CN113174112A - Novel PVC injection-molded sole foaming agent - Google Patents

Novel PVC injection-molded sole foaming agent Download PDF

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CN113174112A
CN113174112A CN202010077217.8A CN202010077217A CN113174112A CN 113174112 A CN113174112 A CN 113174112A CN 202010077217 A CN202010077217 A CN 202010077217A CN 113174112 A CN113174112 A CN 113174112A
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parts
agent
pvc
foaming agent
foaming
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卢立娒
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    • C—CHEMISTRY; METALLURGY
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    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
    • C08J9/102—Azo-compounds
    • C08J9/103—Azodicarbonamide
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B13/00—Soles; Sole-and-heel integral units
    • A43B13/02—Soles; Sole-and-heel integral units characterised by the material
    • A43B13/04—Plastics, rubber or vulcanised fibre
    • C—CHEMISTRY; METALLURGY
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0066—Use of inorganic compounding ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/32—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof from compositions containing microballoons, e.g. syntactic foams
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/18—Binary blends of expanding agents
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    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/20—Ternary blends of expanding agents
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    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/22—Expandable microspheres, e.g. Expancel®
    • C—CHEMISTRY; METALLURGY
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    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C08J2327/06—Homopolymers or copolymers of vinyl chloride
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    • C08J2425/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
    • C08J2425/02—Homopolymers or copolymers of hydrocarbons
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Abstract

The invention relates to the field of PVC (polyvinyl chloride) materials, and discloses a PVC injection-molded sole novel foaming agent which comprises the following raw materials in parts by weight: 1000 parts of PVC, 6-25 parts of foaming agent, 5-10 parts of foaming homogenizing agent, 2-5 parts of foam-forming promoter, 3-5 parts of urea and 1-10 parts of expanding agent; according to the invention, due to the improvement of the formula, the materials are saved, the obtained sole is lighter and durable, and the consumption of the raw materials is further saved, so that the production cost is reduced, the net profit is increased, and the raw materials are more economic and environment-friendly; the formed sole has good cold resistance and thermal stability, can still keep higher mechanical property in a low-temperature environment, keeps good flexibility and large elasticity, and is comfortable to wear.

Description

Novel PVC injection-molded sole foaming agent
Technical Field
The invention relates to the field of PVC materials, in particular to a novel foaming agent for a PVC injection molded sole.
Background
PVC is one of five most used synthetic resins in the world and is a thermoplastic linear polymer generated by vinyl chloride monomer through free radical polymerization. The PVC material has the advantages of high strength, low price, good chemical corrosion resistance, good electrical insulation, difficult combustion and the like, and is widely used in engineering construction, food packaging, electrical and shoe making industries.
When the PVC is used for manufacturing soles, the PVC has higher mechanical strength, good acid and alkali resistance, dielectric property and insulating property. Compared with common rubber, it also has better wear resistance and flame retardant property. Therefore, the shoe is popular with multi-shoemaking enterprises.
However, the PVC sole in the prior art has the defect of heavy weight, and particularly has poor low-temperature brittleness and flexibility, so that the service life of the PVC sole is short. In addition, most of the existing factories for manufacturing the soles have low profit, the cost reduction and the better material performance are difficult to be combined, and the trend is not favorable for the subsequent development of the shoe manufacturing industry. There is a need for a lower cost, better performing shoe sole formulation.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a novel foaming agent for a pvc injection molded sole.
In order to solve the technical problem, the invention is solved by the following technical scheme:
the PVC material for the sole comprises the following raw materials in parts by weight: 1000 parts of PVC, 6-25 parts of foaming agent, 5-10 parts of foaming homogenizing agent, 2-5 parts of foam-forming promoter, 3-5 parts of urea and 1-10 parts of expanding agent. The novel foaming agent is a prepared one-time forming foaming agent, the foaming agent in the raw materials is an existing foaming agent, the foaming agent also needs to be matched with other auxiliary agents for assisting foaming, and can also be a foaming agent which can be directly purchased, the novel foaming agent simultaneously solves the problems of overweight and poor flexibility and cold resistance of a Pvc sole, and greatly reduces the production cost, urea is an expanding agent promoter, for example, 3kg of the expanding agent is added into 100kg of the PVC resin powder in the prior art, at present, 0.3-0.5kg of urea is added, the expanding agent only needs to be added into 0.1kg-1kg of the expanding agent according to the requirement on the softness degree of the sole, the original effect of 3kg of the expanding agent is achieved, wherein the price of the expanding agent is about 100 yuan/kg, the price of the urea is about 30 yuan/kg, and the production cost is greatly reduced. The foaming homogenizing agent and the urea can also reduce the foaming temperature, thereby achieving better forming effect and saving energy and cost.
