CN115216090B - Building template material and preparation method thereof - Google Patents

Building template material and preparation method thereof Download PDF

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Publication number
CN115216090B
CN115216090B CN202211023365.7A CN202211023365A CN115216090B CN 115216090 B CN115216090 B CN 115216090B CN 202211023365 A CN202211023365 A CN 202211023365A CN 115216090 B CN115216090 B CN 115216090B
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calcium carbonate
flame retardant
building template
template material
phosphorus
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CN115216090A (en
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郭世林
孙涛
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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

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Fireproofing Substances (AREA)

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 silicon dioxide coated on the surface. The method solves the problem that the flame retardant efficiency of the calcium carbonate and the phosphorus-nitrogen expansion halogen-free flame retardant is reduced when the calcium carbonate and the phosphorus-nitrogen expansion halogen-free flame retardant are used simultaneously, 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, wood forms are mainly used for building houses. However, the use of wood forms in large quantities presents a number of drawbacks. For example, the wood template has short service life and high replacement frequency, not only can consume a large amount of forest resources, but also can easily generate a large amount of wastes, and does not conform to the sustainable development concept.
In order to reduce the consumption of forest resources, plastic building templates are produced. The PP plastic building template is a novel building material which is common 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. The phosphorus-nitrogen expansion halogen-free flame retardant is a relatively environment-friendly halogen-free flame retardant, and is a flame retardant commonly used for PP plastic building templates. Calcium carbonate is one of the common fillers and is also commonly used as a reinforcing filler for PP plastic building templates.
However, the inventors found that when a phosphorus-nitrogen based intumescent halogen-free flame retardant is used as a flame retardant for PP plastic building templates, if calcium carbonate filler is incorporated, the flame retardant performance of PP plastic building templates will be significantly reduced, i.e. the flame retardant efficiency of the phosphorus-nitrogen based intumescent halogen-free flame retardant will be significantly reduced.
Disclosure of Invention
In order to solve the problem that the flame retardant efficiency of the calcium carbonate and the phosphorus-nitrogen expansion halogen-free flame retardant is easy to be reduced when the calcium carbonate and the phosphorus-nitrogen expansion halogen-free flame retardant are used together in the related art, the application provides a building template material and a preparation method thereof.
In a first aspect, the present application provides a building template material that adopts the following technical scheme:
the building template material comprises the following raw materials in parts by weight:
polypropylene: 100 parts of
Phosphorus-nitrogen expansion halogen-free flame retardant: 15-20 parts
Modified calcium carbonate: 8-12 parts
Antioxidant: 0.8-1.2 parts
The modified calcium carbonate is calcium carbonate with silicon dioxide coated on the surface.
The phosphorus-nitrogen series expansion halogen-free flame retardant generally consists of an acid source, a carbon source and an air source. Wherein the carbon source is mainly some polyhydroxy compounds such as pentaerythritol, starch, polyhydroxy-containing organic resin and the like; the acid source is a substance capable of promoting dehydration and carbonization of the polyhydroxy compound in the combustion process, and mainly comprises inorganic acid salts and inorganic acid esters, such as ammonium phosphate salts, phosphate esters, borate salts and silicate salts; the air source is a compound which can release a large amount of nonflammable nontoxic gas when heated, and the gas released by heating can expand and foam the machine body. Such compounds include melamine, ammonium polyphosphate, ammonium borate and the like.
Aiming at the problem that the flame retardant efficiency of the phosphorus-nitrogen expansion halogen-free flame retardant is reduced when the calcium carbonate and the phosphorus-nitrogen expansion halogen-free flame retardant are used simultaneously in the related art, the inventor speculates that the reason is that the calcium carbonate can react with an acid source in the phosphorus-nitrogen expansion halogen-free flame retardant, so that the dehydration carbonization process of the polyhydroxy compound is blocked, thereby influencing the flame retardant efficiency of the phosphorus-nitrogen expansion halogen-free flame retardant.
