CN115850609A - Auxiliary agent bag production line for PVC (polyvinyl chloride) hard product production and process thereof - Google Patents
Auxiliary agent bag production line for PVC (polyvinyl chloride) hard product production and process thereof Download PDFInfo
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Abstract
The application relates to the field of plastic auxiliaries, and particularly discloses an auxiliary package production line for production of PVC (polyvinyl chloride) hard products and a process thereof. An auxiliary agent bag production line for producing PVC hard products comprises a production process of processing modified particles; the production process of the processing modified particles comprises a latex particle preparation step and a processing modified particle preparation step, wherein the latex particles are polymerized by taking hydroxyl-terminated polybutadiene, styrene and fluorine-containing acrylate as raw materials; the processing modified particles are latex particles and vinyl chloride which are used as raw materials for polymerization. The processing property and mechanical property of the polyvinyl chloride can be obviously improved by adding the auxiliary agent bag formed by blending the processing modified particles and the additive into the polyvinyl chloride.
Description
Technical Field
The application relates to the technical field of plastic auxiliaries, in particular to an auxiliary package production line for producing PVC (polyvinyl chloride) hard products and a process thereof.
Background
The polyvinyl chloride (PVC) has excellent comprehensive performance, is one of five general plastics, and is widely applied to the fields of building material industry, light industry, agricultural and sideline industry and the like. PVC is generally prepared into various products by adopting injection molding and extrusion processes, but the decomposition temperature and the plasticizing temperature of the PVC are very close to each other due to the structural characteristics of the PVC, so that the PVC is easy to decompose in the processing process, hydrogen chloride is released, the color of the product is yellowed, and the performance is reduced.
In the related art, in order to reduce the processing difficulty of polyvinyl chloride, a plasticizer is selected to be added into the polyvinyl chloride. The plasticizer is mainly small molecular substance, such as dibutyl phthalate, dioctyl phthalate, etc. The compatibility of the micromolecular plasticizer and PVC is poor, the addition amount is difficult to control, and the addition amount of the plasticizer is in the anti-plasticizing concentration range, so that the performance of the product is easily reduced.
The plasticizer can also be selected from high molecular polymer polyacrylate copolymer. However, the composition of the polyacrylate copolymer is complex, and the different copolymerization compositions cause the performance of the polyacrylate copolymer to be remarkably different, so that the addition amount and the processing temperature of the polyacrylate copolymer have remarkable influence on the processing performance of PVC. When the addition amount of the polyacrylate copolymer is low, the improvement of the processing performance of PVC is limited; when the addition amount of the polyacrylate copolymer is too high, PVC melt is easy to break, and the quality of the product is reduced.
In view of the above situation, there is a need in the art to develop an additive capable of significantly improving the processability of PVC materials, so that the additive can significantly improve the processability of PVC materials and also improve the performance of PVC products.
Disclosure of Invention
The application provides an auxiliary agent bag production line for PVC hard product production and a process thereof, and the auxiliary agent can fully improve the processing performance of PVC materials.
In a first aspect, the application provides an auxiliary agent package production line for producing a PVC hard product, which adopts the following technical scheme:
an auxiliary agent bag production line for producing PVC hard products comprises a production process of processing modified particles;
wherein, the production process of processing modified particles comprises the following steps:
preparing latex particles: uniformly mixing water, a pH regulator I, an emulsifier, an initiator I, hydroxyl-terminated polybutadiene, styrene, fluorine-containing acrylate and a crosslinking agent, and polymerizing in an inert atmosphere to obtain latex particles; wherein, the weight ratio of hydroxyl-terminated polybutadiene to styrene to fluorine-containing acrylate is (12-28) to (25-37): (35-63);
preparation of processing modified particles: mixing the obtained latex particles, water, a pH regulator II, a dispersant II and an initiator II, vacuumizing in an inert atmosphere, and then adding a vinyl chloride monomer for polymerization to obtain processing modified particles; wherein the weight ratio of the chloroethylene monomer to the fluorine-containing acrylate is (26.8-34.2) to (35-63).
