CN117209670A - Grafted polypropylene and preparation method thereof - Google Patents
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- CN117209670A CN117209670A CN202311358668.9A CN202311358668A CN117209670A CN 117209670 A CN117209670 A CN 117209670A CN 202311358668 A CN202311358668 A CN 202311358668A CN 117209670 A CN117209670 A CN 117209670A
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- -1 polypropylene Polymers 0.000 title claims abstract description 69
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 63
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 63
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000000178 monomer Substances 0.000 claims abstract description 47
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims description 21
- 238000001125 extrusion Methods 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 15
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 13
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 11
- 239000003999 initiator Substances 0.000 claims description 9
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 8
- 238000010792 warming Methods 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 5
- 239000003963 antioxidant agent Substances 0.000 claims description 5
- 230000003078 antioxidant effect Effects 0.000 claims description 5
- 239000002270 dispersing agent Substances 0.000 claims description 5
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 4
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 125000006165 cyclic alkyl group Chemical group 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 claims 1
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 11
- 230000002035 prolonged effect Effects 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 6
- 230000000630 rising effect Effects 0.000 description 6
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 5
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000006116 polymerization reaction Methods 0.000 description 5
- 125000005396 acrylic acid ester group Chemical group 0.000 description 4
- 230000000977 initiatory effect Effects 0.000 description 4
- 230000035484 reaction time Effects 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- PBOSTUDLECTMNL-UHFFFAOYSA-N lauryl acrylate Chemical compound CCCCCCCCCCCCOC(=O)C=C PBOSTUDLECTMNL-UHFFFAOYSA-N 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 125000005397 methacrylic acid ester group Chemical group 0.000 description 2
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- JHPBZFOKBAGZBL-UHFFFAOYSA-N (3-hydroxy-2,2,4-trimethylpentyl) 2-methylprop-2-enoate Chemical compound CC(C)C(O)C(C)(C)COC(=O)C(C)=C JHPBZFOKBAGZBL-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 229920001911 maleic anhydride grafted polypropylene Polymers 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 1
Abstract
The application relates to the field of polypropylene, in particular to grafted polypropylene and a preparation method thereof, wherein an acrylic monomer and polypropylene are grafted in a melting base mode, so that high grafting rate is realized, and the grafted polypropylene has good mechanical properties.
Description
Technical Field
The application relates to the field of polypropylene, in particular to grafted polypropylene and a preparation method thereof.
Background
Polypropylene (PP) is an important general plastic, is widely applied to the fields of films, braiding, pipes, injection molding and the like, and is one of the most widely applied and deeply studied plastic materials at present.
The modification of polypropylene is generally characterized in that the polypropylene is grafted by maleic anhydride, and melt grafting is a common extrusion mode, wherein polypropylene, an initiator and grafts are added into an extruder, free radicals are generated by the polypropylene at high temperature, and then the free radicals react with the grafts to complete the grafting step. The method has the advantages of simple process, capability of directly carrying out large-scale production on the existing equipment, high production efficiency and being an important application method in the current industry.
Melt extrusion currently has the following drawbacks that are difficult to overcome: because the extrusion temperature is too high and more free radicals are generated in the polypropylene, the polypropylene is partially degraded, further the further processing performance of the polypropylene is seriously affected, and if the lower temperature and less initiator are adopted to participate in the reaction, the grafting rate is difficult to exceed 1.5 percent, and the modification performance of the polypropylene is also adversely affected.
Disclosure of Invention
In order to improve the grafting rate and reduce the damage to the polypropylene structure in the melt grafting process, the application provides grafted polypropylene and a preparation method thereof.
Firstly, the application provides grafted polypropylene which is prepared by melt extrusion;
the grafted polypropylene extrusion raw material comprises the following components:
polypropylene;
the initiator is used in an amount of 0.05 to 0.3 percent of the mass of the polypropylene;
styrene in an amount of 1 to 5 percent of the mass of the polypropylene;
acrylic monomers, the dosage of which is 1 to 5 percent of the mass of polypropylene;
the dosage of the dispersing agent is 0-1% of the mass of the polypropylene;
the dosage of the antioxidant is 0 to 1 percent of the mass of the polypropylene.
