A polyurethane and rubber synthetic infusion bottom process

Abstract

The invention relates to a polyurethane and rubber synthetic infusion sole process, which comprises the following steps: a first step, making a rubber sole mold and producing a rubber sole; a second step, making a polyurethane outsole mold and a cover plate, wherein the polyurethane outsole mold is arranged between the rubber sole mold and the cover plate; putting the rubber sole back into the rubber sole mold; and adding a layer of rubber mold-absorbing sheet on the rubber sole; a third step, preparing a polyurethane sole stock solution, injecting the polyurethane sole stock solution into the polyurethane outsole mold, melting the rubber mold-absorbing sheet by the temperature of the polyurethane sole stock solution and the rubber sole, maintaining the temperature between 70°C and 80°C for 5 to 6 minutes to form the polyurethane, melting the polyurethane and the rubber sole through the rubber mold-absorbing sheet to ensure the firmness of the sole, and manufacturing the infusion sole with the rubber bottom layer and the polyurethane upper layer.

Description

Technical Field

[0001] The invention relates to the technical field of sole production technology, in particular to a polyurethane and rubber synthetic infusion sole process. Background Art

[0002] There are many kinds of shoes in daily life, including formal, casual, sports, slippers and other products. Different shoes use different materials and have different functions. Some shoes are heavy, and some shoes are light, which is caused by different materials. Different materials have different special properties. For example, tendons and rubber materials are more wear-resistant; EVA and other foam materials are lighter and suitable for sports; PU materials are also lighter and suitable for various casual shoes, but they do not have wear-resistant and non-slip properties; so according to people's wearing needs, it is necessary to develop a new type of infusion combination process, which uses molds, temperatures, processes and other processes to infuse two or more materials, and then combine them together to form a sole, and make the sole have PU, rubber and other characteristics.

[0003] Although conventional polyurethane outsoles are very light, they are not wear-resistant, non-slip, and more easily hydrolyzed. The most important thing is that polyurethane outsoles are prone to decomposition in a closed environment and turn into powder under pressure. In addition, polyurethane outsoles are easily broken at low temperatures. Often, the soles of a pair of shoes are broken while the uppers are still intact.

[0004] Because of the weakness of PU outsole, many sandals in the prior art have a rubber sheet underneath to prevent slipping and resist wear. However, such rubber veneer is often glued on with glue, so it is easy to fall off after a long time, and the value of such a pair of shoes is lost.

[0005] Nowadays, many of the soles commonly used in life are made of rubber materials. Generally, casual shoes and formal shoes have rubber soles, but such rubber materials are relatively heavy, so the comfort and experience of the shoes are not very good. Because the soles are heavy, the whole shoe looks very bulky. Summary of the invention

[0006] The present invention aims to provide a polyurethane and rubber synthetic infusion sole process. The technical problem to be solved at least includes how to infuse and then shape two different materials to produce a new type of special sole, and finally obtain a sole product with dual characteristics of both the wear-resistant and anti-skid functions of rubber and the lightweight effect of polyurethane.

[0007] In order to achieve the above object, the present invention provides a polyurethane and rubber synthetic infusion bottom process, comprising the following steps:

[0008] The first step is to make a rubber sole mold, and use the rubber sole mold to produce the rubber sole;

[0009] The second step is to make a polyurethane outsole mold and a cover plate, and hinge the rubber outsole mold, the polyurethane outsole mold and the cover plate together to form a shoe mold; the polyurethane outsole mold is arranged between the rubber outsole mold and the cover plate; the rubber outsole produced in the first step is put back into the rubber outsole mold; and a layer of rubber mold-absorbing sheet is added on the rubber outsole;

[0010] The third step is to prepare a polyurethane sole stock solution, rotate the polyurethane outsole mold to cover the rubber bottom mold and the rubber bottom installed in the rubber bottom mold, inject the polyurethane sole stock solution into the polyurethane outsole mold, rotate the cover plate to cover the polyurethane outsole mold and the polyurethane sole stock solution, the polyurethane sole stock solution and the rubber bottom sandwich the rubber mold suction sheet in the middle, melt the rubber mold suction sheet by the temperature of the polyurethane sole stock solution and the rubber bottom, maintain the temperature between 70°C and 80°C and form the polyurethane for 5 to 6 minutes, melt the polyurethane and the rubber bottom through the rubber mold suction sheet to ensure the firmness of the sole, and produce a perfusion sole with a rubber bottom layer and a polyurethane upper layer.

