CN115216090A - Building template material and preparation method thereof - Google Patents

Building template material and preparation method thereof Download PDF

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Publication number
CN115216090A
CN115216090A CN202211023365.7A CN202211023365A CN115216090A CN 115216090 A CN115216090 A CN 115216090A CN 202211023365 A CN202211023365 A CN 202211023365A CN 115216090 A CN115216090 A CN 115216090A
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calcium carbonate
flame retardant
antioxidant
phosphorus
modified calcium
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CN115216090B (en
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郭世林
孙涛
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Foshan Xiangju New Material Co ltd
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Foshan Xiangju New Material Co ltd
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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
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • 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
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/05—Alcohols; Metal alcoholates
    • C08K5/053—Polyhydroxylic alcohols
    • 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
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/34—Heterocyclic compounds having nitrogen in the ring
    • C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
    • C08K5/3477—Six-membered rings
    • C08K5/3492—Triazines
    • C08K5/34922—Melamine; Derivatives thereof
    • 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
    • C08K5/00—Use of organic ingredients
    • C08K5/49—Phosphorus-containing compounds
    • C08K5/51—Phosphorus bound to oxygen
    • C08K5/52—Phosphorus bound to oxygen only
    • C08K5/521—Esters of phosphoric acids, e.g. of H3PO4
    • 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
    • C08K9/00—Use of pretreated ingredients
    • C08K9/10—Encapsulated ingredients
    • 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
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant

Abstract

The invention discloses a building template material and a preparation method thereof, and relates to the field of building templates. The building template material comprises 100 parts by weight of polypropylene, 15-20 parts by weight of phosphorus-nitrogen expansion halogen-free flame retardant, 8-12 parts by weight of modified calcium carbonate and 0.8-1.2 parts by weight of antioxidant, wherein the modified calcium carbonate is specifically calcium carbonate with the surface coated with silicon dioxide. The method solves the problem that the flame retardant efficiency of calcium carbonate and phosphorus-nitrogen system intumescent halogen-free flame retardant which are used simultaneously is reduced, and can obtain the building template material with better tensile strength and flame retardant property.

Description

Building template material and preparation method thereof
Technical Field
The invention relates to the field of building templates, in particular to a building template material and a preparation method thereof.
Background
At present, the main use of wooden forms in building houses is wood formwork. However, the use of wood formwork in large quantities brings about a number of disadvantages. For example, the wood template has short service life and high replacement frequency, not only can consume a great deal of forest resources, but also is easy to generate a great deal of waste, and is not in accordance with the sustainable development concept.
In order to reduce the consumption of forest resources, plastic building templates come along. The PP plastic building template is a common novel building material at present, and in order to improve the flame retardant property and strength of the PP plastic building template, a flame retardant and a filler are usually added into the PP plastic building template. Wherein, the phosphorus-nitrogen expansion halogen-free flame retardant is a relatively environment-friendly halogen-free flame retardant which is commonly used for PP plastic building templates. Calcium carbonate is one of the common fillers, and is also often used as a reinforcing filler for PP plastic building forms.
However, the inventor finds that when the phosphorus-nitrogen intumescent halogen-free flame retardant is used as the flame retardant of the PP plastic building template, if the calcium carbonate filler is added, the flame retardant performance of the PP plastic building template is obviously reduced, namely the flame retardant efficiency of the phosphorus-nitrogen intumescent halogen-free flame retardant is obviously reduced.
Disclosure of Invention
In order to solve the problem that the flame retardant efficiency of calcium carbonate and phosphorus-nitrogen intumescent halogen-free flame retardant is reduced when the phosphorus-nitrogen intumescent halogen-free flame retardant is used simultaneously in the related technology, the application provides a building template material and a preparation method thereof.
