Method for producing hot-melt pressure-sensitive adhesive by extruder

Abstract

The invention discloses a method for producing a hot-melt pressure-sensitive adhesive by an extruder. The method comprises the following steps: S1, preparing raw materials: combining a high-molecular polymer, a filler, an adhesive, a plasticizer and other additives according to performance; s2, raw material pretreatment: performing necessary drying and filtration on some materials to remove impurities; s3, mixed feeding: putting the pretreated raw materials into a hopper of an extruder, and heating the raw materials when the raw materials enter the extruder; by optimizing the process steps, the production efficiency can be improved, the energy consumption and the raw material consumption can be reduced, and by optimizing the material formula, the performance and the characteristics of the hot-melt pressure-sensitive adhesive can be improved, and the application innovation of the additive and the filler is that the novel additive and the filler are introduced, so that the hot-melt pressure-sensitive adhesive can be endowed with more special performance; the anti-aging capability of the rubber material is improved.

Description

Technical Field

[0001] The invention relates to the technical field of hot melt pressure sensitive adhesives, in particular to a method for producing hot melt pressure sensitive adhesives using an extruder. Background Art

[0002] Hot melt pressure sensitive adhesive is a type of pressure sensitive adhesive, which refers to a type of adhesive that is sensitive to pressure and can be bonded to the adherend with a little pressure from the finger, without the need for solvents or other auxiliary means. Hot melt pressure sensitive adhesive is a new type of adhesive tape made by mixing synthetic rubber, resin and rubber oil, heating them into a molten state, and then coating them on substrates such as paper, cloth or plastic film.

[0003] The existing production method of hot melt pressure sensitive adhesive is generally to produce by extruder. For example, the China Patent Network discloses "a method for producing hot melt pressure sensitive adhesive by twin screw extruder", patent number CN103331891A. This patent has (1) continuous production, high production efficiency, about 2.5 to 3 times the production efficiency of traditional reactors; (2) short production time, the time from adding raw materials to the twin screw extruder to producing hot melt pressure sensitive adhesive products is no more than 5 minutes, and even after cooling and packaging, the time is no more than 0.5 hours; (3) production The performance of the finished adhesive is relatively stable. Due to the short production process, the molecular segments of the polymer adhesive are not easy to break and age, and the product quality is good. However, when producing the hot-melt pressure-sensitive adhesive, the patent does not pre-treat and classify the raw materials, resulting in some raw materials being aggregated and heated before dispersion when the raw materials are dispersed and heated, resulting in reduced performance. In addition, in the current production method, the product quality stability is poor. The viscosity, adhesion and other properties of the hot-melt pressure-sensitive adhesive are crucial to the stability of the product quality. The raw material ratio is often not optimized in the existing technology. Summary of the invention

[0004] The object of the present invention is to provide a method for producing a hot melt pressure-sensitive adhesive by an extruder, which has the advantages of being able to pretreat raw materials and optimize the formula.

[0005] To achieve the above object, the present invention provides the following technical solution: an extruder for producing hot melt pressure sensitive adhesive, comprising the following components:

[0006] High molecular weight polymer 50-70%;

[0007] Filler 20-40%;

[0008] Adhesive 10-20%;

[0009] Plasticizer 1-10%;

[0010] Other additives 1-5%.

[0011] A method for producing a hot melt pressure sensitive adhesive by an extruder comprises the following steps:

[0012] S1 Raw material preparation: Combine polymers, fillers, adhesives, plasticizers and other additives according to their performance;

[0013] S2 Raw material pretreatment: some materials need to be dried and filtered to remove impurities;

[0014] S3 mixed feeding: putting the pretreated raw materials into the hopper of the extruder, wherein the raw materials need to be heated when entering the extruder;

[0015] S4 spiral discharge: by controlling the screw speed and temperature of the extruder, the molten rubber is pushed from the outlet of the extruder to the die head;

[0016] S5 molding: After extrusion, the rubber compound is cooled and solidified by conveyor belts or rollers;

[0017] S6 Cutting: The hot melt adhesive strips or adhesive wires are cut after cooling and solidification, and packaged and encapsulated as needed for subsequent use.

