CN117757129A - PVC foaming regulator and preparation method thereof - Google Patents

Abstract

The invention is applicable to the technical field of PVC foaming regulator production, and provides a PVC foaming regulator and a preparation method thereof. The regulator is formed by dehydration and drying of a polymeric emulsion. The polymeric emulsion is composed of acrylate compounds, methacrylic acid It is prepared by mixing ester compounds, pH regulators, initiators, etc. The preparation method includes: adding the polymerization liquid A in the reaction kettle A and the polymerization liquid B in the reaction kettle B into the reaction kettle D to prepare the main polymerization mixed liquid, adding the main polymerization mixed liquid into the emulsifier solution in the reaction kettle C, and then adding Cross-linking agent, wetting agent, plasticizer and antistatic agent are used to prepare polymer emulsion, and the filtered polymer emulsion is dried by spray drying equipment. The present invention uses the copolymerization of multiple compounds to prepare the PVC foaming regulator, and the intrinsic viscosity of the obtained copolymer is higher than that of the copolymer obtained by the single-initiation system.

Description

A kind of PVC foaming regulator and preparation method thereof

Technical field

The invention is applicable to the technical field of PVC foaming regulator production and provides a PVC foaming regulator and a preparation method thereof.

Background technique

PVC foaming regulator is a special processing aid, mainly used to increase the pressure and torque of PVC melt, increase the cohesion and homogeneity of PVC melt, and obtain denser PVC products. PVC foaming regulator is based on acrylic esters and has all the basic characteristics of PVC processing aids. The molecular weight is also much higher than that of general-purpose processing aids. In PVC foam products, adding ultra-high molecular weight polymer PVC foam regulator can promote the plasticization of PVC, increase the melt strength of PVC foam materials, prevent the merging of bubbles, and obtain uniformly foamed products.

Viscosity is one of the important indicators for evaluating the performance of PVC foaming regulators. PVC foaming regulators with higher viscosity can effectively adjust the foaming speed and cell structure to obtain ideal PVC foaming products. There is a certain relationship between the viscosity of PVC foaming regulator and torque. Generally speaking, the higher the viscosity of PVC foaming regulator, the greater the torque it brings. The torque reflects the enhancing effect of the regulator on the PVC melt. The higher the torque, the better the enhancing effect of the regulator on the PVC melt. It can improve the cohesion and homogeneity of the PVC melt and make the resulting PVC products denser. . The viscosity of existing PVC foaming regulators is generally between 10 and 11ml/g, and the torque is between 15 and 18N/m. In order to better adapt to the market, the viscosity of PVC foaming regulators needs to be further improved.

Contents of the invention

In view of the defects pointed out in the background art, the object of the present invention is to provide a PVC foaming regulator and a preparation method thereof.

In order to achieve the above object, the present invention provides a PVC foaming regulator. The PVC foaming regulator is made from a polymerized emulsion through dehydration and drying. According to the percentage of a certain substance in the total weight of the polymerized emulsion, the polymerized emulsion includes The following components:

Methacrylate compound 30~36wt%, acrylate compound 20~24wt%, initiator 0.34~0.46wt%, stabilizer 1.4~2.6wt%, emulsifier 1.25~1.45wt%, deionized water 33~42.5 wt%, polymerization inhibitor 0.16~0.2wt%, antistatic agent 0.5~0.63wt%, plasticizer 0.5~0.63wt%, PH regulator 0.45~0.56wt%, cross-linking agent 1~1.26wt%, wetting agent 0.5～0.63wt%;

The methacrylate compound is any one of methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, butyl methacrylate, isobutyl methacrylate, and octyl methacrylate. species or species;

The acrylate compound is any one or more of methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, and hydroxyethyl acrylate;

The initiator is any one or more of benzoyl peroxide, dicyclohexyl peroxydicarbonate, and azobisisobutyronitrile;

The antistatic agent is any one of calcium chloride, sodium lauryl sulfate, and polyethylene glycol;

The plasticizer is any one of dioctyl phthalate, polycaprolactone, and dioctyl adipate;

The cross-linking agent is any one of trimethylolpropane, methylhexahydrophthalic anhydride, vinyltrimethoxysilane, and diphenylmethane diisocyanate;

The wetting agent is any one or more of ethyl acetate, propanol, and butanone.