In a first aspect, the present application provides a building template material, which adopts the following technical scheme:
the building template material comprises the following raw materials in parts by weight:
polypropylene: 100 portions of
Phosphorus-nitrogen expansion halogen-free flame retardant: 15-20 parts of
Modified calcium carbonate: 8 to 12 portions of
Antioxidant: 0.8 to 1.2 portions of
The modified calcium carbonate is calcium carbonate with the surface coated with silicon dioxide.
The phosphorus-nitrogen expansion halogen-free flame retardant generally consists of an acid source, a carbon source and a gas source. Wherein, the carbon source is mainly polyhydroxy compounds, such as pentaerythritol, starch, organic resin containing polyhydroxy and the like; the acid source is a substance capable of promoting dehydration and carbonization of polyhydroxy compounds in the combustion process, and mainly comprises inorganic acid salts and inorganic acid esters, such as ammonium phosphate, borate and silicate; the gas source is a compound which can emit a large amount of non-combustible non-toxic gas when being heated, and the gas released by heating can expand and foam the organism. Such compounds include melamine, ammonium polyphosphate, ammonium borate, and the like.
Aiming at the problem that the flame retardant efficiency of the phosphorus-nitrogen intumescent halogen-free flame retardant is easy to be reduced when calcium carbonate and the phosphorus-nitrogen intumescent halogen-free flame retardant are simultaneously used in the related technology, the inventor guesses that the reason is that calcium carbonate can react with an acid source in the phosphorus-nitrogen intumescent halogen-free flame retardant, so that the dehydration and carbonization process of a polyhydroxy compound is hindered, and the flame retardant efficiency of the phosphorus-nitrogen intumescent halogen-free flame retardant is influenced.
In this regard, the inventors have adopted the modified calcium carbonate of the present application in place of the ordinary calcium carbonate. Wherein, modified calcium carbonate in this application is the calcium carbonate that the surface cladding has silicon dioxide. Under the coating effect of the silicon dioxide, the calcium carbonate cannot react with an acid source in the phosphorus-nitrogen expansion halogen-free flame retardant, so that the acid source, a carbon source and an air source in the phosphorus-nitrogen expansion halogen-free flame retardant can synergistically exert a good flame retardant effect.
Optionally, the preparation method of the modified calcium carbonate comprises the following steps:
s1, dropwise adding 8L of 0.1-0.3mol/L sodium carbonate solution into 5L0.1-0.3mol/L calcium chloride solution, dropwise adding alkali liquor to slowly adjust the pH value to 9-10, controlling the system temperature to be 80-85 ℃, and introducing a mixture of sodium carbonate and calcium chloride in a volume ratio of 1: (3-4) CO 2 And N 2 Reacting the mixed gas for 1.5 to 2 hours; cooling to 50-55 deg.C, stopping introducing the mixed gas, and aging for 1-2 hr;
and S2, while introducing the mixed gas, slowly adding 2-3L of 0.4-0.5mol/L sodium silicate solution into the system after the aging of S1 is completed, stopping introducing the mixed gas after the addition of the sodium silicate solution is completed, aging for 3-4h, cooling to room temperature, filtering, washing and drying to obtain the modified calcium carbonate.
Compared with the preparation of modified calcium carbonate by directly dripping sodium silicate solution into calcium carbonate dispersion slurry, the modified calcium carbonate prepared by the method can not obviously reduce the flame retardant efficiency of the phosphorus-nitrogen expansion halogen-free flame retardant, and can further improve the tensile strength and the impact resistance of the building template material. In addition, the inventor finds that in S1, after the reaction is finished, the temperature is reduced to 50-55 ℃ for aging, which is a key factor for improving the tensile strength and the impact resistance of the building template material simultaneously.
Optionally, when the temperature in the S1 is reduced to 50-55 ℃, the temperature reduction speed is controlled to be 0.1-0.2 ℃/min.
In the process of cooling to 50-55 ℃, the cooling speed is controlled to be 0.1-0.2 ℃/min, and the obtained modified calcium carbonate is beneficial to further improving the shock resistance of the building template material.
