CN109810236B - Method for manufacturing polyurethane sole and polyurethane raw material used for method - Google Patents
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Abstract
The invention relates to a method for manufacturing a polyurethane sole. The method comprises the following steps: a: cleaning a closable die, preheating the die to 50-80 ℃, and closing the die; b: vacuumizing the inner cavity of the mold to-0.1 Mpa, and keeping the inner cavity of the mold in a set vacuum state; c: pouring a mixture of the defoamed CPU polyurethane prepolymer and a curing agent into a mold cavity, and keeping the temperature of the mold at 50-80 ℃ after curing; d: after curing, opening the mold, taking out the formed polyurethane sole, standing for 6-8 hours at normal temperature until the physical property can meet the requirement, and trimming to obtain the finished product of the polyurethane sole of the final product. The sole manufactured by the method has the advantages of simple process conditions, low production temperature, high production efficiency and no volatile substances in the production process. The insole and the outsole of the sole are integrally formed, glue is not needed to be used for bonding between the outsole and the insole, the combination is firm, the sole is not easy to deform after shaping, and the service life of the sole is long. The polyurethane raw material is catalyzed by organic amine, the polyurethane sole product is environment-friendly and nontoxic, and the performance can meet the conventional physical property requirement of the sole.
Description
Technical Field
The invention relates to a method for manufacturing a polyurethane sole, a polyurethane raw material for the manufacturing method and preparation of the polyurethane raw material.
Background
The sole is rather complex in construction and in a broad sense may include all of the materials forming the sole, such as the outsole, midsole and heel. In a narrow sense, only the outsole is referred to, and the common characteristics of the general sole materials should have the characteristics of wear resistance, water resistance, oil resistance, heat resistance, pressure resistance, impact resistance, good elasticity, easy adaptation to the foot shape, difficult deformation after shaping, heat preservation, easy moisture absorption and the like, and simultaneously should be matched with the midsole to have the brake function of preventing slipping and easy stopping when the foot is changed during walking. The sole materials are of various types and can be divided into natural base materials and synthetic base materials. The natural bottom materials comprise natural bottom leather, bamboo, wood and the like, and the synthetic bottom materials comprise rubber, plastics, rubber and plastic combined materials, regenerated leather, elastic hardboard and the like.
The prior art for manufacturing the outsole generally comprises two processes of vulcanization and injection molding. The vulcanization process is generally that the rubber and other thermosetting materials are vulcanized to prepare the rubber, a plane vulcanizing machine is utilized, high temperature and high pressure are adopted, volatile substances are discharged in the vulcanization process, the cured rubber cannot be naturally degraded and can become garbage, workers are invaded by toxic and harmful substances, and occupational diseases of the shoe-making workers are easily caused due to improper sanitary protection; the injection molding process generally adopts thermoplastic materials such as TPR and the like to carry out injection molding through an injection molding machine, the thermoplastic materials can be repeatedly used, but the plastic cannot be degraded and can become garbage, volatile substances are also discharged at high temperature and high pressure in the injection molding process, and the temperature of a mold needs to be rapidly switched between high temperature and low temperature in the injection molding process, so that more energy sources need to be consumed. The two processes are both subjected to high temperature and high pressure, volatile substances are discharged in the production process at high temperature, the production process is not environment-friendly, and the prepared product cannot be degraded and is not environment-friendly.
With the continuous development of the technology, a technology for manufacturing soles by adopting a pouring process is also provided, a polyurethane sole stock solution is used for pouring, the pouring technology adopts an open type mould for pouring and forming the soles, the mould is filled by utilizing the weight of the polyurethane sole stock solution fluid, the mould is closed and pressed and formed when polyurethane starts to solidify, only soles with simpler shapes can be manufactured, a self-leveling surface can be generated certainly, soles with complicated shapes or three-dimensional shapes cannot be manufactured at all, the curing temperature of the polyurethane sole stock solution is required to be 80-100 ℃, and the production efficiency is lower. The simple shape, low efficiency and high curing temperature lead the technology of the cast sole to be limited greatly.
