Preparation method of ultra-soft B1-level low-smoke halogen-free flame-retardant sheath material
By using combined materials and processes such as polyolefin resins in low-smoke, halogen-free flame retardant sheath materials, the problem that existing materials are difficult to take into account both flexibility and flame retardant properties is solved, and the preparation of ultra-soft B1 grade low-smoke, halogen-free flame retardant sheath materials is achieved, improving the application flexibility and safety of the materials.
Patent Information
- Application Number
- CN202411656062.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-04-22
AI Technical Summary
The existing low-smoke, halogen-free flame retardant sheath materials meet the B1 level flame retardant standards, while it is difficult to take into account both flexibility and mechanical properties, resulting in limited applications in complex environments and in small spaces.
The ultra-soft B1 grade low smoke halogen-free flame retardant sheath material is prepared by combining polyolefin resin, inorganic flame retardant, softener, compatibilizer, antioxidant and colorant by high-speed mixing, melt blending and extrusion granulation.
It achieves the ultra-soft characteristics of the material and the B1-level low-smoke, halogen-free flame retardant properties, improving the application flexibility and safety of the material in complex environments.
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of sheath materials and preparation thereof, and in particular to a method for preparing an ultra-soft B1-level low-smoke halogen-free flame-retardant sheath material. Background Art
[0002] In recent years, low-smoke halogen-free flame-retardant materials have gradually become the mainstream choice of the market due to their environmental protection and safety characteristics. However, the existing low-smoke halogen-free flame-retardant sheath materials generally have the problems of high hardness and insufficient flexibility, which to a certain extent limits their application in complex environments and small spaces. Especially in occasions that require frequent bending and movement, hard sheath materials are prone to damage to wires and cables, affecting their service life and safety.
[0003] In addition, the existing low-smoke halogen-free flame-retardant sheath materials often have difficulty taking into account both the mechanical properties and processing properties of the materials while meeting the B1 flame-retardant standard. For example, while improving the flame-retardant properties of some materials, the mechanical properties such as tensile strength and elongation at break of the materials will decrease, or problems such as poor fluidity and slow extrusion speed will occur during processing, increasing production costs and process complexity.
[0004] Therefore, developing a sheath material that is both ultra-soft and meets the B1-level low-smoke halogen-free flame retardant requirements has become a technical problem that needs to be urgently solved in the current wire and cable industry. Summary of the invention
[0005] The main purpose of the present invention is to provide a method for preparing an ultra-soft B1-level low-smoke halogen-free flame-retardant sheath material, aiming to solve the technical problem that existing cables cannot simultaneously meet the requirements of softness and flame retardancy.
[0006] To achieve the above object, the present invention provides an ultra-soft B1-level low-smoke halogen-free flame-retardant sheath material, which comprises, by weight: 50-70 parts of polyolefin resin; 100-150 parts of inorganic flame retardant; 10-20 parts of softener; Compatibilizer 5-10 parts; 1 to 3 parts of antioxidant; 1 to 5 parts of colorant.
[0007] Further, the polyolefin resin is polyethylene or polypropylene; The melt flow rate of the polyolefin resin is 0.3 to 20 g / 10 min; The density of the polyethylene is 0.91 to 0.96 g / cm³, and the density of the polypropylene is 0.89 to 0.91 g / cm³; The elongation at break of the polyethylene is 100% to 800%, and the elongation at break of the polypropylene is 100% to 500%.
[0008] Further, the inorganic flame retardant is magnesium hydroxide or aluminum hydroxide; The inorganic flame retardant has a particle size of 1 to 10 μm to ensure good dispersibility; Purity is greater than 95% to reduce the impact of impurities on cable performance; The decomposition temperature of magnesium hydroxide is 320-340°C, and the decomposition temperature of aluminum hydroxide is 200-220°C.
[0009] Furthermore, the compatibilizer is maleic anhydride grafted polyolefin; The grafting rate of the compatibilizer is between 0.5% and 2%; The melt flow rate of polyolefin resin is consistent; The softener is polyethylene wax or oxidized polyethylene wax.