By adopting the technical scheme, the processing modification auxiliary agent leads hydroxyl-terminated polybutadiene, styrene and fluorine-containing acrylate to be polymerized to form latex particles through double bond addition reaction; and then, a polyvinyl chloride chain segment is grafted outside the latex particles through addition reaction, so that the processing and modifying additive is added into the polyvinyl chloride, and the processing performance and the mechanical performance of the polyvinyl chloride can be obviously improved. The principle is as follows:
the processing modified particles contain a large number of functional groups with stronger polarity, such as ester bonds, hydroxyl groups, fluorine, chlorine and the like, and can generate induced dipole moment interaction with polar chlorine elements in polyvinyl chloride, so that the acting force between the processing modified particles and polyvinyl chloride molecular chains is increased; in addition, the processed modified particles are granular and have numerous branched chains, so that the acting force among the polyvinyl chloride can be weakened, the movement of polyvinyl chloride molecular chains is promoted, and the melt viscosity of the polyvinyl chloride is kept in a proper range, thereby being beneficial to the low-temperature plasticization of the polyvinyl chloride; and secondly, the polyvinyl chloride chain segment contained in the processing modified particles ensures that the processing modified particles and the polyvinyl chloride have better compatibility, are easier to insert and distribute into the polyvinyl chloride, and can accelerate the melting plasticization of the polyvinyl chloride while achieving the obvious plasticization effect. In addition, the flexible alkyl chain segment and the rigid benzene ring chain segment contained in the processing modified particles can adjust the mechanical property of the polyvinyl chloride.
Moreover, the carbon-fluorine bond is introduced into the processing modified particles, and the breakage of the ester bond can be reduced by the strong shielding effect of the carbon-fluorine bond, so that the heat resistance of the processing modified particles is further effectively improved, the particles can not be easily broken and degraded at high temperature, and the long-acting processing performance is realized.
Meanwhile, as the processing modified particles contain active functional groups such as hydroxyl groups, and the like, in the processing process, the partially degraded polyvinyl chloride generates a multiolefin chain segment which can be connected to the processing modified additive, so that the whole polyvinyl chloride has better stability.
In conclusion, the specially-made processing modified particles can reduce the processing difficulty of the polyvinyl chloride and improve the processing performance of the polyvinyl chloride, so that the polyvinyl chloride can be melted and plasticized in a short time; and the processed product has excellent mechanical properties.
Preferably, the weight ratio of the hydroxyl-terminated polybutadiene to the styrene to the fluorine-containing acrylate is (20-24) to (30-32): (44 to 50).
Preferably, the weight ratio of the vinyl chloride monomer to the fluorine-containing acrylate is (30-32) to (44-50).
By adopting the technical scheme, the addition amounts of the hydroxyl-terminated polybutadiene, the styrene, the fluorine-containing acrylate and the vinyl chloride monomer are adjusted, so that the processability and the comprehensive use performance of the polyvinyl chloride can be further optimized under the same addition amount due to the adjustment of the chain segment structure.
Preferably, the polymerization temperature of the latex particles is 60 to 80 ℃ and the polymerization time is 30 to 60min.
Preferably, the polymerization temperature of the processing modified particles is 60-80 ℃, and the polymerization time is 30-45 min.
Preferably, the particle size of the processing-modified fine particles is 5 to 50 μm.
By adopting the technical scheme, the polymerization temperature and the polymerization time are optimized, on one hand, the possibility of occurrence of the implosion phenomenon can be reduced, and the production efficiency of processing modified particles is improved, on the other hand, the size of the processing modified particles can be controlled within a moderate range, so that the dispersion performance of the processing modified particles in polyvinyl chloride is further improved, the processing modified particles are added into the polyvinyl chloride, stress concentration points are not easily formed, and the impact resistance of the polyvinyl chloride is improved.
Preferably, the fluorine-containing acrylate is one or more of perfluoroalkyl ethyl methacrylate, 2- (perfluorobutyl) ethyl methacrylate and 3- (perfluoro-5-methyl hexyl) -2-hydroxypropyl methacrylate. More preferably, the fluoroacrylate is 3- (perfluoro-5-methylhexyl) -2-hydroxypropyl methacrylate.
