Preparation process of PUR hot melt adhesive for sofa assembly

Abstract

The invention discloses a preparation process of a PUR hot melt adhesive for sofa assembly, and belongs to the technical field of hot melt adhesive production.The preparation process of the PUR hot melt adhesive for sofa assembly comprises the specific implementation steps that firstly, metering, storage and pretreatment of raw materials are completed; 2, mixing, reacting and filtering the raw materials, and controlling operation conditions; 3, cooling forming of the mixture is completed, and a crude product is formed; and step 4, completing screening and slitting of the crude product to form a final product, and re-metering and storing the final product. The production temperature change and time are effectively controlled, and the finally produced PUR hot melt adhesive is ensured to have higher melting point and better viscosity, so that the PUR hot melt adhesive better meets the assembly and use requirements of sofas.

Description

Technical Field

[0001] The invention relates to the technical field of hot melt adhesive production, and more specifically to a preparation process of PUR hot melt adhesive for sofa assembly. Background Art

[0002] Hot melt adhesive is a plastic adhesive. Its physical state changes with temperature within a certain temperature range, but its chemical properties remain unchanged. It is non-toxic and tasteless, and is an environmentally friendly chemical product. It is a solid product that is easy to package, transport and store. It is solvent-free, pollution-free and non-toxic. It is also popular for its simple production process, high added value, high bonding strength and fast speed.

[0003] At present, in the hot melt adhesive production process, when the traditional hot melt adhesive is prepared and applied to the assembly of a sofa set, when the temperature of the sofa is high, the hot melt adhesive is prone to softening, thereby reducing the viscosity of the hot melt adhesive.

[0004] Therefore, in view of this, the existing structure is studied and improved, and a preparation process of PUR hot melt adhesive for sofa assembly is provided, in order to achieve a more practical purpose. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a preparation process of PUR hot melt adhesive for sofa assembly, which can effectively control the temperature change and time of production, ensure that the final produced PUR hot melt adhesive has a higher melting point and better viscosity, so that the PUR hot melt adhesive can better meet the needs of sofa assembly and use.

[0007] 2. Technical solution

[0008] To solve the above problems, the present invention adopts the following technical solutions.

[0009] A preparation process of PUR hot melt adhesive for sofa assembly, the specific implementation steps of the preparation process are as follows:

[0010] Step 1: Complete the measurement, storage and pretreatment of raw materials;

[0011] The raw materials of PUR hot melt adhesive are taken, and the raw materials include solid polyester polyol, liquid polyurethane, liquid diphenylmethane and tackifying resin. According to the preparation amount of PUR hot melt adhesive, the required amount of each raw material is calculated respectively, and then each raw material is measured and taken respectively according to the mass ratio;

[0012] The solid polyester polyol is pre-processed by crushing so that the solid polyester polyol is stored in a powder state, and at the same time, the solid polyester polyol, liquid polyurethane, liquid diphenylmethane and tackifying resin are sealed and stored in containers respectively;

[0013] Step 2: Complete the mixing, reaction, and filtration of the raw materials, and control the operating conditions:

[0014] Taking a reactor, cleaning, disinfecting, drying and preheating the reactor, and setting a cleaned stirring structure in the reactor;

[0015] Add the measured raw materials in proportion by mass into the reactor, while continuously stirring and controlling the temperature for heating to achieve a complete reaction and form a mixture;

[0016] Then the mixture in the reactor is discharged into a cooling container, during which the mixture is filtered and impurities are removed;

[0017] Step 3: Complete the cooling and molding of the mixture to form a rough product:

[0018] Control the temperature of the cooling container during cooling to gradually cool the mixture until the mixture forms a uniform bulk coarse product;

[0019] Step 4: Complete the screening and cutting of the rough products to form the final products, and then re-measure and store them:

[0020] Cut the coarse product and remove the unevenly mixed part of the coarse product;

[0021] The remaining parts are divided and the divided products are re-measured and stored according to the amount.