And the outsole and the insole are bonded by glue, one is that the glue bonding needs more labor, the other is filled with a solvent, although the existing water-based glue appears, the water-based glue is greatly limited, and the solvent-based glue is also used in large quantities. The bottom combining efficiency by using the glue is low, the environment is not protected, and the bonding strength of the glue is not high. Due to the limitation of the shape and the pattern, the insole and the outsole can only be combined simply, and the slightly complex shape can not be combined, thereby forming great restriction on the design.
Disclosure of Invention
The invention aims to provide a manufacturing method of a polyurethane sole, a polyurethane raw material for the manufacturing method and preparation of the polyurethane raw material. The sole manufactured by the method has the advantages of simple process conditions, low production temperature, high production efficiency and no volatile substances in the production process. The insole and the outsole of the sole are integrally formed, glue is not needed to be used for bonding between the outsole and the insole, the combination is firm, the sole is not easy to deform after shaping, and the service life of the sole is long. The polyurethane raw material is catalyzed by organic amine, the polyurethane sole product is environment-friendly and nontoxic, and the performance can meet the conventional physical property requirement of the sole.
The invention discloses a manufacturing method of a polyurethane sole, a polyurethane raw material for the manufacturing method and a preparation method of the polyurethane raw material, wherein the manufacturing method comprises the following steps:
a: cleaning a closable die, preheating the die to 50-80 ℃, and closing the die;
b: vacuumizing the inner cavity of the mold to-0.1 Mpa, and keeping the air pressure of the inner cavity of the mold in a set vacuum state;
c: pouring a mixture of the defoamed CPU polyurethane prepolymer and a curing agent into a mold cavity, and keeping the temperature of the mold at 50-80 ℃ after curing;
d: after curing, opening the mold, taking out the formed polyurethane sole, standing for 6-8 hours at normal temperature until the physical property can meet the requirement, and trimming to obtain the final polyurethane sole finished product.
The manufacturing method of the polyurethane sole comprises the following steps:
a: cleaning a closable die, and preheating the die to 50-80 ℃;
b: placing the middle sole in a mold cavity, preheating the middle sole to 50-80 ℃ in advance, and closing the mold;
c: vacuumizing the inner cavity of the mold to-0.1 MPa; and keeping the air pressure of the inner cavity of the mold in a set vacuum state;
d: pouring a mixture of the defoamed CPU polyurethane prepolymer and a curing agent into a mold cavity, and keeping the temperature of the mold at 50-80 ℃ after curing;
e: after curing, opening the mold, taking out the molded combined polyurethane sole, standing for 6-8 hours at normal temperature until the physical property can meet the requirement, and trimming to obtain the final combined polyurethane sole finished product.
The manufacturing method of the polyurethane sole comprises the following steps:
a: cleaning a closable die, and preheating the die to 50-80 ℃;
b: placing the sole accessory to be coated in the mold cavity, preheating the accessory to 50-80 ℃ in advance, and closing the mold;
c: vacuumizing the inner cavity of the mold to-0.1 MPa; and keeping the air pressure of the inner cavity of the mold in a set vacuum state;
d: pouring a mixture of the defoamed CPU polyurethane prepolymer and a curing agent into a mold cavity, and keeping the temperature of the mold at 50-80 ℃ after curing;
e: and after curing, opening the mold, taking out the molded polyurethane coated sole accessory, standing for 6-8 hours at normal temperature until the physical property can meet the requirement, and trimming to obtain the final finished product of the polyurethane coated sole accessory.