By adopting the technical scheme, the fluorine-containing acrylate comprises but is not limited to 2- (perfluorododecyl) ethyl acrylate, 2- (perfluorobutyl) ethyl acrylate, perfluoroalkyl ethyl methacrylate and the like; compared with 2- (perfluorododecyl) ethyl acrylate, 2- (perfluorobutyl) ethyl acrylate, perfluoroalkylethyl methacrylate and 2- (perfluorobutyl) ethyl methacrylate, the fluorine chain length of 3- (perfluoro-5-methyl hexyl) -2-hydroxypropyl methacrylate is moderate, the influence on the grafting rate of hydroxyl polybutadiene and styrene at the opposite end is small, and the processing performance and the mechanical performance of the polyvinyl chloride are further improved.
Optionally, the additive package further comprises an additive, wherein the additive is zinc oxide.
By adopting the technical scheme, the additives comprise but are not limited to ultraviolet absorbent, heat stabilizer, lubricant and the like, and the ultraviolet absorbent is added into the polyvinyl chloride together with the processing modified particles, so that the yellowing resistance of the polyvinyl chloride product can be effectively improved, and the comprehensive use performance of the polyvinyl chloride is further improved. The zinc oxide can play a certain role in reflecting ultraviolet light and can better improve the yellowing resistance of the processing and modifying additive. Meanwhile, the surface of the zinc oxide contains active functional groups such as hydroxyl groups and the like, and the zinc oxide has good compatibility with processing modified particles through the action of polar bonds such as hydrogen bonds and the like, so that the zinc oxide has good dispersibility in polyvinyl chloride and can reduce stress concentration points in the polyvinyl chloride. In addition, the zinc oxide and the processing modified particles play a role in synergy in the aspect of improving the processing performance of the polyvinyl chloride.
Preferably, the weight ratio of the zinc oxide to the processing-modified fine particles is 1 (9 to 10).
By adopting the technical scheme, the addition amount of the zinc oxide is optimized, and the balance between the plasticizing performance and the mechanical performance of the polyvinyl chloride can be improved, so that the plasticizing performance and the mechanical performance of the polyvinyl chloride can be further improved.
In a second aspect, the application provides an auxiliary agent bag production process for producing a PVC hard product, which adopts the following technical scheme:
a production process of an auxiliary agent bag for producing PVC hard products comprises the following steps:
(1) Processing modified particles;
(2) Screening the particle size of the processed modified particles;
(3) Blending the process modified microparticles with an additive.
By adopting the technical scheme, the processing aid used in the polyvinyl chloride can obviously improve the processing performance and obtain excellent mechanical properties, particularly notch impact strength and excellent yellowing resistance.
In summary, the present application has at least the following beneficial effects:
according to the preparation method, the hydroxyl-terminated polybutadiene, the styrene and the fluorine-containing acrylate are crosslinked through double bonds to prepare the latex particles, and then the outer layer of the latex particles is coated with a layer of polyvinyl chloride, so that the processing modified particles have good compatibility when the polyvinyl chloride is processed and are fully dispersed in the polyvinyl chloride. The processing modified particles contain a large amount of functional groups with strong polarity, such as ester bonds, hydroxyl, fluorine, chlorine and the like, so that the particles can generate induced dipole moment interaction with polar chlorine elements in polyvinyl chloride, and the intermolecular acting force is weakened, so that the processing performance of the polyvinyl chloride is improved, and the polyvinyl chloride has good low-temperature plasticizing performance. Meanwhile, the flexible alkyl chain segment and the rigid benzene ring chain segment contained in the processing modified particles can adjust the mechanical property of the polyvinyl chloride, so that the polyvinyl chloride has better processing property and better mechanical property.
Detailed Description
In the related technology, the processing aid used for polyvinyl chloride is generally a small molecule plasticizer, but the compatibility between the small molecule plasticizer and polyvinyl chloride is poor, the addition amount is difficult to control, and the small molecule plasticizer exists in a reverse plasticizing concentration range, so that the processing aid cannot play a plasticizing role when added into polyvinyl chloride, and the mechanical property of polyvinyl chloride is reduced. When the addition amount of the high-molecular plasticizer polyacrylate is too high in the using process, the viscosity of the polyvinyl chloride is too high, and the melt fracture of the polyvinyl chloride is easily caused.
