Impact-resistant and high-temperature-resistant CPVC injection molding special material and preparation method thereof

Abstract

The invention provides a special impact-resistant and high-temperature-resistant CPVC (chlorinated polyvinyl chloride) injection molding material. The special impact-resistant and high-temperature-resistant CPVC injection molding material comprises the following raw materials in parts by weight: 60-80 parts of CPVC resin, 20-40 parts of PVC resin, 2-5 parts of a processing aid, 2-4 parts of a stabilizer, 3-15 parts of a flexibilizer, 0.6-4.0 parts of a lubricant and 0.5-1 part of titanium dioxide. The invention also provides a preparation method of the impact-resistant and high-temperature-resistant CPVC injection molding special material. The heat stability of the CPVC special material is improved by compounding the stabilizer, the impact resistance of a CPVC product is improved by adding the UFPSBR, the UFPNBR, the ABS high rubber powder and other flexibilizers, the flowability is improved, the processability is improved, and finally the CPVC injection molding special material which is excellent in mechanical property, resistant to high temperature and easy to process is prepared.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to an impact-resistant and high-temperature-resistant CPVC injection molding material and a preparation method thereof. Background Art

[0002] Chlorinated polyvinyl chloride (CPVC), made by chlorination modification of polyvinyl chloride (PVC) resin, is a new type of engineering plastic. The biggest feature of CPVC is that the content of chlorine element is greatly increased on the basis of PVC, thereby changing various physical properties of the material. Therefore, the CL content of CPVC is 63-69%, or even above 70%. The temperature resistance of CPVC is 30-40℃ higher than that of ordinary PVC materials, that is, its Vicat softening temperature can reach 103-110℃, and the long-term use temperature is also around 100℃. In addition, after chlorination of PVC resin, the irregularity of molecular bonds increases, and the chemical stability increases, which greatly improves the acid and alkali resistance of CPVC. Based on this, CPVC products can be widely used in chemical pipes, profiles, sheets and other fields.

[0003] However, the higher chlorine content of CPVC resin also leads to higher melt viscosity, poor fluidity, higher processing temperature and narrow processing range, easy decomposition, and reduced impact strength.

[0004] Therefore, when preparing corresponding CPVC products, how to improve their impact resistance, high temperature resistance, and processing performance is the key. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an impact-resistant and high-temperature-resistant CPVC injection molding material and a preparation method thereof. The CPVC injection molding material has excellent impact resistance, high-temperature resistance and good processing performance.

[0006] The present invention adopts the following technical solutions to solve the above technical problems:

[0007] The invention discloses an impact-resistant and high-temperature-resistant CPVC injection molding material, which comprises the following raw materials in parts by weight: 60-80 parts of CPVC resin, 20-40 parts of PVC resin, 2-5 parts of processing aid, 2-4 parts of stabilizer, 3-15 parts of toughening agent, 0.6-4.0 parts of lubricant and 0.5-1 parts of titanium dioxide.

[0008] As one of the preferred embodiments of the present invention, the CPVC resin has a degree of polymerization of 650 to 1050 and a chlorine content of 66.5 to 67.5%.

[0009] As one of the preferred embodiments of the present invention, the CPVC resin has an apparent density of 0.55-0.60 g / ml, a whiteness of 93-94%, and a Vicat softening point of 104-106°C.

[0010] As one of the preferred embodiments of the present invention, the processing aid is selected from at least one of methyl methacrylate / acrylate copolymer, methyl methacrylate / styrene copolymer and acrylonitrile / styrene.

[0011] As one of the preferred embodiments of the present invention, the stabilizer is compounded by a methyl tin mercaptan stabilizer having a tin content of 19.0 to 19.5% and a sulfur content of 10.5 to 12.5% ​​and a metal soap stabilizer.

[0012] As one of the preferred embodiments of the present invention, the toughening agent is at least one of fully vulcanized styrene-butadiene rubber, fully vulcanized nitrile-butadiene rubber, and ABS high-rubber powder, and more preferably a combination of the three.

[0013] As one of the preferred embodiments of the present invention, the fully vulcanized styrene-butadiene rubber is UFPSBR, with a diameter of 20 to 100 nm and a styrene content of 48 to 56%.