In the system, the acrylic monomer is adopted to replace the maleic anhydride monomer, and under the action of the initiator, the acrylic monomer has weak self polymerization trend and strong tolerance to the initiator, so that the acrylic monomer is easy to react with polypropylene at multiple sites at a higher temperature, and a polypropylene material with high grafting rate can be obtained.
The polypropylene material has excellent performance, good compatibility, heat resistance, pressure resistance and mechanical property, and also has very high grafting rate, and the difficulty that the grafting rate of polypropylene is difficult to improve in the traditional scheme is overcome.
Preferably, the acrylic monomer structure is as shown in formula 1;
wherein R1 and R2 are both hydrogen or alkyl.
Further preferably, R1 is hydrogen or methyl, and R2 is a linear, branched or cyclic alkyl group of 6 to 12 carbon atoms. Wherein the acrylic monomer is a combination of acrylic acid or methacrylic acid and acrylic ester or methacrylic acid ester, wherein the acrylic acid or methacrylic acid accounts for 85-95% of the mass of the acrylic monomer.
Acrylic acid or methacrylic acid is selected as a main body, and a small amount of acrylic acid ester or methacrylic acid ester with a longer carbon chain is doped, so that good grafting rate can be maintained, and the mechanical property of the product is obviously improved. The acrylate structure with long chain can form a better winding cross-linking system in the system, so that the mechanical properties of plastics in all aspects are improved.
Through screening, the whole reaction performance of acrylic ester or methacrylic ester with the following structure and the strengthening performance of polypropylene are optimal:
wherein R1 is hydrogen or methyl.
In the above structures, all have a terminal branched structure, and have better performance in terms of molecular chain dynamics.
Preferably, the extrusion material further comprises acrylonitrile, the mass of which is not more than 0.2% of the mass of polypropylene.
A small amount of acrylonitrile can absorb a part of redundant free radicals, and damage to a polypropylene system caused by high temperature can be further reduced in the reaction. In addition, acrylonitrile is unfavorable for forming a too long molecular chain system on a main chain after participating in the reaction, and forms a form with higher grafting rate.
In the present application, a preparation method for preparing the above grafted polypropylene is also disclosed, which can be extruded by a twin screw extruder or other extrusion equipment, specifically, the extrusion temperature is set as follows:
the initial temperature is set to be 150-165 ℃, the temperature is gradually increased to be a constant temperature of 200-220 ℃ in an extruder and kept, and the temperature of an extrusion head is 213-225 ℃;
the extrusion time is 60-120 s.
Further preferably, the temperature raising process is set to a first temperature raising section and a second temperature raising section, a difference between a terminal temperature of the first temperature raising section and a constant temperature is not less than 15 ℃, and a time of the first temperature raising section is not less than half of a time of the constant temperature but not more than a time of maintaining the constant temperature. Further, the temperature of the second warming section is lower than the constant temperature, but higher than the end temperature of the first warming section; the second warming period is not longer than two thirds of the first warming period.
In the technical scheme, the first temperature rising section slowly rises to an intermediate temperature, and the second temperature rising section rapidly rises to a temperature required to be kept constantly, so that longer preheating time is provided for conveniently generating free radicals, meanwhile, the stage of high-temperature reaction is rapidly entered, and further, higher grafting rate is generated, meanwhile, the influence on polypropylene per se is smaller under the condition, and further, a polypropylene material with more excellent performance can be formed.
Preferably, the monomer used for grafting is introduced at the completion of the first temperature rising stage of not less than 50%.
In the scheme, the grafting monomer is not directly added into the system from the blanking position, but is added into the system in the preheating process after the system is preheated, so that the phenomenon of self-polymerization of the monomer is greatly reduced, and the grafting rate of the system is improved.