Preferably, the PVC material for the sole comprises the following raw materials in parts by weight: 1-5 parts of lubricant, 1-5 parts of stabilizer, 0.056-0.56 part of heat stabilizer, 10-30 parts of impact modifier and 2.4-4 parts of surfactant.
Preferably, the impact modifier is a styrene thermoplastic elastomer or/and powdered nitrile rubber P83. For increasing the elasticity and mechanical properties of the resulting sole. The styrene thermoplastic elastomer can be selected from SBS, SEBS, SBCS and the like, has the rubber characteristic after being adopted, and has the characteristics of good elasticity and good flexibility after being formed.
Preferably, the foaming homogenizing agent is a polymer organic acid processing aid, and the apparent density of the foaming homogenizing agent is 0.3-0.6g/cm3Heating at 105 deg.C for 2 hr to volatilize less than 1.5%. The high molecular organic acid has good surface activity and polar hydroxyl outside, can improve the melt strength of the melt, prevent the combination of bubbles, promote the homogenization of the melt quality and promote the plasticization, and the foamed holes are more uniform and finer, thereby ensuring that the foamed product achieves stable processing performance and good mechanical property, and simultaneously solving the problem of poor processing fluidity under the melt strength.
Preferably, the lubricant comprises 2-6 parts of 2A type lubricant or 0.6-1.2 parts of polyethylene wax, 0.6-4 parts of erucamide or/and 0.6-1.4 parts of oleamide, and 2-6 parts of 3316 high-density oxidant in parts by weight. After the external lubricant is melted, a film is formed between the surfaces of the screw cylinder, the die, the screw rod and the like and the surface of the PVC melt, so that the surface glossiness of the product can be improved, the material plasticizing point can be adjusted, if the dosage is too high, the material plasticizing effect is influenced, and the uniformity of material mixing is also influenced, so that the produced product cannot obtain good physical and mechanical properties such as impact resistance. After being melted, the trihydroxyethyl isocyanurate is melted into the PVC melt, and the molecules in the melt are lubricated, so that the friction in the melted resin is reduced, and the phenomenon of coke in the melt in a screw cylinder is avoided. It not only reduces the viscosity of the melt and the die-stripping expansion, but also avoids the coke material and reduces the precipitation, and reduces the Vicat softening point. Wherein the liquid internal lubricant has a greater effect on the Vicat softening point and reduces melt fracture. The internal lubricant helps the material to be more uniform and better plasticized, improves the fluidity of the material flow, and can better reduce or eliminate the melt fracture phenomenon, especially under the condition of high-speed extrusion. The understanding and the clarity of the basic concepts and the performance characteristics of the internal lubricant and the external lubricant ensure the adjustment of the correct directionality of the formula design of the invention.
The polyethylene wax can be 119 wax or 6A basf A wax, has the characteristics of large molecular weight, better viscosity and improved dispersibility, and can make the injection molded sole softer.
The 2A type lubricant plays roles of increasing smoothness, smoothing, leveling, resisting adhesion and pollution in a melt, delaying sedimentation and agglomeration of pigment and filler, helping redispersion, and increasing wear resistance, scratch resistance and surface smoothness of the sole, and if the sole is colored or patterned, the sole can be clear in lines and bright in color; can also improve the ink diffusion performance and the adhesive capacity, and make the sole more beautiful.
Erucamide and oleamide are better in compatibility with resin, can form a monomolecular film on the surface of a substance, and increases the fluidity of the raw material by internal lubrication at the early stage of demoulding and external lubrication at the later stage. Has the advantages of anti-adhesion, pollution resistance, anti-precipitation, and improvement of foaming dispersibility and fluidity, so that the whole performance of the shoe body is better.
3316 can promote the stability of the molding and plasticizing stages, and has the effect of synthesizing internal and external stabilizers, so as to make the plasticized surface glossy and smooth.