[0022] Furthermore, in the step 1, the mass ratio of solid polyester polyol, liquid polyurethane, liquid diphenylmethane and tackifying resin is (285-295): (195-210): (235-250): (120-132);

[0023] Among them, the total mass fractions of solid polyester polyol, liquid polyurethane and liquid diphenylmethane are less than 750.

[0024] Furthermore, in the step 2, when the reactor is preheated, the preheating temperature is 123°C;

[0025] After preheating is completed, continue heating to maintain the heating kettle at the preheated temperature, the temperature range is 115℃~128℃.

[0026] Furthermore, in step 2, when adding raw materials to the reactor:

[0027] First, add powdered solid polyester polyol until the powdered solid is completely melted;

[0028] Then, liquid polyurethane, liquid diphenylmethane and tackifying resin are added.

[0029] Furthermore, in the step 2, while continuously stirring, butylated hydroxybenzoate catalyst, polybutadiene adhesive, plasticizer and pure water are added;

[0030] The addition ratio of butyl hydroxybenzoate catalyst, polybutadiene adhesive, plasticizer, pure water and solid polyester polyol is (10-12): (13-25): (21-24): (300-500): (285-295).

[0031] Furthermore, in the step 2, after the raw materials are added to the reactor, heating is performed, the temperature is controlled within a range of 232° C. to 248° C., and the duration of heating is controlled to be no less than 3 hours;

[0032] During the heating process, antioxidant is continuously added, and the total weight fraction ratio of the antioxidant is 10 to 12.

[0033] Furthermore, in step 2, a filter screen with 80 mesh or 100 mesh is selected for filtering.

[0034] Furthermore, in step 3, during cooling, the cooling temperature is controlled, specifically:

[0035] Rapidly lower the temperature to 180°C-195°C and maintain this temperature for 10 minutes;

[0036] Slowly lower the temperature to 80-90°C and maintain this temperature for 30-40 minutes;

[0037] Slowly lower the temperature to room temperature;

[0038] Wait for the rough product to cool and take shape.

[0039] Furthermore, in step 4, when the rough product is cut, the particle size of the hot melt adhesive is controlled to be in the range of 150-250 um.

[0040] Furthermore, in step 4, after re-measuring the final product, the loss ratio of the raw material is calculated, and its mathematical expression is:

[0041]

[0042] Among them, Q is the loss ratio, r is the mass of the re-measured hot melt adhesive, and R is the total mass of the raw materials.

[0043] 3. Beneficial effects

[0044] Compared with the prior art, the advantages of the present invention are:

[0045] In this solution, during the hot melt adhesive production process, polyester polyol, liquid polyurethane, liquid diphenylmethane and tackifying resin are used as raw materials. Under the condition of ensuring the viscosity of the hot melt adhesive, butyl hydroxybenzoate catalyst, polybutadiene adhesive, plasticizer and pure water are added simultaneously for continuous reaction and blending. At the same time, the temperature change and time of production are effectively controlled to ensure that the final produced PUR hot melt adhesive has a higher melting point and better viscosity, so that this PUR hot melt adhesive can better meet the needs of sofa assembly and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0048] Embodiment 1:

[0049] See also Figure 1 , a preparation process of PUR hot melt adhesive for sofa assembly, the specific implementation steps of the preparation process are as follows:

[0050] Step 1: Complete the measurement, storage and pretreatment of raw materials;

[0051] The raw materials of PUR hot melt adhesive are taken, and the raw materials include solid polyester polyol, liquid polyurethane, liquid diphenylmethane and tackifying resin. According to the preparation amount of PUR hot melt adhesive, the required amount of each raw material is calculated respectively, and then each raw material is measured and taken respectively according to the mass ratio;

[0052] The solid polyester polyol is pre-processed by crushing so that the solid polyester polyol is stored in a powder state, and at the same time, the solid polyester polyol, liquid polyurethane, liquid diphenylmethane and tackifying resin are sealed and stored in containers respectively;

[0053] The mass ratio of solid polyester polyol, liquid polyurethane, liquid diphenylmethane and tackifying resin is (285-295): (195-210): (235-250): (120-132);

[0054] Among them, the total mass fractions of solid polyester polyol, liquid polyurethane and liquid diphenylmethane are less than 750.