In summary, the application provides a grafted polypropylene structure, which replaces the existing maleic anhydride monomer with acrylic monomers to further improve the grafting rate, and simultaneously, by setting different grafting monomers, the proportion of the grafting monomers is adjusted to realize better performance adjustment and higher grafting rate.
Detailed Description
The scheme of the application is further illustrated by the following examples.
The application mainly provides an alternative scheme for replacing maleic anhydride grafted polypropylene, and particularly, the application forms higher grafting rate by using acrylic acid or acrylic acid ester compounds as grafting raw materials to replace maleic anhydride.
In consideration of the higher reaction temperature required by the acrylic acid monomer, in the application, the grafting temperature is higher than that of maleic anhydride, and meanwhile, the structural loss of polypropylene caused by high temperature in the extrusion process is reduced through process adjustment, so that the prepared grafted polypropylene has better performance.
In the present application, the detection of the grafted polypropylene is mainly carried out by the following experiments:
1. and (3) measuring the grafting rate: the grafting ratio can be determined by titration. Specifically, in the preparation process, firstly adding the product into dimethylbenzene, then adding excessive trifluoromethyl sulfonic acid into the system, heating to crack ester groups, and finally titrating with ethanol solution of potassium hydroxide by taking phenolphthalein as an indicator, wherein the whole calculation method can be referred to as the method in patent 202211362791.3.
2. Mechanical property measurement: the tensile strength and elongation at break of the product were determined with reference to national standards.
3. Measuring the processing performance: the melt flow rate of the product was determined with reference to national standards.
Firstly, the applicant carries out process adjustment on the input of acrylic acid, wherein acrylic acid monomers adopt two schemes of acrylic acid, methyl acrylate and lauryl acrylate, and the following examples can be obtained:
example 1, a grafted polypropylene, using the following raw materials:
the polypropylene comprises the following corresponding other raw materials in parts by mass as per 100 parts by mass:
1 part by mass of an initiator, namely DPC;
styrene, 2 parts by mass;
acrylic monomer: 3 parts by mass;
0.5 parts by mass of a dispersant, namely EBS;
and an antioxidant 1010,0.2 mass parts is selected.
The preparation method comprises the following steps:
polypropylene, styrene, antioxidant, dispersant and initiator were mixed in a high speed mixer and then fed into a twin screw extruder at the temperature set forth in table 1.
TABLE 1
It should be noted that in the above method, the whole body temperature and time can be appropriately adjusted, and the reaction time can be prolonged with a slower rotation speed at the same pitch. In the whole, the reaction time can be shortened by raising the temperature, the reaction time can be prolonged by lowering the temperature, for example, the whole temperature is lowered by 5-10 ℃, for example, the initial temperature is set to 150 ℃, the temperature of the extrusion head is set to 225 ℃, the time can be prolonged to about 120s by properly adjusting the temperature of each section, and in the same way, the time can be shortened to about 60s by properly raising the whole temperature by 5-10 ℃, for example, the initial temperature is set to 165 ℃, the temperature of the extrusion head is set to 225 ℃. It should be noted that the adjustment of the number of segments only affects the length of the whole twin-screw extruder, and the corresponding reaction time can be adjusted by adjusting the rotation speed.
In the above system, the amount of the initiator may be 0.05 to 0.3 part, the amount of the dispersant and the antioxidant may not exceed 1 part, and reasonable adjustment may be made within the range of change, and the effect thereof may be expected.
In example 2, the constant temperature interval was set to a constant temperature with different ends, and the time of the second temperature raising period was prolonged, so that the overall temperature raising process tended to four-stage uniform temperature raising, and specific parameters are shown in table 2.
TABLE 2
Example 3 the time of the first temperature rising period and the holding time of the constant temperature were made the same on the basis of example 1, the time of the second temperature rising period was kept unchanged, and the total construction time was appropriately prolonged, as shown in table 3.
TABLE 3 Table 3
In example 4, on the basis of example 1, the time of the first temperature raising period was prolonged and the time of the constant temperature region was correspondingly shortened, so that the time of the first temperature raising period was longer than the time of the constant temperature, and the total time was correspondingly adjusted, as shown in table 4.
