CN109609062B - Preparation method of artificial composite board flame-retardant adhesive - Google Patents
Preparation method of artificial composite board flame-retardant adhesive Download PDFInfo
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- CN109609062B CN109609062B CN201811428263.7A CN201811428263A CN109609062B CN 109609062 B CN109609062 B CN 109609062B CN 201811428263 A CN201811428263 A CN 201811428263A CN 109609062 B CN109609062 B CN 109609062B
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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
- C09J129/00—Adhesives 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 alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Adhesives based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Adhesives based on derivatives of such polymers
- C09J129/02—Homopolymers or copolymers of unsaturated alcohols
- C09J129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/16—Halogen-containing compounds
- C08K2003/166—Magnesium halide, e.g. magnesium chloride
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention relates to a preparation method of artificial composite board flame-retardant glue, which comprises the steps of respectively preparing magnesium chloride and polyvinyl alcohol into solutions, adding the magnesium chloride solution into the polyvinyl alcohol solution, and mixing the magnesium chloride solution with magnesium oxide to obtain the artificial composite board flame-retardant glue. The invention has high utilization rate of magnesium chloride, can save production time and reduce production cost.
Description
Technical Field
The invention relates to a preparation method of artificial composite board flame-retardant glue.
Background
The traditional artificial composite board uses an adhesive, and the production process comprises the steps of heating magnesium chloride, polyvinyl alcohol and water to dissolve the magnesium chloride and the polyvinyl alcohol, and then adding magnesium oxide. The operation is that of a water-soluble flame-retardant adhesive and a preparation method and application thereof, wherein the patent number is 201610396144.2. This has the following disadvantages: 1) the magnesium chloride and the polyvinyl alcohol are heated and dissolved together, the heating time is long, and the magnesium chloride is hydrolyzed, so that the utilization rate of the magnesium chloride is reduced; 2) magnesium oxide is added after the magnesium chloride and polyvinyl alcohol solution need to be cooled, the cooling time is long, and the yield is low; if the reaction time of magnesium chloride and magnesium oxide is too short without cooling, the early solidification is easy to cause loss; 3) because magnesium chloride and magnesium oxide are added in the production, the produced flame-retardant adhesive can only be used along with the production and cannot be used for transportation, thereby limiting the development of the flame-retardant adhesive.
At present, no flame-retardant adhesive for overcoming the three defects is available.
Disclosure of Invention
The invention provides a preparation method of an artificial composite board flame-retardant adhesive, which solves the technical problems that 1) the utilization rate of magnesium chloride is improved; the problem to be solved is 2) the cooling time is reduced, and the production efficiency is improved; problem 3) is to facilitate transportation.
In order to solve the technical problems, the invention adopts the following technical scheme:
the preparation method of the artificial composite board flame-retardant glue comprises the following steps of:
1) preparing magnesium chloride solution and preparing polyvinyl alcohol solution, namely adding magnesium chloride into water to dissolve to obtain magnesium chloride solution; adding polyvinyl alcohol into water, heating to 95-100 ℃, and stirring until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;
2) preparing a magnesium chloride-polyvinyl alcohol mixed solution: adding a magnesium chloride solution into a polyvinyl alcohol solution to obtain a mixed solution of magnesium chloride and polyvinyl alcohol;
3) preparing artificial composite board flame-retardant glue: weighing magnesium oxide, adding the magnesium oxide into the magnesium chloride-polyvinyl alcohol mixed solution, and uniformly mixing to obtain the artificial composite board flame-retardant adhesive.
The preparation method of the artificial composite board flame-retardant glue comprises the following steps of:
a) preparing magnesium chloride solution and preparing polyvinyl alcohol solution, namely adding magnesium chloride into water to dissolve to obtain magnesium chloride solution; adding polyvinyl alcohol into water, heating to 95-100 ℃, and stirring until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;
b) preparing a magnesium chloride-polyvinyl alcohol mixed solution: adding a magnesium chloride solution into a polyvinyl alcohol solution to obtain a mixed solution of magnesium chloride and polyvinyl alcohol;
c) preparing artificial composite board flame-retardant glue: weighing magnesium oxide, respectively and independently packaging the magnesium oxide and the magnesium chloride-polyvinyl alcohol mixed solution, and uniformly mixing the magnesium oxide and the magnesium chloride-polyvinyl alcohol mixed solution according to a certain proportion when in use to obtain the artificial composite board flame-retardant adhesive.