[0018] Preferably, in step S1, the high molecular polymer is one of acrylic resin or vinyl ester resin, the filler is one of silica, calcium carbonate or talc, the adhesive is one of polyamide adhesive or polyvinyl acetate adhesive, the plasticizer is one of phthalate or epoxy oil, and the other additive is one of antioxidant or UV absorber.

[0019] Preferably, in step S1, the high molecular polymer and filler are pre-classified first, and then the adhesive, plasticizer and other additives are pre-classified.

[0020] Preferably, in step S2, after removing impurities, each substance is weighed in proportion.

[0021] Preferably, in step S3, the raw materials are heated and mixed in the barrel of the extruder through the heating and screw rotation to form a molten rubber material.

[0022] Preferably, in step S4, a die head is provided with a die having an aperture and a shape matching the desired product.

[0023] Preferably, in step S5, the shaping operation can also be performed by air cooling or water cooling to make the rubber material more stable and operable.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention can improve production efficiency, reduce energy consumption and raw material consumption by optimizing process steps, and can improve the performance and characteristics of hot melt pressure-sensitive adhesive by optimizing material formula. The application innovation of additives and fillers: the introduction of new additives and fillers can give the hot melt pressure-sensitive adhesive more special properties and improve the anti-aging ability of the adhesive. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Embodiment 1:

[0028] Acrylic resin 50%;

[0029] Silicon dioxide 35%;

[0030] Polyamide adhesive 10%;

[0031] Phthalates 4%;

[0032] Antioxidant 1%.

[0033] A method for producing a hot melt pressure sensitive adhesive using an extruder comprises the following steps:

[0034] S1 Raw material preparation: Combine polymers, fillers, adhesives, plasticizers and other additives according to their performance; pre-classify polymers and fillers first, and then pre-classify adhesives, plasticizers and other additives.

[0035] S2 Raw material pretreatment: some materials need to be dried and filtered to remove impurities;

[0036] S3 mixed feeding: put the pretreated raw materials into the hopper of the extruder, wherein the raw materials need to be heated when entering the extruder; the raw materials are heated and mixed in the barrel of the extruder through heating and screw rotation to form a molten rubber material, and the screw speed is 100 rpm, the heating temperature in the feeding zone is 100°C, and the temperature of the extruder barrel is 100°C.

[0037] S4 spiral discharge: By controlling the screw speed and temperature of the extruder, the molten rubber is pushed from the outlet of the extruder to the die head; the die head is provided with a mold whose aperture and shape match the required product.

[0038] S5 Molding: After extrusion, the rubber compound is cooled and solidified by conveyor belts or rollers; it can also be shaped by air cooling or water cooling to make the rubber compound more stable and workable.

[0039] S6 Cutting: The hot melt adhesive strips or adhesive wires are cut after cooling and solidification, and packaged and encapsulated as needed for subsequent use.

[0040] Embodiment 2:

[0041] Acrylate resin 55%;

[0042] Silicon dioxide 30%;

[0043] Polyamide adhesive 10%;

[0044] Phthalates 4%;

[0045] Antioxidant 1%.

[0046] A method for producing a hot melt pressure sensitive adhesive using an extruder comprises the following steps:

[0047] S1 Raw material preparation: Combine polymers, fillers, adhesives, plasticizers and other additives according to their performance; pre-classify polymers and fillers first, and then pre-classify adhesives, plasticizers and other additives.

[0048] S2 Raw material pretreatment: some materials need to be dried and filtered to remove impurities;

[0049] S3 mixed feeding: put the pretreated raw materials into the hopper of the extruder, wherein the raw materials need to be heated when entering the extruder; the raw materials are heated and mixed in the barrel of the extruder through heating and screw rotation to form a molten rubber material, and the screw speed is 100 rpm, the heating temperature in the feeding zone is 100°C, and the temperature of the extruder barrel is 100°C.

[0050] S4 spiral discharge: By controlling the screw speed and temperature of the extruder, the molten rubber is pushed from the outlet of the extruder to the die head; the die head is provided with a mold whose aperture and shape match the required product.

[0051] S5 Molding: After extrusion, the rubber compound is cooled and solidified by conveyor belts or rollers; it can also be shaped by air cooling or water cooling to make the rubber compound more stable and workable.

[0052] S6 Cutting: The hot melt adhesive strips or adhesive wires are cut after cooling and solidification, and packaged and encapsulated as needed for subsequent use.