TABLE 3 Table 3
Example 5, based on example 1, the difference between the first temperature raising section and the second temperature raising section was eliminated, the constant temperature was set to 210 ℃ and the time remained unchanged, and the original first temperature raising section and the second temperature raising section were changed to be entirely and uniformly heated, as shown in table 5.
TABLE 5
Example 6 on the basis of example 1, the end temperature of the first warming section was set to 195 ℃, the second warming section was set to 205 ℃, and the rest was unchanged, as shown in table 6.
TABLE 6
In example 7, the ratio of the time length of the first temperature raising period to the time length of the second temperature raising period was adjusted based on example 1, and the time of the second temperature raising period was prolonged to two thirds of the time of the first temperature raising period, as shown in table 7.
TABLE 7
In example 8, the ratio of the time length of the first temperature raising section to the time length of the second temperature raising section was adjusted based on example 1, and the time of the second temperature raising section was prolonged to be equal to the length of the first temperature raising section, as shown in table 8.
TABLE 8
In example 9, the time of the first temperature increasing period was shortened and the total time was slightly shortened in response to the prolonged time of the fixed temperature on the basis of example 1, as shown in table 9.
TABLE 9
The grafting ratios for the three grafting monomers for examples 1 to 9 are shown in Table 10.
Table 10, different examples three monomer grafting (%)
For the experimental results, it is not difficult to find that the process adjustment mainly has a larger influence on the grafting rate, specifically, taking example 1 as an example, three sections of a first heating section, a second heating section and a constant temperature section are respectively arranged in the heating process, a process of gradually heating and keeping the temperature for reaction is provided, and then the higher grafting rate is obtained. In example 2, the overall uniform temperature rise was employed, and the initiation was insufficient in the early stage and the reaction force was poor in the late stage, so that the graft ratio was the worst.
In example 4, the constant temperature time was too short, and the temperature rising process was too long, resulting in a slower reaction rate after initiation, which not only affected the grafting ratio, but also affected the self-chain structure of polypropylene. In embodiment 5, the process of combining the first temperature raising section and the second temperature raising section into a uniform temperature raising is not beneficial to setting of equipment, causes a large amount of heat to do idle work, and meanwhile, the phenomenon of incomplete initiation is easy to occur in the initiation stage. In example 8, too long a second heating period was set, which resulted in the self-polymerization of two molecules of the generated radicals, and also resulted in a decrease in the degree of polymerization.
Example 10, the grafting monomer addition position was adjusted based on example 1, and the grafting ratio was measured, as shown in Table 11.
TABLE 11
In the above table, the number of stages added indicates at which stage the addition was at the beginning, and it can be seen from the experimental data in example 10 that the monomer cannot be added to the reaction system too early, nor can it be added to the system again in the second elevated temperature stage. The grafting monomer is added in the second half of the first temperature raising stage to produce optimal grafting rate, and this may be because the grafting monomer has enough reaction sites to facilitate grafting onto polypropylene and reduce self-polymerization of the grafting monomer.
Example 11 the preparation of example 1 was chosen and different amounts of acrylonitrile were added with the grafting monomers during the process and the experimental parameters of the three different grafting monomers were determined and the results are shown in table 12.
Table 12
It should be noted that in the detection method of the present application, the acrylonitrile grafting is not detected, but since the amount of the acrylonitrile monomer added is small, the acrylonitrile grafting is ignored and the actual result is not significantly affected. From the above experimental data, it can be seen that the grafting ratio was changed in a tendency of increasing and then decreasing after the addition of the acrylonitrile monomer, and the tensile strength and elongation at break were similarly changed.
Based on example 11, the following examples were obtained by selecting an amount of 0.15 part of acrylonitrile to be added and substituting the grafting monomer. In the following examples, the grafting monomers used have the general formula shown in formula 1 and the different monomer numbers are shown in Table 13.