Optionally, the flow rate of the mixed gas in the S1 and the S2 is 4-6m/S.
The purpose of introducing the mixed gas is to convert calcium hydroxide in the system into calcium carbonate without causing excessive fluctuation to pH. When the flow rate of the mixed gas is controlled to be 4-6m/s, gas stirring can be used for replacing mechanical stirring, so that the problem that the calcium carbonate generation structure is damaged by mechanical stirring is solved, and the impact resistance of the building template material can be improved while the tensile strength of the building template material is improved by the modified calcium carbonate.
Optionally, the adding speed of the sodium silicate solution in the S2 is controlled to be 40-50mL/min.
When the adding speed of the sodium silicate solution is controlled to be 40-50mL/min, the silicon dioxide can be promoted to be uniformly coated on the surface of the calcium carbonate, and the flame retardant property of the building template material is further improved.
Optionally, after aging in the step S2, adding a silane coupling agent-ethanol solution, heating and refluxing for 1-2h, cooling to room temperature, filtering, washing and drying to obtain the modified calcium carbonate.
And (2) after the silane coupling agent-ethanol solution is added into the S2 and heated and refluxed, the compatibility of the modified calcium carbonate and the polypropylene can be improved, the modified calcium carbonate is promoted to be uniformly dispersed into the polypropylene, and the tensile strength and the impact resistance of the building template material are further improved.
Optionally, the phosphorus-nitrogen intumescent halogen-free flame retardant comprises phosphate, pentaerythritol and melamine, wherein the weight ratio of the phosphate to the pentaerythritol to the melamine is (3.5-4.5): (1.8-2.2): 1.
the weight ratio of the phosphate, the pentaerythritol and the melamine is (3.5-4.5): (1.8-2.2): 1, the phosphorus-nitrogen expansion halogen-free flame retardant can exert a better flame retardant effect synergistically, and the building template material has a better flame retardant effect.
Optionally, the phosphorus-nitrogen intumescent halogen-free flame retardant comprises phosphate, pentaerythritol and melamine, wherein the weight ratio of the phosphate to the pentaerythritol to the melamine is 4:2:1.
the weight ratio of the phosphate, the pentaerythritol and the melamine is 4:2:1, the building template material has the best flame retardant effect.
Optionally, the antioxidant comprises antioxidant 1010 and antioxidant 168, and the weight ratio of the antioxidant 1010 to the antioxidant 168 is 3:2.
The antioxidant 1010 is very low in volatility and is effective in preventing thermo-oxidative degradation of the polymer material. The antioxidant 168 can effectively decompose the hydroperoxide generated during the thermal processing of the polymer material, so the compounding of the antioxidant 1010 and the antioxidant 168 can improve the stability of the polymer material during the processing.
In a second aspect, the present application provides a method for preparing a building template material, which adopts the following scheme:
a preparation method of a building template material comprises the following steps:
uniformly mixing polypropylene, a phosphorus-nitrogen expansion halogen-free flame retardant, modified calcium carbonate and an antioxidant according to a ratio to obtain a premix;
melting the premix at 195-205 ℃, and then extruding and granulating to obtain the building template material.
When the building template material is prepared by adopting the method, the phosphorus-nitrogen expansion halogen-free flame retardant, the modified calcium carbonate and the antioxidant can be promoted to be uniformly dispersed into the polypropylene, and the method also has the advantages of simple process steps and convenience in operation.
In summary, the present application includes at least the following beneficial effects:
the modified calcium carbonate can improve the tensile property of the building template material, and can solve the problem that the flame retardant efficiency of the phosphorus-nitrogen expansion halogen-free flame retardant is easy to reduce when the common calcium carbonate is directly added. The building template material has good tensile property and good flame retardant property.