[0053] Embodiment three:

[0054] Acrylate resin 60%;

[0055] Silicon dioxide 25%;

[0056] Polyamide adhesive 10%;

[0057] Phthalates 4%;

[0058] Antioxidant 1%.

[0059] A method for producing a hot melt pressure sensitive adhesive using an extruder comprises the following steps:

[0060] S1 Raw material preparation: Combine polymers, fillers, adhesives, plasticizers and other additives according to their performance; pre-classify polymers and fillers first, and then pre-classify adhesives, plasticizers and other additives.

[0061] S2 Raw material pretreatment: some materials need to be dried and filtered to remove impurities;

[0062] S3 mixed feeding: put the pretreated raw materials into the hopper of the extruder, wherein the raw materials need to be heated when entering the extruder; the raw materials are heated and mixed in the barrel of the extruder through heating and screw rotation to form a molten rubber material, and the screw speed is 100 rpm, the heating temperature in the feeding zone is 100°C, and the temperature of the extruder barrel is 100°C.

[0063] S4 spiral discharge: By controlling the screw speed and temperature of the extruder, the molten rubber is pushed from the outlet of the extruder to the die head; the die head is provided with a mold whose aperture and shape match the required product.

[0064] S5 Molding: After extrusion, the rubber compound is cooled and solidified by conveyor belts or rollers; it can also be shaped by air cooling or water cooling to make the rubber compound more stable and workable.

[0065] S6 Cutting: The hot melt adhesive strips or adhesive wires are cut after cooling and solidification, and packaged and encapsulated as needed for subsequent use.

[0066] Embodiment 4:

[0067] Acrylate resin 65%;

[0068] Silicon dioxide 20%;

[0069] Polyamide adhesive 10%;

[0070] Phthalates 4%;

[0071] Antioxidant 1%.

[0072] A method for producing a hot melt pressure sensitive adhesive using an extruder comprises the following steps:

[0073] S1 Raw material preparation: Combine polymers, fillers, adhesives, plasticizers and other additives according to their performance; pre-classify polymers and fillers first, and then pre-classify adhesives, plasticizers and other additives.

[0074] S2 Raw material pretreatment: some materials need to be dried and filtered to remove impurities;

[0075] S3 mixed feeding: put the pretreated raw materials into the hopper of the extruder, wherein the raw materials need to be heated when entering the extruder; the raw materials are heated and mixed in the barrel of the extruder through heating and screw rotation to form a molten rubber material, and the screw speed is 100 rpm, the heating temperature in the feeding zone is 100°C, and the temperature of the extruder barrel is 100°C.

[0076] S4 spiral discharge: By controlling the screw speed and temperature of the extruder, the molten rubber is pushed from the outlet of the extruder to the die head; the die head is provided with a mold whose aperture and shape match the required product.

[0077] S5 Molding: After extrusion, the rubber compound is cooled and solidified by conveyor belts or rollers; it can also be shaped by air cooling or water cooling to make the rubber compound more stable and workable.

[0078] S6 Cutting: The hot melt adhesive strips or adhesive wires are cut after cooling and solidification, and packaged and encapsulated as needed for subsequent use.

[0079] Embodiment five:

[0080] Acrylic resin 50%;

[0081] Silicon dioxide 30%;

[0082] Polyamide adhesive 15%;

[0083] Phthalates 4%;

[0084] Antioxidant 1%.

[0085] A method for producing a hot melt pressure sensitive adhesive using an extruder comprises the following steps:

[0086] S1 Raw material preparation: Combine polymers, fillers, adhesives, plasticizers and other additives according to their performance; pre-classify polymers and fillers first, and then pre-classify adhesives, plasticizers and other additives.

[0087] S2 Raw material pretreatment: some materials need to be dried and filtered to remove impurities;

[0088] S3 mixed feeding: put the pretreated raw materials into the hopper of the extruder, wherein the raw materials need to be heated when entering the extruder; the raw materials are heated and mixed in the barrel of the extruder through heating and screw rotation to form a molten rubber material, and the screw speed is 100 rpm, the heating temperature in the feeding zone is 100°C, and the temperature of the extruder barrel is 100°C.

