CN111073058A - Special environment-friendly composite flame retardant for copper-clad plate and preparation method thereof - Google Patents
Special environment-friendly composite flame retardant for copper-clad plate and preparation method thereof Download PDFInfo
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- CN111073058A CN111073058A CN202010000257.2A CN202010000257A CN111073058A CN 111073058 A CN111073058 A CN 111073058A CN 202010000257 A CN202010000257 A CN 202010000257A CN 111073058 A CN111073058 A CN 111073058A
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/06—Pretreated ingredients and ingredients covered by the main groups C08K3/00 - C08K7/00
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- 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
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- C08K3/38—Boron-containing compounds
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- 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
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
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- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
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Abstract
The invention relates to the technical field of flame retardant processing, in particular to an environment-friendly composite flame retardant special for a copper-clad plate and a preparation method thereof. An environment-friendly composite flame retardant special for a copper-clad plate comprises a synergistic flame retardant, magnesium hydroxide and aluminum hydroxide; the magnesium hydroxide is superfine modified magnesium hydroxide; the aluminum hydroxide is superfine modified aluminum hydroxide; the mass ratio of the synergistic flame retardant, the superfine modified magnesium hydroxide and the superfine modified aluminum hydroxide is 1: (3-14): (2-8). The special environment-friendly composite flame retardant for the copper-clad plate, which is prepared by the invention, has higher cost performance, is environment-friendly and nontoxic, and can improve the flame retardant property and the mechanical property of the copper-clad plate.
Description
Technical Field
The invention belongs to the technical field of flame retardant processing, and particularly relates to an environment-friendly composite flame retardant special for a copper-clad plate and a preparation method thereof.
Background
With the development of science and technology, the electronic information industrialization revolution represented by computers and electronic products is more and more deeply advanced to various fields of social development, and with the more and more powerful functions and higher requirements on quality and reliability of the electronic products, the requirements on copper clad laminates and prepregs for printed circuit boards are also improved. Meanwhile, in order to reduce the fire hazard of electronic products and guarantee the safety of customers, the copper-clad plates in the traditional field mainly introduce halogen elements, most commonly bromides such as brominated epoxy resin and the like, into resin, however, when the halogen-containing electronic products are combusted, harmful substances such as hydrogen halide, aromatic compounds and the like can be released, the smoke quantity is large, and meanwhile, the waste electronic products also have the risks of environmental pollution and influence on the health of human beings and animals. Therefore, the development of the halogen-free flame-retardant copper-clad plate has very important environmental protection significance and economic significance for human survival. The inorganic flame retardant is a halogen-free flame retardant which is researched more by various copper-clad plate enterprises at present. The inorganic flame retardants are characterized by the respective characteristics, the flame retardant synergist and the flame retardant are compounded by fully utilizing the advantages of the inorganic flame retardants when the inorganic flame retardants are selected, the synergistic effect is exerted, the development is towards the trends of high efficiency, environmental protection and low cost, and the spheroidized crystal form is favorable for achieving higher volume filling rate, is favorable for formula design and exerts the best flame retardant performance.
Disclosure of Invention
In order to solve the problems, the invention provides a special environment-friendly composite flame retardant for a copper-clad plate, which comprises a synergistic flame retardant, magnesium hydroxide and aluminum hydroxide; the magnesium hydroxide is superfine modified magnesium hydroxide; the aluminum hydroxide is superfine modified aluminum hydroxide; the mass ratio of the synergistic flame retardant, the superfine modified magnesium hydroxide and the superfine modified aluminum hydroxide is 1: (3-14): (2-8).
As a preferable technical scheme, the mass ratio of the synergistic flame retardant, the superfine modified magnesium hydroxide and the superfine modified aluminum hydroxide is 1: (5-12): (4-6).
As a preferred technical scheme, the synergistic flame retardant is selected from one or more of organic phosphorus flame retardants, oxide flame retardants, borate flame retardants, stannate flame retardants, antimony flame retardants and silicon flame retardants.
As a preferable technical scheme, the synergistic flame retardant is a borate flame retardant.
As a preferred technical scheme, the borate type flame retardant is selected from one or more of zinc borate, barium borate, calcium borate, zinc metaborate and barium metaborate.
As a preferred technical solution, the borate type flame retardant is zinc borate; the zinc borate is ceramic zinc borate.
As a preferable technical scheme, the particle size of the ceramic zinc borate is 1-5 μm.
As a preferable technical scheme, the particle size of the superfine modified aluminum hydroxide is 1-7 μm.