Preferably, the mass ratio of the magnesium chloride in the step 1) or the step a) to the water is 40-74: 100; the mass ratio of the polyvinyl alcohol to the water is 2-7: 100.
Preferably, the pH value of the magnesium chloride solution in the step 1) or the step a) is 3.5-4.5.
Preferably, the polyvinyl alcohol solution in step 2) or step b) is a cooled solution; after cooling, the temperature of the solution is 20-85 ℃; the mass ratio of the magnesium chloride solution to the polyvinyl alcohol solution is 1-3: 1-3.
Preferably, the temperature of the solution after temperature reduction in the step 2) or the step b) is 60-80 ℃.
Preferably, the mass ratio of the magnesium oxide to the magnesium chloride-polyvinyl alcohol mixed solution in the step 3) or the step c) is 1-3: 1-3.
Preferably, 5040 dispersing agent is added.
Preferably, a 5040 dispersing agent is added into a mixed solution of magnesium chloride and polyvinyl alcohol; 5040 the mass ratio of the dispersing agent to the polyvinyl alcohol mixed solution is 1-3: 1000.
Preferably, the pH of the mixed solution of magnesium chloride and polyvinyl alcohol in the step 2) or the step b) is 4.0-6.2.
The invention has the following beneficial technical effects:
1. the invention can improve the utilization rate of magnesium chloride and reduce the production cost of enterprises.
2. The invention reduces the cooling time and improves the production efficiency.
3. The invention solves the problems that the magnesium oxide board flame-retardant adhesive is prepared at any time and can not be stored and transported.
Detailed Description
The present invention is further illustrated by the following specific examples.
Example 1
The preparation method of the artificial composite board flame-retardant glue comprises the following steps of:
1) preparing magnesium chloride solution and preparing polyvinyl alcohol solution, namely adding magnesium chloride into water to dissolve to obtain magnesium chloride solution; adding polyvinyl alcohol into water, heating to 95-100 ℃, and stirring until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;
2) preparing a magnesium chloride-polyvinyl alcohol mixed solution: adding a magnesium chloride solution into a polyvinyl alcohol solution to obtain a mixed solution of magnesium chloride and polyvinyl alcohol;
3) preparing artificial composite board flame-retardant glue: weighing magnesium oxide, adding the magnesium oxide into the magnesium chloride-polyvinyl alcohol mixed solution, and uniformly mixing to obtain the artificial composite board flame-retardant adhesive.
The mass ratio of the magnesium chloride to the water in the step 1) is 50: 100; the mass ratio of polyvinyl alcohol to water was 6: 100.
The pH value of the magnesium chloride solution in the step 1) or the step a) is 6.1.
The polyvinyl alcohol solution in the step 2) is cooled; after the temperature is reduced, the temperature of the solution is 80 ℃; the mass ratio of the magnesium chloride solution to the polyvinyl alcohol solution is 1: 1.
The mass ratio of the magnesium oxide to the magnesium chloride-polyvinyl alcohol mixed solution in the step 3) is 1: 1.
Example 2
The preparation method of the artificial composite board flame-retardant glue comprises the following steps of:
1) preparing magnesium chloride solution and preparing polyvinyl alcohol solution, namely adding magnesium chloride into water to dissolve to obtain magnesium chloride solution; adding polyvinyl alcohol into water, heating to 95-100 ℃, and stirring until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;
2) preparing a magnesium chloride-polyvinyl alcohol mixed solution: adding a magnesium chloride solution into a polyvinyl alcohol solution to obtain a mixed solution of magnesium chloride and polyvinyl alcohol;
3) preparing artificial composite board flame-retardant glue: weighing magnesium oxide, adding the magnesium oxide into the magnesium chloride-polyvinyl alcohol mixed solution, and uniformly mixing to obtain the artificial composite board flame-retardant adhesive.
The mass ratio of the magnesium chloride to the water in the step 1) is 50: 100; the mass ratio of polyvinyl alcohol to water was 6: 100.