Preferably, the foaming agent is a foaming agent mainly containing one or more of an ADC foaming agent and an AC foaming agent, and the expanding agent is a microsphere foaming agent. Of course, other white blowing agents, yellow blowing agents, AC-containing blowing agents or ADC-containing blowing agents containing seed particles or rare earth modifiers or other additional components can be used instead, said blowing agents being different from the blowing agent of the subject matter of the present invention, which is a novel blowing agent that is modified, does not require any further auxiliary agents, and can be directly foamed and molded.
Preferably, the heat stabilizer is zinc oxide or a mixture of zinc oxide and magnesium oxide; the stabilizer is trihydroxyethyl isocyanurate. The zinc oxide has better initial stabilization effect. But is unfavorable for long-term thermal stability; the effect of magnesium oxide is opposite; magnesium oxide and zinc oxide with different specifications have influence on thermal stability, magnesium oxide with different specifications mainly influences the initial hue of PVC, zinc oxide with different specifications has influence on both the initial hue and the long-term stability, zinc oxide can be used below 180 ℃, and a mixture of zinc oxide and magnesium oxide can be used for improving the thermal stability if the mixture is heated for a long time. The trihydroxyethyl isocyanurate is also named as mosaic, has an auxiliary stabilizing effect, has a plasticizing characteristic, enables the sole to have better flexibility, and has a certain whitening effect. Meanwhile, the zinc-rich alloy can prevent the phenomenon of zinc burning after the temperature is over 180 ℃.
Preferably, the surfactant is sodium dodecanesulphonate. The fluidity surface has higher melting point and good thermal stability, and when the temperature is increased, the nonionic surfactant is indispensable.
Preferably, the PVC material for the sole also comprises 1000 parts by weight of calcium powder and 800 parts by weight of dibutyl ester. Dibutyl ester is an additional plasticizer for assisting injection molding, and the injection molding effect can be improved. The calcium powder is light calcium carbonate or nano calcium carbonate, can play a role in filling, improves the strength of the formed sole, can be replaced by a modifier with a surface modification effect, and can also be matched with sodium bicarbonate, titanium dioxide, a calcium zinc stabilizer and the like.
Preferably, the weight ratio of the formulation is varied according to the desired thickness and properties of the sole. The thickness of the sole, the required softness and the specific requirement for light weight can be realized by changing the proportion of the foaming agent.
The injection molding machine can be a double-screw extruder or a single-screw extruder or other injection molding devices, wherein the temperature of the heel is 138-145 ℃, the temperature of the middle area of the sole is 160-165 ℃ and the temperature of the toe cap is 175-180 ℃. If the thickness of the sole is changed, the dosage of the foaming agent and the foaming agent auxiliary agent is changed, the forming temperature is also changed, and the forming effect can be better by further improving the manufacturing scheme and the process. When the foaming fails, the formula is added or adjusted, and the molding temperature is adjusted in a matching manner.
Due to the adoption of the technical scheme, the invention has the remarkable technical effects that:
the sole is obtained by foaming the ingredients, the preparation process is simple, and the prepared foamed sole has good wear resistance, long service life and light weight;
due to the improvement of the formula, the material is saved, the obtained sole is lighter and durable, and the consumption of the raw materials is further saved, so that the production cost is reduced, the net profit is increased, and the raw materials are more economic and environment-friendly;
through the cooperation of various components, the shoe sole has the advantages of good internal lubrication, external lubrication, thermal stability and foaming effect, so that the formed shoe sole has good cold resistance and thermal stability, can still keep higher mechanical property in a low-temperature environment, and has good flexibility, large elasticity and comfortable wearing.
Drawings
FIG. 1 is a cross-sectional view of a shoe sole in accordance with example 4 of the present invention.
FIG. 2 is a cross-sectional view of a comparative example 7 sole of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
The PVC material for the sole comprises the following raw materials in parts by weight: 1000 parts of PVC, 6-25 parts of foaming agent, 5-10 parts of foaming homogenizing agent, 2-5 parts of foam-forming promoter, 3-5 parts of urea and 1-10 parts of expanding agent. The PVC material for the sole comprises the following raw materials in parts by weight: 1-5 parts of lubricant, 1-5 parts of stabilizer, 0.056-0.56 part of heat stabilizer, 10-30 parts of impact modifier and 2.4-4 parts of surfactant.