As a preferable technical scheme, the particle size of the superfine modified magnesium hydroxide is 1-4 μm.
The second aspect of the invention provides a preparation method of the special environment-friendly composite flame retardant for the copper-clad plate, which comprises the following steps: the synergistic flame retardant, the superfine modified magnesium hydroxide and the superfine modified aluminum hydroxide are mixed according to a proportion and evenly stirred to prepare the special environment-friendly composite flame retardant for the copper-clad plate.
Has the advantages that: the environment-friendly composite flame retardant special for the copper-clad plate has high cost performance, is environment-friendly and nontoxic, and can be used for realizing mutual synergism and making up for the deficiencies of the superfine modified aluminum hydroxide, the superfine modified magnesium hydroxide and the synergistic flame retardant by compounding the superfine modified aluminum hydroxide, the superfine modified magnesium hydroxide and the synergistic flame retardant, so that the consumption of the flame retardant is reduced, and the flame retardant property and the mechanical property of the copper-clad plate are improved. Particularly used for ceramic-based copper clad laminates, the ceramic-based copper clad laminates can have better flame retardance and mechanical properties.
Detailed Description
The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
The term "prepared from …" as used herein is synonymous with "including". As used herein, the terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
The conjunction "consisting of …" excludes any unspecified elements, steps or components. If used in a claim, the phrase will render the claim closed except for the materials described, except for the conventional impurities associated therewith. When the phrase "consisting of …" appears in a clause of the subject matter of the claims rather than immediately after the subject matter, it defines only the elements described in the clause; other elements are not excluded from the claims as a whole.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. "optional" or "any" means that the subsequently described event or events may or may not occur, and that the description includes instances where the event occurs and instances where it does not.
Approximating language, as used herein in the specification and claims, is intended to modify a quantity, such that the invention is not limited to the specific quantity, but includes portions that are literally received by modifying or otherwise modifying such quantity without substantially changing the basic function to which it is related. Accordingly, the use of "about" to modify a numerical value means that the invention is not limited to the precise value. In some instances, the approximating language may correspond to the precision of an instrument for measuring the value. In the present description and claims, range limitations may be combined and/or interchanged, including all sub-ranges contained therein if not otherwise stated.
In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the stated number clearly indicates that the singular form is intended.
The invention provides a special environment-friendly composite flame retardant for a copper-clad plate, which comprises a synergistic flame retardant, magnesium hydroxide and aluminum hydroxide; the magnesium hydroxide is superfine modified magnesium hydroxide; the aluminum hydroxide is superfine modified aluminum hydroxide; the mass ratio of the synergistic flame retardant, the superfine modified magnesium hydroxide and the superfine modified aluminum hydroxide is 1: (3-14): (2-8).
In a preferred embodiment, the copper-clad plate special-purpose environment-friendly composite flame retardant comprises the following components in percentage by mass: (5-12): (4-6).
In a preferred embodiment, the copper-clad plate special-purpose environment-friendly composite flame retardant comprises the following components in percentage by mass: 8: 5.
synergistic flame retardant
The synergistic flame retardant disclosed by the invention has synergistic flame retardant and auxiliary anti-dripping effects.
In one embodiment, the synergistic flame retardant is selected from one or more of an organic phosphorus flame retardant, an oxide flame retardant, a borate flame retardant, a stannate flame retardant, an antimony flame retardant, and a silicon flame retardant.
In a preferred embodiment, the synergistic flame retardant is a borate type flame retardant.
In a preferred embodiment, the borate-type flame retardant is selected from a mixture of one or more of zinc borate, barium borate, calcium borate, zinc metaborate, and barium metaborate.
In a preferred embodiment, the borate-type flame retardant is zinc borate; the zinc borate is ceramic zinc borate.
In a preferred embodiment, the particle size of the ceramized zinc borate is 1 to 5 μm.
In a preferred embodiment, the particle size of the ceramized zinc borate is 3 μm.
The ceramic zinc borate is a unique zinc borate compound, can be melted at the temperature of over 600 ℃ to help form a vitrified ceramic membrane, and has the functions of smoke suppression, flame retardance, dripping resistance and relative tracking index improvement.
The ceramic zinc borate is purchased from scientific and technological corporation of Yishitong materials of Anhui, and the brand number is ZB-3.
Superfine modified magnesium hydroxide
The superfine modified magnesium hydroxide is obtained by modifying magnesium hydroxide micropowder.