The pH value of the magnesium chloride solution in the step 1) or the step a) is 4.2.
The polyvinyl alcohol solution in the step 2) is cooled; after the temperature is reduced, the temperature of the solution is 80 ℃; the mass ratio of the magnesium chloride solution to the polyvinyl alcohol solution is 1: 1.
The mass ratio of the magnesium oxide to the magnesium chloride-polyvinyl alcohol mixed solution in the step 3) is 1: 1.
Example 3
The preparation method of the artificial composite board flame-retardant glue comprises the following steps of:
1) preparing magnesium chloride solution and preparing polyvinyl alcohol solution, namely adding magnesium chloride into water to dissolve to obtain magnesium chloride solution; adding polyvinyl alcohol into water, heating to 95-100 ℃, and stirring until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;
2) preparing a magnesium chloride-polyvinyl alcohol mixed solution: adding a magnesium chloride solution into a polyvinyl alcohol solution to obtain a mixed solution of magnesium chloride and polyvinyl alcohol;
3) preparing artificial composite board flame-retardant glue: weighing magnesium oxide, adding the magnesium oxide into the magnesium chloride-polyvinyl alcohol mixed solution, and uniformly mixing to obtain the artificial composite board flame-retardant adhesive.
The mass ratio of the magnesium chloride to the water in the step 1) is 50: 100; the mass ratio of polyvinyl alcohol to water was 6: 100.
The pH value of the magnesium chloride solution in the step 1) or the step a) is 4.2.
The polyvinyl alcohol solution in the step 2) is cooled; after the temperature is reduced, the temperature of the solution is 80 ℃; the mass ratio of the magnesium chloride solution to the polyvinyl alcohol solution is 1: 1.
The mass ratio of the magnesium oxide to the magnesium chloride-polyvinyl alcohol mixed solution in the step 3) is 1: 1.
Also comprises adding 5040 dispersing agent.
Adding a 5040 dispersing agent into a mixed solution of magnesium chloride and polyvinyl alcohol; 5040 the mass ratio of the dispersant to the polyvinyl alcohol mixed solution is 1.5: 1000.
The pH of the mixed solution of the magnesium chloride and the polyvinyl alcohol in the step 2) is 5.0.
Example 4
The preparation method of the artificial composite board flame-retardant glue comprises the following steps of:
1) preparing magnesium chloride solution and preparing polyvinyl alcohol solution, namely adding magnesium chloride into water to dissolve to obtain magnesium chloride solution; adding polyvinyl alcohol into water, heating to 95-100 ℃, and stirring until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;
2) preparing a magnesium chloride-polyvinyl alcohol mixed solution: adding a magnesium chloride solution into a polyvinyl alcohol solution to obtain a mixed solution of magnesium chloride and polyvinyl alcohol;
3) preparing artificial composite board flame-retardant glue: weighing magnesium oxide, adding the magnesium oxide into the magnesium chloride-polyvinyl alcohol mixed solution, and uniformly mixing to obtain the artificial composite board flame-retardant adhesive.
The mass ratio of the magnesium chloride to the water in the step 1) is 50: 100; the mass ratio of polyvinyl alcohol to water was 6: 100.
The pH value of the magnesium chloride solution in the step 1) or the step a) is 4.2.
The polyvinyl alcohol solution in the step 2) is cooled; after the temperature is reduced, the temperature of the solution is 80 ℃; the mass ratio of the magnesium chloride solution to the polyvinyl alcohol solution is 1: 1.
The mass ratio of the magnesium oxide to the magnesium chloride-polyvinyl alcohol mixed solution in the step 3) is 1: 1.
Also comprises adding 5040 dispersing agent.
Adding a 5040 dispersing agent into a mixed solution of magnesium chloride and polyvinyl alcohol; 5040 the mass ratio of the dispersant to the polyvinyl alcohol mixed solution is 1.5: 1000.
Adding a sodium hydroxide aqueous solution into the mixed solution of the magnesium chloride and the polyvinyl alcohol in the step 2), and adjusting the pH value to 6.5.