[0014] As one of the preferred embodiments of the present invention, the fully vulcanized nitrile rubber is UFPNBR with a diameter of 50 to 100 nm and an acrylonitrile content of 15 to 25%.

[0015] As one of the preferred embodiments of the present invention, the ABS high-rubber powder has a rubber content of 65-70% and a nitrile content of 26-28%.

[0016] As one of the preferred embodiments of the present invention, the lubricant is selected from at least one of oxidized polyethylene wax, monoglyceride and polyethylene wax.

[0017] As one of the preferred embodiments of the present invention, the titanium dioxide is rutile nano titanium dioxide.

[0018] A method for preparing the above-mentioned impact-resistant and high-temperature-resistant CPVC injection molding material comprises the following steps: adding the raw materials to a high-speed mixing pot of a high-speed and low-speed mixing unit according to the above-mentioned weight proportions, heating and high-speed mixing, and the mixing speed is 900-1500 r / min; raising the temperature of the high-speed mixing pot to 110-120° C. within 10-12 minutes, transferring the mixed material to a low-speed mixing pot, stirring and cooling to 45° C. at a speed of 300-500 r / min to obtain a CPVC premix; and extruding and granulating the CPVC premix through a twin-screw extruder to obtain a CPVC granular material, i.e., the target CPVC injection molding material.

[0019] The advantages of the present invention compared to the prior art are:

[0020] The invention improves the thermal stability (high temperature resistance) of CPVC special materials by compounding methyl tin mercaptide and metal soap stabilizers, improves the impact resistance of CPVC products by adding toughening agents such as UFPSBR, UFPNBR, ABS high-rubber powder, etc., increases fluidity, and improves processing performance, and finally obtains CPVC special injection molding materials with excellent mechanical properties, high temperature resistance, and good processing, which can meet product requirements in multiple fields such as chemical equipment manufacturing, automobile manufacturing, and medical equipment. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below. The present embodiments are implemented under the premise of the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments. Meanwhile, the raw materials used in the following embodiments are conventional raw materials and reagents in this field unless otherwise specified. The experimental conditions and experimental methods used are conventional conditions and methods in this field unless otherwise specified, and will not be repeated.

[0022] Example 1

[0023] The impact-resistant and high-temperature-resistant CPVC injection molding material of this embodiment includes the following raw materials in parts by weight:

[0024] CPVC resin (chlorine content 66.5%, apparent density 0.55g / ml, whiteness 93%, polymerization degree 650,

[0025] Preparation method:

[0026] According to the above weight proportions, the raw materials are added into the high-speed mixing pot of the high-low speed mixing unit, heated and mixed at a high speed, and the mixing speed is 900r / min; within 10min, after the temperature of the high-speed mixing pot is raised to 110°C, the mixture is transferred into the low-speed mixing pot, stirred and cooled to 45°C at a speed of 300r / min to obtain a CPVC premix; the CPVC premix is ​​extruded and granulated by a twin-screw extruder to obtain a CPVC granular material, i.e., the target CPVC injection molding special material.

[0027] Example 2

[0028] The impact-resistant and high-temperature-resistant CPVC injection molding material of this embodiment includes the following raw materials in parts by weight:

[0029] CPVC resin (chlorine content 67.1%, apparent density 0.60g / ml, whiteness 93.4%, polymerization degree 700,

[0030]

[0031] Preparation method:

[0032] According to the above weight proportions, each raw material is added to the high-speed mixing pot of the high-low speed mixing unit, heated and mixed at a high speed, and the mixing speed is 1000r / min; within 10 minutes, after the temperature of the high-speed mixing pot is raised to 115°C, the mixture is transferred to the low-speed mixing pot, stirred and cooled to 45°C at a speed of 400r / min to obtain a CPVC premix; the CPVC premix is ​​extruded and granulated by a twin-screw extruder to obtain a CPVC granular material, that is, the target CPVC injection molding special material.