The foaming homogenizing agent is a high molecular organic acid processing aid, and the apparent density of the foaming homogenizing agent is 0.3-0.6g/cm3Heating at 105 deg.C for 2 hr to volatilize less than 1.5%.
The lubricant comprises 2-6 parts of 2A type lubricant or 0.6-1.2 parts of polyethylene wax, 0.6-4 parts of erucamide or/and 0.6-1.4 parts of oleamide and 2-6 parts of 3316 high-density oxidant in parts by weight. The stabilizer is trihydroxyethyl isocyanurate.
The impact modifier is styrene thermoplastic elastomer or/and powdered nitrile rubber P83.
The foaming agent is a foaming agent which takes one or more of ADC foaming agent and AC foaming agent as main components, and the expanding agent is a microsphere foaming agent.
The heat stabilizer is zinc oxide or a mixture of zinc oxide and magnesium oxide.
The surfactant is sodium dodecanesulphonate.
The PVC material for the sole also comprises 1000 parts by weight of calcium powder 250-800 parts by weight of dibutyl ester 600-800 parts by weight of calcium powder.
Example 2
The novel PVC foaming agent for the PVC injection-molded sole is used for processing a thin sole, and comprises the following raw materials in parts by weight: 1000 parts of PVC, 6-25 parts of foaming agent, 5-10 parts of foaming homogenizing agent, 2-5 parts of foam-forming promoter, 3-5 parts of urea and 1-10 parts of expanding agent. In this example, 12 parts of foaming agent, 5 parts of foaming homogenizing agent, 2 parts of foam-forming promoter, 6 parts of urea and 2 parts of expanding agent are used.
The PVC material for the sole comprises the following raw materials in parts by weight: 1-5 parts of lubricant, 1-5 parts of stabilizer, 0.056-0.56 part of heat stabilizer, 10-30 parts of impact modifier and 2.4-4 parts of surfactant. In the embodiment, the heat stabilizer comprises 2 parts of stabilizer, 0.26 part of heat stabilizer, 20 parts of impact modifier and 2.4 parts of surfactant.
The foaming homogenizing agent is high molecular weightThe apparent density of the organic acid processing aid and the foaming homogenizing agent is 0.3-0.6g/cm3Heating at 105 deg.C for 2 hr to volatilize less than 1.5%.
The impact modifier is styrene thermoplastic elastomer or/and powdered nitrile rubber P83. The impact modifier in this example was powdered nitrile rubber P83.
The lubricant comprises 2-6 parts of 2A type lubricant or 0.6-1.2 parts of polyethylene wax, 0.6-4 parts of erucamide or/and 0.6-1.4 parts of oleamide and 2-6 parts of 3316 high-density oxidant in parts by weight. The stabilizer is trihydroxyethyl isocyanurate. In the embodiment, the lubricant comprises 2 to 6 parts of 2A type lubricant or 0.6 to 1.2 parts of polyethylene wax, 0.6 part of erucamide and 2 parts of 3316 high-density oxidant.
The foaming agent is a foaming agent which takes one or more of ADC foaming agent and AC foaming agent as main components, and the expanding agent is a microsphere foaming agent. The blowing agent in this example was an ADC blowing agent.
The heat stabilizer is zinc oxide or a mixture of zinc oxide and magnesium oxide. In this example, the thermal stabilizer is zinc oxide.
The surfactant is sodium dodecanesulphonate.
The PVC material for the sole also comprises 1000 parts by weight of calcium powder 250-800 parts by weight of dibutyl ester 600-800 parts by weight of calcium powder. In this embodiment, the PVC material for shoe sole further comprises 500 parts of calcium powder and 1000 parts of dibutyl ester.
Example 3
The novel PVC foaming agent for the PVC injection-molded sole is used for processing a thick sole, and comprises the following raw materials in parts by weight: 1000 parts of PVC, 6-25 parts of foaming agent, 5-10 parts of foaming homogenizing agent, 2-5 parts of foam-forming promoter, 3-5 parts of urea and 1-10 parts of expanding agent. In the embodiment, 50 parts of foaming agent, 10 parts of foaming homogenizing agent, 5 parts of foam-forming promoter, 10 parts of urea and 30 parts of expanding agent.