[0055] Step 2: Complete the mixing, reaction, and filtration of the raw materials, and control the operating conditions:

[0056] Taking a reactor, cleaning, disinfecting, drying and preheating the reactor, and setting a cleaned stirring structure in the reactor;

[0057] When preheating the reactor, the preheating temperature is 123°C;

[0058] After preheating is completed, continue heating to maintain the heating kettle at the preheated temperature, the temperature range is 115℃~128℃.

[0059] Add the measured raw materials in proportion by mass into the reactor, while continuously stirring and controlling the temperature for heating to achieve a complete reaction and form a mixture;

[0060] When adding raw materials to the reactor:

[0061] First, add powdered solid polyester polyol until the powdered solid is completely melted;

[0062] Then, liquid polyurethane, liquid diphenylmethane and tackifying resin are added.

[0063] While continuing to stir, add butylated hydroxybenzoate catalyst, polybutadiene binder, plasticizer and purified water;

[0064] The addition ratio of butyl hydroxybenzoate catalyst, polybutadiene adhesive, plasticizer, pure water and solid polyester polyol is (10-12): (13-25): (21-24): (300-500): (285-295).

[0065] After the raw materials are added to the reactor, heating is performed, the temperature is controlled within the range of 232°C to 248°C, and the duration of heating is controlled to be no less than 3 hours;

[0066] During the heating process, antioxidant is continuously added, and the total weight fraction ratio of the antioxidant is 10 to 12.

[0067] Then the mixture in the reactor is discharged into a cooling container, during which the mixture is filtered and impurities are removed;

[0068] Select 80-mesh or 100-mesh filter for filtering.

[0069] Step 3: Complete the cooling and molding of the mixture to form a rough product:

[0070] Control the temperature of the cooling container during cooling to gradually cool the mixture until the mixture forms a uniform bulk coarse product;

[0071] During cooling, control the cooling temperature, specifically:

[0072] Rapidly lower the temperature to 180°C-195°C and maintain this temperature for 10 minutes;

[0073] Slowly lower the temperature to 80-90°C and maintain this temperature for 30-40 minutes;

[0074] Slowly lower the temperature to room temperature;

[0075] Wait for the rough product to cool and take shape.

[0076] Step 4: Complete the screening and cutting of the rough products to form the final products, and then re-measure and store them:

[0077] Cut the coarse product and remove the unevenly mixed part of the coarse product;

[0078] The remaining parts are divided and the divided products are re-measured and stored according to the amount.

[0079] When cutting the rough products, the particle size of the hot melt adhesive is controlled within the range of 150-250um.

[0080] After re-measuring the final product, the loss ratio of the raw material is calculated, and its mathematical expression is:

[0081]

[0082] Among them, Q is the loss ratio, r is the mass of the re-measured hot melt adhesive, and R is the total mass of the raw materials.

[0083] According to the loss ratio and the demand for hot melt adhesive, the demand for raw materials can be re-determined to reduce the time required for single production of hot melt adhesive and improve production efficiency.

[0084] Embodiment 2:

[0085] When sampling the hot melt adhesive and conducting physical testing, it was found that the melting point of the hot melt adhesive was 150°C and the adhesive force was relatively strong.

