CN114634595B - Maleic anhydride grafted polypropylene wax and preparation method thereof - Google Patents
Maleic anhydride grafted polypropylene wax and preparation method thereof Download PDFInfo
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Abstract
The invention relates to maleic anhydride grafted polypropylene and a preparation method thereof. The maleic anhydride grafted polypropylene formula comprises the following components in parts by weight: 100 parts of polypropylene, 3-5 parts of maleic anhydride, 0.3-0.8 part of initiator, 3-6 parts of grafting synergist and 0.1-0.3 part of antioxidant. The invention takes the glycidyl methacrylate and the phosphate compound as a grafting synergist, and the prepared maleic anhydride grafted polypropylene wax has high grafting rate.
Description
Technical Field
The invention relates to the technical field of modification of high polymer materials, in particular to a maleic anhydride grafted polypropylene material and a preparation method thereof.
Background
As a low molecular weight polypropylene material, the polypropylene wax has the advantages of good toughness, lubricity, moisture resistance, wide melt viscosity and the like, and is widely used for plastic additives, hot melt adhesives, rubber processing aids and the like. However, because polypropylene waxes are non-polar materials, they are difficult to be compatible with polar polymers or polar inorganic reinforcing materials, severely affecting the material properties of composites comprising polypropylene waxes. The molecular polarity of polypropylene can be effectively improved by grafting polypropylene with maleic anhydride. The grafting methods commonly used at present are a solution method, a melting method, a solid phase method and the like, wherein the melting method is the most widely used grafting method at present due to the advantages of simple operation, low processing cost, continuous production and the like.
The grafting rate directly affects the performance of the maleic anhydride grafted polypropylene product. In general, the higher the grafting, the higher the reactivity of the graft product and the better the composite properties comprising the product. However, the polypropylene can be degraded under the action of a free radical initiator in the grafting process, so that the grafting rate of the maleic anhydride grafted polypropylene is seriously affected. The method for improving the grafting rate commonly used at present comprises the following steps: styrene or acrylic monomers are added as grafting auxiliary agents in the grafting process, so that the degradation degree of polypropylene is reduced, and the grafting rate is further improved. However, the styrene molecule contains benzene rings, and reaction residues can cause great harm to the environment during industrial production; the acrylic ester grafting auxiliary agent is a high-reactivity substance, and self-polymerization easily occurs in the grafting process, so that the grafting rate of the grafting reaction is affected. Thus, how to increase the grafting rate of maleic anhydride grafted polypropylene wax has been a problem to be solved in the art.
Disclosure of Invention
Based on this, the main object of the present invention is to provide a maleic anhydride grafted polypropylene wax with high grafting ratio. The raw materials of the maleic anhydride grafted polypropylene wax are environment-friendly, and the grafting synergist can improve the grafting rate.
The invention aims at realizing the following technical scheme:
the invention mainly aims to provide maleic anhydride grafted polypropylene wax, which comprises the following raw materials in parts by weight: 100 parts of polypropylene wax, 3-5 parts of maleic anhydride, 3-6 parts of grafting synergist, 0.3-0.8 part of initiator and 0.1-0.3 part of antioxidant, wherein the grafting synergist is a compound of glycidyl methacrylate and phosphate.
In one embodiment, the mass ratio of glycidyl methacrylate to phosphate is 5 to 10:1.
in one embodiment, the phosphate is tributyl phosphate or trioctyl phosphate.
In one embodiment, the initiator is an organic peroxide comprising one or more of t-butyl peroxypivalate, dicumyl peroxide, di-t-butyl peroxide, and lauroyl peroxide.
In one embodiment, the antioxidant is a combination of hindered phenolic antioxidant 1010 and phosphite antioxidant 168.
In one embodiment, the mass ratio of hindered phenolic antioxidant 1010 to phosphite antioxidant 168 is 1 to 2:1.
in one embodiment, the polypropylene wax is polymerized from propylene monomers or cracked from petroleum, and the relative molecular mass of the polypropylene wax is 4000-8000.