[0089] S4 spiral discharge: By controlling the screw speed and temperature of the extruder, the molten rubber is pushed from the outlet of the extruder to the die head; the die head is provided with a mold whose aperture and shape match the required product.

[0090] S5 Molding: After extrusion, the rubber compound is cooled and solidified by conveyor belts or rollers; it can also be shaped by air cooling or water cooling to make the rubber compound more stable and workable.

[0091] S6 Cutting: The hot melt adhesive strips or adhesive wires are cut after cooling and solidification, and packaged and encapsulated as needed for subsequent use.

[0092] Embodiment six:

[0093] Acrylic resin 50%;

[0094] Silicon dioxide 25%;

[0095] Polyamide adhesive 20%;

[0096] Phthalates 4%;

[0097] Antioxidant 1%.

[0098] A method for producing a hot melt pressure sensitive adhesive using an extruder comprises the following steps:

[0099] S1 Raw material preparation: Combine polymers, fillers, adhesives, plasticizers and other additives according to their performance; pre-classify polymers and fillers first, and then pre-classify adhesives, plasticizers and other additives.

[0100] S2 Raw material pretreatment: some materials need to be dried and filtered to remove impurities;

[0101] S3 mixed feeding: put the pretreated raw materials into the hopper of the extruder, wherein the raw materials need to be heated when entering the extruder; the raw materials are heated and mixed in the barrel of the extruder through heating and screw rotation to form a molten rubber material, and the screw speed is 100 rpm, the heating temperature in the feeding zone is 100°C, and the temperature of the extruder barrel is 100°C.

[0102] S4 spiral discharge: By controlling the screw speed and temperature of the extruder, the molten rubber is pushed from the outlet of the extruder to the die head; the die head is provided with a mold whose aperture and shape match the required product.

[0103] S5 Molding: After extrusion, the rubber compound is cooled and solidified by conveyor belts or rollers; it can also be shaped by air cooling or water cooling to make the rubber compound more stable and workable.

[0104] S6 Cutting: The hot melt adhesive strips or adhesive wires are cut after cooling and solidification, and packaged and encapsulated as needed for subsequent use.

[0105] Embodiment seven:

[0106] Acrylate resin 55%;

[0107] Silicon dioxide 25%;

[0108] Polyamide adhesive 15%;

[0109] Phthalates 4%;

[0110] Antioxidant 1%.

[0111] A method for producing a hot melt pressure sensitive adhesive using an extruder comprises the following steps:

[0112] S1 Raw material preparation: Combine polymers, fillers, adhesives, plasticizers and other additives according to their performance; pre-classify polymers and fillers first, and then pre-classify adhesives, plasticizers and other additives.

[0113] S2 Raw material pretreatment: some materials need to be dried and filtered to remove impurities;

[0114] S3 mixed feeding: put the pretreated raw materials into the hopper of the extruder, wherein the raw materials need to be heated when entering the extruder; the raw materials are heated and mixed in the barrel of the extruder through heating and screw rotation to form a molten rubber material, and the screw speed is 100 rpm, the heating temperature in the feeding zone is 100°C, and the temperature of the extruder barrel is 100°C.

[0115] S4 spiral discharge: By controlling the screw speed and temperature of the extruder, the molten rubber is pushed from the outlet of the extruder to the die head; the die head is provided with a mold whose aperture and shape match the required product.

[0116] S5 Molding: After extrusion, the rubber compound is cooled and solidified by conveyor belts or rollers; it can also be shaped by air cooling or water cooling to make the rubber compound more stable and workable.

[0117] S6 Cutting: The hot melt adhesive strips or adhesive wires are cut after cooling and solidification, and packaged and encapsulated as needed for subsequent use.

[0118] Comparative Examples 1-8 and Blank Experiment Group

[0119] For the hot melt pressure sensitive adhesives prepared in Comparative Examples 1-8 and the blank experimental group and Example 3, only the temperature of the extruder barrel was adjusted.

[0120] Specific

[0121] In Comparative Example 1, after the raw materials enter the barrel through the feeding zone, the heating temperature of the barrel is 80° C. and the heating time is 1 hour.

[0122] In Comparative Example 2, after the raw materials enter the barrel through the feeding zone, the heating temperature of the barrel is 90° C. and the heating time is 1 hour.