[0086] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A preparation process of PUR hot melt adhesive for sofa assembly, characterized in that: The specific implementation steps of the preparation process are as follows: Step 1: Complete the measurement, storage and pretreatment of raw materials; The raw materials of PUR hot melt adhesive are taken, and the raw materials include solid polyester polyol, liquid polyurethane, liquid diphenylmethane and tackifying resin. According to the preparation amount of PUR hot melt adhesive, the required amount of each raw material is calculated respectively, and then each raw material is measured and taken respectively according to the mass ratio; The solid polyester polyol is pre-processed by crushing so that the solid polyester polyol is stored in a powder state, and at the same time, the solid polyester polyol, liquid polyurethane, liquid diphenylmethane and tackifying resin are sealed and stored in containers respectively; Step 2: Complete the mixing, reaction, and filtration of the raw materials, and control the operating conditions: Taking a reactor, cleaning, disinfecting, drying and preheating the reactor, and setting a cleaned stirring structure in the reactor; Add the measured raw materials in proportion by mass into the reactor, while continuously stirring and controlling the temperature for heating to achieve a complete reaction and form a mixture; Then the mixture in the reactor is discharged into a cooling container, during which the mixture is filtered and impurities are removed; Step 3: Complete the cooling and molding of the mixture to form a rough product: Control the temperature of the cooling container during cooling to gradually cool the mixture until the mixture forms a uniform bulk coarse product; Step 4: Complete the screening and cutting of the rough products to form the final products, and then re-measure and store them: Cut the coarse product and remove the unevenly mixed part of the coarse product; The remaining parts are divided and the divided products are re-measured and stored according to the amount.

2. The preparation process of a PUR hot melt adhesive for sofa assembly according to claim 1, characterized in that: In the step 1, the mass ratio of solid polyester polyol, liquid polyurethane, liquid diphenylmethane and tackifying resin is (285-295): (195-210): (235-250): (120-132); Among them, the total mass fractions of solid polyester polyol, liquid polyurethane and liquid diphenylmethane are less than 750.

3. The preparation process of a PUR hot melt adhesive for sofa assembly according to claim 1, characterized in that: In the step 2, when the reactor is preheated, the preheating temperature is 123°C; After preheating is completed, continue heating to maintain the heating kettle at the preheated temperature, the temperature range is 115℃~128℃.

4. The preparation process of a PUR hot melt adhesive for sofa assembly according to claim 1, characterized in that: In the step 2, when adding raw materials to the reactor: First, add powdered solid polyester polyol until the powdered solid is completely melted; Then, liquid polyurethane, liquid diphenylmethane and tackifying resin are added.

5. The preparation process of a PUR hot melt adhesive for sofa assembly according to claim 1, characterized in that: In the step 2, while continuing to stir, adding butylated hydroxybenzoate catalyst, polybutadiene adhesive, plasticizer and pure water; The addition ratio of butyl hydroxybenzoate catalyst, polybutadiene adhesive, plasticizer, pure water and solid polyester polyol is (10-12): (13-25): (21-24): (300-500): (285-295).

6. The preparation process of a PUR hot melt adhesive for sofa assembly according to claim 1, characterized in that: In the step 2, after the raw materials are added to the reactor, heating is performed, the temperature is controlled in the range of 232° C. to 248° C., and the duration of heating is controlled to be not less than 3 hours; During the heating process, antioxidant is continuously added, and the total weight fraction ratio of the antioxidant is 10 to 12.

7. The preparation process of a PUR hot melt adhesive for sofa assembly according to claim 1, characterized in that: In the step 2, a filter screen with 80 mesh or 100 mesh is selected for filtering.

8. The preparation process of a PUR hot melt adhesive for sofa assembly according to claim 1, characterized in that: In the step 3, during cooling, the cooling temperature is controlled, specifically: Rapidly lower the temperature to 180°C-195°C and maintain this temperature for 10 minutes; Slowly lower the temperature to 80-90°C and maintain this temperature for 30-40 minutes; Slowly lower the temperature to room temperature; Wait for the rough product to cool and take shape.

9. The preparation process of a PUR hot melt adhesive for sofa assembly according to claim 1, characterized in that: In the step 4, when the rough product is cut, the particle size of the hot melt adhesive is controlled to be in the range of 150-250 um.

10. The preparation process of a PUR hot melt adhesive for sofa assembly according to claim 1, characterized in that: In the step 4, after re-measuring the final product, the loss ratio of the raw material is calculated, and its mathematical expression is: Among them, Q is the loss ratio, r is the mass of the re-measured hot melt adhesive, and R is the total mass of the raw materials.

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