The invention also provides a preparation method of the maleic anhydride grafted polypropylene wax, which comprises the following steps:
mixing and melting the maleic anhydride, the initiator and the grafting synergist to prepare a melt; and adding the mixed liquid of the polypropylene wax and the antioxidant into the melt liquid to carry out grafting reaction.
In one embodiment, the rate of loading of the melt is 20 to 50 ml/min.
In one embodiment, the grafting reaction is carried out at a temperature of 180 to 190℃and for a time of 4 to 5 hours.
It is still another object of the present invention to provide a polypropylene composite material comprising the maleic anhydride grafted polypropylene as described above and a polar material.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) According to the maleic anhydride grafted polypropylene wax, the compound of glycidyl methacrylate and phosphate is used as a grafting synergist to replace the traditional grafting auxiliary agent styrene, so that the maleic anhydride grafted polypropylene wax is more environment-friendly; and higher grafting than that obtained when glycidyl methacrylate is used alone. (2) The preparation method of the maleic anhydride grafted polypropylene wax provided by the invention is simple to operate and controllable in reaction rate. (3) The polypropylene composite material provided by the invention has the advantages of high compatibility between the maleic anhydride grafted polypropylene wax and the polar material, good dispersibility and good lubricity.
Drawings
FIG. 1 is a scanning electron microscope image of the polypropylene composite material prepared in example 4.
Detailed Description
The present invention will be described more fully hereinafter in order to facilitate an understanding of the present invention. Preferred embodiments of the present invention are given below. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In the present invention, the numerical ranges are referred to as continuous, and include the minimum and maximum values of the ranges, and each value between the minimum and maximum values, unless otherwise specified. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range description features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to include any and all subranges subsumed therein.
The temperature parameter in the present invention is not particularly limited, and may be a constant temperature treatment or a treatment within a predetermined temperature range. The constant temperature process allows the temperature to fluctuate within the accuracy of the instrument control.
The invention provides maleic anhydride grafted polypropylene wax, which comprises the following raw materials in parts by weight: 100 parts of polypropylene wax, 3-5 parts of maleic anhydride, 3-6 parts of grafting synergist, 0.3-0.8 part of initiator and 0.1-0.3 part of antioxidant, wherein the grafting synergist is a compound of glycidyl methacrylate and phosphate.
In the traditional method, the grafting auxiliary agent adopted in the maleic anhydride grafted polypropylene formula system is mainly styrene and acrylic esters, wherein the styrene auxiliary agent is extremely not environment-friendly because the styrene auxiliary agent contains benzene rings, has high reactivity, and is easy to self-polymerize with maleic anhydride, thereby influencing the grafting rate. In order to solve the limitation of the prior art and further improve the grafting rate, the invention selects the compound of glycidyl methacrylate and phosphate as a grafting synergist, and can effectively improve the grafting rate. Wherein the addition of glycidyl methacrylate can inhibit polypropylene degradation and free radical capping; the phosphate can inhibit self-polymerization of glycidyl methacrylate and maleic anhydride, and the two react together to improve the reaction grafting rate.
In one example, the mass ratio of glycidyl methacrylate to phosphate is 5 to 10:1.
further, the phosphate is tributyl phosphate or trioctyl phosphate.
In one example, the initiator is an organic peroxide comprising one or more of t-butyl peroxypivalate, dicumyl peroxide, di-t-butyl peroxide, and lauroyl peroxide.
In one example, the antioxidant is a combination of a hindered phenolic antioxidant 1010 and a phosphite antioxidant 168.
Further, the mass ratio of the hindered phenol antioxidant 1010 to the phosphite antioxidant 168 is 1-2: 1.
in one example, the polypropylene wax is polymerized from propylene monomers or cracked from petroleum, and the relative molecular mass of the polypropylene wax is 4000-8000. Further, the polypropylene wax is polymerized by propylene monomers or obtained by petroleum pyrolysis, and the relative molecular weight of the polypropylene wax is 5000-7000.