The CPU type polyurethane raw material for manufacturing the polyurethane sole is prepared by uniformly mixing the CPU type polyurethane prepolymer and the curing agent in a mass ratio of 100: 40-120 at the temperature of 50-60 ℃; under the condition that the temperature of the die is kept between 50 and 80 ℃, the mixture of the CPU type polyurethane prepolymer and the curing agent reacts in the die cavity for 10 to 30 minutes for curing and forming, the physical property of the formed polyurethane sole can meet the requirement after being placed for 6 to 8 hours at normal temperature, and the final polyurethane sole finished product is obtained.
According to the CPU type polyurethane raw material for manufacturing the polyurethane sole, 100 parts by mass of polyether polyol or polyester polyol is stirred and heated to 120 ℃ of 100 plus materials, the temperature is kept for 2 hours in vacuum, then the temperature is reduced to 60-80 ℃, 60-140 parts by mass of chain extender is added, the stirring and heating are continued to 85-95 ℃, the vacuum temperature is kept for 4 hours, the sampling and measuring are carried out, the-NCO content reaches a preset value of 9-21%, the stirring and cooling are continued to 50-60 ℃, and the vacuum temperature is kept for 4 hours, so that the CPU type polyurethane prepolymer is obtained; the chain extender is diphenylmethane diisocyanate.
The polyether polyol is polyoxypropylene diol or polytetramethylene ether diol;
the polyester polyol is polyethylene glycol diglycol adipate dihydric alcohol or polypropylene glycol adipate dihydric alcohol;
the CPU polyurethane raw material for manufacturing the polyurethane sole is prepared by stirring and heating 100-200 parts by mass of polyether polyol or 200-300 parts by mass of polyester polyol and a chain extender to 120 ℃ under vacuum heat preservation for 2 hours, cooling to 60-80 ℃, adding 0.5-3.5 parts by mass of triethylene diamine, stirring, and vacuum heat preservation for 4 hours to obtain the curing agent; the chain extender is 10-30 parts by mass of 1, 4-butanediol.
The polyether polyol is polyoxypropylene diol or polytetramethylene ether diol;
the polyester polyol is polyethylene glycol diglycol adipate dihydric alcohol or polypropylene glycol adipate dihydric alcohol;
the CPU polyurethane raw material for manufacturing the polyurethane sole is prepared by stirring and heating 100-200 parts by mass of polyether polyol or 200-300 parts by mass of polyester polyol and a chain extender to 120 ℃ under vacuum heat preservation for 2 hours, cooling to 60-80 ℃, adding 0.5-3.5 parts by mass of triethylene diamine, stirring, and vacuum heat preservation for 4 hours to obtain the curing agent; the chain extender is 10-40 parts by mass of diethylene glycol.
The polyether polyol is polyoxypropylene diol or polytetramethylene ether diol;
the polyester polyol is polyethylene glycol diglycol adipate dihydric alcohol or polypropylene glycol adipate dihydric alcohol.
The relative molecular weight of the polyoxypropylene diol is 1000-3000; the relative molecular weight of the polytetramethylene ether glycol is 1000-3000; the polyester polyol is polyethylene glycol diethylene glycol adipate glycol diol with the relative molecular weight of 1500-; the relative molecular weight of the poly (propylene glycol adipate) glycol is 1500-3500.
In the manufacturing process, the inner cavity of the mold needs to be vacuumized, and the process needs to use a special device and a method invented by '201721141643.3 patent of the applicant in 2017, a fluid bubble removing casting molding device suitable for mass production'.
The invention has the advantages that the sole is manufactured by adopting the pouring method, the process condition is simple, the energy is saved, the environment is protected, the shape of the sole is not limited, and various three-dimensional shapes can be manufactured. The polyurethane raw material prepared by the method can meet the process conditions of the polyurethane sole, can be reacted and cured at a lower temperature, does not need secondary vulcanization, and can reach the physical property requirement of the sole after being placed for 6-8 hours at normal temperature after being demoulded, thereby greatly improving the production efficiency and the environmental protection level of the preparation process. The polyurethane raw material prepared by the method has good adhesiveness, is self-shaped into an outsole in the curing process in a mold, can be bonded to the midsole or accessories, is firmly combined, and avoids solvent pollution caused by glue combination. The preparation method of the polyurethane raw material uses organic amine for catalysis, the cured polyurethane sole is nontoxic and tasteless and harmless to human bodies, the environment-friendly level of the sole material can be greatly improved, the polyurethane sole can be naturally degraded, and compared with other sole materials prepared by vulcanization and injection molding processes, the polyurethane sole material has the advantage of environmental protection, so that the pollution of the whole shoe industry to the environment is reduced.