In view of the above circumstances, the present applicant has studied the structure and molecular chain segment of a processing aid for polyvinyl chloride, and found that: the fluorine-containing acrylate, hydroxyl-terminated polybutadiene and styrene are used as reaction raw materials, the obtained polymer contains a large number of ester bonds, hydroxyl, fluorine and other polar functional groups, and can generate induced dipole moment interaction with polar chlorine elements in polyvinyl chloride, so that the acting force between processed modified particles and polyvinyl chloride molecular chains is increased, the acting force between the polyvinyl chloride is reduced, and the low-temperature plasticization of the polyvinyl chloride is facilitated; the polyvinyl chloride chain segment is grafted on the polymer, and the obtained processing modified particles and the polyvinyl chloride have better compatibility, are easier to insert and distribute into the middle of the polyvinyl chloride, and can accelerate the melting plasticization of the polyvinyl chloride while achieving the obvious plasticization effect. In addition, the flexible alkyl chain segment and the rigid benzene ring chain segment contained in the processing modified particles can adjust the mechanical property of the polyvinyl chloride. Therefore, the technical problem of the application is successfully solved, and the novel polyvinyl chloride processing aid is provided, so that the mechanical property of polyvinyl chloride can be improved while the polyvinyl chloride has better processing property.
In addition, the processing modified particles and the ultraviolet absorbent in the additive are used together, so that the yellowing resistance of polyvinyl chloride products can be effectively improved, and the comprehensive use performance of polyvinyl chloride is further improved.
The present application will be described in further detail with reference to examples, comparative examples and application examples.
Unless otherwise specified, the raw materials used in the examples and comparative examples of the present application are as follows.
Hydroxyl-terminated polybutadiene:
type I: number average molecular weight of 3.8X 10 3 ～4.6×10 3 Hydroxyl value 0.48mmol/g;
type III: number average molecular weight of 3.0X 10 3 ～3.6×10 3 Hydroxyl value 0.70mmol/g;
and IV, type: number average molecular weight 2.7X 10 3 ～3.0×10 3 The hydroxyl value was 0.80mmol/g.
Emulsifier
The first emulsifier and the second emulsifier are selected from fatty alcohol-polyoxyethylene ether, sodium stearate and the like, and alkyl phenol polyoxyethylene ether ammonium sulfate CO436 is used as the first emulsifier and the second emulsifier in the application;
initiator
The choice of initiator one and initiator two includes, but is not limited to, potassium persulfate, ammonium persulfate, sodium bisulfite; in the application, the first initiator is formed by compounding potassium persulfate and sodium bisulfite according to the weight ratio of 1:1; in the application, the initiator II is formed by compounding sodium persulfate and sodium bisulfite according to the weight ratio of 1:1;
the selection of the crosslinking agent includes, but is not limited to, t-butyl hydroperoxide, which is selected herein;
pH regulator: the choice of the first pH regulator and the second pH regulator includes but is not limited to sodium dihydrogen phosphate and ammonium bicarbonate, and both the first pH regulator and the second pH regulator are ammonium bicarbonate in the present application.