In one example, the maleic anhydride grafted polypropylene wax is prepared from the following raw materials in parts by weight: 100 parts of polypropylene wax, 4-5 parts of maleic anhydride, 4-6 parts of grafting synergist, 0.5-0.8 part of initiator and 0.2-0.3 part of antioxidant, wherein the grafting synergist is a compound of glycidyl methacrylate and phosphate.
The invention provides a preparation method of the maleic anhydride grafted polypropylene wax, which comprises the following steps:
mixing and melting the maleic anhydride, the initiator and the grafting synergist to prepare a melt; and adding the mixed liquid of the polypropylene wax and the antioxidant into the melt liquid to carry out grafting reaction.
In one example, the rate of loading of the melt is 20 to 50 ml/min. In the preparation process of the maleic anhydride grafted polypropylene wax, the traditional method is to mix maleic anhydride and polypropylene wax first, and then add initiator and grafting auxiliary agent for many times. In order to solve the problem, the method adopted by the invention is to uniformly mix the maleic anhydride, the initiator and the grafting synergist, and then add the mixture into the polypropylene wax at a certain speed, so that the materials can be uniformly mixed, the operation is simple, and the reaction rate is controllable.
In one example, the grafting reaction is carried out at a temperature of 180 to 190℃and for a time of 4 to 5 hours.
The invention also provides a polypropylene composite material which comprises the maleic anhydride grafted polypropylene and a polar material.
The higher the grafting rate of the maleic anhydride grafted polypropylene wax, the more polar monomers are contained in the grafted product molecule, and the better the compatibility with inorganic matters and/or other polar materials is. The grafting product obtained by the method has high grafting rate, and can effectively improve the compatibility and the dispersibility between materials after being compounded with other polar materials, thereby improving the usability of the polypropylene composite material.
The following are specific examples.
In the following examples and comparative examples, the polypropylene wax is prepared by polymerizing propylene monomers or by petroleum cracking, and the relative molecular weight of the polypropylene wax is 4000 to 8000.
In the following examples and comparative examples, since the reaction kettle heating process was difficult to stabilize at a certain fixed value, the reaction kettle heating temperature was a range value.
Example 1: preparation of maleic anhydride grafted polypropylene wax
The mass distribution of each component in the maleic anhydride grafted polypropylene wax reaction is shown in table 1. The preparation method comprises the following steps:
1. 100 parts of polypropylene wax and 0.1 part of antioxidant are put into a reaction kettle, after nitrogen replacement is carried out for three times, the reaction kettle is heated to 130-140 ℃ under the protection of nitrogen, and the polypropylene wax is melted, wherein the antioxidant is antioxidant 1010 and antioxidant 168 with the mass ratio of 1:1, a mixture of two or more of the above-mentioned materials;
2. mixing and melting 3 parts of maleic anhydride, 0.3 part of dicumyl peroxide and 3 parts of grafting synergist to uniform liquid, and putting the uniform liquid into a monomer storage tank for standby, wherein the grafting synergist is glycidyl methacrylate and tributyl phosphate with the mass ratio of 10:1, a mixture of two or more of the above-mentioned materials;
3. after the polypropylene wax in the step 1 is completely melted, the temperature of the reaction kettle is increased to 180-190 ℃, and nitrogen is used for protection in the heating and melting process;
4. starting a stirring motor of the reaction kettle, wherein the rotating speed of the motor is 80 revolutions per minute;
5. closing a valve of the horizontal condenser, opening cooling water and an air valve of the vertical condenser pipe, and sealing the air pipe in a water way;
6. injecting the mixed monomer in the step 2 into a reaction kettle at a speed of 30 milliliters/minute through a liquid pump, and closing the liquid pump after the liquid monomer is added;
7. closing a valve of the horizontal condenser, opening cooling water and an air valve of the vertical condenser pipe, and sealing the air pipe in a water way;
8. after the melt grafting reaction is carried out for 4.5 hours, a valve of a horizontal condenser is opened, and nitrogen is introduced into the reaction kettle for 2-3 hours;
9. cooling the reaction kettle to 140-150 ℃, discharging, cooling, and crushing to obtain a maleic anhydride grafted polypropylene wax product which is named as PPW-MAH-1.