[0010] Further, the antioxidant is 1010 or 168; The purity of the antioxidant should be greater than 99%.
[0011] The present invention also provides a method for preparing an ultra-soft B1-level low-smoke halogen-free flame-retardant sheath material, comprising the following steps: S1, high speed mixing Put the weighed components into a high-speed mixer and mix them thoroughly; The mixing time is 5 to 10 minutes to ensure that there is no agglomeration; The mixer speed is 1000-1500 rpm; S2. Melt blending Add the mixed materials into a twin-screw extruder at a temperature of 160°C to 200°C; The screw speed is 100-200 rpm; S3, extrusion granulation After melt blending, the materials are extruded through the die head of the extruder and enter the cooling water tank for cooling; The cooled material is cut into uniform particles by a pelletizer; The water temperature of the cooling water tank is 20℃~30℃; The material is completely cooled to room temperature; The particle size is 2 to 4 mm.
[0012] Furthermore, the extrusion temperature in each section is: Plasticizing section: 170℃~180℃; Homogenization section: 180℃~190℃; Discharging section: 190℃~200℃.
[0013] Furthermore, after the material is extruded through the die head of the extruder, it immediately enters a cooling water tank for cooling.
[0014] Furthermore, the particles are collected and dried to remove surface moisture, thereby obtaining an ultra-soft B1-level low-smoke halogen-free flame-retardant sheath material.
[0015] The beneficial effects of the present invention are embodied in: The present invention provides an ultra-soft B1-level low-smoke halogen-free flame-retardant sheath material and a preparation method thereof, which solves the problem in the prior art that it is difficult to simultaneously meet the softness, flame retardancy and low-smoke halogen-free properties, and has broad application prospects. DETAILED DESCRIPTION
[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0017] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.
[0018] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes that A and B meet at the same time. In addition, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist.
[0019] Embodiment 1
[0020] Calculated by mass, weigh 50 parts of polyethylene with a density of 0.91 g / cm³, a melt flow rate of 0.3 g / 10min, and an elongation at break of 100%; Weigh 100 parts of magnesium hydroxide with a particle size of 1 μm, a purity greater than 95%, and a decomposition temperature of 320°C; Weigh 10 parts of polyethylene wax; Weigh 5 parts of maleic anhydride grafted polyolefin having a compatibilizer grafting rate of 0.5% and a melt flow rate of 0.3 g / 10 min; Weigh 1 part of antioxidant (1010) with a purity greater than 99%; Weigh 1 part of colorant; Put the weighed components into a high-speed mixer and mix them thoroughly; The mixing time is 5 minutes to ensure no agglomeration; The mixer speed is 1000 rpm; Add the mixed materials into a twin-screw extruder at 160°C; The screw speed is 100 rpm; After melt blending, the materials are extruded through the die head of the extruder and enter the cooling water tank for cooling; The cooled material is cut into uniform particles by a pelletizer; The water temperature of the cooling water tank is 20℃; The material is completely cooled to room temperature; The particle size is 2 mm.
[0021] The extrusion temperatures in each section are: Plasticizing section: 170℃; Homogenization section: 180℃; Discharging section: 190℃.
[0022] After the material is extruded through the die head of the extruder, it immediately enters a cooling water tank for cooling.
[0023] The particles are collected, dried, and surface moisture is removed to obtain an ultra-soft B1-level low-smoke halogen-free flame-retardant sheath material.