Detailed Description
Aiming at the problem that the flame retardant efficiency of calcium carbonate and phosphorus-nitrogen expansion halogen-free flame retardant which are used simultaneously is reduced, the inventor adopts the modified calcium carbonate to replace the common calcium carbonate. Wherein the modified calcium carbonate is specifically calcium carbonate with the surface coated with silicon dioxide. Preferably modified calcium carbonate prepared by the following preparation method:
s1, dropwise adding 8L of 0.1-0.3mol/L sodium carbonate solution into 5L of 0.1-0.3mol/L calcium chloride solution, dropwise adding alkali liquor to slowly adjust the pH value to 9-10, controlling the temperature of the system to be 80-85 ℃, and introducing a mixed solution of sodium carbonate and water according to a volume ratio of 1: CO of (3-4) 2 And N 2 Reacting for 1.5-2h; cooling to 50-55 deg.C, stopping introducing the mixed gas, and aging for 1-2 hr;
and S2, while introducing the mixed gas, slowly adding 2-3L of 0.4-0.5mol/L sodium silicate solution into the system after the aging of S1 is completed, stopping introducing the mixed gas after the addition of the sodium silicate solution is completed, aging for 3-4h, cooling to room temperature, filtering, washing and drying to obtain the modified calcium carbonate.
Compared with the preparation of modified calcium carbonate by directly dripping sodium silicate solution into calcium carbonate dispersion slurry, the modified calcium carbonate prepared by the method can not obviously reduce the flame retardant efficiency of the phosphorus-nitrogen expansion halogen-free flame retardant, and can further improve the impact resistance of the building template material.
Preferably, when the temperature in the S1 is reduced to 50-55 ℃, the temperature reduction speed is controlled to be 0.1-0.2 ℃/min, which is beneficial to further improving the shock resistance of the building template material.
Preferably, the flow rate of the mixed gas in S1 and S2 is 4-6m/S. Wherein, the velocity of flow of letting in of mist is undersize, is difficult to play the stirring effect, and mist lets in the velocity of flow and destroys the formation structure of calcium carbonate easily too fast. And when the flow rate of the mixed gas is controlled to be 4-6m/s, gas stirring can be used for replacing mechanical stirring, so that the problem that the calcium carbonate generation structure is damaged by mechanical stirring is prevented, and the tensile strength of the building template material can be improved and the impact resistance of the building template material can be improved by the modified calcium carbonate.
Preferably, the adding speed of the sodium silicate solution in the S2 is controlled to be 40-50mL/min, so that the silicon dioxide can be promoted to be uniformly coated on the surface of the calcium carbonate, and the flame retardant property of the building template material is further improved.
In addition, the application also provides a building template material which comprises 100 parts by weight of polypropylene, 15-20 parts by weight of phosphorus-nitrogen expansion halogen-free flame retardant, 8-12 parts by weight of modified calcium carbonate and 0.8-1.2 parts by weight of antioxidant.
The building template material adopts the modified calcium carbonate to replace the common calcium carbonate, improves the tensile strength of the building template material, improves the flame retardant efficiency of the phosphorus-nitrogen expansion halogen-free flame retardant, and solves the pain problem in the industry.
Preferably, the phosphorus-nitrogen intumescent halogen-free flame retardant comprises phosphate ester, pentaerythritol and melamine, wherein the weight ratio of the phosphate ester to the pentaerythritol to the melamine is (3.5-4.5): (1.8-2.2): 1, the phosphorus-nitrogen expansion halogen-free flame retardant is beneficial to cooperatively playing a better flame retardant effect, and the building template material has a better flame retardant effect.
More preferably, the phosphorus-nitrogen intumescent halogen-free flame retardant comprises phosphate ester, pentaerythritol and melamine, wherein the weight ratio of the phosphate ester to the pentaerythritol to the melamine is 4:2:1, the building template material has the best flame retardant effect.
Correspondingly, the application also provides a preparation method of the building template material, which comprises the following steps:
uniformly mixing polypropylene, a phosphorus-nitrogen expansion halogen-free flame retardant, modified calcium carbonate and an antioxidant according to a ratio to obtain a premix;
and melting the premix at 195-205 ℃, and then extruding and granulating to obtain the building template material.