Example 2: preparation of maleic anhydride grafted polypropylene wax
The preparation method of example 2 is substantially the same as that of example 1, except that: the amounts of antioxidant, grafting synergist and initiator added were different from those in example 1; the specific mass ratios of the components are shown in table 1.
The method comprises the following specific steps:
1. 100 parts of polypropylene wax and 0.2 part of antioxidant are put into a reaction kettle, after nitrogen replacement is carried out for three times, the reaction kettle is heated to 130-140 ℃ under the protection of nitrogen, and the polypropylene wax is melted, wherein the antioxidant is antioxidant 1010 and antioxidant 168 with the mass ratio of 1:1, a mixture of two or more of the above-mentioned materials;
2. mixing and melting 3 parts of maleic anhydride, 0.5 part of dicumyl peroxide and 4 parts of grafting synergist to uniform liquid, and putting the uniform liquid into a monomer storage tank for standby, wherein the grafting synergist is glycidyl methacrylate and tributyl phosphate with the mass ratio of 10:1, a mixture of two or more of the above-mentioned materials;
3. after the polypropylene wax in the step 1 is completely melted, the temperature of the reaction kettle is increased to 180-190 ℃, and nitrogen is used for protection in the heating and melting process;
4. starting a stirring motor of the reaction kettle, wherein the rotating speed of the motor is 80 revolutions per minute;
5. closing a valve of the horizontal condenser, opening cooling water and an air valve of the vertical condenser pipe, and sealing the air pipe in a water way;
6. injecting the mixed monomer in the step 2 into a reaction kettle at a speed of 30 milliliters/minute through a liquid pump, and closing the liquid pump after the liquid monomer is added;
7. closing a valve of the horizontal condenser, opening cooling water and an air valve of the vertical condenser pipe, and sealing the air pipe in a water way;
8. after the melt grafting reaction is carried out for 4.5 hours, a valve of a horizontal condenser is opened, and nitrogen is introduced into the reaction kettle for 2-3 hours;
9. cooling the reaction kettle to 140-150 ℃, discharging, cooling, and crushing to obtain a maleic anhydride grafted polypropylene wax product which is named as PPW-MAH-2.
Example 3: preparation of maleic anhydride grafted polypropylene wax
The preparation method of example 3 is substantially the same as that of example 1, except that: the amounts of antioxidant, grafting synergist and initiator added were different from those in example 1; the specific mass ratios of the components are shown in table 1.
The method comprises the following specific steps:
1. 100 parts of polypropylene wax and 0.3 part of antioxidant are put into a reaction kettle, after nitrogen replacement is carried out for three times, the reaction kettle is heated to 130-140 ℃ under the protection of nitrogen, and the polypropylene wax is melted, wherein the antioxidant is antioxidant 1010 and antioxidant 168 with the mass ratio of 1:1, a mixture of two or more of the above-mentioned materials;
2. 5 parts of maleic anhydride, 0.8 part of dicumyl peroxide and 6 parts of grafting synergist are mixed and melted into uniform liquid, and the uniform liquid is put into a monomer storage tank for standby, wherein the grafting synergist is glycidyl methacrylate and tributyl phosphate with the mass ratio of 10:1, a mixture of two or more of the above-mentioned materials;
3. after the polypropylene wax in the step 1 is completely melted, the temperature of the reaction kettle is increased to 180-190 ℃, and nitrogen is used for protection in the heating and melting process;
4. starting a stirring motor of the reaction kettle, wherein the rotating speed of the motor is 80 revolutions per minute;
5. closing a valve of the horizontal condenser, opening cooling water and an air valve of the vertical condenser pipe, and sealing the air pipe in a water way;
6. injecting the mixed monomer in the step 2 into a reaction kettle at a speed of 30 milliliters/minute through a liquid pump, and closing the liquid pump after the liquid monomer is added;
7. closing a valve of the horizontal condenser, opening cooling water and an air valve of the vertical condenser pipe, and sealing the air pipe in a water way;
8. after the melt grafting reaction is carried out for 4.5 hours, a valve of a horizontal condenser is opened, and nitrogen is introduced into the reaction kettle for 2-3 hours;
9. cooling the reaction kettle to 140-150 ℃, discharging, cooling, and crushing to obtain a maleic anhydride grafted polypropylene wax product which is named as PPW-MAH-3.
