CN114276602B - Halogen-free high-flame-retardance polyolefin material and preparation method thereof - Google Patents
Halogen-free high-flame-retardance polyolefin material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a halogen-free high-flame-retardance polyolefin material and a preparation method thereof, wherein the halogen-free high-flame-retardance polyolefin material comprises the following components in parts by weight: 20-40 parts of POE, 20-40 parts of PE, 6-24 parts of PP, 4-16 parts of PPO, 5-15 parts of PE compatilizer, 140-180 parts of flame retardant, 1-5 parts of flame retardant synergist, 0.5-3 parts of lubricant and 0.3-2 parts of antioxidant; when in preparation, all PP, PPO, 0.1 part of antioxidant and 0.2 part of lubricant are uniformly mixed, and the mixture is granulated by a double screw to obtain carbon source master batch; then proportioning POE, PE, prefabricated carbon source master batches, compatilizer, flame retardant synergist, residual carbon adhesive, lubricant and antioxidant according to a certain proportion, adding into an internal mixer, mixing until the temperature of the mixture is 160-170 ℃, discharging, feeding into a conical feeding hopper, granulating by a double screw and a single screw, and cooling to obtain a product; the material has good carbon forming effect, and the carbon layer is firm and compact, so that the material has excellent flame retardant property, and can meet the flame retardant requirements of large-scale cables such as cable B1 flame retardance, bunched A flame retardance and the like.
Description
Technical Field
The invention relates to a halogen-free high flame-retardant polyolefin material, which is a high polymer material for wires and cables, and is suitable for large-size wires and cables with high flame-retardant performance requirements. The invention also relates to a preparation method of the halogen-free high-flame-retardance polyolefin material.
Background
With the rapid development of economy and society, the national and masses have higher and higher requirements on fire safety, and have higher and higher requirements on flame retardance of living and industrial articles. The POE and PE polyolefin materials have good mechanical and physical properties and electrical properties, are low in cost, are particularly suitable for insulation and sheath materials of wires and cables, but have low flame retardant property, low carbon formation and heat release, the current halogen-free flame retardant system is low in improvement efficiency of the flame retardant property, and even if the high-proportion halogen-free flame retardant is filled, the high flame retardant property is difficult to be large, the strength, the elongation and the technological property of the materials are greatly reduced, and the application of the materials is limited.
Polyphenylene Oxide (PPO) is an engineering plastic with many advantages such as high heat resistance, low temperature resistance, impact resistance, low density, small hygroscopicity, good flame retardance, no molten drop, self-extinguishment, etc., but has high melting point and glass transition temperature, poor melt fluidity and difficult molding. Because of high processing temperature and poor processing performance, the halogen-free flame retardant resin is difficult to be matched with halogen-free flame retardant with lower decomposition temperature, such as magnesium hydroxide, particularly aluminum hydroxide, and also cannot be matched with base resin with lower decomposition temperature, such as EVA. The processability of PPO can be improved by modifying the PPO, and the PPO is applied to some fields, but PPO is rarely used as a carbon source for preparing polyolefin materials at present.
Flame retardance of polymeric materials is achieved more by the addition of flame retardants in addition to the intrinsic flame retardance of the matrix material. The flame retardant commonly used at present comprises halogen flame retardants, inorganic flame retardants, phosphorus-nitrogen flame retardants, intumescent flame retardants and the like. The halogen flame retardant has the advantages of high flame retardant efficiency, small addition amount, small influence on material performance and the like, but does not accord with the development trend of green flame retardance, and the cost is several times or even more than ten times higher than that of the inorganic flame retardant. Although the inorganic flame retardant accords with the development trend of green flame retardance and has lower cost, the flame retardant has low flame retardance efficiency, large addition amount and large influence on the material performance. PE, POE, EVA, and the like, the flame retardant performance of the polymer materials can be obviously improved by adding a large amount of inorganic flame retardants, but the polymer materials generally cannot meet the special high flame retardant requirement. Although phosphorus-nitrogen flame retardants, intumescent flame retardants and the like have higher flame retardant efficiency than inorganic flame retardants, they have disadvantages in some aspects or aspects such as cost, moisture absorption, precipitation, and smoke generation, and are rarely used in practical applications in polymers such as PE, POE, EVA. The effect of compounding and adding a certain flame retardant and a small amount of synergistic flame retardant (such as nano montmorillonite) into a polymer such as PE, POE, EVA is better than that of singly adding a certain flame retardant, but the high flame retardant requirement of some cables, such as B1 type flame retardant, bundled A type flame retardant and the like, is still difficult to meet.