In this regard, the inventors have adopted the modified calcium carbonate of the present application in place of ordinary calcium carbonate. Wherein, the modified calcium carbonate in the application is calcium carbonate with silicon dioxide coated on the surface. Under the coating action of silicon dioxide, calcium carbonate cannot react with an acid source in the phosphorus-nitrogen expansion halogen-free flame retardant, so that the acid source, the carbon source and the air source in the phosphorus-nitrogen expansion halogen-free flame retardant can cooperatively play 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 chloridizingDropwise adding an alkaline solution into a calcium solution, slowly adjusting the pH to 9-10, controlling the temperature of a system to be 80-85 ℃, and introducing the alkaline solution into the system with the volume ratio of 1: (3-4) CO 2 And N 2 After 1.5-2h of reaction; cooling to 50-55deg.C, stopping introducing mixed gas, and aging for 1-2 hr;
s2, slowly adding 2-3L of 0.4-0.5mol/L sodium silicate solution into the system after the aging of the S1 while introducing the mixed gas, stopping introducing the mixed gas after the sodium silicate solution is added, aging for 3-4 hours, cooling to room temperature, and then filtering, washing and drying to obtain the modified calcium carbonate.
Compared with the method for preparing the modified calcium carbonate by directly dripping the sodium silicate solution into the calcium carbonate dispersion slurry, the modified calcium carbonate prepared by the method not only can not obviously reduce the flame retardant efficiency of the phosphorus-nitrogen expansion halogen-free flame retardant, but also can further improve the tensile strength and the shock resistance of the building template material. In addition, the inventor discovers that in S1, after the reaction is completed, the aging after the temperature is reduced to 50-55 ℃ is a key factor for modifying calcium carbonate and improving the tensile strength and the impact resistance of the building template material.
Optionally, when the temperature in 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 S1 and S2 is 4-6m/S.
The purpose of introducing the mixed gas is to convert calcium hydroxide in a 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, the gas stirring can be used for replacing mechanical stirring, so that the problem that the mechanical stirring damages a calcium carbonate generating structure is prevented, and the modified calcium carbonate can improve the impact resistance of the building template material while improving the tensile strength of the building template material.
Optionally, the adding speed of the sodium silicate solution in the step 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 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 S2, after the silane coupling agent-ethanol solution is added and heated for reflux, 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 expansion 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 to the pentaerythritol to the melamine is (3.5-4.5): (1.8-2.2): 1, the phosphorus-nitrogen expansion halogen-free flame retardant can cooperatively play a better flame retardant effect, and the flame retardant effect of the building template material is better.
Optionally, the phosphorus-nitrogen expansion 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 to the pentaerythritol to the melamine is 4:2:1, the building template material has the best flame retardant effect.
Optionally, the antioxidant includes an antioxidant 1010 and an 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 can effectively prevent thermal oxidative degradation of the polymeric material. The antioxidant 168 can effectively decompose the hydroperoxide generated in the polymer material hot working process, so the stability of the polymer material in the working process can be improved by compounding the antioxidant 1010 and the antioxidant 168.
In a second aspect, the present application provides a method for preparing a building template material, which adopts the following scheme:
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 and antioxidant according to a proportion to obtain a premix;
and (3) melting the premix at 195-205 ℃ and 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 has the advantages of simple process steps and convenient operation.
In summary, the present application at least includes the following beneficial effects:
the modified calcium carbonate can not only improve the tensile property of the building template material, but also solve the problem that the flame retardant efficiency of the phosphorus-nitrogen expansion halogen-free flame retardant is easy to be reduced when the common calcium carbonate is directly added. Namely, the building template material has better tensile property and better flame retardant property.