Preferably, the total amount of the methacrylate compound and the acrylate compound is 50-60wt%, and the ratio between the methacrylate compound and the acrylate compound is 3:2 or 7:3. .

Preferably, the stabilizer is any one or more of calcium stearate and phenyl salicylate.

Preferably, the emulsifier is any one or more of alkylphenol polyoxyethylene ether and polyvinyl alcohol.

Preferably, the polymerization inhibitor is any one of hydroquinone, p-hydroxyanisole, and sodium thiosulfate.

Preferably, the pH adjuster is any one of sodium bicarbonate, ammonia water, and sodium hydroxide.

The invention also provides a method for preparing a PVC foaming regulator, which specifically includes the following steps:

step one:

Prepare four reaction kettles with different capacities, marked as reaction kettles A, B, C, and D respectively. After cleaning these four reaction kettles, introduce a sufficient amount of protective atmosphere to expel the air in the four reaction kettles;

Step 2:

Add 0.13 to 0.25wt% preheated initiator to reactor A. After preheating, all the methacrylate compounds are added to reactor A. Mix and stir in a certain temperature environment for 15 to 45 minutes. The stirring speed is 100 to 300r. /min, obtain polymerization liquid A;

Add 0.07 to 0.18wt% preheated initiator into reactor B. After preheating, all the acrylate compounds are added to reactor B. Mix and stir in a certain temperature environment for 15 to 45 minutes. The stirring speed is 100 to 300r/min. , obtain polymerization liquid B;

Add deionized water to reactor C, heat reactor C with a stirring speed of 100-300r/min. When the temperature reaches 78-80°C, add all emulsifiers and stabilizers, keep the temperature constant, and mix and stir After 15-20 minutes, the emulsifier solution is obtained;

Step three:

Add polymerization liquid A and polymerization liquid B into reaction kettle D. The stirring speed is 300-500r/min. Raise the temperature to 65-85°C. Add the remaining initiator and mix for 30-45 minutes before adding all the polymerization inhibitors. , mix again for 20 to 30 minutes to obtain the main polymer mixture;

Step four:

Slowly add the main polymer mixture into the emulsifier solution in reactor C according to a certain flow rate. After the addition of the main polymer mixture is completed, add cross-linking agent, wetting agent, plasticizer, and antistatic agent in sequence. All additives are added. Finally, adjust the temperature of reactor C to 65-75°C, keep the temperature for 1.5-2 hours, then add a pH adjuster to adjust the pH value of the polymer emulsion to 7.0-7.2;

Step five:

The polymerized emulsion with adjusted pH value is filtered out solid impurities through a filter. The filtered polymerized emulsion is dried by spray drying equipment. During the process, the polymerized emulsion is first atomized into tiny droplets and then dried into powder particles. The powder particles After being collected by the collector, it is sent to a drying box for further drying and dehydration. The thoroughly dried powder particles are further processed, such as screening, mixing or packaging, to meet specific application requirements.

Preferably, in the step 4, when reactor C is insulated, the stirrer is operated intermittently, and the stirring speed is 100-300 r/min with a time interval of 10-15 min for 1-5 min.

After adopting the above technical solution, the beneficial effects of the present invention are:

1. The present invention uses copolymerization of methacrylic acid ester compounds and acrylic acid ester compounds to prepare PVC foaming regulator. The intrinsic viscosity of the resulting copolymer is higher than that of the copolymer obtained by the single-initiation system. The plasticizer and cross-linking agent have Combined use can improve the foaming efficiency and cell quality, increase the melt strength of the material, make the foam cells uniform and dense, thereby increasing the viscosity and torque of the PVC melt, effectively increasing the cohesion and homogeneity of the PVC melt. Make the resulting PVC products denser;

2. Various monomers in methacrylate compounds and acrylate compounds have different performance characteristics and are prepolymerized separately. Each monomer can be polymerized under optimal conditions and can be better controlled. The polymerization rate and molecular structure of each monomer can be obtained to obtain a prepolymer with a uniform structure and stable quality. After these prepolymers are mixed and then polymerized, an emulsion with better performance and uniform particle size distribution can be obtained, which improves the product quality. quality.

Description of the drawings

In order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to describe the embodiments or the prior art will be briefly introduced below.

Figure 1 is a schematic diagram comparing product characteristics of various embodiments of the present invention;

Figure 2 is a rheological torque data diagram of Example 1;

Figure 3 is a rheological torque data diagram of Example 4;

Figure 4 is a graph of rheological torque data of Example 5.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the invention will be described in further detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are configured only to explain the invention and not to limit the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention.