In one embodiment, the preparation method of the ultrafine modified magnesium hydroxide comprises the following steps: putting the magnesium hydroxide micro powder into a stirrer, uniformly stirring and heating to 70-105 ℃, adding an ethanol solution of a surface modifier A into the powder by adopting a spraying method, wherein the ethanol solution of the surface modifier A accounts for 3-5% of the weight of the magnesium hydroxide micro powder, and uniformly stirring to obtain the magnesium hydroxide micro powder.
In a preferred embodiment, the surface-modifying agent a is selected from polyvinyl alcohol and/or fatty alcohol-polyoxyethylene ether.
In a preferred embodiment, the surface modifier a is fatty alcohol-polyoxyethylene ether.
In a preferred embodiment, the ethanol solution of the surface modifier A is prepared by dissolving the surface modifier A in the ethanol solution at a concentration of 3 mol/L.
In a preferred embodiment, the particle size of the ultra-fine modified magnesium hydroxide is 1 to 4 μm.
In a preferred embodiment, the ultrafine modified magnesium hydroxide has a particle size of 3 μm.
The inventor finds that the superfine modified magnesium hydroxide obtained by modifying the magnesium hydroxide with the fatty alcohol-polyoxyethylene ether has better flame retardant property through long-term research. The probable reason is that the fatty alcohol-polyoxyethylene ether reduces the polarity of the surface of the magnesium hydroxide crystal by adsorbing protons on the surface of the crystal or adhering to the surface of the crystal, effectively avoids agglomeration, reduces the bulk density, reduces the average particle size, increases the specific surface area and further increases the flame retardant property of the magnesium hydroxide crystal.
Superfine modified aluminium hydroxide
The superfine modified aluminum hydroxide is obtained by modifying aluminum hydroxide micropowder.
In one embodiment, the method for preparing the ultra-fine modified aluminum hydroxide comprises the following steps: putting the aluminum hydroxide micro powder into a stirrer, uniformly stirring and heating to 75-118 ℃, adding an ethanol solution of a surface modifier B into the powder by adopting a spraying method, wherein the ethanol solution of the surface modifier B accounts for 1-10% of the weight of the aluminum hydroxide micro powder, and uniformly stirring to obtain the aluminum hydroxide micro powder.
In a preferred embodiment, the surface modifier B is selected from one or more of titanate coupling agent, silane coupling agent, sodium stearate, zinc stearate, calcium stearate, magnesium stearate, sodium oleate, sodium dodecyl benzene sulfonate, aluminate ester, diphenyl phosphate, microcapsule-coated red phosphorus, rare earth modifier, dibutyl phthalate, dioctyl phthalate, calcium zinc complex modifier.
In a preferred embodiment, the surface modifier B is sodium stearate.
In a preferred embodiment, the ethanol solution of the surface modifier B is prepared by dissolving the surface modifier B in the ethanol solution at a concentration of 2.5 mol/L.
In a preferred embodiment, the ultrafine modified aluminum hydroxide has a particle size of 1 to 7 μm.
In a preferred embodiment, the ultrafine modified aluminum hydroxide has a particle size of 4 μm.
The second aspect of the invention provides a preparation method of the special environment-friendly composite flame retardant for the copper-clad plate, which comprises the following steps: the synergistic flame retardant, the superfine modified magnesium hydroxide and the superfine modified aluminum hydroxide are mixed according to a proportion and evenly stirred to prepare the special environment-friendly composite flame retardant for the copper-clad plate.
The mechanism is explained as follows: the inventor discovers that the flame retardant property and the mechanical property of the copper-clad plate can be improved by compounding the ceramic zinc borate, the superfine modified magnesium hydroxide and the superfine modified aluminum hydroxide in proportion as a composite flame retardant to be added into the copper-clad plate through long-term research. The possible reasons are that the carbon layer generated after the superfine modified magnesium hydroxide and the superfine modified aluminum hydroxide are combusted can isolate air so as to achieve a certain flame retardant effect, the internal carbon forming layer is in porous distribution, a large amount of magnesium oxide and aluminum oxide particles are adsorbed by internal holes, the specific surface area is increased, and the nano particle structure of the particles and the steam generated by heating can adsorb a large amount of smoke generated by combustion so as to achieve a remarkable smoke suppression effect; the ceramic zinc borate has good synergistic effect with the superfine magnesium hydroxide and the superfine aluminum hydroxide, and the ceramic zinc borate can adsorb surrounding high-molecular decomposed carbon residues and inorganic fillers to form a porous and hard insulating glass layer, so that the diffusion of smoke is inhibited, and the ceramic zinc borate is anti-dripping and fireproof. In addition, the inventor finds that the addition of the special environment-friendly composite flame retardant for the copper-clad plate can also increase the fire resistance grade, the mechanical property and the self-supporting property of the copper-clad plate, and particularly for the ceramic-based copper-clad plate, the fire resistance grade and the mechanical property are better.
