wear-resistant layer 140 from bottom to top, pushing the stacked layers into a high-temperature press for hot pressing, wherein the hot pressing temperature is 160-200 ℃, the hot pressing pressure (low pressure) is 1-10MPa, and the hot pressing time is 10-50s, so as to obtain the formed plate.
(4) Health preserving: after the sheet material is formed, stacking and maintaining, wherein the maintaining temperature is 25-30 ℃, and the maintaining time is 1-3d, so as to obtain the calcium silicate composite floor.
The calcium silicate composite floor obtained by the low-pressure production process disclosed by the application example has the advantages of good dimensional stability, no cracking after high-temperature baking, low transverse and longitudinal shrinkage and small warpage.
The features and properties of the present application are described in further detail below with reference to examples.
Example 1
The embodiment provides a calcium silicate composite floor, which is prepared according to the following low-pressure production process:
(1) preparing glue: adding a certain amount of formaldehyde solution into the reaction kettle, starting a stirrer to stir at a constant speed, wherein the stirring speed is 100r/min, adding 10% NaOH solution to adjust the pH value of the mixed solution to 9.0, continuing stirring, and slowly adding a certain amount of caprolactam.
The temperature of the solution is raised to 40 ℃, a certain amount of melamine is quickly added into the reaction kettle in one step, and the solution is stirred and heated.
And (3) heating the temperature of the reaction solution to 90 ℃ within 15min, keeping the temperature, continuing to react for 30min, keeping the temperature, slowly adding a certain amount of industrial sucrose, keeping the temperature of the reaction solution for about 60min, starting measuring the water dilution, and quickly cooling to 40 ℃ when the reaction end point is controlled to be 200%, and discharging.
Wherein the molar ratio of formaldehyde to melamine is 2: 1; the mass ratio of caprolactam to industrial sugarcane is 2: 1; the total addition amount of caprolactam and industrial cane is 20 percent of the usage amount of melamine.
Before use, a penetrating agent accounting for 0.2 percent of the polymer solution, a release agent accounting for 0.2 percent of the polymer solution and a curing agent accounting for 0.2 percent of the polymer solution are added to obtain the melamine formaldehyde resin adhesive.
(2) Dipping: as shown in fig. 1, the wear-resistant layer 140, the decorative layer 130, and the balance layer 110 (balance paper) are subjected to an impregnation process using the melamine formaldehyde resin adhesive.
(3) Hot pressing: stacking the balance layer 110, the substrate layer 120 (calcium silicate board), the decoration layer 130 and the wear-resistant layer 140 from bottom to top, and pushing the stacked layers into a high-temperature press; the hot pressing temperature is 190 ℃, the time is 40s, and the pressure is 5 MPa.
(4) Health preserving: after the plates are formed, stacking and maintaining are carried out, the maintaining time is 2d, and the maintaining temperature is 30 ℃, so that the calcium silicate composite floor is obtained.
Example 2
This example provides a calcium silicate composite floor, which uses a low pressure production process substantially the same as that of example 1, except that: the molar ratio of formaldehyde to melamine is 3: 1; the mass ratio of caprolactam to industrial sugarcane is 3: 1; the total addition amount of caprolactam and industrial cane is 15% of the melamine dosage.
Example 3
This example provides a calcium silicate composite floor, which uses a low pressure production process substantially the same as that of example 1, except that: the pressure during hot pressing was 10 MPa.
Comparative example 1
This comparative example provides a calcium silicate composite floor using substantially the same production process as example 1, except that: the comparative example adopts a high-pressure production process, and the pressure during hot pressing is 15 Mpa.
The dimensional stability of the calcium silicate composite floorings of examples 1-3 and comparative example was tested as follows:
the dimensional stability of the floor is tested by a method of 80 ℃ and 6 hours according to the national standard of 4085-2015.
(1) Comparison of cracking conditions
Under the test method, the calcium silicate substrate layer of the floor produced by adopting the high-pressure production process in the comparative example 1 is cracked; while the flooring produced in examples 1 to 3 by the low pressure production process showed no signs of cracking of the substrate layer and other layers after the high temperature baking.