Comparative example 1: preparation of maleic anhydride grafted Polypropylene wax (without grafting synergist)
The preparation method of comparative example 1 was substantially the same as that of example 1, except that: the key components of the grafting synergist, namely glycidyl methacrylate and tributyl phosphate, are omitted. The contents of the remaining components were exactly the same as in example 2. The specific mass ratios of the components are shown in table 1.
The method comprises the following specific steps:
1. 100 parts of polypropylene wax and 0.2 part of antioxidant are put into a reaction kettle, after nitrogen replacement is carried out for three times, the reaction kettle is heated to 130-140 ℃ under the protection of nitrogen, and the polypropylene wax is melted, wherein the antioxidant is antioxidant 1010 and antioxidant 168 with the mass ratio of 1:1, a mixture of two or more of the above-mentioned materials;
2. mixing and melting 3 parts of maleic anhydride and 0.5 part of dicumyl peroxide to uniform liquid, and putting the mixture into a monomer storage tank for standby;
3. after the polypropylene wax in the step 1 is completely melted, the temperature of the reaction kettle is increased to 180-190 ℃, and nitrogen is used for protection in the heating and melting process;
4. starting a stirring motor of the reaction kettle, wherein the rotating speed of the motor is 80 revolutions per minute;
5. closing a valve of the horizontal condenser, opening cooling water and an air valve of the vertical condenser pipe, and sealing the air pipe in a water way;
6. injecting the mixed monomer in the step 2 into a reaction kettle at a speed of 30 milliliters/minute through a liquid pump, and closing the liquid pump after the liquid monomer is added;
7. closing a valve of the horizontal condenser, opening cooling water and an air valve of the vertical condenser pipe, and sealing the air pipe in a water way;
8. after the melt grafting reaction is carried out for 4.5 hours, a valve of a horizontal condenser is opened, and nitrogen is introduced into the reaction kettle for 2-3 hours;
9. and cooling the reaction kettle to 140-150 ℃, discharging, cooling, and crushing to obtain a maleic anhydride grafted polypropylene wax product.
Comparative example 2: preparation of maleic anhydride grafted Polypropylene wax (without tributyl phosphate)
The preparation method of comparative example 2 was substantially the same as that of example 1, except that: the tributyl phosphate in the key component grafting synergist is omitted, namely the glycidyl methacrylate is used for replacing the tributyl phosphate and glycidyl methacrylate compound with the same quality. The contents of the remaining components were exactly the same as in example 2. The specific mass ratios of the components are shown in table 1.