Examples
In order to better understand the above technical solutions, the following detailed descriptions will be provided with reference to specific embodiments. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention. In addition, the raw materials are commercially available and the extraction methods of the extract are all conventional extraction methods, if not otherwise specified.
Example 1
Embodiment 1 provides a special environment-friendly composite flame retardant for copper-clad plates, which comprises a synergistic flame retardant, magnesium hydroxide and aluminum hydroxide; the magnesium hydroxide is superfine modified magnesium hydroxide; the aluminum hydroxide is superfine modified aluminum hydroxide; the mass ratio of the synergistic flame retardant, the superfine modified magnesium hydroxide and the superfine modified aluminum hydroxide is 1: 8: 5.
the synergistic flame retardant is ceramic zinc borate.
The grain size of the ceramic zinc borate is 3 mu m.
The preparation method of the superfine modified magnesium hydroxide comprises the following steps: putting the magnesium hydroxide micro powder into a stirrer, uniformly stirring and heating to 85 ℃, adding an ethanol solution of a surface modifier A into the powder by adopting a spraying method, wherein the ethanol solution of the surface modifier A accounts for 4% of the weight of the magnesium hydroxide micro powder, and uniformly stirring to obtain the magnesium hydroxide powder.
The surface modifier A is selected from polyvinyl alcohol and/or fatty alcohol-polyoxyethylene ether.
The surface modifier A is fatty alcohol-polyoxyethylene ether.
The ethanol solution of the surface modifier A is prepared by dissolving the surface modifier A in the ethanol solution, wherein the concentration is 3 mol/L.
The particle size of the superfine modified aluminum hydroxide is 4 mu m.
The particle size of the superfine modified magnesium hydroxide is 3 mu m.
The preparation method of the superfine modified aluminum hydroxide comprises the following steps: putting the aluminum hydroxide micro powder into a stirrer, uniformly stirring and heating to 93 ℃, adding an ethanol solution of a surface modifier B into the powder by adopting a spraying method, wherein the ethanol solution of the surface modifier B accounts for 5 percent of the weight of the aluminum hydroxide micro powder, and uniformly stirring to obtain the aluminum hydroxide powder.
The surface modifier B is sodium stearate.
In a preferred embodiment, the ethanol solution of the surface modifier B is prepared by dissolving the surface modifier B in the ethanol solution at a concentration of 2.5 mol/L.
The preparation method of the special environment-friendly composite flame retardant for the copper-clad plate comprises the following steps: the synergistic flame retardant, the superfine modified magnesium hydroxide and the superfine modified aluminum hydroxide are mixed according to a proportion and evenly stirred to prepare the special environment-friendly composite flame retardant for the copper-clad plate.
Example 2
Example 2 is essentially the same as example 1 except that it includes a synergistic flame retardant, magnesium hydroxide, aluminum hydroxide; the magnesium hydroxide is superfine modified magnesium hydroxide; the aluminum hydroxide is superfine modified aluminum hydroxide; the mass ratio of the synergistic flame retardant, the superfine modified magnesium hydroxide and the superfine modified aluminum hydroxide is 1: 5: 4.
example 3
Example 3 is essentially the same as example 1 except that it includes a synergistic flame retardant, magnesium hydroxide, aluminum hydroxide; the magnesium hydroxide is superfine modified magnesium hydroxide; the aluminum hydroxide is superfine modified aluminum hydroxide; the mass ratio of the synergistic flame retardant, the superfine modified magnesium hydroxide and the superfine modified aluminum hydroxide is 1: 12: 6.
comparative example 1
Comparative example 1 is substantially the same as example 1 except that it comprises the following raw materials in parts by weight: the synergistic flame retardant is zinc borate.
Comparative example 2
Comparative example 2 is essentially the same as example 1 except that both surface modifier a and surface modifier B are sodium stearate.
Evaluation of Performance
Testing of coating rate: the weight loss of the powder coated with the surface modifier at the decomposition temperature is firstly measured, the coating amount of a sample of unit mass is calculated according to the original weight and the weight of the sample after complete loss of ignition, and the coating rate n of the surface modifier on the surface of the sample is calculated after the specific surface area of the powder is known or measured.
n-coating ratio,%;
m is the coating amount of the surface of the magnesium hydroxide micro powder, g;
q-the molecular weight of the surface modifier molecule;
a0-cross-sectional area of surface modifier molecule;
Swspecific surface area of the coated powder.