Detailed Description
The present invention will be described in further detail with reference to examples.
Embodiment one of the invention
Weighing 100 parts by mass of polyethylene glycol diglycol adipate dihydric alcohol, heating and stirring to 120 ℃ with a relative molecular weight of 2000, carrying out vacuum heat preservation for 2 hours, cooling to 60 ℃, adding 100 parts by mass of diphenylmethane diisocyanate, stirring and heating to 90 ℃, carrying out vacuum heat preservation for 4 hours, measuring the-NCO content to 13.8%, then carrying out stirring and cooling to 50 ℃, and carrying out vacuum heat preservation for 4 hours to obtain a prepolymer.
Weighing 260 parts by mass of polyethylene glycol diglycol adipate dihydric alcohol, adding 28 parts by mass of diethylene glycol according to the relative molecular weight of 2000, stirring and heating to 105 ℃, carrying out vacuum heat preservation for 2 hours, cooling to 70 ℃, adding 3 parts by mass of triethylene diamine, stirring, and carrying out vacuum heat preservation for 4 hours to obtain the curing agent.
Heating the prepared prepolymer and curing agent at 50 ℃, wherein the mixing ratio is 100: 120, defoaming, and uniformly mixing, wherein the following steps are carried out: cleaning a closable mold, preheating the mold to enable the temperature in a mold cavity of the mold to reach 60 ℃, and closing the mold; b: vacuumizing the inner cavity of the mold to-0.1 Mpa, and keeping the air pressure of the inner cavity of the mold in a set vacuum state; c: pouring a mixture of the defoamed CPU polyurethane prepolymer and a curing agent into a mold cavity, and keeping the temperature of the mold at 70 ℃ after curing; d: curing and demolding after 15 minutes, standing at room temperature of 20 ℃ for 8 hours, and trimming to obtain the final polyurethane sole finished product. The physical properties of the polyurethane sole sheets were tested as follows: hardness ShoreA-62, abrasion resistance DIN-33, tensile strength 160kg/cm, tear strength 32N/mm, elongation 588%, specific gravity 1.17g/cm ℃, and no fracture after bending for 12 ten thousand times. The polyurethane sole is manufactured by using the special device and the method invented by patent document 201721141643.3 'a fluid bubble eliminating casting molding device suitable for mass production'.
Because the mould is closed and is not completely leveled by the gravity of the raw material fluid like an open casting mould, the shape is not limited, and the mould can be made into various three-dimensional shapes. The whole production process does not exceed 80 ℃, and the curing is carried out in a closed mold, so that volatile substances are not generated. The preparation process of the raw materials is under a vacuum environment, and the reaction temperature is about 80 ℃, so that volatile substances are not discharged. Compared with the sole made by vulcanization and injection molding, the sole made by the method has great change, and the temperature of vulcanization and injection molding is over 150 ℃, so the raw material made by the method is also environment-friendly and has no emission.
Example two
And (5) manufacturing the combined polyurethane sole. The special device and method invented by patent document 201721141643.3, "a fluid bubble-eliminating casting molding device suitable for mass production" is used.