Example 5
The preparation method of the artificial composite board flame-retardant glue comprises the following steps of:
a) preparing magnesium chloride solution and preparing polyvinyl alcohol solution, namely adding magnesium chloride into water to dissolve to obtain magnesium chloride solution; adding polyvinyl alcohol into water, heating to 95-100 ℃, and stirring until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;
b) preparing a magnesium chloride-polyvinyl alcohol mixed solution: adding a magnesium chloride solution into a polyvinyl alcohol solution to obtain a mixed solution of magnesium chloride and polyvinyl alcohol;
c) preparing artificial composite board flame-retardant glue: weighing magnesium oxide, respectively and independently packaging the magnesium oxide and the magnesium chloride-polyvinyl alcohol mixed solution, and uniformly mixing the magnesium oxide and the magnesium chloride-polyvinyl alcohol mixed solution according to a certain proportion when in use to obtain the artificial composite board flame-retardant adhesive.
The mass ratio of the magnesium chloride to the water in the step a) is 50: 100; the mass ratio of polyvinyl alcohol to water was 6: 100.
The pH value of the magnesium chloride solution in the step a) is 4.2.
The polyvinyl alcohol solution in the step b) is cooled; after cooling, the temperature of the solution is 75 ℃; the mass ratio of the magnesium chloride solution to the polyvinyl alcohol solution is 1: 1.
The mass ratio of the magnesium oxide to the magnesium chloride-polyvinyl alcohol mixed solution in the step c) is 1: 1.
Also comprises adding 5040 dispersing agent.
5040 adding dispersant into the mixed solution of magnesium chloride and polyvinyl alcohol; 5040 the mass ratio of the dispersant to the polyvinyl alcohol mixed solution is 1.5: 1000.
The pH of the mixed solution of magnesium chloride and polyvinyl alcohol in the step b) is 5.0.
Example 6
The preparation method of the artificial composite board flame-retardant glue comprises the following steps of:
a) preparing magnesium chloride solution and preparing polyvinyl alcohol solution, namely adding magnesium chloride into water to dissolve to obtain magnesium chloride solution; adding polyvinyl alcohol into water, heating to 95-100 ℃, and stirring until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;
b) preparing a magnesium chloride-polyvinyl alcohol mixed solution: adding a magnesium chloride solution into a polyvinyl alcohol solution to obtain a mixed solution of magnesium chloride and polyvinyl alcohol;
c) preparing artificial composite board flame-retardant glue: weighing magnesium oxide, respectively and independently packaging the magnesium oxide and the magnesium chloride-polyvinyl alcohol mixed solution, and uniformly mixing the magnesium oxide and the magnesium chloride-polyvinyl alcohol mixed solution according to a certain proportion when in use to obtain the artificial composite board flame-retardant adhesive.
The mass ratio of the magnesium chloride to the water in the step a) is 30: 100; the mass ratio of the polyvinyl alcohol to the water is 5: 100.
The pH value of the magnesium chloride solution in the step a) is 4.0.
The polyvinyl alcohol solution in the step b) is cooled; after the temperature is reduced, the temperature of the solution is 30 ℃; the mass ratio of the magnesium chloride solution to the polyvinyl alcohol solution is 3: 1.
The mass ratio of the magnesium oxide to the magnesium chloride-polyvinyl alcohol mixed solution in the step c) is 2: 3.
Also comprises adding 5040 dispersing agent.
5040 adding dispersant into the mixed solution of magnesium chloride and polyvinyl alcohol; 5040 the mass ratio of the dispersant to the polyvinyl alcohol mixed solution is 2: 1000.
The pH of the mixed solution of magnesium chloride and polyvinyl alcohol in the step b) is 4.5.
Example 7
The preparation method of the artificial composite board flame-retardant glue comprises the following steps of:
1) preparing magnesium chloride solution and preparing polyvinyl alcohol solution, namely adding magnesium chloride into water to dissolve to obtain magnesium chloride solution; adding polyvinyl alcohol into water, heating to 95-100 ℃, and stirring until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;
2) preparing a magnesium chloride-polyvinyl alcohol mixed solution: adding a magnesium chloride solution into a polyvinyl alcohol solution to obtain a mixed solution of magnesium chloride and polyvinyl alcohol;
3) preparing artificial composite board flame-retardant glue: weighing magnesium oxide, adding the magnesium oxide into the magnesium chloride-polyvinyl alcohol mixed solution, and uniformly mixing to obtain the artificial composite board flame-retardant adhesive.