The method comprises the following specific steps:
1. 100 parts of polypropylene wax and 0.2 part of antioxidant are put into a reaction kettle, after nitrogen replacement is carried out for three times, the reaction kettle is heated to 130-140 ℃ under the protection of nitrogen, and the polypropylene wax is melted, wherein the antioxidant is antioxidant 1010 and antioxidant 168 with the mass ratio of 1:1, a mixture of two or more of the above-mentioned materials;
2. mixing and melting 3 parts of maleic anhydride, 0.5 part of dicumyl peroxide and 4 parts of glycidyl methacrylate to uniform liquid, and putting the mixture into a monomer storage tank for standby;
3. after the polypropylene wax in the step 1 is completely melted, the temperature of the reaction kettle is increased to 180-190 ℃, and nitrogen is used for protection in the heating and melting process;
4. starting a stirring motor of the reaction kettle, wherein the rotating speed of the motor is 80 revolutions per minute;
5. closing a valve of the horizontal condenser, opening cooling water and an air valve of the vertical condenser pipe, and sealing the air pipe in a water way;
6. injecting the mixed monomer in the step 2 into a reaction kettle at a speed of 30 milliliters/minute through a liquid pump, and closing the liquid pump after the liquid monomer is added;
7. closing a valve of the horizontal condenser, opening cooling water and an air valve of the vertical condenser pipe, and sealing the air pipe in a water way;
8. after the melt grafting reaction is carried out for 4.5 hours, a valve of a horizontal condenser is opened, and nitrogen is introduced into the reaction kettle for 2-3 hours;
9. cooling the reaction kettle to 140-150 ℃, discharging, cooling, and crushing to obtain a maleic anhydride grafted polypropylene wax product
TABLE 1 mass ratios of the components
The maleic anhydride-grafted acrylic waxes prepared in examples 1 to 3 and comparative examples 1 to 2 and commercially available maleic anhydride-grafted polypropylene wax were subjected to acid-base titration to determine the grafting ratio, and the test results are shown in Table 2 below. Wherein, the commercial product of the maleic anhydride grafted polypropylene wax is sold by the chemical industry product company of Clariant, and the product model is MA6252 GR.
The grafting ratio test standard is T/ZZB0523-2018.
TABLE 2 grafting test results
As can be seen from Table 2 above, the grafting rates of examples 1-3 are all significantly higher than those of comparative examples 1-2 and the commercially available product maleic anhydride grafted polypropylene wax. Specifically, as can be seen from the data of example 2 and comparative example 1 (only no grafting synergist was added, and the other parameters were the same), the grafting yield can be significantly improved by adding the grafting synergist of the present invention. From the data of comparative examples 1 and 2 (omitting the phosphate component in the grafting synergist, the other parameters being the same), it can be seen that the grafting ratio can be improved by adding only glycidyl methacrylate, but the improvement is small; further comparing the results of example 2 with comparative example 2, it can be seen that the grafting ratio of the product can be greatly improved when the phosphate and glycidyl methacrylate are added for compounding.
Example 4: preparation of Polypropylene composite material
3 parts of the maleic anhydride grafted polypropylene wax PPW-MAH-2 obtained in example 2, 66.5 parts of (ungrafted) polypropylene, 30 parts of calcium carbonate, 0.2 part of antioxidant 1010 and 0.3 part of antioxidant 168 are uniformly mixed and then put into a double screw extruder for granulation to obtain the polypropylene composite material. The resulting composite was tested for tensile strength, elongation at break, flexural strength, notched Izod impact strength and dispersion effect, and the test results are shown in Table 3 and FIG. 1 below.
Comparative example 3: preparation of Polypropylene composite material
The preparation method of comparative example 3 was substantially the same as that of example 4, except that: the maleic anhydride grafted polypropylene wax obtained in example 2 was replaced with 3 parts of (ungrafted) polypropylene of equal quality. The contents of the remaining components were exactly the same as in example 4. The specific method comprises the following steps: 69.5 parts of (ungrafted) polypropylene, 30 parts of calcium carbonate, 0.2 part of antioxidant 1010 and 0.3 part of antioxidant 168 are uniformly mixed and then put into a double-screw extruder for granulation to obtain the polypropylene composite material. The resulting composite was tested for tensile strength, elongation at break, flexural strength, notched Izod impact strength and dispersion effect and the test results are shown in Table 3 below.
Comparative example 4: preparation of Polypropylene composite material
The preparation method of comparative example 4 was substantially the same as that of example 4, except that: the maleic anhydride-grafted polypropylene wax obtained in example 2 was replaced with 3 parts of commercially available maleic anhydride-grafted polypropylene. The contents of the remaining components were exactly the same as in example 4. The specific method comprises the following steps: 3 parts of commercial maleic anhydride grafted polypropylene, 66.5 parts of (ungrafted) polypropylene, 30 parts of calcium carbonate, 0.2 part of antioxidant 1010 and 0.3 part of antioxidant 168 are uniformly mixed and then put into a double-screw extruder for granulation to obtain the polypropylene composite material. The resulting composite was tested for tensile strength, elongation at break, flexural strength, notched Izod impact strength and dispersion effect and the test results are shown in Table 3 below.