[0033] Example 3

[0034] The impact-resistant and high-temperature-resistant CPVC injection molding material of this embodiment includes the following raw materials in parts by weight:

[0035] CPVC resin (chlorine content 67.1%, apparent density 0.60g / ml, whiteness 93.4%, polymerization degree 700,

[0036]

[0037] Preparation method:

[0038] According to the above weight proportions, the raw materials are added into the high-speed mixing pot of the high-low speed mixing unit, heated and mixed at a high speed, and the mixing speed is 1200r / min; within 11 minutes, after the temperature of the high-speed mixing pot is raised to 115°C, the mixture is transferred into the low-speed mixing pot, stirred and cooled to 45°C at a speed of 400r / min to obtain a CPVC premix; the CPVC premix is ​​extruded and granulated by a twin-screw extruder to obtain a CPVC granular material, i.e., the target CPVC injection molding special material.

[0039] Example 4

[0040] The impact-resistant and high-temperature-resistant CPVC injection molding material of this embodiment includes the following raw materials in parts by weight:

[0041] CPVC resin (chlorine content 67.5%, apparent density 0.58g / ml, whiteness 93.5%, degree of polymerization 1050,

[0042] Preparation method:

[0043] According to the above weight proportions, each raw material is added to the high-speed mixing pot of the high-low speed mixing unit, heated and mixed at a high speed, and the mixing speed is 1500r / min; within 12 minutes, after the temperature of the high-speed mixing pot is raised to 120°C, the mixture is transferred to the low-speed mixing pot, stirred and cooled to 45°C at a speed of 500r / min to obtain a CPVC premix; the CPVC premix is ​​extruded and granulated by a twin-screw extruder to obtain a CPVC granular material, that is, the target CPVC injection molding special material.

[0044] Comparative Example 1

[0045] The formula and preparation method of a CPVC special injection molding material in this comparative example are basically the same as those in Example 2, the main difference being that no methyl tin mercaptan stabilizer is added.

[0046] Comparative Example 2

[0047] The formula and preparation method of a CPVC injection molding material in this comparative example are basically the same as those in Example 2, the main difference being that no metal soap stabilizer is added.

[0048] Comparative Example 3

[0049] The formula and preparation method of a CPVC injection molding material in this comparative example are basically the same as those in Example 2, except that no methyl tin mercaptan stabilizer and metal soap stabilizer are added.

[0050] Comparative Example 4

[0051] The formula and preparation method of a CPVC injection molding material in this comparative example are basically the same as those in Example 2, the main difference being that no UFPSBR is added.

[0052] Comparative Example 5

[0053] The formula and preparation method of a CPVC special injection molding material in this comparative example are basically the same as those in Example 2, the main difference being that no UFPNBR is added.

[0054] Comparative Example 6

[0055] The formula and preparation method of a CPVC injection molding material in this comparative example are basically the same as those in Example 2, the main difference being that no ABS high-rubber powder is added.

[0056] Comparative Example 7

[0057] The formula and preparation method of a CPVC injection molding material in this comparative example are basically the same as those in Example 2, the main difference being that no UFPSBR, UFPNBR and ABS high-rubber powder are added.

[0058] Experimental Example 1

[0059] This experimental example is used to verify the effect of the "stabilizer" of the present invention on the performance of CPVC injection molded products.

[0060] The pellets of the present invention (Example 2) and comparative examples 1, 2, and 3 were injection molded respectively, and tested with the test specimens required by the pellet injection molding test method. The rheological curve was tested on a Kechuang XSS-300 torque rheometer using the pellets at a temperature of 175°C and a rotor speed of 60r / min. The test results are shown in Table 1.

[0061] Table 1 Performance data of the present invention and comparative examples 1 to 3

[0062]

[0063] It can be seen from Table 1 that: when other conditions remain unchanged and the raw materials do not contain any stabilizer, the plasticizing torque of the material is high, and the thermal stability, impact resistance and bending properties will all decrease; when a single-component stabilizer is added, it cannot meet the sufficient thermal stability requirements, and the plasticizing torque of the material is high, and the impact resistance and bending properties will all decrease; this shows that only by compounding the target stabilizer can the plasticizing torque be significantly reduced and the thermal stability can be improved.

[0064] Experimental Example 2

[0065] This experimental example is used to verify the effect of adding the "toughening agent" of the present invention on the performance of CPVC injection molded products.