Therefore, the green and efficient flame retardance of the polyolefin such as PE, POE, EVA is still an industrial problem, and the realization of the efficient flame retardance of the polyolefin material is a hot spot for continuous research in the industry.
Disclosure of Invention
The invention aims to solve the technical problem of providing a halogen-free high-flame-retardance polyolefin material, which has a good carbon forming effect, and a carbon layer is firm and compact, so that the material has excellent flame retardance and can meet the flame retardance requirements of a cable B1 type and a bunched A type.
In order to solve the technical problems, the halogen-free high flame retardant polyolefin material comprises the following components in parts by weight: POE (Power over Ethernet)
20 to 40 parts of PE 20 to 40 parts of PP 6 to 24 parts of PPO 4 to 16 parts of compatilizer 5 to 15 parts of flame retardant 140 to 180 parts of flame retardant synergist 1 to 5 parts of lubricant 0.5 to 3 parts of antioxidant 0.3 to 2 parts of flame retardant synergist.
Wherein POE, PE, PP, PPO, PE compatilizer is used as a base material to provide basic mechanical and physical properties, technological properties and the like for the finished product, such as hardness, strength, elongation, extrusion speed, appearance and the like. The POE is ethylene-butene or ethylene-octene copolymer, and the melt flow rate range of the POE is 0.5-8.0 g/10min under the action of 2.16KG weight at 190 ℃; the PE is at least one of LDPE, LLDPE, HDPE, and the melt index is preferably 2-10 g/10min under the action of a 2.16KG weight at 190 ℃; the PP is at least one of random PP, copolymerized PP and homopolymerized PP, and the melt index of the PP is 2-10 g/10min under the action of a 2.16KG weight at 190 ℃. Wherein, the random PP has low processing temperature, and is easier to process when the PPO master batch is compounded with the polyolefin base material. For the specification of the melt index of the base material, the aim is to ensure the comprehensive performance of the finished product, such as the too small melt index, the possible performance of strength, elongation and the like can be improved, but the process performance of the finished product is poor, so that a plurality of process problems of increased extrusion current, increased energy consumption, slower extrusion speed, rough appearance and the like are caused; if the melt index is too large, the strength, elongation, low temperature resistance and cracking resistance of the material are remarkably reduced. The proportions of the components of the substrate are also selected based on product overall performance considerations.
Too little POE may result in insufficient elongation, too much POE may affect heat distortion properties and increase costs. Too much PE results in insufficient elongation of the material, too much hardness results in poor heat distortion performance. The PE compatilizer increases the compatibility of the base material and the inorganic filling, improves the strength, the elongation and the like of the finished product, and the PE compatilizer is too much, so that the process performance is poor, the cost is increased, and too little is insufficient to ensure the compatibility of the base material and the inorganic filling, so that the elongation is poor. The PP is used for preparing the PPO master batch, so that the processing temperature and the processing performance of the PPO master batch are reduced, the PPO is introduced into a conventional polyolefin system, and the carbon forming capacity of the conventional polyolefin system is enhanced. PP and PPO are components with larger hardness, and when the addition amount is too large, the elongation is insufficient, and when the addition amount is too small, enough PPO cannot be introduced, so that the carbon forming capability of the base material is reduced. The ratio of PP to PPO is mainly based on the fact that PPO forms a microscopic dispersed phase in the blend system of the two, but cannot form a continuous phase, because forming a continuous phase makes it difficult to reduce the processing temperature of the PPO masterbatch, and thus makes it difficult to use the PPO in conventional polyolefins. In a binary blending system of PP and PPO, too little PP forms a continuous phase or a bicontinuous phase, too much PPO reduces the concentration of PPO, influences the amount of PPO introduced into a polyolefin substrate system, reduces the carbon forming capacity of the substrate, and influences the flame retardant property of a finished product.