[0024] Embodiment 2
[0025] Calculated by mass, weigh 60 parts of polypropylene with a density of 0.89 g / cm³, a melt flow rate of 10 g / 10 min, and an elongation at break of 500%; Weigh 120 parts of aluminum hydroxide with a particle size of 5 μm, a purity greater than 95%, and a decomposition temperature of 200°C; Weigh 15 parts of oxidized polyethylene wax; Weigh 8 parts of maleic anhydride grafted polyolefin with a compatibilizer grafting rate of 1% and a melt flow rate of 10 g / 10 min; Weigh 2 parts of antioxidant (168) with a purity greater than 99%; Weigh 3 parts of colorant; Put the weighed components into a high-speed mixer and mix them thoroughly; The mixing time is 8 minutes to ensure no agglomeration; The mixer speed is 1200 rpm; Add the mixed materials into a twin-screw extruder at 180°C; The screw speed is 150 rpm; After melt blending, the materials are extruded through the die head of the extruder and enter the cooling water tank for cooling; The cooled material is cut into uniform particles by a pelletizer; The water temperature of the cooling water tank is 25℃; The material is completely cooled to room temperature; The particle size is 3 mm.
[0026] The extrusion temperatures in each section are: Plasticizing section: 175℃; Homogenization section: 185℃; Discharging section: 195℃.
[0027] After the material is extruded through the die head of the extruder, it immediately enters a cooling water tank for cooling.
[0028] The particles are collected, dried, and surface moisture is removed to obtain an ultra-soft B1-level low-smoke halogen-free flame-retardant sheath material.
[0029] Embodiment 3
[0030] Calculated by mass, weigh 70 parts of polyethylene with a density of 0.96 g / cm³, a melt flow rate of 20 g / 10min, and an elongation at break of 800%; Weigh 150 parts of magnesium hydroxide with a particle size of 10 μm, a purity greater than 95%, and a decomposition temperature of 340°C; Weigh 20 parts of polyethylene wax; Weigh 10 parts of maleic anhydride grafted polyolefin with a compatibilizer grafting rate of 2% and a melt flow rate of 20 g / 10min; Weigh 5 parts of antioxidant (1010) with a purity greater than 99%; Weigh 3 parts of colorant; Put the weighed components into a high-speed mixer and mix them thoroughly; The mixing time is 10 minutes to ensure no agglomeration; The mixer speed is 1500 rpm; Add the mixed materials into a twin-screw extruder at 200°C; The screw speed is 200 rpm; After melt blending, the materials are extruded through the die head of the extruder and enter the cooling water tank for cooling; The cooled material is cut into uniform particles by a pelletizer; The water temperature of the cooling water tank is 30℃; The material is completely cooled to room temperature; The particle size is 4 mm.
[0031] The extrusion temperatures in each section are: Plasticizing section: 180℃; Homogenization section: 190℃; Discharging section: 200℃.
[0032] After the material is extruded through the die head of the extruder, it immediately enters a cooling water tank for cooling.
[0033] The particles are collected, dried, and surface moisture is removed to obtain an ultra-soft B1-level low-smoke halogen-free flame-retardant sheath material.
[0034] Embodiment 4
[0035] The difference from the third embodiment is that: Calculated by mass, weigh 70 parts of polyethylene with a density of 0.89 g / cm³, a melt flow rate of 10 g / 10min, and an elongation at break of 500%; Weigh 150 parts of aluminum hydroxide with a particle size of 10 μm, a purity greater than 95%, and a decomposition temperature of 220°C; Weigh 20 parts of polyethylene wax; Weigh 10 parts of maleic anhydride grafted polyolefin with a compatibilizer grafting rate of 2% and a melt flow rate of 20 g / 10min; Weigh 5 parts of antioxidant (1010) with a purity greater than 99%; Weigh 3 parts of colorant for preparation.
[0036] Embodiment 5
[0037] The difference from the fourth embodiment is that: Calculated by mass, weigh 50 parts of polyethylene with a density of 0.89 g / cm³, a melt flow rate of 10 g / 10min, and an elongation at break of 500%; Weigh 100 parts of aluminum hydroxide with a particle size of 10 μm, a purity greater than 95%, and a decomposition temperature of 220°C; Weigh 10 parts of oxidized polyethylene wax; Weigh 5 parts of maleic anhydride grafted polyolefin with a compatibilizer grafting rate of 2% and a melt flow rate of 20 g / 10min for preparation.