The results of the coating rate tests for the examples and comparative examples are shown in the following table:
table 1 Performance test data of the environment-friendly composite flame retardant specially used for the copper-clad plate prepared in the examples and the comparative examples
| Item | Coating rate% |
| Example 1 | 99 |
| Example 2 | 98 |
| Example 3 | 98 |
| Comparative example 1 | 88 |
| Comparative example 2 | 80 |
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.
Claims (10)
1. An environment-friendly composite flame retardant special for a copper-clad plate is characterized by comprising a synergistic flame retardant, magnesium hydroxide and aluminum hydroxide; the magnesium hydroxide is superfine modified magnesium hydroxide; the aluminum hydroxide is superfine modified aluminum hydroxide; the mass ratio of the synergistic flame retardant, the superfine modified magnesium hydroxide and the superfine modified aluminum hydroxide is 1: (3-14): (2-8).
2. The environment-friendly composite flame retardant special for copper-clad plates according to claim 1, wherein the mass ratio of the synergistic flame retardant, the superfine modified magnesium hydroxide and the superfine modified aluminum hydroxide is 1: (5-12): (4-6).
3. The environment-friendly composite flame retardant special for copper-clad plates according to claim 1, wherein the synergistic flame retardant is selected from one or a mixture of more of an organic phosphorus flame retardant, an oxide flame retardant, a borate flame retardant, a stannate flame retardant, an antimony flame retardant and a silicon flame retardant.
4. The environment-friendly composite flame retardant special for copper-clad plates according to claim 3, wherein the synergistic flame retardant is a borate type flame retardant.
5. The environment-friendly composite flame retardant special for copper-clad plates according to claim 4, wherein the borate type flame retardant is one or a mixture of zinc borate, barium borate, calcium borate, zinc metaborate and barium metaborate.
6. The environment-friendly composite flame retardant special for copper-clad plates according to claim 5, wherein the borate type flame retardant is zinc borate; the zinc borate is ceramic zinc borate.
7. The environment-friendly composite flame retardant special for copper-clad plates according to claim 6, wherein the particle size of the ceramic zinc borate is 1-5 μm.
8. The environment-friendly composite flame retardant special for copper-clad plates according to claim 1, wherein the particle size of the superfine modified magnesium hydroxide is 1-4 μm.
9. The environment-friendly composite flame retardant special for copper-clad plates according to claim 1, wherein the particle size of the superfine modified aluminum hydroxide is 1-7 μm.
10. The preparation method of the special environment-friendly composite flame retardant for the copper-clad plate according to any one of claims 1 to 9, which is characterized by comprising the following steps: the synergistic flame retardant, the superfine modified magnesium hydroxide and the superfine modified aluminum hydroxide are mixed according to a proportion and evenly stirred to prepare the special environment-friendly composite flame retardant for the copper-clad plate.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113276454A (en) * | 2021-04-22 | 2021-08-20 | 江西新永海电子科技有限公司 | Preparation method of flame-retardant copper-clad plate |
| CN114316368A (en) * | 2021-12-30 | 2022-04-12 | 江西广源化工有限责任公司 | Preparation method of aluminum hydroxide/magnesium hydroxide composite inorganic flame retardant |
| CN114790394A (en) * | 2021-07-07 | 2022-07-26 | 合肥中科阻燃新材料有限公司 | Composite environment-friendly flame retardant for A-grade fireproof composite board and preparation method thereof |
| CN114907713A (en) * | 2021-07-12 | 2022-08-16 | 合肥中科阻燃新材料有限公司 | Aluminum-magnesium composite flame retardant and preparation method thereof |
-
2020
- 2020-01-02 CN CN202010000257.2A patent/CN111073058A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113276454A (en) * | 2021-04-22 | 2021-08-20 | 江西新永海电子科技有限公司 | Preparation method of flame-retardant copper-clad plate |
| CN114790394A (en) * | 2021-07-07 | 2022-07-26 | 合肥中科阻燃新材料有限公司 | Composite environment-friendly flame retardant for A-grade fireproof composite board and preparation method thereof |
| CN114907713A (en) * | 2021-07-12 | 2022-08-16 | 合肥中科阻燃新材料有限公司 | Aluminum-magnesium composite flame retardant and preparation method thereof |
| CN114316368A (en) * | 2021-12-30 | 2022-04-12 | 江西广源化工有限责任公司 | Preparation method of aluminum hydroxide/magnesium hydroxide composite inorganic flame retardant |
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Application publication date: 20200428 |