Example 8
The preparation method of the artificial composite board flame-retardant glue comprises the following steps of:
a) preparing magnesium chloride solution and preparing polyvinyl alcohol solution, namely adding magnesium chloride into water to dissolve to obtain magnesium chloride solution; adding polyvinyl alcohol into water, heating to 95-100 ℃, and stirring until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;
b) preparing a magnesium chloride-polyvinyl alcohol mixed solution: adding a magnesium chloride solution into a polyvinyl alcohol solution to obtain a mixed solution of magnesium chloride and polyvinyl alcohol;
c) preparing artificial composite board flame-retardant glue: weighing magnesium oxide, respectively and independently packaging the magnesium oxide and the magnesium chloride-polyvinyl alcohol mixed solution, and uniformly mixing the magnesium oxide and the magnesium chloride-polyvinyl alcohol mixed solution according to a certain proportion when in use to obtain the artificial composite board flame-retardant adhesive.
Example 9
The preparation method of the artificial composite board flame-retardant glue comprises the following steps of:
a) preparing magnesium chloride solution and preparing polyvinyl alcohol solution, namely adding magnesium chloride into water to dissolve to obtain magnesium chloride solution; adding polyvinyl alcohol into water, heating to 95-100 ℃, and stirring until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;
b) preparing a magnesium chloride-polyvinyl alcohol mixed solution: adding a magnesium chloride solution into a polyvinyl alcohol solution to obtain a mixed solution of magnesium chloride and polyvinyl alcohol;
c) preparing artificial composite board flame-retardant glue: weighing magnesium oxide, respectively and independently packaging the magnesium oxide and the magnesium chloride-polyvinyl alcohol mixed solution, and uniformly mixing the magnesium oxide and the magnesium chloride-polyvinyl alcohol mixed solution according to a certain proportion when in use to obtain the artificial composite board flame-retardant adhesive.
The mass ratio of the magnesium chloride to the water in the step a) is 4: 100; the mass ratio of polyvinyl alcohol to water was 4: 100.
The pH value of the magnesium chloride solution in the step a) is 3.6.
The polyvinyl alcohol solution in the step b) is cooled; after cooling, the temperature of the solution is 75 ℃; the mass ratio of the magnesium chloride solution to the polyvinyl alcohol solution is 1: 3.
The mass ratio of the magnesium oxide to the magnesium chloride-polyvinyl alcohol mixed solution in the step c) is 1: 2.
Also comprises adding 5040 dispersing agent.
5040 adding dispersant into the mixed solution of magnesium chloride and polyvinyl alcohol; 5040 the mass ratio of the dispersant to the polyvinyl alcohol mixed solution is 2: 1000.
The pH of the mixed solution of magnesium chloride and polyvinyl alcohol in the step b) is 4.8.
The beneficial effects of the present invention are further illustrated below in conjunction with experimental data:
experiment one
1. Experiment of
Test material
1, materials and methods:
1.1 test site: tatai City Baoxiangmu industries, Ltd.
1.2 test detection: the content of magnesium chloride.
1.3 test materials: a mixed solution of magnesium chloride and polyvinyl alcohol prepared in comparative example 1 (except that the process was a process in which magnesium chloride, polyvinyl alcohol and water were mixed and dissolved by heating, and other preparation methods were the same as those in example 1), a mixed solution of magnesium chloride and polyvinyl alcohol prepared in comparative example 2 (except that the process was a process in which magnesium chloride, polyvinyl alcohol and water were mixed and then adjusted to pH 4.2 and dissolved by heating, and other preparation methods were the same as those in example 2), a mixed solution of magnesium chloride and polyvinyl alcohol prepared in example 1, and a mixed solution of magnesium chloride and polyvinyl alcohol prepared in example 2.
1.4 detection standard: EDTA titration method.
The experiment was performed in a consistent manner except for the different test materials.
2 results and analysis
Magnesium chloride content, see table 1.