The following are specific preparation examples, examples and comparative examples.
Preparation example
Preparation example 1
A modified calcium carbonate is prepared by the following steps:
50g of calcium carbonate powder was dispersed in 200mL of water, and the pH was adjusted to 9 to 10, followed by introducing a solution of 1: (3-4) CO 2 And N 2 The 2L 0.4mol/L sodium silicate solution is slowly added into the mixed gas, after the sodium silicate solution is added, the mixed gas is stopped from being introduced, the mixed gas is aged for 3 to 4 hours, then the mixed gas is cooled to the room temperature, and then the modified calcium carbonate is obtained through filtering, washing and drying.
Preparation example 2
A modified calcium carbonate which differs from preparation example 1 in that:
the calcium carbonate is replaced by equal amount of calcium carbonate crystal whisker.
Preparation example 3
A modified calcium carbonate is prepared by the following steps:
s1, dripping a sodium carbonate solution 8L 0.3mol/L into a calcium chloride solution 5L 0.3mol/L, dripping sodium hydroxide alkali liquor to slowly regulate the pH value to 9-10, controlling the temperature of a system to be 85 ℃, and introducing a mixed solution with a volume ratio of 1:4 CO 2 And N 2 The flow rate of the mixed gas is 4m/s, and the mixed gas reacts for 2 hours;
and S2, introducing mixed gas, slowly adding 2L 0.4mol/L sodium silicate solution into a system after the reaction of the S1 is completed, wherein the introduction flow rate of the mixed gas is 4m/S, the addition speed of the sodium silicate solution is controlled at 60mL/min, stopping introducing the mixed gas after the addition of the sodium silicate solution is completed, aging for 3h, cooling to room temperature, and filtering, washing and drying to obtain the modified calcium carbonate.
Preparation example 4
A modified calcium carbonate which differs from preparation example 3 in that:
after reacting for 2 hours in the S1, cooling to 50 ℃ at a cooling speed of 0.5 ℃/min, stopping introducing the mixed gas, and aging for 1 hour;
and (3) adding the sodium silicate solution in the S2 into the system after the aging of the S1 is finished.
Preparation example 5
A modified calcium carbonate which differs from preparation example 4 in that:
and (2) after the aging is finished in the S2, adding 200g of silane coupling agent-ethanol solution, heating and refluxing for 1.5h, cooling to room temperature, filtering, washing and drying to obtain the modified calcium carbonate.
Wherein the silane coupling agent-ethanol solution is prepared by mixing 5g of silane coupling agent KH550 with 50g of ethanol solution with the volume fraction of 5%.
Examples
Example 1
A building template material comprises the following raw materials in parts by weight:
polypropylene: 100kg of
15kg of phosphorus-nitrogen expansion halogen-free flame retardant
Modified calcium carbonate prepared in preparation example 1: 8kg of
Antioxidant 0.8kg
The phosphorus-nitrogen intumescent halogen-free flame retardant comprises phosphate, pentaerythritol and melamine, wherein the weight ratio of the phosphate to the pentaerythritol to the melamine is 3.5:2.2:1;
the antioxidant comprises antioxidant 1010 and antioxidant 168, and the weight ratio of the antioxidant 1010 to the antioxidant 168 is 3:2.
The preparation method of the building template material comprises the following steps:
uniformly mixing polypropylene, phosphorus-nitrogen expansion halogen-free flame retardant, modified calcium carbonate, antioxidant 1010 and antioxidant 168 according to the proportion to obtain a premix;
and putting the premix into an extruder, setting the temperature of the extruder at 195-205 ℃, melting, extruding and granulating to obtain the building template material.
Example 2
A building formwork material, differing from example 1 in that: the proportion of each component is different.