A: cleaning a closable die, and preheating the die to 50-80 ℃;
b: placing the middle sole in a mold cavity, preheating the middle sole to 50-80 ℃ in advance, and closing the mold;
c: vacuumizing the inner cavity of the mold to-0.1 MPa; and keeping the air pressure of the inner cavity of the mold in a set vacuum state;
d: pouring a mixture of the defoamed CPU polyurethane prepolymer and a curing agent into a mold cavity, and keeping the temperature of the mold at 50-80 ℃ after curing;
e: after curing, opening the mold, taking out the molded combined polyurethane sole, standing for 6-8 hours at normal temperature until the physical property can meet the requirement, and trimming to obtain the final combined polyurethane sole finished product.
The insole can use various materials, polyurethane foaming insole, tpu foaming insole, Eva foaming insole, rubber foaming insole, including polyurethane hard bubble insole, pp insole, stereoplasm cardboard insole can all be put in the mould, this embodiment the insole also can be sole accessory or the combination of insole and sole accessory, if the sole accessory is the shoe-pad. The combined polyurethane sole is made by the pouring mode, the bonding capacities of various midsoles are different, and the polyurethane can be firmly bonded in the curing process only by performing simple primary coating treatment on the surface of the midsole. Through the design of the die, the insole and the outsole can have different position combination relations, can be combined by an upper layer and a lower layer, can also be combined by a front layer and a rear layer, can also be embedded and can also be coated in a three-dimensional way. The sole accessories refer to a plurality of decorative or functional accessories used in soles, and the accessories are not wear-resistant or waterproof, need a closed package for protection, prolong the performance of the accessories or protect printed patterns. The damping unit of the damping structure of the sole of the invention, which is disclosed in '201320225472.8 patent document "a damping structure with soft foaming material enclosed and wrapped by flexible airtight material" and' 201620290345 patent document "X patent document" all belong to the accessories for the sole, and polyurethane-coated sole accessories can be prepared by the casting method in the third embodiment to form a three-dimensional or partial coating for the accessories, so as to realize the design requirements and the functions of the accessories. Furthermore, the polyurethane covering accessory can be manufactured by covering various sole accessories with similar manufacturing technology without being limited to the manufacturing of accessories mentioned in the two patent documents.
EXAMPLE III
Weighing 100 parts by mass of polyethylene glycol diglycol adipate dihydric alcohol, heating and stirring to 120 ℃ with a relative molecular weight of 2000, carrying out vacuum heat preservation for 2 hours, cooling to 60 ℃, adding 100 parts by mass of diphenylmethane diisocyanate, stirring and heating to 90 ℃, carrying out vacuum heat preservation for 4 hours, measuring the-NCO content to 13.8%, then carrying out stirring and cooling to 50 ℃, and carrying out vacuum heat preservation for 4 hours to obtain a prepolymer.
Weighing 260 parts by mass of polyethylene glycol diglycol adipate dihydric alcohol, adding 28 parts by mass of diethylene glycol according to the relative molecular weight of 2000, stirring and heating to 105 ℃, carrying out vacuum heat preservation for 2 hours, cooling to 70 ℃, adding 3 parts by mass of triethylene diamine, stirring, and carrying out vacuum heat preservation for 4 hours to obtain the curing agent.
Heating the prepared prepolymer and curing agent at 50 ℃, wherein the mixing ratio is 100: 80, defoaming, and uniformly mixing, wherein the following steps are carried out: cleaning a closable mold, preheating the mold to enable the temperature in a mold cavity of the mold to reach 60 ℃, and closing the mold; b: vacuumizing the inner cavity of the mold to-0.1 Mpa, and keeping the air pressure of the inner cavity of the mold in a set vacuum state; c: pouring a mixture of the defoamed CPU polyurethane prepolymer and a curing agent into a mold cavity, and keeping the temperature of the mold at 50 ℃ after curing; d: curing and demolding after 30 minutes, standing at room temperature of 20 ℃ for 8 hours, and trimming to obtain the final polyurethane sole finished product. The physical properties of the polyurethane sole sheets were tested as follows: hardness ShoreA-62, abrasion resistance DIN-33, tensile strength 170kg/cm2The tear strength is 33N/mm, the elongation is 618 percent, the specific gravity is 1.17g/cm ℃, and the cable does not break after being bent for 12 ten thousand times.