Detailed Description
Aiming at the problem that the flame retardant efficiency of the calcium carbonate and the phosphorus-nitrogen expansion halogen-free flame retardant used simultaneously in the related art is reduced, the inventor adopts the modified calcium carbonate of the application to replace common calcium carbonate. Wherein the modified calcium carbonate is specifically calcium carbonate with silicon dioxide coated on the surface. Preferably, the modified calcium carbonate is prepared by the following preparation method:
s1, 8L of 0.1-0.3mol/L sodium carbonate solution is dropwise added into 5L of 0.1-0.3mol/L calcium chloride solution, the pH value is slowly regulated to 9-10 by dropwise adding alkali solution, the temperature of the system is controlled to be 80-85 ℃, and the volume ratio is 1: (3-4) CO 2 And N 2 After 1.5-2h of reaction; cooling to 50-55deg.C, stopping introducing mixed gas, and aging for 1-2 hr;
s2, slowly adding 2-3L of 0.4-0.5mol/L sodium silicate solution into the system after the aging of the S1 while introducing the mixed gas, stopping introducing the mixed gas after the sodium silicate solution is added, aging for 3-4 hours, cooling to room temperature, and then filtering, washing and drying to obtain the modified calcium carbonate.
Compared with the method for preparing the modified calcium carbonate by directly dripping the sodium silicate solution into the calcium carbonate dispersion slurry, the modified calcium carbonate prepared by the method not only can not obviously reduce the flame retardant efficiency of the phosphorus-nitrogen expansion halogen-free flame retardant, but also can further improve the impact resistance of the building template material.
Preferably, when the temperature in 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. The flowing speed of the mixed gas is too low, so that the stirring effect is difficult to play, and the generating structure of the calcium carbonate is easily damaged due to the too high flowing speed of the mixed gas. When the flow rate of the mixed gas is controlled to be 4-6m/s, the gas stirring can be used for replacing mechanical stirring, so that the problem that the mechanical stirring damages the calcium carbonate generating structure is prevented, and the modified calcium carbonate can improve the impact resistance of the building template material while improving the tensile strength of the building template material.
Preferably, the adding speed of the sodium silicate solution in the step 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 can be 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 modified calcium carbonate to replace common calcium carbonate, so that the tensile strength of the building template material is improved, the flame retardant efficiency of the phosphorus-nitrogen expansion halogen-free flame retardant is improved, and the pain point problem of the industry is solved.
Preferably, 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 phosphorus-nitrogen expansion halogen-free flame retardant is favorable for synergistically playing a better flame retardant effect, and the flame retardant effect of the building template material is better.
More preferably, 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 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, phosphorus-nitrogen expansion halogen-free flame retardant, modified calcium carbonate and antioxidant according to a proportion to obtain a premix;
and (3) melting the premix at 195-205 ℃ and extruding and granulating to obtain the building template material.
Specific preparations, examples and comparative examples are described below.
Preparation example
Preparation example 1
A modified calcium carbonate, the preparation method comprising the steps of:
50g of calcium carbonate powder was dispersed in 200mL of water, the pH was adjusted to 9-10, and then 1 by volume was introduced at the same time: (3-4) CO 2 And N 2 Slowly adding 2L of 0.4mol/L sodium silicate solution, stopping introducing the mixed gas after the sodium silicate solution is added, aging for 3-4 hours, cooling to room temperature, filtering, washing and drying to obtain the modified calcium carbonate.
Preparation example 2
The difference between the modified calcium carbonate and the preparation example 1 is that:
the calcium carbonate is replaced by equivalent calcium carbonate whisker.
Preparation example 3
A modified calcium carbonate, the preparation method comprising the steps of:
s1, dropwise adding 8L of 0.3mol/L sodium carbonate solution into 5L of 0.3mol/L calcium chloride solution, dropwise adding sodium hydroxide alkali liquor, and slowly adjusting the pH to 9-10Controlling the temperature of the system to be 85 ℃ and introducing the mixture into the reactor with the volume ratio of 1: CO of 4 2 And N 2 The flow rate of the mixed gas is 4m/s for reaction for 2h;
s2, slowly adding 2L of 0.4mol/L sodium silicate solution into the system after the reaction is completed in the step S1 while introducing mixed gas, wherein the introducing flow rate of the mixed gas is 4m/S, the adding speed of the sodium silicate solution is controlled at 60mL/min, stopping introducing the mixed gas after the sodium silicate solution is added, aging for 3 hours, cooling to room temperature, and then filtering, washing and drying to obtain the modified calcium carbonate.