The PPO is a medium-high molecular weight powdery raw material.
The flame retardant is a mixture of magnesium hydroxide and zinc borate, and the mass ratio of the magnesium hydroxide to the zinc borate is 20:1 because the magnesium hydroxide and the zinc borate are inorganic environment-friendly flame retardants with higher decomposition temperature and completely adapt to the process temperature range of PP with higher melting point in the base material.
The synergistic flame retardant is at least one of layered montmorillonite, kaolin, mcmahogany, attapulgite, perovskite and double hydroxide.
In order to solve the problems of the integrity and compactness of the carbon layer, the components contain 5-20 parts of carbon residue adhesive, wherein the carbon residue adhesive is a nitrogenous substance and can volatilize or decompose to generate inert gas, preferably at least one of melamine, ammonium polyphosphate, melamine polyphosphate and melamine cyanurate, between the processing temperature of the material and the decomposition temperature of the substrate. The carbon residue binder should not be added too much or too little. Too little will not form the complete, dense carbon layer of finished product, too much will influence the finished product low temperature, lengthen, tensile strength, etc., even have risks such as moisture absorption, precipitation, etc., so the principle of adding of the carbon residue adhesive is: under the condition of ensuring the formation of a complete and compact carbon layer, the carbon residue adhesive is added as little as possible, so that the influence of the carbon residue adhesive on the performance of a finished product is reduced, and meanwhile, the cost is reduced.
The preparation method of the halogen-free high-flame-retardance polyolefin material comprises the following steps: uniformly mixing PP, PPO, 0.1 part of antioxidant and 0.2 part of lubricant, and granulating by a double screw to obtain a carbon source master batch; and then proportioning POE, PE, a prefabricated carbon source master batch, a compatilizer, a flame retardant synergist, a carbon residue adhesive, a lubricant (rest) and an antioxidant (rest) according to a certain proportion, adding the materials into an internal mixer, mixing until the temperature of the materials is 160-170 ℃, discharging the materials, feeding the materials into a conical feeding hopper, granulating by a double screw rod and a single screw rod, and cooling to obtain the product.
Specifically, the temperature of each section of the twin screw is as follows: 160-180 ℃ in the first area, 210-220 ℃ in the second area, 220-230 ℃ in the third area, 230-240 ℃ in the fourth area, 240-250 ℃ in the fifth area, 250-260 ℃ in the sixth area, 250-260 ℃ in the seventh area, 240-250 ℃ in the eighth area, 240-250 ℃ in the ninth area and 230-240 ℃ in the head temperature. The temperature of the conical feeding hopper is 150-170 ℃ during the preparation of the finished product, and the temperatures of each section of the double-screw extruder are as follows: 120-130 ℃ in the first area, 130-140 ℃ in the second area, 140-150 ℃ in the third area, 150-160 ℃ in the fourth area, 160-170 ℃ in the fifth area, 160-170 ℃ in the sixth area, 170-180 ℃ in the seventh area, 160-170 ℃ in the eighth area, 160-170 ℃ in the ninth area, and 160-170 ℃ in the head temperature; the temperature of the single screw extruder is as follows: the temperature of the first area is 140-150 ℃, the second area is 150-160 ℃, the third area is 160-170 ℃ and the temperature of the machine head is 160-170 ℃.
Through the technical scheme, the application of PPO in polyolefin base materials is realized, the batch production can be carried out by adopting the prior banburying and double-stage process, the carbon source of the polyolefin material is increased, and a material basis is provided for improving the flame retardant property of the polyolefin material. On the basis of increasing carbon sources, the nano intercalation carbon forming technology is further combined, and the carbon forming effect of polyolefin base material systems such as POE, PE and the like is improved. On the basis of solving the carbon forming problem, the compactness, the firmness and the anti-dripping property of the carbon layer are realized by introducing the carbon residue adhesive, the heat, oxygen and combustible exchange inside and outside the carbon layer is reduced, the flame retardant effect is improved, and the high flame retardant property of the material is realized.