TABLE 13 list of grafting monomer formulas
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First, in order to verify that the mixed system of acrylic acid and acrylic acid ester has the specificity as compared with acrylic acid or acrylic acid ester alone (A1), methyl acrylate (B1) and lauryl acrylate (D4), the applicant selected four combinations of a1+d1, a1+e5, a1+g2 and a1' +e5 for experiments, and measured the properties of the prepared product parameters, and the results are shown in table 14.
TABLE 14
As is apparent from the above experimental data, in the solution of the present application, the combination of the two monomers has better performance than that of the single acrylic monomer or the acrylic monomer, and the total addition amount of the acrylic monomer generally does not exceed 15% of the total amount of the grafted monomers, otherwise, the two monomers are mixed and have no obvious difference from the effect exhibited by the two monomers alone, which may be caused by the fact that the grafting rate of the acrylic acid itself is adversely affected after the acrylic ester is grafted, or the fact that the winding structure around the polypropylene fiber is difficult to form due to the excessive content of the acrylic ester monomer.
For the protocol in Table 14, the first component was fixed at A1, the first component was fixed at 90% of the ratio, and a different second component was used, with the experimental results shown in Table 15.
TABLE 15
In the above experimental group, it can be seen that when E3, E3', E4', E5', F2, and F3 are used as the second monomer, the overall performance is better, and the branched structure at the end is possible to produce better mechanical performance and improving effect of processing performance on the system. In addition, two groups of M and N monomers are more expensive and therefore not preferred, although they are more effective in embodiments.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (10)
1. Grafted polypropylene, characterized in that it is prepared by melt extrusion;
the grafted polypropylene extrusion raw material comprises the following components:
polypropylene
The initiator is used in an amount of 0.05 to 0.3 percent of the mass of the polypropylene;
styrene in an amount of 1 to 5 percent of the mass of the polypropylene;
acrylic monomers, the dosage of which is 1 to 5 percent of the mass of polypropylene;
the dosage of the dispersing agent is 0-1% of the mass of the polypropylene;
the dosage of the antioxidant is 0 to 1 percent of the mass of the polypropylene.
2. The grafted polypropylene according to claim 1, wherein the acrylic monomer structure is represented by formula 1;
wherein R1 and R2 are both hydrogen or alkyl.
3. Grafted polypropylene according to claim 2, wherein R1 is hydrogen or methyl and R2 is a linear, branched or cyclic alkyl group of 6 to 12 carbons.
4. A grafted polypropylene according to claim 3, wherein the acrylic monomer is a combination of acrylic acid or methacrylic acid and an acrylate or methacrylate ester, wherein acrylic acid or methacrylic acid comprises 85 to 95% of the mass of the acrylic monomer.
5. The grafted polypropylene according to claim 4, wherein the acrylate or methacrylate is specifically selected from one of the following compounds:
wherein R1 is hydrogen or methyl.
6. The grafted polypropylene according to claim 1, wherein the extrusion raw material further comprises acrylonitrile, the mass of acrylonitrile not exceeding 0.2% of the mass of polypropylene.
7. The process for producing a grafted polypropylene according to any of claims 1 to 6, wherein the temperature of extrusion is set as follows:
the initial temperature is set to be 150-165 ℃, the temperature is gradually increased to a constant temperature of 200-220 ℃ in an extruder and kept, and the temperature of an extrusion head is 215-225 ℃;
the extrusion time is 60-120 s.
8. The method according to claim 7, wherein the temperature raising process is set to a first temperature raising stage and a second temperature raising stage, a difference between a terminal temperature of the first temperature raising stage and a constant temperature is not less than 15 ℃, and a time of the first temperature raising stage is not less than half a time of the constant temperature but not more than a time of maintaining the constant temperature.
9. The method of producing grafted polypropylene according to claim 8, wherein the temperature of the second elevated temperature section is lower than the constant temperature but higher than the end temperature of the first elevated temperature section; the second warming period is not longer than two thirds of the first warming period.
10. The method for producing grafted polypropylene according to claim 9, wherein the monomer for grafting is fed at the completion of the first temperature raising stage of not less than 50%.
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