[0038] Weigh 5 parts of antioxidant (1010) with a purity greater than 99%; Weigh 5 parts of colorant to make it.
[0039] The low smoke zero halogen flame retardant sheath material meets the following performance indicators: Flame retardant performance: reach B1 grade; Smoke density: in accordance with GB / T 32129-2015 standard; Softness: Shore hardness is less than 70A.
[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A super soft B1 grade low smoke halogen free flame retardant sheath material, characterized in that , calculated by mass, including: 50-70 parts of polyolefin resin; 100-150 parts of inorganic flame retardant; 10-20 parts of softener; Compatibilizer 5-10 parts; 1 to 3 parts of antioxidant; 1 to 5 parts of colorant.
2. The ultra-soft B1-grade low-smoke halogen-free flame-retardant sheath material according to claim 1, characterized in that: The polyolefin resin is polyethylene or polypropylene; The melt flow rate of the polyolefin resin is 0.3 to 20 g / 10 min; The density of the polyethylene is 0.91 to 0.96 g / cm³, and the density of the polypropylene is 0.89 to 0.91 g / cm³; The elongation at break of the polyethylene is 100% to 800%, and the elongation at break of the polypropylene is 100% to 500%.
3. The ultra-soft B1-grade low-smoke halogen-free flame-retardant sheath material according to claim 1, characterized in that: The inorganic flame retardant is magnesium hydroxide or aluminum hydroxide; The inorganic flame retardant has a particle size of 1 to 10 μm to ensure good dispersibility; Purity is greater than 95% to reduce the impact of impurities on cable performance; The decomposition temperature of magnesium hydroxide is 320-340°C, and the decomposition temperature of aluminum hydroxide is 200-220°C.
4. The ultra-soft B1-level low-smoke halogen-free flame-retardant sheath material according to claim 1, characterized in that: The compatibilizer is maleic anhydride grafted polyolefin; The grafting rate of the compatibilizer is between 0.5% and 2%; The melt flow rate of polyolefin resin is consistent; The softener is polyethylene wax or oxidized polyethylene wax.
5. The ultra-soft B1-level low-smoke halogen-free flame-retardant sheath material according to claim 1, characterized in that: The antioxidant is 1010 or 168; The purity of the antioxidant should be greater than 99%.
6. A method for preparing a super soft B1 grade low smoke halogen free flame retardant sheath material according to any one of claims 1 to 5, characterized in that: The steps include: S1, high speed mixing Put the weighed components into a high-speed mixer and mix them thoroughly; The mixing time is 5 to 10 minutes to ensure that there is no agglomeration; The mixer speed is 1000-1500 rpm; S2. Melt blending Add the mixed materials into a twin-screw extruder at a temperature of 160°C to 200°C; The screw speed is 100-200 rpm; S3, extrusion granulation After melt blending, the materials are extruded through the die head of the extruder and enter the cooling water tank for cooling; The cooled material is cut into uniform particles by a pelletizer; The water temperature of the cooling water tank is 20℃~30℃; The material is completely cooled to room temperature; The particle size is 2 to 4 mm.
7. The method for preparing a super soft B1 grade low smoke halogen free flame retardant sheath material according to claim 6, characterized in that: The extrusion temperatures in each section are: Plasticizing section: 170℃~180℃; Homogenization section: 180℃~190℃; Discharging section: 190℃~200℃.
8. The method for preparing a super soft B1 grade low smoke halogen free flame retardant sheath material according to claim 6, characterized in that: After the material is extruded through the die head of the extruder, it immediately enters a cooling water tank for cooling.
9. The method for preparing a super soft B1 grade low smoke halogen-free flame retardant sheath material according to claim 6, characterized in that: The particles are collected, dried, and surface moisture is removed to obtain an ultra-soft B1-level low-smoke halogen-free flame-retardant sheath material.