Example four
Weighing 100 parts by mass of polyoxypropylene glycol, heating and stirring to 120 ℃ with the relative molecular weight of 1000, carrying out vacuum heat preservation for 2 hours, cooling to 60 ℃, adding 120 parts by mass of diphenylmethane diisocyanate, stirring and heating to 90 ℃, carrying out vacuum heat preservation for 4 hours, measuring-NCO content to 12.3%, then carrying out stirring and cooling to 50 ℃, and carrying out vacuum heat preservation for 4 hours to obtain a prepolymer.
Weighing 164 parts by mass of polytetramethylene ether glycol, adding 28 parts by mass of 1, 4-butanediol according to the relative molecular weight of 1500, stirring and heating to 105 ℃, carrying out vacuum heat preservation for 2 hours, cooling to 70 ℃, adding 1.5 parts by mass of triethylene diamine, stirring, and carrying out vacuum heat preservation for 4 hours to obtain the curing agent.
Heating the prepared prepolymer and curing agent at 60 ℃, wherein the mixing ratio is 100: 50, defoaming, and uniformly mixing, wherein the following steps are carried out: cleaning a closable die, preheating the die to enable the temperature in the die cavity of the die to reach 70 ℃, and closing the die; b: vacuumizing the inner cavity of the mold to-0.1 Mpa, and keeping the air pressure of the inner cavity of the mold in a set vacuum state; c: pouring a mixture of the defoamed CPU polyurethane prepolymer and a curing agent into a mold cavity, and keeping the temperature of the mold at 70 ℃ after curing; d: curing and demolding after 18 minutes, standing at room temperature of 20 ℃ for 6 hours, and trimming to obtain the final polyurethane sole finished product. The physical properties of the polyurethane sole sheets were tested as follows: hardness ShoreA-75, abrasion resistance DIN-45, tensile strength 280kg/cm2The tear strength is 45N/mm, the elongation is 650 percent, the specific gravity is 1.19g/cm ℃, and the cable does not break after being bent for 13 ten thousand times.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (8)
1. A manufacturing method of a polyurethane sole is characterized by comprising the following steps:
a: cleaning a closable die, preheating the die to 50-80 ℃, and closing the die;
b: vacuumizing the inner cavity of the mold to-0.1 Mpa, and keeping the air pressure of the inner cavity of the mold in a set vacuum state;
c: pouring a mixture of the defoamed CPU polyurethane prepolymer and a curing agent into a mold cavity, and keeping the temperature of the mold at 50-80 ℃ after curing;
d: after curing, opening the mold, taking out the formed polyurethane sole, standing for 6-8 hours at normal temperature until the physical property meets the requirement, and trimming to obtain the final polyurethane sole finished product.
2. The method of claim 1, further comprising the steps of:
a: cleaning a closable die, and preheating the die to 50-80 ℃;
b: placing the middle sole in a mold cavity, preheating the middle sole to 50-80 ℃ in advance, and closing the mold;
c: vacuumizing the inner cavity of the mold to-0.1 MPa; and keeping the air pressure of the inner cavity of the mold in a set vacuum state;
d: pouring a mixture of the defoamed CPU polyurethane prepolymer and a curing agent into a mold cavity, and keeping the temperature of the mold at 50-80 ℃ after curing;
e: after curing, opening the mold, taking out the molded combined polyurethane sole, standing for 6-8 hours at normal temperature until the physical property meets the requirement, and trimming to obtain the final combined polyurethane sole finished product.