[0011] Preferably, the specific steps of using the rubber bottom mold to produce the rubber bottom in the first step include cleaning the rubber bottom mold, adjusting the rubber bottom mold, spraying a release agent, placing the rubber raw material, and placing it in a pressure device for molding.

[0012] Preferably, the specific steps of injecting the polyurethane sole stock solution into the polyurethane outsole mold in the second step include cleaning the polyurethane outsole mold, adjusting the polyurethane outsole mold, spraying a release agent, injecting polyurethane raw materials and in-mold molding.

[0013] Preferably, the step of preparing the polyurethane sole stock solution in the third step is specifically as follows: the polyurethane sole stock solution comprises component A, component B and component C, wherein component A is obtained by fully mixing a polyether polyol, a chain extender, a foaming agent, a catalyst and a foaming agent in a mixer; component B is a modified isocyanate or liquefied MDI; and component C is a catalyst.

[0014] Preferably, the polyether polyol is a mixed polyol containing both ether and ester.

[0015] Preferably, the specific steps of injecting the polyurethane sole stock solution into the polyurethane outsole mold in the third step are: completely melting the components A and B of the polyurethane sole stock solution in a raw material preheating oven, adding them into the stock solution tank of the sole molding machine respectively, adjusting the metering pump speeds of the components A and B respectively according to the formula requirements and the pouring amount, injecting the components A and B of the polyurethane sole stock solution from the stock solution tank into the mixing device through the metering pump, mixing the components A and B of the polyurethane sole stock solution uniformly through high-speed stirring in the mixing device to produce a chemical reaction, pouring the mixture in the mixing device into the polyurethane outsole mold, adjusting the pouring time set by the computer program controller according to the size of the shoe mold cavity in the polyurethane outsole mold, rotating the cover plate to cover the polyurethane outsole mold and the polyurethane sole stock solution to form a shoe mold, and sending the cover plate to the annular production line drying tunnel for heating and maturation, and the solidified sole is demoulded, trimmed, sorted and inspected to obtain a finished product.

[0016] Preferably, before injecting the components A and B of the polyurethane shoe sole stock solution from the stock solution tank into the mixing device through the metering pump, the component C and the color paste are first added to the component A as required.

[0017] Preferably, when producing a two-color sole, the polyurethane sole stock solution must be poured a second time on the sole after the first curing.

[0018] Preferably, the preparation process of the rubber used to produce the rubber sole in the first step is: raw material weighing - mixing - wheel refining - wheel sheeting - storage - bulk material and ingredient weighing - bulk material and ingredient wheel refining - bulk material and ingredient wheel sheeting - cutting - vulcanization - secondary vulcanization of foam sole - roughing - cutting - trimming - finishing - shipment.

[0019] Preferably, the storage is for at least 24 hours.

[0020] Beneficial Effects

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The polyurethane and rubber synthetic infusion sole process described in the present invention combines two materials with different properties, polyurethane (PU) and rubber, by infusion, and the two different materials are infused and molded by changing the mold, the process flow, the temperature, etc., to produce a new type of special sole.