Preparation example 4
The difference between the modified calcium carbonate and the preparation example 3 is that:
s1, after reacting for 2 hours, cooling to 50 ℃ at a cooling speed of 0.5 ℃/min, stopping introducing mixed gas, and aging for 1 hour;
and S2, adding the sodium silicate solution into the system after the aging of the S1.
Preparation example 5
The difference between the modified calcium carbonate and the preparation example 4 is that:
and (2) after the ageing in the step (S2), adding 200g of silane coupling agent-ethanol solution, heating and refluxing for 1.5 hours, cooling to room temperature, and then 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 a volume fraction of 5%.
Examples
Example 1
The 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 produced in preparation example 1: 8kg of
Antioxidant 0.8kg
The phosphorus-nitrogen expansion 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, a step of;
the antioxidants include an antioxidant 1010 and an antioxidant 168, the weight ratio of the antioxidant 1010 to the antioxidant 168 being 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 (3) putting the premix into an extruder, setting the temperature of the extruder to 195-205 ℃, extruding after melting, and granulating to obtain the building template material.
Example 2
A building template material, differing from example 1 in that: the proportion of each component is different.
The building template material in this embodiment comprises the following components in proportion:
polypropylene: 100kg of
15kg of phosphorus-nitrogen expansion halogen-free flame retardant
Modified calcium carbonate produced in preparation example 1: 8kg of
Antioxidant 0.8kg.
Example 3
A building template material differing from example 1 in that:
the modified calcium carbonate produced in preparation example 1 was replaced with the same amount of the modified calcium carbonate produced in preparation example 2.
Example 4
A building template material differing from example 1 in that:
the modified calcium carbonate produced in preparation example 1 was replaced with the same amount of the modified calcium carbonate produced in preparation example 3.
Example 5
A building template material differing from example 1 in that:
the modified calcium carbonate produced in preparation example 1 was replaced with the same amount of the modified calcium carbonate produced in preparation example 4.
Example 6
A building template material differing from example 1 in that:
the modified calcium carbonate produced in preparation example 1 was replaced with the same amount of the modified calcium carbonate produced in preparation example 5.
Comparative example
Comparative example 1
A building template material, namely a polypropylene raw material.
Comparative example 2
A building template material differing from example 1 in that:
the modified calcium carbonate produced in preparation example 1 was replaced with an equivalent amount of calcium carbonate.
Comparative example 3
The building template material differs from comparative example 1 in that:
no calcium carbonate was added.
Performance test data
(1) Limiting oxygen index test, namely adopting a JF-3 limiting oxygen index tester to test the limiting oxygen index of the PP spline according to a test method specified in GB/T2406-2008. Wherein, the larger the limiting oxygen index is, the better the flame retardant effect of the sample strip is.
Vertical burn test the sample bars were tested for vertical burn by a horizontal vertical burn tester according to the test method specified in GB/T2408-2021. If 0<t is less than or equal to 10s and does not ignite absorbent cotton, the vertical combustion grade is UL-94V-0, t is less than or equal to 30s, and does not ignite absorbent cotton, the vertical combustion grade is UL-94V-1, t is less than or equal to 30s, and the vertical combustion grade is UL-94V-2.
Tensile Property the bars were tested with a high and low temperature tensile tester according to the relevant standards in GB/T1040.1-2006.
Impact performance according to the relevant standard of the cantilever beam notch impact test in GB/T1843-2008, the sample strip is tested by an impact tester.