There are two technical problems to be solved by the present invention. The first technical problem is how to solve the compounding use of PPO, polyolefin resin and conventional inorganic flame retardant (at least magnesium hydroxide). The second technical problem is how to solve the problems of carbon formation of the polyolefin substrate and the integrity and compactness of carbon residue. Aiming at the first problem, the invention adopts the technical proposal of PPO prefabricated master batch to solve the problem that PPO and PP are mixed and granulated, so that the PPO forms microscopic disperse phase in the PP. When the PPO prefabricated master batch is blended and granulated with other components of the invention, the problem of poor PPO technical performance is solved because the PP has lower melting point and better technical performance. Meanwhile, because the PPO forms microscopic disperse phase in the PP, when the PPO prefabricated master batch and other components of the invention are blended and granulated to prepare a finished product, the problem of the dispersion of the PPO in the finished product is solved. Therefore, PPO is smoothly introduced into a conventional polyolefin system through a process of prefabricating the master batch, and the carbon forming property and the flame retardance of the base material are improved. Aiming at the carbonization problem in the second problem, on the basis of improving the carbonization performance of the base material by introducing PPO, a synergistic flame retardant with a nano carbonization function is added, so that the carbonization effect of the base material is further enhanced. The combination of PPO and nano carbon forming synergist for flame retardance increases the carbon forming capacity and carbon forming amount of the finished product, but only enough residual carbon is insufficient for realizing good flame retardance, because cracked carbon has no obvious effect of blocking heat transfer and mass transfer (combustible other mass transfer), and even has serious dripping phenomenon. Therefore, on the basis of solving the carbon residue, the problems of integrity and compactness of the carbon layer are also required to be solved. In order to solve the problems of integrity and compactness of the carbon layer, carbon residue binder (in the present invention, nitrogen-containing substances such as melamine, ammonium polyphosphate, melamine cyanurate and the like which can volatilize or decompose to generate inert gas between the material processing temperature and the substrate decomposition temperature) is introduced into the components of the present invention. Under the action of the carbon residue binder, the carbon produced by the finished product is not cracked any more, but is a complete and compact carbon layer, and the test sample is completely free from dripping. Through the combination of the two technical schemes, the carbon forming effect, the integrity and the compactness of a carbon layer of the conventional polyolefin material are improved, dripping is completely eradicated, the material has excellent flame retardant property, and the flame retardant requirements of cable B1 flame retardance, bundled A flame retardance and the like can be met.
The mechanism of action of the carbon residue binder used in the present invention is not completely understood. In the intumescent flame retardant, a nitrogen-containing substance is often used as a gas source, so that the material expands several times or tens times when being burnt or at high temperature, and the flame retardant is realized by matching with an acid source and a carbon source. However, in the practical experiment of the invention, the residue after the sample is burnt basically has no expansion, but is similar to the original size before the sample is burnt, and the width, the thickness and the length are not obviously changed, which is obviously different from the action mechanism of the nitrogen-containing substances in an expansion type flame-retardant system for achieving the flame-retardant effect through obvious expansion. Generally, when the flame retardant product of the inorganic flame retardant (magnesium hydroxide and aluminum hydroxide) burns, the flame retardant can be decomposed to generate water vapor so as to expand in the obvious thickness direction, but after the carbon residue binder is introduced into the system of the invention, the expansion phenomenon caused by the addition of the carbon residue binder is avoided, and the common expansion caused by the inorganic flame retardant is eliminated. Therefore, the flame retardant mechanism of the flame retardant system of the invention needs to be further researched, and the flame retardant mechanism is clear, which has great significance for developing a high-efficiency flame retardant system and enriching the flame retardant mechanism.