TABLE 3 comparison of the proportions of the components and the Material Properties of the Polypropylene composite Material
As can be seen from the data in Table 3 and FIG. 1, the product PPW-MAH-2 prepared by the preparation method of the invention can be applied to polyolefin composite materials, and can effectively improve the compatibility, lubrication and dispersion effects among the materials.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. The maleic anhydride grafted polypropylene wax is characterized by comprising the following raw materials in parts by weight: 100 parts of polypropylene wax, 3-5 parts of maleic anhydride, 3-6 parts of grafting synergist, 0.3-0.8 part of initiator and 0.1-0.3 part of antioxidant, wherein the grafting synergist is a compound of glycidyl methacrylate and phosphate; the phosphate is selected from one or two of tributyl phosphate and trioctyl phosphate.
2. The maleic anhydride grafted polypropylene wax according to claim 1, wherein the mass ratio of glycidyl methacrylate to phosphate is 5-10:1.
3. The maleic anhydride grafted polypropylene wax according to any of claims 1 to 2, wherein the initiator is an organic peroxide selected from one or more of t-butyl peroxypivalate, dicumyl peroxide, di-t-butyl peroxide and lauroyl peroxide.
4. The maleic anhydride grafted polypropylene wax according to any of claims 1 to 2, wherein the antioxidant is a combination of hindered phenolic antioxidant 1010 and phosphite antioxidant 168, wherein the mass ratio of hindered phenolic antioxidant 1010 to phosphite antioxidant 168 is 1-2:1.
5. The maleic anhydride grafted polypropylene wax according to any of claims 1 to 2, wherein the polypropylene wax is polymerized from propylene monomers or is obtained by petroleum cracking, and the polypropylene wax has a relative molecular mass of 4000 to 8000.
6. The method for preparing maleic anhydride grafted polypropylene wax according to any of claims 1 to 5, wherein the method comprises the steps of:
mixing and melting the maleic anhydride, the initiator and the grafting synergist to prepare a melt; and adding the mixed liquid of the polypropylene wax and the antioxidant into the melt liquid to carry out grafting reaction.
7. The method for preparing maleic anhydride grafted polypropylene wax according to claim 6, wherein the rate of loading of the melt is 20 to 50 ml/min.
8. The method for preparing maleic anhydride grafted polypropylene wax according to any of claims 6 to 7, wherein the temperature of the grafting reaction is 180 to 190 ℃ and the time of the grafting reaction is 4 to 5 hours.
9. A polypropylene composite comprising the maleic anhydride grafted polypropylene wax of any of claims 1-5, and other polar materials.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003277449A (en) * | 2002-03-27 | 2003-10-02 | Nof Corp | Olefin-based thermoplastic elastomer and its molding |
| CN104629180A (en) * | 2015-02-07 | 2015-05-20 | 浙江新恒泰新材料有限公司 | Polypropylene porous membrane and preparation method thereof |
| CN109280350A (en) * | 2018-08-09 | 2019-01-29 | 丹阳东润保鲜用品实业有限公司 | A kind of rapid shaping degradable composite material and preparation method thereof |
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| CN102391432B (en) * | 2011-09-07 | 2015-05-06 | 上海日之升新技术发展有限公司 | High-fluidity ethylene-alpha-octene graft copolymer and preparation method thereof |
| CN105622850B (en) * | 2016-03-30 | 2018-05-04 | 北京海科华昌新材料技术有限公司 | A kind of preparation method of the dual MCU system solid phase grafting PP of high-efficiency environment friendly |
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| CN104629180A (en) * | 2015-02-07 | 2015-05-20 | 浙江新恒泰新材料有限公司 | Polypropylene porous membrane and preparation method thereof |
| CN109280350A (en) * | 2018-08-09 | 2019-01-29 | 丹阳东润保鲜用品实业有限公司 | A kind of rapid shaping degradable composite material and preparation method thereof |
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