Table 1 Properties of the sample bars obtained from the building template materials of examples 1 to 6 and comparative examples 1 to 3
Figure BDA0003814926060000071
Figure BDA0003814926060000081
It is apparent 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 polypropylene, the limiting oxygen index of the building template material increases and the vertical burning grade changes from V-2 to V-1, whereby the phosphorus-nitrogen based intumescent halogen-free flame retardant can improve the flame retardant performance of polypropylene. However, when the calcium carbonate and the phosphorus-nitrogen expansion halogen-free flame retardant are simultaneously mixed into polypropylene, the flame retardant property of the building template material is not greatly different from that of the polypropylene raw material, which indicates that the direct addition of the calcium carbonate reduces the flame retardant efficiency of the phosphorus-nitrogen expansion halogen-free flame retardant.
It is known from the data in table 1 in combination with examples 1 to 6 and comparative example 2 that when the modified calcium carbonate coated with silica on the surface of the present application is used instead of ordinary calcium carbonate, the flame retardant property of the building template material can be effectively improved, and the problem that the flame retardant property of the building template material is easily reduced when the building template material is directly doped with calcium carbonate is improved is solved.
It is understood that the modified calcium carbonate prepared in preparation examples 1 to 3 does not decrease the flame retardant efficiency of the phosphorus-nitrogen based intumescent halogen-free flame retardant, but does not improve the impact resistance of the building template material by combining example 1 with examples 3 to 5 and combining the data in table 1. The modified calcium carbonate prepared in the preparation example 4 not only can improve the flame retardant efficiency of the phosphorus-nitrogen expansion halogen-free flame retardant, but also can improve the impact resistance of the building template material.
As can be seen from the data in table 1 in combination with examples 5 and 6, the addition of the silane coupling agent to modify calcium carbonate is advantageous for further improving the dispersibility of the modified calcium carbonate, thereby further improving the compressive strength and impact resistance of the building template material.

Claims (5)

1. A building template material, characterized in that: the material comprises the following raw materials in parts by weight:
polypropylene: 100 parts of
Phosphorus-nitrogen expansion halogen-free flame retardant: 15-20 parts
Modified calcium carbonate: 8-12 parts
Antioxidant: 0.8-1.2 parts
The phosphorus-nitrogen series 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, a step of;
the preparation method of the modified calcium carbonate comprises the following steps:
s1, 8L of 0.1-0.3mol/L sodium carbonate solution is dropwise added into 5L of 0.1-0.3mol/L calcium chloride solution, the pH value is slowly regulated to 9-10 by dropwise adding alkali solution, the temperature of the system is controlled to be 80-85 ℃, and the volume ratio is 1: (3-4) CO 2 And N 2 Reacting for 1.5-2h; cooling to 50-55deg.C, stopping introducing mixed gas, and aging for 1-2 hr;
s2, slowly adding 2-3L of 0.04-0.05mol/L sodium silicate solution into the system after the aging is completed in the step S1 while introducing the mixed gas, stopping introducing the mixed gas after the sodium silicate solution is added, aging for 3-4 hours, cooling to room temperature, and filtering, washing and drying to obtain modified calcium carbonate;
when the temperature is reduced to 50-55 ℃ in the step S1, the temperature reduction speed is controlled to be 0.1-0.2 ℃/min;
the flow rate of the mixed gas in S1 and S2 is 4-6m/S;
and S2, controlling the adding speed of the sodium silicate solution in the step S2 to be 40-50mL/min.
2. A building template material according to claim 1, wherein: and S2, after the ageing is finished, adding a silane coupling agent-ethanol solution, heating and refluxing for 1-2 hours, cooling to room temperature, and then filtering, washing and drying to obtain the modified calcium carbonate.
3. A building template material according to claim 1, wherein: the phosphorus-nitrogen expansion 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.
4. a building template material according to 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.
5. A method for producing a building template material according to any one of claims 1 to 4, comprising the steps of:
uniformly mixing polypropylene, phosphorus-nitrogen expansion halogen-free flame retardant, modified calcium carbonate and antioxidant according to a proportion to obtain a premix;
and (3) melting the premix at 195-205 ℃ and extruding and granulating to obtain the building template material.
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