Examples
Example 1
An auxiliary agent bag for producing PVC hard products is prepared by the following steps:
(1) Processing modified microparticle production
Preparing latex particles:
s1, sequentially adding 1kg of emulsifier I, 0.06kg of initiator I and 150kg of deionized water into a pre-emulsification kettle, and stirring for dissolving; adding polymerization raw materials into a pre-emulsification kettle, wherein the polymerization raw materials comprise 1.2kg of hydroxyl-terminated polybutadiene I type, 2.5kg of styrene and 6.3kg of 3- (perfluoro-5-methyl hexyl) -2-hydroxypropyl methacrylate; stirring and emulsifying for 20min to obtain a first pre-emulsion;
s2, filling nitrogen into a polymerization kettle for protection, sequentially adding 0.01kg of a first emulsifier, 2kg of deionized water, 0.003kg of a first pH regulator and 0.001kg of a crosslinking agent tert-butyl hydroperoxide into the polymerization kettle, starting stirring, and raising the temperature to 50 ℃;
s3, slowly dripping the pre-emulsion obtained in the step S1 into a polymerization kettle for 2-3 hours, heating to 55 ℃ after dripping is finished, carrying out heat preservation reaction for 3 hours, cooling to 40 ℃ and discharging to obtain latex particle emulsion;
s4, demulsifying, washing and drying the prepared copolymer emulsion to obtain powdery latex particles;
preparation of processing modified microparticles:
a1, sequentially adding 1kg of a second emulsifier, 0.06kg of a second initiator, 0.003kg of a second pH regulator and 150kg of deionized water into a pre-emulsification kettle, and stirring for dissolving;
adding the latex particles obtained in the step S4 into a pre-emulsification kettle, and stirring and emulsifying for 20min to obtain a pre-emulsion II;
a2, replacing air in the reaction kettle with nitrogen for three times, wherein the replacement pressure is-0.5 MPa, and adding 2.68kg of vinyl chloride monomer after replacement; improving the stirring speed, and controlling the stirring speed to be 500rpm/min;
and adding the pre-emulsion II into the reaction kettle from the top of the reaction kettle under pressure, heating to 55 ℃, carrying out heat preservation reaction for 3 hours, cooling and relieving pressure to terminate the reaction when the pressure in the kettle is reduced to 0.7MPa, discharging unreacted chloroethylene, filtering, washing and drying the discharged material to obtain the processed modified particles.
(2) Particle size screening of Process-modified microparticles
Processing the modified particles, screening, and selecting the particle size of 5-50 μm;
(3) Blending of process modified microparticles with additives
350g of processing modified particles with the particle size of 0.5-5 mu m are mixed with 25g of additive Basf1010 to prepare the additive package for producing the PVC hard product.
Examples 2 to 7
An auxiliary agent package for the production of PVC rigid products is different from the auxiliary agent package in the example 1 in the composition of the processing modified particles, which is specifically shown in the following table 1:
TABLE 1 composition of modified processed microparticles
| Composition/kg | Example 1 | Example 2 | Example 3 | Example 4 |
| Hydroxyl-terminated polybutadiene (type I) | 1.2 | 2 | 2.4 | 2.8 |
| Styrene (meth) acrylic acid ester | 2.5 | 3 | 3.2 | 3.7 |
| 3- (perfluoro-5-methylhexyl) -2-hydroxypropyl methacrylate | 6.3 | 5 | 4.4 | 6.3 |
| Vinyl chloride | 2.68 | 2.68 | 2.68 | 2.68 |
| Composition/kg | Example 5 | Example 6 | Example 7 | |
| Hydroxyl-terminated polybutadiene (type I) | 2 | 2 | 2 | |
| Styrene (meth) acrylic acid ester | 3 | 3 | 3 | |
| 3- (perfluoro-5-methylhexyl) -2-hydroxypropyl methacrylate | 5 | 5 | 5 | |
| Vinyl chloride | 3 | 3.2 | 3.5 |
Examples 8 to 10
An auxiliary agent package for producing PVC hard products is different from the auxiliary agent package in the embodiment 5 in that the processing parameters of the steps S4 and A2 are different, and the specific processing parameters are as follows:
in the step S4 in the embodiment 8, the temperature is raised to 60 ℃, and the reaction is carried out for 60min under the condition of heat preservation; in the step A2, heating to 60 ℃, and carrying out heat preservation reaction for 45min;
in the step S4 in the embodiment 9, the temperature is increased to 80 ℃, and the reaction is carried out for 30min under the condition of heat preservation; heating to 60 ℃ in the step A2, and carrying out heat preservation reaction for 30min;
in the step S4 in the embodiment 10, the temperature is raised to 85 ℃, and the reaction is carried out for 15min under the condition of heat preservation; and (3) heating to 85 ℃ in the step A2, and carrying out heat preservation reaction for 15min.
Example 11
An auxiliary agent package for producing PVC hard products is different from the auxiliary agent package in example 8 in the following point that the types of the fluorine-containing acrylate are different;
in example 11, 3- (perfluoro-5-methylhexyl) -2-hydroxypropyl methacrylate and the like were replaced by 2- (perfluorododecyl) ethyl acrylate by weight;
in example 12, 3- (perfluoro-5-methylhexyl) -2-hydroxypropyl methacrylate and the like were replaced by 2- (perfluorobutyl) ethyl acrylate by weight.