TABLE 1
| Sample (I) | Magnesium chloride content (%) |
| Example 1 | 48.65 |
| Example 2 | 49.24 |
| Comparative example 1 | 31.96 |
| Comparative example 2 | 43.73 |
As can be seen from table 1, the present application, which separately dissolves magnesium chloride and polyvinyl alcohol, can improve the utilization of magnesium chloride; both comparative example 2 and example 2 were pH adjusted, but the utilization of magnesium chloride was improved after heating comparative example 2, but still not as good as the present invention.
Experiment two
1. Experiment of
Test material
1, materials and methods:
1.1 test site: tatai City Baoxiangmu industries, Ltd.
1.2 test detection: cooling to normal temperature.
1.3 test materials: comparative example 1 (the preparation method was the same as example 1 except that the process was a method in which magnesium chloride, polyvinyl alcohol and water were mixed and dissolved by heating) and example 1.
1.4 detection standard: the cooling time from 100 ℃ to 40 ℃ was recorded.
The experiment was performed in a consistent manner except for the different test materials.
Note: the magnesium chloride is dissolved without heating, and the temperature after dissolution is 23 ℃ at room temperature; the cooling adopts circulating water for cooling.
2 results and analysis
The cooling time is shown in Table 2.
TABLE 2
| Sample (I) | Cooling time (min) |
| Example 1 | 27 |
| Comparative example 1 | 98 |
As can be seen from Table 2, the present invention can reduce the cooling time and improve the production efficiency.
Experiment three
1. Experiment of
Test material
1, materials and methods:
1.1 test site: tatai City Baoxiangmu industries, Ltd.
1.2 test detection: shear strength, recorded cure speed and cure phenomena.
1.3 test materials: comparative example 1 (preparation method was the same as example 1 except that the process was a process in which magnesium chloride, polyvinyl alcohol and water were mixed and dissolved by heating), example 1, example 2, example 3, example 4 and example 5.
1.4 detection standard: preparing a sample sheet, standing for 24 hours, and then testing according to the standard of tensile shear strength of GB/T7124-2008 adhesive, wherein in example 5, the sample sheet is prepared by uniformly mixing magnesium oxide and a magnesium chloride-polyvinyl alcohol mixed solution.
The experiment was performed in a consistent manner except for the different test materials.
2 results and analysis
Cure speed and shear strength, see table 3.
TABLE 3
| Speed of curing (min) | Shear strength (Mpa) | |
| Example 1 | 364 | 1.9 |
| Example 2 | 386 | 2.3 |
| Example 3 | 341 | 2.7 |
| Example 4 | 334 | 2.4 |
| Example 5 | 342 | 2.7 |
| Comparative example 1 | 457 | 1.2 |
Note: example 5 storage alone did not solidify; the magnesium oxide and the magnesium chloride-polyvinyl alcohol mixed solution are uniformly mixed and then cured.
As can be seen from Table 3 and the description thereof, in comparison 1, due to the low utilization rate of magnesium chloride, the magnesium oxide degree in the magnesium chloride is not enough during the reaction, the curing time is long, the shear strength is not enough, and the demoulding is not easy during the production; the present invention does not have such a phenomenon. As can be seen from the data of example 1 and example 2, slightly lowering the pH can properly delay the curing time, but later increase the shear strength; as can be seen from examples 3 and 4, the addition of the dispersant accelerates the curing and provides a higher strength after curing. The embodiment 5 shows that the invention can solve the problems that the reaction speed is high after the polyvinyl alcohol and the magnesium oxide in the flame-retardant cold-pressed adhesive are mixed, the mixture is solidified in a short time, and all enterprises are prepared at any time when using the flame-retardant cold-pressed adhesive and cannot store and transport the flame-retardant cold-pressed adhesive.
Experiment four
1. Experiment of
Test material
1, materials and methods:
1.1 test site: the national fire-proof building material quality supervision and inspection center.
1.2 test detection: burn growth rate index, heat release in 600s, flame transverse propagation length, flame tip height, whether the filter paper is lit, smoke generation rate index, total smoke production in 600s, burning drips/particles, smoke toxicity, grade and formaldehyde release.
1.3 test materials: flame retardant plywood type 2440mm 1220mm 18mm prepared in example 1 was used.
1.4 detection standard: GB 20286 flame retardant articles and Components for public places flammability requirements and identification.
The experiment was performed in a consistent manner except for the different test materials.