Detailed Description
Example 1
The weight parts of each component are shown in table 1. Uniformly mixing PP and PPO (PP: PPO is 60:40), 0.1 part of antioxidant and 0.2 part of lubricant, granulating by a double screw to obtain a carbon source master batch, wherein the temperatures of all sections of the double screw are as follows: first zone 170 ℃, second zone 215 ℃, third zone 225 ℃, fourth zone 235 ℃, fifth zone 245 ℃, sixth zone 255 ℃, seventh zone 255 ℃, eighth zone 245 ℃, ninth zone 245 ℃ and head temperature 235 ℃. And then weighing the rest materials and the carbon source master batch according to the proportion, adding the materials into an internal mixer, mixing until the temperature of the materials is 160-170 ℃, discharging, feeding the materials into a conical feeding hopper, granulating by a double screw and a single screw, and cooling to obtain the product. Wherein the temperature of the conical feeding hopper is 160 ℃; the temperatures of all sections of the double-screw extruder are as follows: first region 125 ℃, second region 135 ℃, third region 145 ℃, fourth region 155 ℃, fifth region 165 ℃, sixth region 165 ℃, seventh region 175 ℃, eighth region 165 ℃, ninth region 165 ℃ and head temperature 165 ℃; the temperature of the single screw extruder was. First zone 145 ℃, second zone 155 ℃, third zone 165 ℃, and head temperature 165 ℃.
Wherein POE is an ethylene-butene copolymer, and the melt flow rate range of the POE is 5g/10min under the action of a 2.16KG weight at 190 ℃; PE is LDPE, and the melt index is preferably 8g/10min under the action of a weight of 2.16KG at 190 ℃; PP is random PP, and the melt index of the PP is 8g/10min under the action of a 2.16KG weight at 190 ℃; the flame retardant is a mixture of magnesium hydroxide and zinc borate, and the mass ratio of the magnesium hydroxide to the zinc borate is 20:1.
Example 2
The components and parts by weight of the components are shown in Table 1, and the preparation procedure is the same as in example 1. Wherein POE is an ethylene-octene copolymer, and the melt flow rate range of the POE is 2g/10min under the action of a 2.16KG weight at 190 ℃; PE is LLDPE, and the melt index is preferably 5g/10min under the action of a 2.16KG weight at 190 ℃; PP is homopolymerized PP, and the melt index of the PP is 6g/10min under the action of a 2.16KG weight at 190 ℃; the flame retardant is a mixture of magnesium hydroxide and zinc borate, and the mass ratio of the magnesium hydroxide to the zinc borate is 20:1.
Example 3
The components and parts by weight of the components are shown in Table 1, and the preparation procedure is the same as in example 1. Wherein POE is an ethylene-octene copolymer, and the melt flow rate range of the POE is 6g/10min under the action of a 2.16KG weight at 190 ℃; PE is HDPE, and the melt index is preferably 10g/10min under the action of a 2.16KG weight at 190 ℃; PP is copolymerized PP, and the melt index of the copolymerized PP is 8g/10min under the action of a 2.16KG weight at 190 ℃; the flame retardant is a mixture of magnesium hydroxide and zinc borate, and the mass ratio of the magnesium hydroxide to the zinc borate is 20:1.
TABLE 1 examples 1-3 Components and parts by weight of the Components
| Component (A) | Example 1 | Example 2 | Example 3 |
| POE | 20 | 35 | 40 |
| PE | 30 | 40 | 35 |
| PP | 24 | 12 | 6 |
| PPO | 16 | 8 | 4 |
| PE compatilizer | 10 | 5 | 15 |
| Flame retardant | 140 | 160 | 180 |
| Carbon residue adhesive (Melamine cyanurate) | 18 | ||
| Carbon residue adhesive (Melamine) | 12 | ||
| Carbon residue adhesive (melamine polyphosphate) | 6 | ||
| Flame retardant synergist (nanometer montmorillonite) | 5 | ||
| Flame retardant synergist (Kaolin) | 3.5 | ||
| Flame retardant synergist (attapulgite) | 1.5 | ||
| Lubricant | 2.5 | 2.5 | 2.5 |
| Antioxidant | 1.5 | 1.5 | 1.5 |
Comparative example 1
The components and parts by weight of the components are shown in Table 2, and the preparation procedure is the same as in example 1, except that the corresponding components are not added. Wherein POE is an ethylene-octene copolymer, and the melt flow rate range of the POE is 5g/10min under the action of a 2.16KG weight at 190 ℃; PE is HDPE, and the melt index is preferably 4g/10min under the action of a 2.16KG weight at 190 ℃; PP is copolymerized PP, and the melt index of the copolymerized PP is 6g/10min under the action of a 2.16KG weight at 190 ℃; the flame retardant is a mixture of magnesium hydroxide and zinc borate, and the mass ratio of the magnesium hydroxide to the zinc borate is 20:1.