The embodiment provides a PVC foaming regulator. The PVC foaming regulator is made of an acrylic ester polymeric emulsion through dehydration and drying. According to the percentage of a certain substance in the total weight of the polymeric emulsion, the components of the polymeric emulsion are as follows: methyl Acrylate compound 30~36wt%, acrylate compound 20~24wt%, initiator 0.34~0.46wt%, stabilizer 1.4~2.6wt%, emulsifier 1.25~1.45wt%, deionized water 33~42.5wt% , polymerization inhibitor 0.16~0.2wt%, antistatic agent 0.5~0.63wt%, plasticizer 0.5~0.63wt%, PH regulator 0.45~0.56wt%, cross-linking agent 1~1.26wt%, wetting agent 0.5~ 0.63wt%.

The total amount of methacrylate compounds and acrylate compounds is 50-60wt%, and the ratio between methacrylate compounds and acrylate compounds is 3:2 or 7:3. Among them, the methacrylate compound is any one of methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, butyl methacrylate, isobutyl methacrylate, and octyl methacrylate. One or more, the acrylate compound is any one or more of methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, and hydroxyethyl acrylate.

The antistatic agent is any one of calcium chloride, sodium lauryl sulfate, and polyethylene glycol, and the plasticizer is any one of dioctyl phthalate, polycaprolactone, and dioctyl adipate. Any one, the wetting agent is any one or more of ethyl acetate, propanol, and methyl ethyl ketone, and the cross-linking agent is trimethylolpropane, methylhexahydrophthalic anhydride, vinyltrimethoxysilane, diphenyl Any one of the methylmethane diisocyanates. Among them, the ratio between antistatic agent, wetting agent, cross-linking agent and plasticizer is 1:1:2:1.

The stabilizer is any one or more of calcium stearate and phenyl salicylate, and the initiator is any one of benzoyl peroxide, dicyclohexyl peroxydicarbonate, and azobisisobutyronitrile. Kind or variety. The emulsifier is any one or more of alkylphenol polyoxyethylene ether and polyvinyl alcohol. The polymerization inhibitor is any one of hydroquinone, p-hydroxyanisole, and sodium thiosulfate. The pH adjuster is any one of sodium bicarbonate, ammonia, and sodium hydroxide.

The invention also provides a method for preparing a PVC foaming regulator, which specifically includes the following steps:

step one:

Prepare four reaction kettles with different capacities, marked as reaction kettles A, B, C, and D respectively. After cleaning these four reaction kettles, introduce a sufficient amount of protective atmosphere (such as nitrogen or inert gas) and crowd out the four reaction kettles. The air in the reactor;

Step 2:

Add 0.13~0.25wt% preheated initiator (preheating temperature: 65~90℃) into reaction kettle A, preheat the methacrylate compound (preheating temperature: 50~60℃) and then add all of them to the reaction In kettle A, mix and stir for 15 to 45 minutes at a temperature of 65 to 85°C at a stirring speed of 100 to 300 r/min to obtain polymerization liquid A;

Add 0.07~0.18wt% preheated initiator (preheating temperature: 65~90°C) into reactor B, preheat the acrylate compound (preheating temperature: 50~60°C) and then add all of it to reactor B , mix and stir for 15 to 45 minutes in a temperature environment of 65 to 85°C, with a stirring speed of 100 to 300 r/min, to obtain polymerization liquid B;

Add deionized water to reactor C, heat reactor C with a stirring speed of 100-300r/min. When the temperature reaches 78-80°C, add all emulsifiers and stabilizers, keep the temperature constant, and mix and stir After 15-20 minutes, the emulsifier solution is obtained;

Step three:

Add polymerization liquid A and polymerization liquid B into reaction kettle D. The stirring speed is 300-500r/min. Raise the temperature to 65-85°C. Add the remaining initiator and mix for 30-45 minutes before adding all the polymerization inhibitors. , mix again for 20 to 30 minutes to obtain the main polymer mixture;

Step four:

Slowly add the main polymer mixture into the emulsifier solution in reactor C, and control the dripping time at 2 to 3 hours. After the main polymer mixture is finished dripping, add the cross-linking agent, wetting agent, plasticizer, and antistatic agent in sequence. , after all the additives are added, adjust the temperature of reactor C to 65-75°C and keep it warm. When reactor C is kept warm, the stirrer runs intermittently, stirring for 1-5 minutes at intervals of 10-15 minutes, and the speed is 100-300r/min, keep the temperature for 1.5-2 hours, then add a pH adjuster to adjust the pH value of the polymer emulsion to 7.0-7.2;

Step five:

The polymerized emulsion with adjusted pH value is filtered out solid impurities through a filter. The filtered polymerized emulsion is dried by spray drying equipment. During the process, the polymerized emulsion is first atomized into tiny droplets and then dried into powder particles. The powder particles After being collected by the collector, it is sent to a drying box for further drying and dehydration. The thoroughly dried powder particles undergo further processing, such as screening, mixing or packaging, to meet specific application requirements.

Example 1

Preparing PVC foaming regulator A001 includes the following steps:

step one:

Prepare four reaction kettles with different capacities, marked as reaction kettles A, B, C, and D respectively. After cleaning these four reaction kettles, add enough nitrogen as a protective atmosphere to expel the air in the four reaction kettles. ;

Step 2:

Add 0.18wt% preheated (preheating temperature: 65-90°C) azobisisobutyronitrile as the initiator into reactor A, and take 36wt% methyl methacrylate for preheating (preheating temperature: 50~60℃), add all of them to reactor A after preheating, mix and stir for 15~45min at a temperature of 75~85℃, with a stirring speed of 100~300r/min, to obtain polymerization liquid A;

Add 0.12%wt% preheated (preheating temperature: 65-90°C) benzoyl peroxide as the initiator into reactor B, and take 24wt% isobutyl acrylate for preheating (preheating temperature: 50°C) ~60°C), add all of them to reactor B after preheating, mix and stir for 15-45 minutes at a temperature of 75-85°C, with a stirring speed of 100-300r/min, to obtain polymerization liquid B;

Add 33wt% deionized water to reactor C, heat reactor C with a stirring speed of 100-300r/min. When the temperature reaches 78-80°C, add 1.25wt% alkylphenol polyoxyethylene ether , 0.65wt% calcium stearate and 0.75wt% phenyl salicylate, keep the temperature constant, mix and stir for 15 to 20 minutes to obtain an emulsifier solution;

Step three:

Add polymerization liquid A and polymerization liquid B into reaction kettle D, stir at a speed of 300 to 500r/min, raise the temperature to 65 to 85°C, add 0.16wt% benzoyl peroxide as an initiator, and mix and stir for 30 to After 45 minutes, add 0.18wt% hydroquinone as a polymerization inhibitor, mix and stir again for 20 to 30 minutes, and obtain the main polymerization mixture;

Step four:

Slowly add the main polymer mixture into the emulsifier solution in reactor C according to a certain flow rate, and control the dropping time at 2 to 3 hours. After all the main polymer mixture has been dropped, add 1.26wt% trimethylol in sequence. After propane, 0.63wt% ethyl acetate, 0.63wt% dioctyl phthalate, 0.63wt% sodium lauryl sulfate, and all the additives are added, adjust the temperature of the reactor C to 65~ 75°C, insulate. When reactor C is insulated, the stirrer operates intermittently, stir for 1 to 5 minutes at intervals of 10 to 15 minutes, and the rotation speed is 100 to 300 r/min. After 1.5 to 2 hours of insulation, add 0.56wt% hydrogen carbonate. Sodium adjusts the pH value of the polymer emulsion to 7.0 to 7.2;

Step five:

The polymerized emulsion with adjusted pH value is filtered out solid impurities through a filter. The filtered polymerized emulsion is dried by spray drying equipment. During the process, the polymerized emulsion is first atomized into tiny droplets and then dried into powder particles. The powder particles After being collected by the collector, it is sent to a drying box for further drying and dehydration. The thoroughly dried powder particles undergo further processing, such as screening, mixing or packaging, to meet specific application requirements. The rheological torque data chart is shown in Figure 2.