[0023] According to the polyurethane and rubber synthetic infusion sole process of the present invention, after the rubber outsole is formed, a layer of rubber mold-absorbing sheet is added on the rubber outsole, and after the mold-absorbing sheet is placed, the polyurethane material is injected, and the polyurethane is formed at a temperature between 70° C. and 80° C. for 5-6 minutes. This temperature allows the rubber mold-absorbing sheet to melt and cross-link with the rubber and polyurethane better, thereby ensuring the firmness of the sole. In this way, a new type of infusion sole can be produced, in which the bottom layer of the sole is rubber and the upper layer of the sole is polyurethane, which is both wear-resistant and non-slip and light and soft. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the specific implementation methods of the present application, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0025] Figure 1 It is a structural schematic diagram of the polyurethane outsole mold and the rubber bottom mold of the present invention. DETAILED DESCRIPTION

[0026] The present invention is described in more detail hereinafter to facilitate understanding of the present invention.

[0027] like Figure 1 As shown, the polyurethane and rubber synthetic infusion bottom process of the present invention comprises the following steps:

[0028] The first step is to make a rubber sole mold 1, and use the rubber sole mold to produce a rubber sole;

[0029] Step 2: Make a polyurethane outsole mold 2 and a cover plate 3, hinge the rubber outsole mold 1, the polyurethane outsole mold 2 and the cover plate 3 together through a hinge 4 to form a shoe mold; the polyurethane outsole mold 2 is set between the rubber outsole mold 1 and the cover plate 3; put the rubber outsole produced in the first step back into the rubber outsole mold 1; and add a layer of rubber mold-absorbing sheet on the rubber outsole;

[0030] The third step is to prepare a polyurethane sole stock solution, rotate the polyurethane outsole mold 2 to cover the rubber bottom mold 1 and the rubber bottom installed in the rubber bottom mold 1, inject the polyurethane sole stock solution into the polyurethane outsole mold 2, rotate the cover plate 3 to cover the polyurethane outsole mold 2 and the polyurethane sole stock solution, the polyurethane sole stock solution and the rubber bottom sandwich the rubber mold suction sheet in the middle, melt the rubber mold suction sheet by the temperature of the polyurethane sole stock solution and the rubber bottom, maintain the temperature between 70°C and 80°C and form the polyurethane for 5 to 6 minutes, melt the polyurethane and the rubber bottom through the rubber mold suction sheet, ensure the firmness of the sole, and produce a new type of perfusion sole with rubber as the bottom layer and polyurethane as the upper layer, which is both wear-resistant, non-slip, light and soft.

[0031] Because the melting temperature of conventional rubber is about 160 degrees Celsius, this temperature can completely melt the raw materials of rubber into the shape of the mold, that is, the rubber outsole is made. When the rubber outsole is first formed, the temperature of the polyurethane injected later is just around 80℃, which just ensures that the connection between the rubber outsole and the polyurethane outsole is in a semi-dissolved state and better combined with the polyurethane. Because this temperature is difficult to control, and there is also a concern that due to different material formulas and different fusion agents, sometimes the two materials will break when combined. Now a process has been added, which is also a new process flow. After the rubber outsole is formed, a layer of rubber suction mold sheet is added on it, and the polyurethane material is injected after the rubber suction mold sheet is placed. After 5-6 minutes, the temperature between 70℃-80℃ allows the polyurethane to be formed. This temperature is just right for the rubber suction mold sheet to melt better with the rubber and polyurethane, ensuring the firmness of the sole. In this way, a new type of perfusion sole with rubber as the bottom layer and polyurethane as the upper layer of the sole can be made, which is both wear-resistant and non-slip, and light and soft.

[0032] Preferably, the thickness of the rubber mold-absorbing sheet is one-thirtieth to one-tenth of the thickness of the rubber sole, and the rubber mold-absorbing sheet is vulcanized so that the rubber mold-absorbing sheet can melt at a temperature between 70° C. and 80° C. and cross-link with the rubber sole and the polyurethane.

[0033] The applicant discovered during the experiment that, when the thickness is within a certain range, the thinner the rubber mold-absorbing sheet is, the lower the temperature required for melting. By controlling the thickness of the rubber mold-absorbing sheet to be between one-thirtieth and one-tenth of the thickness of the rubber base and coordinating with vulcanization treatment, the rubber mold-absorbing sheet can be melted at a temperature between 70°C and 80°C.