The proportion of each component of the building template material in the embodiment is as follows:
polypropylene: 100kg of
15kg of phosphorus-nitrogen expansion halogen-free flame retardant
Modified calcium carbonate prepared in preparation example 1: 8kg of
Antioxidant 0.8kg.
Example 3
A building formwork material, differing from example 1 in that:
the modified calcium carbonate obtained in preparation example 1 was replaced with the modified calcium carbonate obtained in preparation example 2 in the same amount.
Example 4
A building formwork material, differing from example 1 in that:
the modified calcium carbonate obtained in preparation example 1 was replaced with the modified calcium carbonate obtained in preparation example 3 in the same amount.
Example 5
A building formwork material, differing from example 1 in that:
the modified calcium carbonate obtained in preparation example 1 was replaced with the modified calcium carbonate obtained in preparation example 4 in the same amount.
Example 6
A building formwork material, differing from example 1 in that:
the modified calcium carbonate obtained in preparation example 1 was replaced with the modified calcium carbonate obtained in preparation example 5 in the same amount.
Comparative example
Comparative example 1
A building template material, namely a polypropylene raw material.
Comparative example 2
A building formwork material, differing from example 1 in that:
the modified calcium carbonate prepared in preparation example 1 was replaced with an equal amount of calcium carbonate.
Comparative example 3
A building formwork material, differing from comparative example 1 in that:
no calcium carbonate was added.
Performance test data
(1) And (3) a limit oxygen index test, namely measuring the limit oxygen index of the PP sample strip by adopting a JF-3 limit oxygen index tester according to the test method specified in GB/T2406-2008. Wherein, the larger the limit oxygen index is, the better the flame retardant effect of the sample strip is.
And (3) vertical burning test, namely performing vertical burning test on the sample strip by adopting a horizontal vertical burning tester according to a test method specified in GB/T2408-2021. If 0<t is less than or equal to 10s and the absorbent cotton is not ignited, the vertical burning grade is UL-94V-0 grade, t is less than or equal to 30s and the absorbent cotton is not ignited, the vertical burning grade is UL-94V-1 grade, t is less than or equal to 30s, the absorbent cotton can be ignited, and the vertical burning grade is UL-94V-2 grade.
And (3) testing the tensile property of the sample strip by using a high-low temperature tensile testing machine according to the relevant standards in GB/T1040.1-2006.
And (3) testing the sample strip by using an impact testing machine according to the relevant standard of the cantilever notch impact test in GB/T1843-2008.
TABLE 1 Properties of sample strips produced from the building form materials of examples 1-6 and comparative examples 1-3
Figure BDA0003814926060000071
Figure BDA0003814926060000081
It can be seen from the data in Table 1 in combination with comparative examples 1 to 3 that when only the phosphorus-nitrogen based intumescent halogen-free flame retardant and the antioxidant are added to the polypropylene, the limiting oxygen index of the building template material is increased and the vertical burning grade is changed from V-2 to V-1, so that the phosphorus-nitrogen based intumescent halogen-free flame retardant can improve the flame retardant property of the polypropylene. However, when calcium carbonate and phosphorus-nitrogen intumescent halogen-free flame retardant are simultaneously doped into polypropylene, the flame retardant performance of the building template material is not much different from that of the polypropylene raw material, which indicates that the flame retardant efficiency of the phosphorus-nitrogen intumescent halogen-free flame retardant is reduced by directly adding calcium carbonate.
Combining examples 1-6 with comparative example 2 and combining the data in table 1, it can be seen that when the modified calcium carbonate coated with silica on the surface of the present application is used to replace the common calcium carbonate, the flame retardant property of the building template material can be effectively improved, and the problem that when the calcium carbonate is directly doped to improve the flame retardant property of the building template material, the flame retardant property of the building template material is easily reduced is solved.