Example 2

Preparing PVC foaming regulator A002 includes the following steps:

step one:

Prepare four reaction kettles with different capacities, marked as reaction kettles A, B, C, and D respectively. After cleaning these four reaction kettles, add enough nitrogen as a protective atmosphere to expel the air in the four reaction kettles. ;

Step 2:

Add 0.16wt% preheated (preheating temperature: 65-90°C) azobisisobutyronitrile as the initiator into reactor A, and take 33wt% methyl methacrylate for preheating (preheating temperature: 65-90°C) 50~60℃), add all of them to reactor A after preheating, mix and stir for 15~45min at a temperature of 75~85℃, with a stirring speed of 100~300r/min, to obtain polymerization liquid A;

Add 0.1%wt% preheated (preheating temperature: 65-90°C) benzoyl peroxide as the initiator into reactor B, and take 22wt% isobutyl acrylate for preheating (preheating temperature: 50°C) ~60°C), add all of them to reactor B after preheating, mix and stir for 15-45 minutes at a temperature of 75-85°C, with a stirring speed of 100-300r/min, to obtain polymerization liquid B;

Add 38wt% deionized water to reactor C, heat reactor C with a stirring speed of 100-300r/min. When the temperature reaches 78-80°C, add 1.36wt% alkylphenol polyoxyethylene ether , 0.6wt% calcium stearate and 0.94wt% phenyl salicylate, keep the temperature unchanged, mix and stir for 15 to 20 minutes to obtain an emulsifier solution;

Step three:

Add polymerization liquid A and polymerization liquid B into reaction kettle D. The stirring speed is 300~500r/min. Raise the temperature to 65~85℃. Add 0.14wt% benzoyl peroxide as the initiator and mix and stir for 30~ After 45 minutes, add 0.2wt% hydroquinone as a polymerization inhibitor, mix and stir again for 20 to 30 minutes, and obtain the main polymerization mixture;

Step four:

Slowly add the main polymer mixture into the emulsifier solution in reactor C according to a certain flow rate, and control the dropping time at 2 to 3 hours. After all the main polymer mixture has been dropped, add 1.2wt% trimethylol in sequence. After propane, 0.6wt% ethyl acetate, 0.6wt% dioctyl phthalate, 0.6wt% sodium lauryl sulfate, and all the additives are added, adjust the temperature of the reactor C to 65~ 75°C, insulate. When reactor C is insulated, the stirrer operates intermittently. Stir for 1 to 5 minutes at intervals of 10 to 15 minutes. The rotation speed is 100 to 300 r/min. After insulating for 1.5 to 2 hours, add 0.5wt% hydrogen carbonate. Sodium adjusts the pH value of the polymer emulsion to 7.0 to 7.2;

Step five:

The polymerized emulsion with adjusted pH value is filtered out solid impurities through a filter. The filtered polymerized emulsion is dried by spray drying equipment. During the process, the polymerized emulsion is first atomized into tiny droplets and then dried into powder particles. The powder particles After being collected by the collector, it is sent to a drying box for further drying and dehydration. The thoroughly dried powder particles undergo further processing, such as screening, mixing or packaging, to meet specific application requirements.

Example 3

Preparing PVC foaming regulator A003 includes the following steps:

step one:

Prepare four reaction kettles with different capacities, marked as reaction kettles A, B, C, and D respectively. After cleaning these four reaction kettles, add enough nitrogen as a protective atmosphere to expel the air in the four reaction kettles. ;

Step 2:

Add 0.12wt% preheated (preheating temperature: 65-90°C) azobisisobutyronitrile as the initiator into reactor A, and take 30wt% methyl methacrylate for preheating (preheating temperature: 50~60℃), add all of them to reactor A after preheating, mix and stir for 15~45min at a temperature of 75~85℃, with a stirring speed of 100~300r/min, to obtain polymerization liquid A;

Add 0.1wt% preheated (preheating temperature: 65-90°C) benzoyl peroxide as the initiator into reactor B, and take 20wt% isobutyl acrylate for preheating (preheating temperature: 50-90°C) 60°C), add all of them to reactor B after preheating, mix and stir for 15 to 45 minutes at a temperature of 75 to 85°C, with a stirring speed of 100 to 300r/min, to obtain polymerization liquid B;

Add 42.5wt% deionized water to reactor C, heat reactor C with a stirring speed of 100-300r/min. When the temperature reaches 78-80°C, add 1.45wt% alkylphenol polyoxyethylene Ether and 2.6wt% phenyl salicylate, keep the temperature constant, mix and stir for 15 to 20 minutes to obtain an emulsifier solution;

Step three:

Add polymerization liquid A and polymerization liquid B into reaction kettle D. The stirring speed is 300~500r/min. Raise the temperature to 65~85℃. Add 0.12wt% benzoyl peroxide as the initiator and mix and stir for 30~ After 45 minutes, add 0.16wt% hydroquinone as a polymerization inhibitor, mix and stir again for 20 to 30 minutes, and obtain the main polymerization mixture;

Step four:

Slowly add the main polymer mixture into the emulsifier solution in reactor C according to a certain flow rate, and control the dripping time at 2 to 3 hours. After all the main polymer mixture is dropped, add 1wt% trimethylolpropane in sequence. , 0.5wt% ethyl acetate, 0.5wt% dioctyl phthalate, 0.5wt% sodium lauryl sulfate, after all the additives are added, adjust the temperature of the reaction kettle C to 65~75 °C, keep warm. When reactor C is kept warm, the stirrer runs intermittently, stir for 1 to 5 minutes at intervals of 10 to 15 minutes, and the rotation speed is 100-300 r/min. After keeping warm for 1.5 to 2 hours, add 0.45wt% sodium bicarbonate. Adjust the pH value of the polymeric emulsion to 7.0~7.2;

Step five:

The polymerized emulsion with adjusted pH value is filtered out solid impurities through a filter. The filtered polymerized emulsion is dried by spray drying equipment. During the process, the polymerized emulsion is first atomized into tiny droplets and then dried into powder particles. The powder particles After being collected by the collector, it is sent to a drying box for further drying and dehydration. The thoroughly dried powder particles undergo further processing, such as screening, mixing or packaging, to meet specific application requirements.

Example 4

Preparation of PVC foaming regulator B001:

The added amount of methyl methacrylate was changed from 36wt% to 24wt%, and the similar compound isobutyl methacrylate was added. The added amount of isobutyl methacrylate was 12wt%, and the added amount of isobutyl acrylate was changed from 24wt%. Change it to 16wt%, add the same compound ethyl acrylate, the added amount of ethyl acrylate is 8wt%, and the rest is the same as in Example 1. The rheological torque data chart is shown in Figure 3.

Example 5

Preparation of PVC foaming regulator B002:

The added amount of methyl methacrylate was changed from 24wt% to 28wt%, the added amount of isobutyl methacrylate was changed from 12wt% to 14wt%, the added amount of isobutyl acrylate was changed from 16wt% to 12wt%, and the added amount of acrylic acid The addition amount of ethyl ester was changed from 8wt% to 6wt%, and the rest was the same as in Example 4. The rheological torque data chart is shown in Figure 4.

In the formula used in the A series PVC foaming regulator, methacrylate compounds and acrylate compounds are both single-use types, and the ratio between methacrylate compounds and acrylate compounds is 3:2. In the formula used for B series PVC foaming regulator, methacrylate compounds and acrylate compounds are both mixed types. The ratio between methacrylate compounds and acrylate compounds in type B001 is 3:2. . Methyl methacrylate and isobutyl methacrylate are selected as methacrylate compounds, and the ratio between the two is 2:1. Isobutyl acrylate and ethyl acrylate are selected as the acrylate compounds. The ratio between the two is 2:1. The ratio between the methacrylate compound and the acrylate compound in the B002 type is 7:3. Same as B002 type.

According to the above embodiments, the influence of feeding type on product performance is obtained. See Figure 1 for details. The viscosity of existing PVC foaming regulators is generally between 10 and 11 ml/g, and the torque is between 15 and 18 N/m. The viscosity of the B002 type of the present invention is higher than that of existing products, which can greatly improve the elasticity of PVC melt and strengthen the PVC melt. The elongation and strength are beneficial to covering the bubbles and preventing them from collapsing.

According to the above embodiments of the present invention, these embodiments do not exhaustively describe all the details, nor do they limit the invention to only specific embodiments. Obviously, many modifications and variations are possible in light of the above description. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and make modifications based on the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (8)