[0034] The polyurethane and rubber synthetic infusion bottom process of the present invention is specifically divided into two parts, one is the material proportioning part, and the other is the mold part.

[0035] The specific steps of using the rubber bottom mold to produce the rubber bottom in the first step include cleaning the rubber bottom mold, adjusting the rubber bottom mold, spraying a release agent, placing raw materials, and placing in a pressure device for molding.

[0036] The specific steps of injecting the polyurethane sole stock solution into the polyurethane outsole mold in the second step include cleaning the polyurethane outsole mold, adjusting the polyurethane outsole mold, spraying a release agent, injecting polyurethane raw materials and in-mold molding.

[0037] The rubber is first molded, then put into the suction mold sheet, and then injected with polyurethane material for molding. The material ratio part is mainly divided into the preparation of rubber and the preparation of polyurethane sole stock solution.

[0038] Polyurethane sole stock solution can be divided into two types: polyester type and polyether type. The polypropylene glycol system was developed in the early years, and now it is mostly polyester type system. Due to their different properties, the preparation methods are also different.

[0039] The preparation of polyester PU sole stock solution mostly adopts the prepolymer method or semi-prepolymer method, which can generally be made into two-component or three-component. Component A is composed of part of polyester, chain extender, foaming agent and foaming agent, which are mixed and degassed. In the all-water foaming system, the foaming agent is water, and the amount of water in component A must be measured, and its content is generally about 0.4%. Component B is a terminal isocyanate prepolymer obtained by the reaction of part of polyester polyol and isocyanate. The relative molecular mass of polyester polyol is preferably 1500 to 2000. In isocyanate, the ratio of pure MDI (4,4' diphenylmethane diisocyanate) to liquefied MDI is 19:1. During the reaction, an inhibitor of one ten-thousandth of the mass of the raw material must be added to hinder the occurrence of side reactions, and the temperature can be kept for 2h to 3h, and the NCO% is controlled at about 19%. Component C is a catalyst (added to component A to form a two-component stock solution). The three-component system is suitable for two-color, low-hardness sports shoes and low-density sandals. When using, first mix component A and component C evenly, and then mix with component B. Its characteristics are small reduction in viscosity and reactivity, small changes in hardness and size of the product, and good molding stability.

[0040] In this application, NCO refers to aromatic polyisocyanate based on diphenylmethane diisocyanate, and NCO% is the NCO value. The NCO value refers to the mass of NCO groups contained in 100g of curing agent.

[0041] The NCO value test method is as follows:

[0042] Unless otherwise specified, all reagents used in this test method are chemically pure or above. The water content of n-butyl acetate is required to be ≤ 0.1%, and the alcohol content is ≤ 0.15%. The distilled water used shall comply with the requirements of GB / T6682-1992 Laboratory Grade III Water.

[0043] Solution preparation:

[0044] Di-n-butylamine-n-butyl acetate solution:

[0045] Measure 10 mL of di-n-butylamine and add it to 50 mL of n-butyl acetate, mix well, and place in a sealed container. This solution is ready for use.

[0046] 0.5mol / L HCl standard solution: prepared and calibrated according to GB / T601-1988.

[0047] 0.1% (m / V) bromocresol green indicator:

[0048] Weigh 0.1 g of bromocresol green and dissolve it in 100 mL of anhydrous ethanol.

[0049] How to do it:

[0050] First add 20mL of butyl acetate into a conical flask, then accurately weigh (1-1.5)g (accurate to 0.001g) of curing agent and place it into a ground-mouth conical flask with a stopper, accurately transfer 20mL of di-n-butylamine butyl ester solution with a pipette, cover with a stopper, gently shake to dissolve and mix evenly, let stand for 20 minutes, then add 20mL of anhydrous ethanol, shake well, drop in (3-5) drops of 0.1% bromocresol green indicator, and titrate with 0.5mol / L HCl standard solution until it just turns yellow as the titration end point, and perform a blank test at the same time.

[0051] calculate:

[0052] The NCO value is calculated according to formula (1).