Examples 13 to 14
An auxiliary agent bag for producing PVC hard products is different from the auxiliary agent bag in the embodiment 8 in the types of hydroxyl-terminated polybutadiene, which is concretely as follows;
in example 13, hydroxyl-terminated polybutadiene type I was replaced by hydroxyl-terminated polybutadiene type III by an equal weight;
in example 14, hydroxy-terminated polybutadiene type I was replaced by hydroxy-terminated polybutadiene type IV by a constant weight.
Examples 15 to 16
An auxiliary agent package for producing PVC hard products is different from the auxiliary agent package in example 14 in the particle size of the processing modified particles, which is as follows:
the particle size of the modified fine particles in example 15 was 100 to 300. Mu.m;
the particle size of the modified fine particles in example 16 was 0.1 to 5 μm.
Example 17
An auxiliary agent package for producing PVC hard products is different from the auxiliary agent package in the embodiment 14 in that zinc oxide with the grain diameter of 0.1-0.5 mu m and the like are used for replacing Basf1010 in the embodiment.
Examples 18 to 20
An auxiliary agent package for producing PVC hard products is different from the auxiliary agent package in example 17 in that the weight of zinc oxide and the weight of processing modified particles are different, and the auxiliary agent package comprises the following components:
the dosage of the processing modified particles in the embodiment 18 is 450g, and the dosage of the zinc oxide is 50g;
the dosage of the processing modified particles in the embodiment 19 is 500g, and the dosage of the zinc oxide is 50g;
the amount of the modified fine particles used in example 20 was 650g and the amount of zinc oxide used was 100g.
Comparative example
Comparative examples 1 to 4
An auxiliary agent package for the production of PVC rigid articles, which differs from example 1 in the composition of the processing modified particles, is shown in table 2 below:
TABLE 2 composition of modified processing microparticles
| Composition/kg | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| Hydroxyl-terminated polybutadiene (type I) | 3.24 | / | 1.6 | 1.2 |
| Styrene (meth) acrylic acid ester | 6.76 | 2.84 | / | 2.5 |
| 3- (perfluoro-5-methylhexyl) -2-hydroxypropyl methacrylate | / | 7.16 | 8.4 | 6.3 |
| Vinyl chloride | 2.68 | 2.68 | 2.68 | / |
Performance test the additive packages for PVC rigid product production prepared in examples 1-20 and comparative examples 1-4 were added to PVC of SG-5 type in an amount of 5wt% based on SG-5 weight, and melt-blended and extruded to obtain test samples. Cutting a1 × 10cm long sample according to the standard, and carrying out the following detection:
the mechanical property is that a notch impact test sample strip is cut by a universal sampling machine according to the GB/T1843-2008 standard, and a cantilever beam impact tester is adopted to carry out an impact test (the test temperature is 23 ℃);
according to the requirements of GB/T1040-2006 standard, the drawing speed is 20mm/min (testing temperature: 23 ℃).
Yellowness index: taking a detection sample with the thickness of 1mm, testing on a chromatic aberration index instrument, selecting five different parts of each sample, taking the average value of five values and calculating the standard deviation of the five values. The irradiation dose of the test sample was 15kGy.
The processing performance is as follows: recording the plasticizing time of the detection sample;
scoring the surface finish of the test sample on a scale of 1-5;
the score was evaluated as follows:
and 5, stage: the surface of the PVC material is smooth and flat, and no pit is formed;
4, level: the surface of the PVC material is smooth, and pits are not obvious;
and 3, level: the surface of the PVC material is smooth, and pits are obvious;
and 2, stage: the surface of the PVC material is rough, and local pits are obvious;
level 1: the surface of the PVC material is extremely rough, and the whole pits are uneven.
The result of the detection
TABLE 4 data of the examination of the use effects of examples 1 to 20 and comparative examples 1 to 4
In the examples 1-20, the melting and plasticizing temperatures of the samples are 150-165 ℃ and the highest torque is 21.7-22.6 Nm; the melt plasticizing temperature of the comparative examples 1 to 4 is 176 to 185 ℃, and the maximum torque is 24.6 to 27.8 Nm; it can be shown that: the low temperature processability of polyvinyl chloride can be effectively improved by using the additive package.