1. A PVC foaming regulator, characterized in that the PVC foaming regulator is made from a polymerized emulsion through dehydration and drying. According to the percentage of a certain substance in the total weight of the polymerized emulsion, the polymerized emulsion includes the following components : Methacrylate compound 30~36wt%, acrylate compound 20~24wt%, initiator 0.34~0.46wt%, stabilizer 1.4~2.6wt%, emulsifier 1.25~1.45wt%, deionized water 33~42.5 wt%, polymerization inhibitor 0.16~0.2wt%, antistatic agent 0.5~0.63wt%, plasticizer 0.5~0.63wt%, PH regulator 0.45~0.56wt%, cross-linking agent 1~1.26wt%, wetting agent 0.5～0.63wt%; The methacrylate compound is any one of methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, butyl methacrylate, isobutyl methacrylate, and octyl methacrylate. species or species; The acrylate compound is any one or more of methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, and hydroxyethyl acrylate; The initiator is any one or more of benzoyl peroxide, dicyclohexyl peroxydicarbonate, and azobisisobutyronitrile; The antistatic agent is any one of calcium chloride, sodium lauryl sulfate, and polyethylene glycol; The plasticizer is any one of dioctyl phthalate, polycaprolactone, and dioctyl adipate; The cross-linking agent is any one of trimethylolpropane, methylhexahydrophthalic anhydride, vinyltrimethoxysilane, and diphenylmethane diisocyanate; The wetting agent is any one or more of ethyl acetate, propanol, and butanone. 2. The PVC foaming regulator according to claim 1, characterized in that: the total amount of the methacrylate compound and the acrylate compound is 50-60wt%, and the methacrylate compound and The ratio between acrylic compounds is 3:2 or 7:3. 3. The PVC foaming regulator according to claim 1, characterized in that the stabilizer is any one or more of calcium stearate and phenyl salicylate. 4. The PVC foaming regulator according to claim 1, characterized in that the emulsifier is any one or more of alkylphenol polyoxyethylene ether and polyvinyl alcohol. 5. The PVC foaming regulator according to claim 1, characterized in that: the polymerization inhibitor is any one of hydroquinone, p-hydroxyanisole, and sodium thiosulfate. 6. The PVC foaming regulator according to claim 1, characterized in that: the pH regulator is any one of sodium bicarbonate, ammonia water, and sodium hydroxide. 7. A method for preparing a PVC foaming regulator based on the PVC foaming regulator of any one of claims 1 to 6, characterized in that it includes the following steps step one: Prepare four reaction kettles with different capacities, marked as reaction kettles A, B, C, and D respectively. After cleaning these four reaction kettles, introduce a sufficient amount of protective atmosphere to expel the air in the four reaction kettles; Step 2: Add 0.13~0.25wt% of the preheated initiator into the reaction kettle A. After preheating, all the methacrylate compounds are added to the reaction kettle A. After heating, mix and stir for 15~45min. The stirring speed is 100~300r/min. , obtain polymerization liquid A; Add 0.07 to 0.18wt% of the preheated initiator into the reaction kettle B. After preheating, all the acrylate compounds are added to the reaction kettle B. After heating, mix and stir for 15 to 45 minutes at a stirring speed of 100 to 300r/min to obtain Polymer solution B; Add deionized water to reactor C, heat reactor C with a stirring speed of 100-300r/min. When the temperature reaches 78-80°C, add all emulsifiers and stabilizers, keep the temperature constant, and mix and stir After 15-20 minutes, the emulsifier solution is obtained; Step three: Add polymerization liquid A and polymerization liquid B into reaction kettle D. The stirring speed is 300-500r/min. Raise the temperature to 65-85°C. Add the remaining initiator and mix for 30-45 minutes before adding all the polymerization inhibitors. , mix again for 20 to 30 minutes to obtain the main polymer mixture; Step four: Slowly add the main polymer mixture into the emulsifier solution in reaction kettle C. After the main polymer mixture is added dropwise, add the cross-linking agent, wetting agent, plasticizer, and antistatic agent in sequence. After all additions are completed, move the reaction kettle Adjust the temperature of C to 65~75°C, keep it for 1.5~2 hours and then add a pH adjuster to adjust the pH value of the polymer emulsion to 7.0~7.2; Step five: The polymerized emulsion with adjusted pH value is filtered out solid impurities through a filter. The filtered polymerized emulsion is dried by spray drying equipment. During the process, the polymerized emulsion is first atomized into tiny droplets and then dried into powder particles. The powder particles It is collected through the collector and sent to the drying box for further drying and dehydration. 8. The preparation method of PVC foaming regulator according to claim 7, characterized in that: in the step four, when the reaction kettle C is insulated, the stirrer is operated intermittently, with a rotation speed of 100-300r/min. Stir for 1 to 5 minutes at intervals of ~15 minutes.