[0053] NCO value (%) = (V0-V1) × CHCl × 4.2 / m (1)

[0054] In formula (1), V0 is the volume of HCl standard solution consumed in the blank test, mL;

[0055] V1——The volume of HCl standard solution consumed by the sample, mL;

[0056] CHCl—— concentration of HCl standard solution, mol / L;

[0057] m——sample mass, g.

[0058] The result is:

[0059] The arithmetic mean of the parallel measurement results shall be taken as the measurement result. The absolute error of the parallel measurement results shall not be greater than 0.2%.

[0060] The preparation of polyether polyurethane sole stock solution mostly adopts a one-step method. The polyether polyurethane sole stock solution also includes component A, component B and component C, wherein component A is obtained by fully mixing polyether polyol, chain extender, foaming agent and foam leveling agent in a mixer; component B is modified isocyanate or liquefied MDI. Component C is a catalyst. Polyether polyol can give the sole high strength, wear resistance, strong adhesion to the upper and other characteristics. The polyether polyurethane sole overcomes the shortcomings of poor water resistance and poor low-temperature elasticity of polyester polyurethane soles, and has good formability. While giving excellent low-temperature compliance and elasticity, the physical and mechanical properties of the sole can be kept basically unchanged. Under low-density conditions, the dimensional stability of polyester soles is poor, while the dimensional stability of polyether soles is good at the same density, but the mechanical properties are low. Therefore, in the water foaming system, the two alcohols can be mixed in a certain proportion to improve the mechanical strength and wear resistance of the product. For example, polyether 2 ester polyol is a mixed polyol containing both ether and ester, and the performance of its sole material is between polyester type and polyether type. With domestic polyether as the main raw material and a specific amount of polyester polyol, polyester 2 ether type foaming sole material is synthesized, and its physical and mechanical properties are better than those of GB10508289, and the cost is 10% to 15% lower than that of pure polyester PU sole material.

[0061] Preferably, the chain extender is diethyltoluenediamine or 3,5-dimethylthiotoluenediamine.

[0062] Chain extenders are commonly used low molecular weight compounds such as diols and diamines, mainly diamines.

[0063] Preferably, the blowing agent is polyether or isocyanate.

[0064] Preferably, the foam leveling agent is an organic silicon surfactant or a polysiloxane-olefin oxide intercalated copolymer.

[0065] Foam stabilizer is one of the essential raw materials in the foaming process of polyurethane foam plastics and plays a key role in foaming. Silicone surfactant is also called foam stabilizer and foam stabilizer.

[0066] The polyether-modified foam levelers used in polyurethane foam are mostly polyether grafted or block-type (hydrophilic and hydrophobic groups are both on the main chain) structures, such as polysiloxane-olefin oxide intercalated copolymers. The polysiloxane segments are hydrophobic and the polyolefin oxide segments are hydrophilic. Their coexistence plays a role in interface orientation, improves the compatibility of various raw materials, and can reduce the dispersed particle size to a microemulsion state, so that they can be emulsified into a uniform system, which is called solubilization and emulsification in the art.

[0067] Preferably, the catalyst is triethylenediamine (TEDA) solution.

[0068] The catalyst used in the present application is a strong gel-type tertiary amine catalyst, which can be used to catalyze the urethane (polyol-isocyanate) reaction of flexible foam.

[0069] The molding process of the polyurethane sole is specifically as follows: the components A and B of the polyurethane sole stock solution are completely melted in a raw material preheating oven, and are added to the stock solution tank of the sole molding machine respectively; the metering pump speeds of the two components (component A and component B) are adjusted according to the formula requirements and the pouring amount; the components A and B of the polyurethane sole stock solution are injected from the stock solution tank into the mixing device through the metering pump; the components A and B of the polyurethane sole stock solution are uniformly mixed in the mixing device through high-speed stirring to generate a chemical reaction; and the mixture in the mixing device is poured into the The polyurethane outsole mold 2 is formed by a mold 3, and the pouring time set by the computer program controller is adjusted according to the size of the shoe mold cavity in the polyurethane outsole mold 2. The shoe mold after being covered (i.e., the cover plate 3 is rotated to cover the polyurethane outsole mold 2 and the polyurethane sole stock solution) is sent to the drying tunnel of the circular production line to be heated and matured (the production of two-color soles must be cured and then poured for the second time). The cured PU sole is demoulded, trimmed, sorted and inspected to be a finished product. The shoe mold is sprayed with a release agent and then sent for pouring. The speed of the production line can be adjusted according to the maturation requirements of the stock solution during the entire production cycle.