2 results and analysis
The results are shown in Table 4
TABLE 4
As can be seen from Table 4, the flame-retardant plywood prepared by the embodiment 1 of the invention can meet the requirements of national standard GB 20286 flame-retardant products and assemblies in public places on combustion performance and marks, and has the advantages of no formaldehyde release and excellent environmental protection performance.
Claims (7)
1. The preparation method of the artificial composite board flame-retardant glue comprises magnesium chloride, polyvinyl alcohol and magnesium oxide, and is characterized by comprising the following steps:
1) preparing magnesium chloride solution and preparing polyvinyl alcohol solution, namely adding magnesium chloride into water to dissolve to obtain magnesium chloride solution; adding polyvinyl alcohol into water, heating to 95-100 ℃, and stirring until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;
2) preparing a mixed solution of magnesium chloride and polyvinyl alcohol: adding a magnesium chloride solution into a polyvinyl alcohol solution to obtain a mixed solution of magnesium chloride and polyvinyl alcohol;
3) preparing artificial composite board flame-retardant glue: weighing magnesium oxide, adding the magnesium oxide into a mixed solution of magnesium chloride and polyvinyl alcohol, and uniformly mixing to obtain the artificial composite board flame-retardant adhesive;
also comprises adding 5040 dispersing agent;
adding a 5040 dispersing agent into a mixed solution of magnesium chloride and polyvinyl alcohol; 5040 the mass ratio of the dispersing agent to the polyvinyl alcohol mixed solution is 1-3: 1000;
the pH value of the magnesium chloride solution in the step 1) is 3.5-4.5.
2. The preparation method of the artificial composite board flame-retardant glue comprises magnesium chloride, polyvinyl alcohol and magnesium oxide, and is characterized by comprising the following steps:
a) preparing magnesium chloride solution and preparing polyvinyl alcohol solution, namely adding magnesium chloride into water to dissolve to obtain magnesium chloride solution; adding polyvinyl alcohol into water, heating to 95-100 ℃, and stirring until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol solution;
b) preparing a mixed solution of magnesium chloride and polyvinyl alcohol: adding a magnesium chloride solution into a polyvinyl alcohol solution to obtain a mixed solution of magnesium chloride and polyvinyl alcohol;
c) preparing artificial composite board flame-retardant glue: weighing magnesium oxide, respectively and independently packaging the magnesium oxide, magnesium chloride and polyvinyl alcohol mixed solution, and uniformly mixing the magnesium oxide, the magnesium chloride and the polyvinyl alcohol mixed solution according to a certain proportion when in use to obtain the artificial composite board flame-retardant adhesive;
also comprises adding 5040 dispersing agent;
adding a 5040 dispersing agent into a mixed solution of magnesium chloride and polyvinyl alcohol; 5040 the mass ratio of the dispersing agent to the polyvinyl alcohol mixed solution is 1-3: 1000;
the pH value of the magnesium chloride solution in the step a) is 3.5-4.5.
3. The preparation method of the artificial composite board flame-retardant adhesive according to claim 1 or 2, wherein the mass ratio of the magnesium chloride to the water in the step 1) or the step a) is 40-74: 100; the mass ratio of the polyvinyl alcohol to the water is 2-7: 100.
4. The method for preparing the flame retardant adhesive for the artificial composite board according to claim 1 or 2, wherein the polyvinyl alcohol solution in the step 2) or the step b) is a solution after being cooled; after cooling, the temperature of the solution is 20-85 ℃; the mass ratio of the magnesium chloride solution to the polyvinyl alcohol solution is 1-3: 1-3.
5. The preparation method of the artificial composite board flame-retardant adhesive according to claim 4, wherein the temperature of the solution after cooling in step 2) or step b) is 60-80 ℃.
6. The preparation method of the artificial composite board flame-retardant adhesive according to claim 1 or 2, wherein the mass ratio of the magnesium oxide to the magnesium chloride-polyvinyl alcohol mixed solution in the step 3) or the step c) is 1-3: 1-3.
7. The preparation method of the artificial composite board flame-retardant adhesive according to claim 1 or 2, wherein the pH of the mixed solution of magnesium chloride and polyvinyl alcohol in the step 2) or the step b) is 4.0-6.2.
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