The PVC material for the sole comprises the following raw materials in parts by weight: 1-5 parts of lubricant, 1-5 parts of stabilizer, 0.056-0.56 part of heat stabilizer, 10-30 parts of impact modifier and 2.4-4 parts of surfactant. In this example, 10 parts of stabilizer, 0.6 part of heat stabilizer, 60 parts of impact modifier and 4 parts of surfactant are added.
The foaming homogenizing agent is a high molecular organic acid processing aid, and the apparent density of the foaming homogenizing agent is 0.3-0.6g/cm3Heating at 105 deg.C for 2 hr to volatilize less than 1.5%. The organic acid of the high molecular organic acid processing aid comprises organic acid and derivatives thereof, and the carbon skeleton is saturated or unsaturated and has mono-or di-carboxyl.
The impact modifier is styrene thermoplastic elastomer or/and powdered nitrile rubber P83. The impact modifier in this example was a mixture of a styrenic thermoplastic elastomer and powdered nitrile rubber P83.
The lubricant comprises 2-6 parts of 2A type lubricant or 0.6-1.2 parts of polyethylene wax, 0.6-4 parts of erucamide or/and 0.6-1.4 parts of oleamide and 2-6 parts of 3316 high-density oxidant in parts by weight. The lubricant in this example comprises 4 parts of 2A type lubricant, 4 parts erucamide, 1.4 parts oleamide, and 4 parts 3316 high density oxidizer.
The foaming agent is a foaming agent which takes one or more of ADC foaming agent and AC foaming agent as main components, and the expanding agent is a microsphere foaming agent. The blowing agent in this example was an AC blowing agent.
The heat stabilizer is zinc oxide or a mixture of zinc oxide and magnesium oxide; the stabilizer is trihydroxyethyl isocyanurate. In this example, the heat stabilizer is a mixture of zinc oxide and magnesium oxide.
The surfactant is sodium dodecanesulphonate.
The PVC material for the sole also comprises 1000 parts by weight of calcium powder 250-800 parts by weight of dibutyl ester 600-800 parts by weight of calcium powder. In this embodiment, the PVC material for shoe sole further comprises 1000 parts of calcium powder and 600 parts of dibutyl ester.
Example 4
The PVC material for the sole comprises the following raw materials in parts by weight: 1000 parts of PVC, 6-25 parts of foaming agent, 5-10 parts of foaming homogenizing agent, 2-5 parts of foam-forming promoter, 3-5 parts of urea and 1-10 parts of expanding agent. In the embodiment, 30 parts of foaming agent, 7.5 parts of foaming homogenizing agent, 3.5 parts of foam-forming promoter, 8 parts of urea and 16 parts of expanding agent.
The PVC material for the sole comprises the following raw materials in parts by weight: 1-5 parts of lubricant, 1-5 parts of stabilizer, 0.056-0.56 part of heat stabilizer, 10-30 parts of impact modifier and 2.4-4 parts of surfactant. In the embodiment, 6 parts of stabilizer, 0.4 part of heat stabilizer, 40 parts of impact modifier and 3.2 parts of surfactant
The foaming homogenizing agent is a high molecular organic acid processing aid, and the apparent density of the foaming homogenizing agent is 0.3-0.6g/cm3Heating at 105 deg.C for 2 hr to volatilize less than 1.5%.
The impact modifier is styrene thermoplastic elastomer or/and powdered nitrile rubber P83. The impact modifier in this example was a styrenic based thermoplastic elastomer.
The lubricant comprises 2-6 parts of 2A type lubricant or 0.6-1.2 parts of polyethylene wax, 0.6-4 parts of erucamide or/and 0.6-1.4 parts of oleamide and 2-6 parts of 3316 high-density oxidant in parts by weight. The stabilizer is trihydroxyethyl isocyanurate. In the embodiment, the lubricant is 4 parts of 2A type lubricant, 1.4 parts of oleamide and 6 parts of 3316 high-density oxidant.
The foaming agent is a foaming agent which takes one or more of ADC foaming agent and AC foaming agent as main components, and the expanding agent is a microsphere foaming agent. The blowing agent in this example was an AC blowing agent.
The heat stabilizer is zinc oxide or a mixture of zinc oxide and magnesium oxide. In this example, the thermal stabilizer is zinc oxide.