Comparative example 2
The components and parts by weight of the components are shown in Table 2, and the preparation procedure is the same as in example 1, except that the corresponding components are not added. Wherein POE is an ethylene-butene copolymer, and the melt flow rate range of the POE is 7g/10min under the action of a 2.16KG weight at 190 ℃; PE is LLDPE, and the melt index is preferably 3g/10min under the action of a 2.16KG weight at 190 ℃; PP is random PP, and the melt index of the PP is 6g/10min under the action of a 2.16KG weight at 190 ℃; the flame retardant is a mixture of magnesium hydroxide and zinc borate, and the mass ratio of the magnesium hydroxide to the zinc borate is 20:1.
Comparative example 3
The components and parts by weight of the components are shown in Table 2, and the preparation procedure is the same as in example 1, except that the corresponding components are not added. Wherein POE is an ethylene-butene copolymer, and the melt flow rate range of the POE is 3g/10min under the action of a 2.16KG weight at 190 ℃; PE is LDPE, and the melt index is preferably 6g/10min under the action of a weight of 2.16KG at 190 ℃; PP is homopolymerized PP, and the melt index of the PP is 8g/10min under the action of a 2.16KG weight at 190 ℃; the flame retardant is a mixture of magnesium hydroxide and zinc borate, and the mass ratio of the magnesium hydroxide to the zinc borate is 20:1.
Comparative example 4
The components and parts by weight of the components are shown in Table 2, and the preparation procedure is the same as in example 1, except that the corresponding components are not added. Wherein POE is an ethylene-octene copolymer, and the melt flow rate range of the POE is 4g/10min under the action of a 2.16KG weight at 190 ℃; PE is HDPE, and the melt index is preferably 6g/10min under the action of a 2.16KG weight at 190 ℃; PP is random PP, and the melt index of the PP is 8g/10min under the action of a 2.16KG weight at 190 ℃; the flame retardant is a mixture of magnesium hydroxide and zinc borate, and the mass ratio of the magnesium hydroxide to the zinc borate is 20:1.
Table 2 comparative examples 1 to 4 Components and parts by weight of the respective Components
The properties of the products obtained in examples 1 to 3 and comparative examples 1 to 4 are shown in Table 3. In comparative example 4, the PPO master batch cannot be plasticized and cannot be prepared into a finished product due to excessive PPO content in the PPO master batch.
Table 3 performance of examples and comparative examples
The above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.
Claims (7)
1. The halogen-free high-flame-retardance polyolefin material is characterized by comprising the following components in parts by weight: 20-40 parts of POE, 20-40 parts of PE, 6-24 parts of PP, 4-16 parts of PPO, 5-20 parts of carbon residue adhesive, 5-15 parts of compatilizer, 140-180 parts of flame retardant, 1-5 parts of flame retardant synergist, 0.5-3 parts of lubricant and 0.3-2 parts of antioxidant, wherein the carbon residue adhesive is a nitrogen-containing substance and can volatilize or decompose to generate inert gas between the processing temperature of the material and the decomposition temperature of a base material, and the flame retardant is a mixture of magnesium hydroxide and zinc borate; uniformly mixing PP, PPO, 0.1 part of antioxidant and 0.2 part of lubricant, wherein the mass ratio of the PP to the PPO is 3:2, and granulating by a double screw to obtain a carbon source master batch; then mixing POE, PE, prefabricated carbon source master batch, compatilizer, flame retardant synergist, carbon residue adhesive, lubricant and antioxidant, and granulating; the carbon residue binder is at least one of melamine, ammonium polyphosphate, melamine polyphosphate and melamine cyanurate.