[0070] Preferably, before injecting the components A and B of the polyurethane sole stock solution from the stock solution tank into the mixing device through the metering pump, the component C (catalyst) and color paste are first added to the component A as required.

[0071] Preferably, the rubber preparation process is: raw material weighing - mixing - wheel refining - wheel sheeting - storage (at least 24 hours) - bulk material and ingredient weighing - bulk material and ingredient wheel refining - bulk material and ingredient wheel sheeting - cutting - vulcanization - secondary vulcanization of foam bottom - roughing - cutting - trimming - finishing - shipping.

[0072] The basic formula materials used in the preparation of rubber include:

[0073] (1) Rubber (NR and SR). Rubber (natural rubber, synthetic rubber);

[0074] (2)Promoting agent.

[0075] (3) Curng agent. Curing agent, also called bridging agent;

[0076] (4) Activator.

[0077] (5) Others: additives (fillers, processing aids, protective agents, pigments, etc.).

[0078] Among them, the components of natural rubber include: 80% liquid rubber and 20% solid rubber by mass.

[0079] The characteristics of natural rubber include: a. High viscosity; b. Easier to process than synthetic rubber; c. Good tearing strength, tension, heat resistance, high elasticity, and good structure, but the physical properties are not stable enough.

[0080] Types of natural rubber include: Raw rubber No. 3, standard rubber;

[0081] The origins of natural rubber include: subtropical and tropical rainforest areas (Malaysia, Thailand, Brazil, etc.).

[0082] Preferably, if Figure 1 As shown, the hinge 4 can be set on the top of the rubber sole mold 1, the polyurethane outsole mold 2 and the cover plate 3 (i.e., at the position of the toe), or on the side of the rubber sole mold 1, the polyurethane outsole mold 2 and the cover plate 3 (i.e., at the position of the arch of the shoe). The rubber sole mold 1, the polyurethane outsole mold 2 and the cover plate 3 are hinged together by the hinge 4 to form a shoe mold, the polyurethane outsole mold 2 is placed in the middle, and the rubber sole mold 1 is placed on one side of the polyurethane outsole mold 2 through the side hinge 4, or placed in front of the polyurethane outsole mold 2 through the top hinge 4, that is, the rubber sole mold 1 can be rotated by flipping, which can be flipped on the left and right sides, or flipped on the front and back.

[0083] In short, the polyurethane and rubber synthetic infusion bottom process described in the present invention is a new production process that combines two materials, that is, rubber and polyurethane are combined together, and the two materials are perfectly combined through the combination of multiple molds, the combination of multiple process flows, and the combination of temperature differences.

[0084] The above describes the preferred embodiments of the present invention, but it is not intended to limit the present invention. Those skilled in the art may make improvements and changes to the embodiments disclosed herein without departing from the scope and spirit of the present invention.