The surfactant is sodium dodecanesulphonate.
The PVC material for the sole also comprises 1000 parts by weight of calcium powder 250-800 parts by weight of dibutyl ester 600-800 parts by weight of calcium powder. In this embodiment, the PVC material for shoe sole further comprises 750 parts of calcium powder and 700 parts of dibutyl ester.
Example 5
The PVC material for the sole comprises the following raw materials in parts by weight: 1000kg of PVC1000kg, 15kg of foaming agent, 3.5kg of foaming homogenizing agent, 1.7kg of foam-forming promoter, 8kg of urea and 8kg of expanding agent.
The PVC material for the sole also comprises the following raw materials: 3kg of lubricant, 3kg of stabilizer, 0.2kg of heat stabilizer, 20kg of impact modifier and 1.6kg of surfactant.
The foaming homogenizing agent is a high molecular organic acid processing aid, and the apparent density of the foaming homogenizing agent is 0.3-0.6g/cm3Heating at 105 deg.C for 2 hr to volatilize less than 1.5%.
The impact modifier is styrene thermoplastic elastomer or/and powdered nitrile rubber P83.
The lubricant comprises 1.2kg of polyethylene wax, 1kg of erucamide and 0.5kg of oleamide in parts by weight, and 3316 kg of high-density oxidant in parts by weight.
The foaming agent is the combination of ADC foaming agent and AC foaming agent, and the expanding agent is microsphere foaming agent.
The heat stabilizer is a mixture of zinc oxide and magnesium oxide. The stabilizer is trihydroxyethyl isocyanurate.
The surfactant is sodium dodecanesulphonate.
The PVC material for the sole also comprises 650kg of calcium powder and 850kg of dibutyl ester.
Example 6
The PVC material for the sole comprises the following raw materials in parts by weight: 1000 parts of PVC, 6-25 parts of foaming agent, 5-10 parts of foaming homogenizing agent, 2-5 parts of foam-forming promoter, 3-5 parts of urea and 1-10 parts of expanding agent.
The foaming homogenizing agent is a high molecular organic acid processing aid.
Comparative example 7
Comparative example 7 is a PVC injection molded shoe sole novel foaming agent of the prior art, and the PVC material for shoe sole comprises the following raw materials in parts by weight: 1000 parts of PVC, 30 parts of foaming agent, 3.5 parts of foam-forming promoter and 16 parts of expanding agent.
The PVC material for the sole comprises the following raw materials in parts by weight: the lubricating agent, the stabilizer 6 parts, the heat stabilizer 0.4 part, the impact modifier 40 parts and the surface active agent 3.2 parts.
The impact modifier is a styrene thermoplastic elastomer.
The lubricant comprises 4 parts by weight of 2A type lubricant, 1.4 parts by weight of oleamide and 6 parts by weight of 3316 high-density oxidant.
The foaming agent is an AC foaming agent.
The heat stabilizer is zinc oxide. The stabilizer is trihydroxyethyl isocyanurate.
The surfactant is sodium dodecanesulphonate.
The PVC material for the sole also comprises 750 parts of calcium powder and 700 parts of dibutyl ester by weight.
Example 8
Comparing soles manufactured by the formulations of example 4 and example 7 respectively, with the same mold and the same pvc resin, the average price of the mixture of the pvc novel foaming agent of example 7 is 8 yuan/kg, the number of soles completed by the mixture of example 7 using the 400kg novel foaming agent in common is 800 duality, wherein 3.5kg foaming agent is added in the scheme of example 4, and 3kg foaming agent is additionally added when the foaming of example 7 using the same multi-foaming agent is unsuccessful. Neglecting the addition cost of the foaming agent, the total cost of the raw materials is 3200 yuan, the average cost of each pair of soles is 4 yuan, the cost price of the novel foaming agent in the embodiment 4 is higher than that of the embodiment, the total cost of 400kg is 3250 yuan, 1143 pairs of soles are obtained by co-foaming, the cost of each pair is about 2.85 yuan, and the saved cost is more than 1.15 yuan;
identical shoe molds, identical thickness, the soles of example 4 injection-molded shoe each weighed 81g, the soles of example 7 injection-molded shoe each weighed 116g, the weight of an average pair of shoes weighed 70% of example 7, wherein the association of the price of the foaming agent with its foaming effect was neglected due to the identical foaming agent used; the cross sections of the injection molded soles of the embodiment 4 and the embodiment 7 are respectively shown in figures 1-2, so that the soles of the invention are more compact, the materials are evenly foamed, the pores are small and even, and the soles of the prior art have the problems of poor foaming effect and larger bubbles.