[0066] The pellets of the present invention (Example 2) and comparative examples 4, 5, 6, and 7 were injection molded respectively, and tested with the test specimens required by the pellet injection molding test method. The rheological curve was tested on a Kechuang XSS-300 torque rheometer using the pellets at a temperature of 175°C and a rotor speed of 60r / min. The test results are shown in Table 2.

[0067] Table 2 Performance data of the present invention and comparative examples 4 to 7

[0068]

[0069] It can be seen from Table 2 that: when other conditions remain unchanged and the raw material does not contain any toughening agent, the impact resistance of the material is greatly reduced, and the plasticizing torque is high and the thermal stability is reduced; when one or two target toughening agents are added, although the performance is improved compared with the material of Example 2 of the present invention, the various properties of the material are still reduced; this shows that through the compounding of toughening agents, the balanced requirements of impact resistance, plasticizing torque and thermal stability can be achieved, and a long thermal stability time, a high Vicat softening temperature, a low plasticizing torque and easy processing are achieved, and the notched impact strength and flexural strength are both better.

[0070] 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 and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A special CPVC injection molding material with impact resistance and high temperature resistance, characterized in that: The invention comprises the following raw materials in parts by weight: 60-80 parts of CPVC resin, 20-40 parts of PVC resin, 2-5 parts of processing aid, 2-4 parts of stabilizer, 3-15 parts of toughening agent, 0.6-4.0 parts of lubricant and 0.5-1 parts of titanium dioxide.

2. The impact-resistant and high-temperature-resistant CPVC injection molding material according to claim 1 is characterized in that: The CPVC resin has a polymerization degree of 650-1050 and a chlorine content of 66.5-67.5%.

3. The impact-resistant and high-temperature-resistant CPVC injection molding material according to claim 2 is characterized in that The CPVC resin has an apparent density of 0.55-0.60 g / ml, a whiteness of 93-94%, and a Vicat softening point of 104-106°C.

4. The impact-resistant and high-temperature-resistant CPVC injection molding material according to claim 1 is characterized in that: The processing aid is selected from at least one of methyl methacrylate / acrylate copolymer, methyl methacrylate / styrene copolymer and acrylonitrile / styrene.

5. The impact-resistant and high-temperature-resistant CPVC injection molding material according to claim 1 is characterized in that: The stabilizer is prepared by compounding a methyltin mercaptan stabilizer having a tin content of 19.0-19.5% and a sulfur content of 10.5-12.5% ​​and a metal soap stabilizer.

6. The impact-resistant and high-temperature-resistant CPVC injection molding material according to claim 1, characterized in that: The toughening agent is at least one of fully vulcanized styrene-butadiene rubber, fully vulcanized nitrile-butadiene rubber, and ABS high-rubber powder.

7. The impact-resistant and high-temperature-resistant CPVC injection molding material according to claim 6 is characterized in that: The fully vulcanized styrene butadiene rubber has a diameter of 20-100nm and a styrene content of 48-56%, the fully vulcanized nitrile butadiene rubber has a diameter of 50-100nm and an acrylonitrile content of 15-25%, and the ABS high-rubber powder has a rubber content of 65-70% and a nitrile content of 26-28%.

8. The impact-resistant and high-temperature-resistant CPVC injection molding material according to claim 1 is characterized in that: The lubricant is selected from at least one of oxidized polyethylene wax, monoglyceride and polyethylene wax.

9. The impact-resistant and high-temperature-resistant CPVC injection molding material according to claim 1, characterized in that: The titanium dioxide is rutile nano titanium dioxide.

10. A method for preparing the impact-resistant and high-temperature-resistant CPVC injection molding material according to any one of claims 1 to 9, characterized in that: According to the above weight proportions, the raw materials are added into the high-speed mixing pot of the high-speed and low-speed mixing unit for heating and high-speed mixing, and the mixing speed is 900-1500 r / min; within 10-12 minutes, after the temperature of the high-speed mixing pot is raised to 110-120° C., the mixed material is transferred into the low-speed mixing pot, stirred and cooled to 45° C. at a speed of 300-500 r / min to obtain a CPVC premix; the CPVC premix is ​​extruded and granulated by a twin-screw extruder to obtain a CPVC granular material, i.e., the target CPVC injection molding special material.

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