Combining example 1 and comparative examples 1-4 and combining table 4, it can be seen that: the absence of fluoroacrylate in comparative example 1, the absence of hydroxyl-terminated polybutadiene in comparative example 2, the absence of styrene in comparative example 3, and the absence of polyvinyl chloride in comparative example 4, all of which had poor mechanical properties, long plasticizing time, and high plasticizing temperature, it can be seen that fluoroacrylate, hydroxyl-terminated polybutadiene, styrene, and vinyl chloride had a synergistic effect in improving the plasticizing properties and mechanical properties of polyvinyl chloride.
In combination with examples 14-16 and in combination with Table 4, it can be seen that: the particle size of the processing modified particles has an influence on the processability of polyvinyl chloride, because the particle size influences the distribution of the processing modified particles in polyvinyl chloride, thereby influencing the processability and mechanical properties of polyvinyl chloride.
In combination with examples 17 to 20 and in combination with Table 4, it can be seen that: the processing modified particles can obviously improve the processing performance and the mechanical performance of a polyvinyl chloride product within a certain doping amount range, and the reason for the processing modified particles is that the doping amount of the processing modified particles is increased within a certain range, the influence on the melt viscosity of the polyvinyl chloride is small, the melt fracture of the polyvinyl chloride is not easy to cause, and the processing performance of the polyvinyl chloride is excellent.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. An auxiliary agent bag production line for producing PVC hard products is characterized by comprising a production process of processing modified particles;
wherein, the production process of processing modified particles comprises the following steps:
preparing latex particles: uniformly mixing water, a pH regulator I, an emulsifier, an initiator I, hydroxyl-terminated polybutadiene, styrene, fluorine-containing acrylate and a crosslinking agent, and polymerizing in an inert atmosphere to obtain latex particles; wherein, the weight ratio of hydroxyl-terminated polybutadiene, styrene and fluorine-containing acrylate is (12-28) to (25-37): (35 to 63);
preparation of processing modified particles: mixing the obtained latex particles, water, a pH regulator II, a dispersant II and an initiator II, vacuumizing in an inert atmosphere, and adding a vinyl chloride monomer for polymerization to obtain processing modified particles; wherein the weight ratio of the chloroethylene monomer to the fluorine-containing acrylate is (26.8-34.2) to (35-63).
2. The auxiliary agent bag production line for the production of PVC rigid articles according to claim 1, characterized in that: the weight ratio of the hydroxyl-terminated polybutadiene, the styrene and the fluorine-containing acrylate is (20-24) to (30-32): (44 to 50).
3. The additive package production line for the production of PVC rigid articles according to claim 2, characterized in that: the weight ratio of the vinyl chloride monomer to the fluorine-containing acrylate is (30-32) to (44-50).
4. The additive package production line for the production of PVC rigid articles according to claim 1, characterized in that: the polymerization temperature of the latex particles is 60-80 ℃, and the polymerization time is 30-60 min.
5. The auxiliary agent bag production line for PVC hard product production according to claim 4, characterized in that: the polymerization temperature of the processing modified particles is 60-80 ℃, and the polymerization time is 30-45 min.
6. The additive package production line for the production of PVC rigid articles according to claim 1, characterized in that: the particle size of the processing modified particles is 0.5-5 mu m.
7. The additive package production line for the production of PVC rigid articles according to claim 6, characterized in that: the fluorine-containing acrylate is one or more of perfluoroalkyl ethyl methacrylate, 2- (perfluorobutyl) ethyl methacrylate and 3- (perfluoro-5-methyl hexyl) -2-hydroxypropyl methacrylate.
8. The additive package production line for the production of PVC rigid articles according to claim 1, characterized in that: the additive package also comprises an additive, wherein the additive is zinc oxide.
9. The additive package production line for the production of PVC rigid articles according to claim 8, characterized in that: the weight ratio of the zinc oxide to the processing modified particles is 1 (9-10).
10. The production process of the auxiliary agent bag for producing the PVC hard product is characterized by comprising the following steps:
(1) Processing modified particles;
(2) Screening the particle size of the processed modified particles;
(3) Blending the processing-modified particles with additives.
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