Combining example 1 with examples 3-5 and the data in table 1, it can be seen that the modified calcium carbonate prepared in preparation examples 1-3 does not reduce the flame retardant efficiency of the phosphorus-nitrogen based intumescent halogen-free flame retardant, but does not improve the impact resistance of the building formwork material. The modified calcium carbonate prepared in the preparation example 4 can not only improve the flame retardant efficiency of the phosphorus-nitrogen expansion halogen-free flame retardant, but also improve the impact resistance of the building template material.
Combining the data in table 1 with the data in example 5 and example 6, it can be seen that adding the silane coupling agent to modify the calcium carbonate is beneficial to further improving the dispersibility of the modified calcium carbonate, thereby further improving the compressive strength and the impact resistance of the building template material.

Claims (10)

1. A building formwork material, characterized in that: the feed comprises the following raw materials in parts by weight:
polypropylene: 100 portions of
Phosphorus-nitrogen expansion halogen-free flame retardant: 15-20 parts of
Modified calcium carbonate: 8 to 12 portions of
Antioxidant: 0.8 to 1.2 portions of
The modified calcium carbonate is calcium carbonate with the surface coated with silicon dioxide.
2. The building formwork material defined in claim 1, wherein: the preparation method of the modified calcium carbonate comprises the following steps:
s1, dropwise adding 8L of 0.1-0.3mol/L sodium carbonate solution into 5L of 0.1-0.3mol/L calcium chloride solution, dropwise adding alkali liquor to slowly adjust the pH value to 9-10, controlling the temperature of the system to be 80-85 ℃, and introducing a mixed solution of sodium carbonate and water according to a volume ratio of 1: (3-4) reacting the mixed gas of CO2 and N2 for 1.5-2h; cooling to 50-55 deg.C, stopping introducing the mixed gas, and aging for 1-2 hr;
and S2, while introducing the mixed gas, slowly adding 2-3L of 0.04-0.05mol/L sodium silicate solution into the system after the aging of S1 is completed, stopping introducing the mixed gas after the addition of the sodium silicate solution is completed, aging for 3-4h, cooling to room temperature, filtering, washing and drying to obtain the modified calcium carbonate.
3. The building formwork material defined in claim 2, wherein: and when the temperature in the S1 is reduced to 50-55 ℃, the temperature reduction speed is controlled to be 0.1-0.2 ℃/min.
4. The building formwork material defined in claim 2, wherein: the flow velocity of the mixed gas in the S1 and the S2 is 4-6m/S.
5. The building formwork material defined in claim 2, wherein: and the adding speed of the sodium silicate solution in the S2 is controlled to be 40-50mL/min.
6. The building formwork material defined in claim 2, wherein: and (2) after the aging is finished in the S2, adding a silane coupling agent-ethanol solution, heating and refluxing for 1-2h, cooling to room temperature, filtering, washing and drying to obtain the modified calcium carbonate.
7. The building formwork material defined in claim 1, wherein: the phosphorus-nitrogen intumescent halogen-free flame retardant comprises phosphate, pentaerythritol and melamine, wherein the weight ratio of the phosphate to the pentaerythritol to the melamine is (3.5-4.5): (1.8-2.2): 1.
8. the building formwork material defined in claim 7, wherein: the phosphorus-nitrogen intumescent halogen-free flame retardant comprises phosphate, pentaerythritol and melamine, wherein the weight ratio of the phosphate to the pentaerythritol to the melamine is 4:2:1.
9. the building form material of claim 1, wherein: the antioxidant comprises an antioxidant 1010 and an antioxidant 168, and the weight ratio of the antioxidant 1010 to the antioxidant 168 is 3:2.
10. A method of making a building formwork material as claimed in any one of claims 1 to 9, comprising the steps of:
uniformly mixing the regenerated polypropylene, the phosphorus-nitrogen expansion halogen-free flame retardant, the modified calcium carbonate and the antioxidant according to the proportion to obtain a premix;
and melting the premix at 195-205 ℃, and then extruding and granulating to obtain the building template material.
CN202211023365.7A 2022-08-25 2022-08-25 Building template material and preparation method thereof Active CN115216090B (en)

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