(2) Comparison of dimensional stability test
The test method comprises the following steps: three groups of samples were taken for each example and comparative example and the average value was taken;
and (3) testing size: 30cm by 30 cm;
and (3) testing temperature: at 80 ℃ for 6 h;
internal standard: the transverse and longitudinal shrinkage rate is less than or equal to 0.08 percent, and the warpage is less than or equal to 0.8 mm.
The test results were as follows:
table 1 dimensional stability test results for different products
As can be seen from table 1, the calcium silicate composite floor obtained by the low-pressure production process of the present application example has low transverse and longitudinal shrinkage, small warpage and good dimensional stability; the calcium silicate composite floor obtained by adopting the high-pressure production process has high transverse and longitudinal shrinkage, large warpage and relatively poor dimensional stability.
To sum up, the melamine formaldehyde resin adhesive, the calcium silicate composite floor and the production process of the melamine formaldehyde resin adhesive and the calcium silicate composite floor can achieve the pressing effect and the gluing effect under the low-pressure hot-pressing condition.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The melamine formaldehyde resin adhesive is characterized by comprising a polymer obtained by polymerizing formaldehyde and melamine and adding an internal plasticizer for modification, wherein the internal plasticizer is selected from one or more of caprolactam, glycerol, diethylene glycol and industrial sugar.
2. The melamine formaldehyde resin glue according to claim 1, characterized in that the molar ratio of said formaldehyde to said melamine is 2-3: 1;
and/or the addition amount of the internal plasticizer is 10% -20% of the dosage of melamine.
3. The melamine formaldehyde resin glue according to claim 1, characterized in that said internal plasticizers are caprolactam and industrial sucrose; optionally, the mass ratio of caprolactam to industrial cane is 2-3: 1.
4. The melamine formaldehyde resin glue according to claim 1, further comprising a penetrant, a release agent and a curing agent.
5. A method for preparing the melamine formaldehyde resin adhesive according to claim 1, wherein: which comprises the following steps:
under stirring, the internal plasticizer and melamine are added into the formaldehyde solution and reacted at 80-90 ℃.
6. A method of preparing melamine formaldehyde resin glue according to claim 5, characterised in that it comprises the steps of:
adding a formaldehyde solution into the reaction kettle, starting constant-speed stirring at the stirring speed of 80-100r/min, adjusting the pH value of the mixed solution to 9.0-9.5, and slowly adding the caprolactam;
heating the solution to 40-50 ℃, and adding melamine;
heating the temperature of the reaction solution to 80-90 ℃ within 15min, and reacting for 20-30min under the condition of heat preservation;
adding industrial sucrose, keeping the temperature of the reaction solution for 50-60min, measuring the dilution, and discharging when the dilution is 230-200% at the reaction end point and the temperature is reduced to room temperature-40 ℃ within 5 min.
7. A calcium silicate composite floor, characterized in that: the functional layer comprises a substrate layer and other functional layers, wherein the substrate layer is a calcium silicate board, and the layers are adhered together through the melamine formaldehyde resin adhesive as claimed in claim 1.
8. The calcium silicate composite floor as claimed in claim 7, comprising a balance layer, the substrate layer, the decoration layer and the wear-resistant layer sequentially stacked from bottom to top;
optionally, the thickness of the substrate layer is 2-8 mm.
9. A low pressure production process of a calcium silicate composite floor as claimed in claim 7, characterized in that: which comprises the following steps: putting other functional layers except the substrate layer into melamine formaldehyde resin glue for dipping treatment;
and stacking the substrate layer and the other functional layers after the dipping treatment in sequence, and carrying out hot pressing at the hot pressing temperature of 160-200 ℃, the hot pressing pressure of 1-10MPa and the hot pressing time of 10-50 s.
10. The low-pressure production process of the calcium silicate composite floor as claimed in claim 9, further comprising a subsequent curing treatment, wherein the curing temperature is 25-30 ℃ and the curing time is 1-3 d.
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