Claims

1. A polyurethane and rubber synthetic infusion bottom process, characterized in that: The polyurethane and rubber synthetic infusion bottom process comprises the following steps: The first step is to make a rubber sole mold, and use the rubber sole mold to produce the rubber sole; The second step is to make a polyurethane outsole mold and a cover plate, and hinge the rubber outsole mold, the polyurethane outsole mold and the cover plate together to form a shoe mold; the polyurethane outsole mold is arranged between the rubber outsole mold and the cover plate; the rubber outsole produced in the first step is put back into the rubber outsole mold; and a layer of rubber mold-absorbing sheet is added on the rubber outsole; The third step is to prepare a polyurethane sole stock solution, rotate the polyurethane outsole mold to cover the rubber bottom mold and the rubber bottom installed in the rubber bottom mold, inject the polyurethane sole stock solution into the polyurethane outsole mold, rotate the cover plate to cover the polyurethane outsole mold and the polyurethane sole stock solution, the polyurethane sole stock solution and the rubber bottom sandwich the rubber mold-absorbing sheet in the middle, melt the rubber mold-absorbing sheet by the temperature of the polyurethane sole stock solution and the rubber bottom, maintain the temperature between 70°C and 80°C and form the polyurethane for 5 to 6 minutes, melt the polyurethane and the rubber bottom through the rubber mold-absorbing sheet, and cross-link them together to ensure the firmness of the sole, so as to produce a perfusion sole with a rubber bottom layer and a polyurethane upper layer; The specific steps of using the rubber sole mold to produce the rubber sole in the first step include cleaning the rubber sole mold, adjusting the rubber sole mold, spraying a release agent, placing the rubber raw material, and placing it in a pressure device for molding; The specific steps of injecting the polyurethane sole stock solution into the polyurethane outsole mold in the second step include cleaning the polyurethane outsole mold, adjusting the polyurethane outsole mold, spraying a release agent, injecting polyurethane raw materials and in-mold molding.

2. The polyurethane and rubber synthetic infusion bottom process according to claim 1, characterized in that: The steps for preparing the polyurethane sole stock solution described in the third step are specifically as follows: the polyurethane sole stock solution includes component A, component B and component C, wherein component A is obtained by fully mixing polyether polyol, chain extender, foaming agent, catalyst and foaming agent in a mixer; component B is modified isocyanate or liquefied MDI; component C is a catalyst.

3. The polyurethane and rubber synthetic infusion bottom process according to claim 2 is characterized in that: The polyether polyol is a mixed polyol containing both ether and ester.

4. The polyurethane and rubber synthetic infusion bottom process according to claim 2 is characterized in that: The specific steps of injecting the polyurethane sole stock solution into the polyurethane outsole mold in the third step are as follows: completely melting the components A and B of the polyurethane sole stock solution in a raw material preheating oven, respectively adding them into the stock solution tank of the sole molding machine, adjusting the speed of the metering pumps of the components A and B according to the formula requirements and the pouring amount, injecting the components A and B of the polyurethane sole stock solution from the stock solution tank into the mixing device through the metering pump, mixing the components A and B of the polyurethane sole stock solution uniformly through high-speed stirring in the mixing device to produce a chemical reaction, pouring the mixture in the mixing device into the polyurethane outsole mold, adjusting the pouring time set by the computer program controller according to the size of the shoe mold cavity in the polyurethane outsole mold, rotating the cover plate to cover the polyurethane outsole mold and the polyurethane sole stock solution to form a shoe mold, and sending it to the drying tunnel of the circular production line for heating and maturation, and the solidified sole is demoulded, trimmed, sorted and inspected to obtain a finished product.

5. The polyurethane and rubber synthetic infusion bottom process according to claim 4 is characterized in that: Before injecting the components A and B of the polyurethane sole stock solution from the stock solution tank into the mixing device through the metering pump, first add the component C and the color paste into the component A as required.

6. The polyurethane and rubber synthetic infusion bottom process according to claim 4, characterized in that: When producing two-color soles, a second coat of polyurethane sole stock solution must be poured on the sole after the first curing.

7. The polyurethane and rubber synthetic infusion bottom process according to claim 1, characterized in that: The preparation process of the rubber used to produce the rubber sole in the first step is: raw material weighing - mixing - wheel refining - wheel sheeting - storage - bulk material and ingredient weighing - bulk material and ingredient wheel refining - bulk material and ingredient wheel sheeting - cutting - vulcanization - secondary vulcanization of foam sole - roughing - cutting - trimming - finishing - shipment.

8. The polyurethane and rubber synthetic infusion bottom process according to claim 7, characterized in that: The storage mentioned is for at least 24 hours.

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