2. The halogen-free, high flame retardant polyolefin material of claim 1, wherein: the POE is ethylene-butene or ethylene-octene copolymer, and the melt flow rate range of the POE is 0.5-8.0 g/10min under the action of 2.16KG weight at 190 ℃.
3. The halogen-free, high flame retardant polyolefin material of claim 1, wherein: the PP is at least one of random PP, copolymerized PP and homopolymerized PP, and the melt index of the PP is 2-10 g/10min under the action of a 2.16KG weight at 190 ℃.
4. The halogen-free, high flame retardant polyolefin material of claim 1, wherein: the PPO is a medium-high molecular weight powdery raw material.
5. The halogen-free, high flame retardant polyolefin material of claim 1, wherein: the flame retardant synergist is at least one of layered montmorillonite, kaolin, mcmahogany, attapulgite, perovskite and double hydroxide.
6. The method for preparing a halogen-free high flame retardant polyolefin material according to any one of claims 1 to 5, characterized by comprising the steps of: uniformly mixing PP, PPO, 0.1 part of antioxidant and 0.2 part of lubricant, and granulating by a double screw to obtain a carbon source master batch; and then proportioning POE, PE, a prefabricated carbon source master batch, a compatilizer, a flame retardant synergist, a carbon residue adhesive, a lubricant and an antioxidant according to a certain proportion, adding the mixture into an internal mixer, mixing until the temperature of the mixture is 160-170 ℃, discharging the mixture, feeding the mixture into a conical feeding hopper, granulating by a double screw and a single screw, and cooling to obtain the product.
7. The method for preparing the halogen-free high flame retardant polyolefin material according to claim 6, wherein the method comprises the following steps: the temperature of each section of the twin screw is as follows: 160-180 ℃ in the first area, 210-220 ℃ in the second area, 220-230 ℃ in the third area, 230-240 ℃ in the fourth area, 240-250 ℃ in the fifth area, 250-260 ℃ in the sixth area, 250-260 ℃ in the seventh area, 240-250 ℃ in the eighth area, 240-250 ℃ in the ninth area, and 230-240 ℃ in the machine head temperature; the temperature of the conical feeding hopper is 150-170 ℃ during the preparation of the finished product, and the temperatures of each section of the double-screw extruder are as follows: 120-130 ℃ in the first area, 130-140 ℃ in the second area, 140-150 ℃ in the third area, 150-160 ℃ in the fourth area, 160-170 ℃ in the fifth area, 160-170 ℃ in the sixth area, 170-180 ℃ in the seventh area, 160-170 ℃ in the eighth area, 160-170 ℃ in the ninth area, and 160-170 ℃ in the head temperature; the temperature of the single screw extruder is as follows: the temperature of the first area is 140-150 ℃, the second area is 150-160 ℃, the third area is 160-170 ℃ and the temperature of the machine head is 160-170 ℃.
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| CN105273352A (en) * | 2015-11-09 | 2016-01-27 | 安徽韧达高分子材料有限公司 | Halogen-free flame-retardant TPE material and preparation method thereof |
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| JPH11199724A (en) * | 1998-01-07 | 1999-07-27 | Asahi Chem Ind Co Ltd | Flame retardant resin composition |
| CN102775756A (en) * | 2012-07-27 | 2012-11-14 | 金发科技股份有限公司 | Scrape resistant halogen-free flame retardant composition of wire and cable and preparation method thereof |
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| CN104194306A (en) * | 2014-09-17 | 2014-12-10 | 朱忠良 | Halogen-free flame retardant wire composition and preparation method thereof |
| CN104530626A (en) * | 2015-01-20 | 2015-04-22 | 中利科技集团股份有限公司 | Halogen-free flame retardant thermoplastic elastomer cable material and preparation method thereof |
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