3. The method of claim 1, further comprising the steps of:
a: cleaning a closable die, and preheating the die to 50-80 ℃;
b: placing the sole accessory to be coated in the mold cavity, preheating the accessory to 50-80 ℃ in advance, and closing the mold;
c: vacuumizing the inner cavity of the mold to-0.1 MPa; and keeping the inner cavity of the mold in a set vacuum state;
d: pouring a mixture of the defoamed CPU polyurethane prepolymer and a curing agent into a mold cavity, and keeping the temperature of the mold at 50-80 ℃ after curing;
e: and after curing, opening the mold, taking out the molded polyurethane coated sole accessory, standing for 6-8 hours at normal temperature until the physical property meets the requirement, and trimming to obtain the final finished product of the polyurethane coated sole accessory.
4. The method for manufacturing a polyurethane sole according to claim 1, wherein the mixing ratio of the CPU type polyurethane prepolymer to the curing agent is 100: (40-120) by mass, and uniformly mixing at the temperature of 50-60 ℃; under the condition that the temperature of the die is kept between 50 and 80 ℃, the mixture of the CPU type polyurethane prepolymer and the curing agent reacts in the die cavity for 10 to 30 minutes for curing and forming, the physical property of the formed polyurethane sole meets the requirement after being placed for 6 to 8 hours at normal temperature, and the final polyurethane sole finished product is obtained.
5. The method for manufacturing a polyurethane sole as claimed in claim 4, wherein the CPU type polyurethane prepolymer is prepared by stirring and heating 100 parts by mass of polyether polyol or polyester polyol to 100-; the chain extender is diphenylmethane diisocyanate; the polyether polyol is polyoxypropylene diol or polytetramethylene ether diol; the polyester polyol is polyethylene glycol diglycol adipate dihydric alcohol or polypropylene glycol adipate dihydric alcohol.
6. The method for making polyurethane soles according to claim 4, wherein the curing agent is prepared by adding chain extender into 100-200 parts by mass of polyether polyol or 200-300 parts by mass of polyester polyol, stirring and heating to 100-120 ℃, vacuum-preserving heat for 2 hours, cooling to 60-80 ℃, adding 0.5-3.5 parts by mass of triethylene diamine, stirring, and vacuum-preserving heat for 4 hours; the chain extender is 10-30 parts by mass of 1, 4-butanediol; the polyether polyol is polyoxypropylene diol or polytetramethylene ether diol; the polyester polyol is polyethylene glycol diglycol adipate dihydric alcohol or polypropylene glycol adipate dihydric alcohol.
7. The method for making polyurethane soles according to claim 4, wherein the curing agent is prepared by adding chain extender into 100-200 parts by mass of polyether polyol or 200-300 parts by mass of polyester polyol, stirring and heating to 100-120 ℃, vacuum-preserving heat for 2 hours, cooling to 60-80 ℃, adding 0.5-3.5 parts by mass of triethylene diamine, stirring, and vacuum-preserving heat for 4 hours; the chain extender is 10-40 parts by mass of diethylene glycol; the polyether polyol is polyoxypropylene diol or polytetramethylene ether diol; the polyester polyol is polyethylene glycol diglycol adipate dihydric alcohol or polypropylene glycol adipate dihydric alcohol.
8. The method for manufacturing a polyurethane sole as claimed in claim 5, 6 or 7, wherein the polyoxypropylene diol has a relative molecular weight of 1000-3000; the relative molecular weight of the polytetramethylene ether glycol is 1000-3000; the polyester polyol is polyethylene glycol diethylene glycol adipate glycol diol with the relative molecular weight of 1500-; the relative molecular weight of the poly (propylene glycol adipate) glycol is 1500-3500.
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| CN113334660B (en) * | 2021-04-27 | 2023-08-01 | 东莞市今创塑胶有限公司 | Manufacturing equipment of polyurethane sole |
| CN113416291A (en) * | 2021-06-25 | 2021-09-21 | 东莞豪峻橡塑有限公司 | Ultrahigh-performance environment-friendly sneaker outsole replacing vulcanized rubber, preparation method and forming equipment thereof |
| CN114986779A (en) * | 2022-05-25 | 2022-09-02 | 福州瑞诚鞋材模具有限公司 | Production process for pouring shoemaking |
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