The production capacity of one injection molding machine per day is 3000 pairs, the cost price of 1.15 yuan is saved on average per pair, and 125.9 ten thousand yuan is saved for one injection molding sole machine in 1 year. Neglecting that the sole material is better, more slim and graceful market profit that is welcomed to bring by the consumer in the market, the bigger the scale the quantity of mill injection molding machine is more, the cost of saving is also more, and the cost of saving, profit that actually bring are bigger than this calculated value.
In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.

Claims (10)

1. The novel PVC foaming agent for the PVC injection-molded sole is characterized by comprising the following raw materials in parts by weight: 1000 parts of PVC, 6-25 parts of foaming agent, 5-10 parts of foaming homogenizing agent, 2-5 parts of foam-forming promoter, 3-5 parts of urea and 1-10 parts of expanding agent.
2. The novel PVC foaming agent for injection-molded soles according to claim 1, characterized in that the PVC material for soles further comprises, in parts by weight: 1-5 parts of lubricant, 1-5 parts of stabilizer, 0.056-0.56 part of heat stabilizer, 10-30 parts of impact modifier and 2.4-4 parts of surfactant.
3. The novel blowing agent for pvc injection-molded shoe soles according to claim 2, characterized in that the impact modifier is a styrene-based thermoplastic elastomer or/and powdered nitrile rubber P83.
4. The novel foaming agent for pvc injection molded soles according to claim 1, characterized in that: the foaming homogenizing agent is a high molecular organic acid processing aid, and the apparent density of the foaming homogenizing agent is 0.3-0.6g/cm3Heating at 105 deg.C for 2 hr to volatilize less than 1.5%.
5. The novel blowing agent for pvc injection molded soles according to claim 2, characterized in that: the lubricant comprises 2-6 parts of 2A type lubricant or 0.6-1.2 parts of polyethylene wax, 0.6-4 parts of erucamide or/and 0.6-1.4 parts of oleamide and 2-6 parts of 3316 high-density oxidant in parts by weight.
6. The novel blowing agent for pvc injection molded soles according to claim 2, characterized in that: the foaming agent is a foaming agent which takes one or more of ADC foaming agent and AC foaming agent as main components, and the expanding agent is a microsphere foaming agent.
7. The novel blowing agent for pvc injection molded soles according to claim 2, characterized in that: the heat stabilizer is zinc oxide or a mixture of zinc oxide and magnesium oxide, and the stabilizer is trihydroxyethyl isocyanurate.
8. The novel blowing agent for pvc injection molded soles according to claim 2, characterized in that: the surfactant is sodium dodecanesulphonate.
9. The novel foaming agent for pvc injection molded soles according to claim 1, characterized in that: the PVC material for the sole also comprises 1000 parts by weight of calcium powder 250-800 parts by weight of dibutyl ester 600-800 parts by weight of calcium powder.
10. A novel blowing agent for pvc injection moulded soles according to any of claims 1-9, characterized in that the proportions by weight of the formulation are varied according to the desired thickness and properties of the sole.
CN202010077217.8A 2020-01-24 2020-01-24 Novel PVC injection-molded sole foaming agent Pending CN113174112A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102634131A (en) * 2012-04-11 2012-08-15 深圳市新纶科技股份有限公司 Low-density PVC (Poly Vinyl Chloride) injection-molded shoe material and preparation method thereof
CN109721772A (en) * 2018-12-30 2019-05-07 际华三五一五皮革皮鞋有限公司 Vibration-damping foamed rubber soles of a kind of hard height and preparation method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102634131A (en) * 2012-04-11 2012-08-15 深圳市新纶科技股份有限公司 Low-density PVC (Poly Vinyl Chloride) injection-molded shoe material and preparation method thereof
CN109721772A (en) * 2018-12-30 2019-05-07 际华三五一五皮革皮鞋有限公司 Vibration-damping foamed rubber soles of a kind of hard height and preparation method thereof

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