[0123] In Comparative Example 3, after the raw materials enter the barrel through the feeding zone, the heating temperature of the barrel is 110° C. and the heating time is 1 hour.

[0124] In Comparative Example 4, after the raw materials enter the barrel through the feeding zone, the heating temperature of the barrel is 120° C. and the heating time is 1 hour.

[0125] In Comparative Example 5, after the raw materials enter the barrel through the feeding zone, the heating temperature of the barrel is 130° C. and the heating time is 1 hour.

[0126] In Comparative Example 6, after the raw materials enter the barrel through the feeding zone, the heating temperature of the barrel is 140° C. and the heating time is 1 hour.

[0127] In Comparative Example 7, after the raw materials enter the barrel through the feeding zone, the heating temperature of the barrel is 150° C. and the heating time is 1 hour.

[0128] In Comparative Example 8, after the raw materials enter the barrel through the feeding zone, the heating temperature of the barrel is 160° C. and the heating time is 1 hour.

[0129] In the blank experimental group, after the raw materials entered the cylinder through the feeding area, the heating temperature of the cylinder was 30°C and the heating time was 1h.

[0130] Viscosity test:

[0131] Here are the steps:

[0132] The hot melt adhesive samples prepared in Comparative Examples 1-8, Example 3 and the blank experimental group were placed in a viscometer.

[0133] Start the test and record the viscosity value of each sample.

[0134] Bond strength test:

[0135] step:

[0136] Prepare multiple specimens and make sure they are clean and flat.

[0137] Apply a certain amount of hot melt adhesive on a test specimen.

[0138] The other multiple samples were closely contacted with the samples coated with the hot melt adhesive of Comparative Examples 1-8, the blank experimental group and Example 3, and a certain pressure was applied.

[0139] Allow the bonded samples to cure for the specified time.

[0140] Use a tensile testing machine to test the bond strength and record the test results.

[0141] Thermal stability test:

[0142] step:

[0143] Prepare hot melt adhesive samples.

[0144] The samples prepared in Comparative Examples 1-8, the blank experimental group and Example 3 were placed in a constant temperature box.

[0145] Observe the appearance changes of the samples, such as color, shape, etc., at 1-h time intervals.

[0146] Aging resistance test:

[0147] step:

[0148] The samples prepared in Comparative Examples 1-8, the blank experimental group and Example 3 were placed under oxidation, ultraviolet or other aging conditions to simulate the actual use environment, and the viscosity and bonding strength were tested again for comparison.

[0149] The test results are as follows:

[0150]

[0151]

[0152] In summary, the method for producing hot melt pressure-sensitive adhesive by an extruder provided by the technical solution has good thermal stability and aging resistance, and performs well in terms of viscosity and bonding strength.

[0153] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0154] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An extruder for producing a hot melt pressure sensitive adhesive, characterized in that: Includes the following components: High molecular weight polymer 50-70%; Filler 20-40%; Adhesive 10-20%; Plasticizer 1-10%; Other additives 1-5%.

2. A method for producing a hot melt pressure sensitive adhesive by an extruder, characterized in that: The following steps are involved: S1 Raw material preparation: Combine polymers, fillers, adhesives, plasticizers and other additives according to their performance; S2 Raw material pretreatment: some materials need to be dried and filtered to remove impurities; S3 mixed feeding: putting the pretreated raw materials into the hopper of the extruder, wherein the raw materials need to be heated when entering the extruder; S4 spiral discharge: by controlling the screw speed and temperature of the extruder, the molten rubber is pushed from the outlet of the extruder to the die head; S5 molding: After extrusion, the rubber compound is cooled and solidified by conveyor belts or rollers; S6 Cutting: The hot melt adhesive strips or adhesive wires are cut after cooling and solidification, and packaged and encapsulated as needed for subsequent use.

3. The method for producing a hot melt pressure sensitive adhesive by an extruder according to claim 2, characterized in that: In step S1, the high molecular polymer is one of acrylic resin or vinyl ester resin, the filler is one of silica, calcium carbonate or talc, the adhesive is one of polyamide adhesive or polyvinyl acetate adhesive, the plasticizer is one of phthalate or epoxy grease, and the other additives are one of antioxidants or ultraviolet absorbers.

4. The method for producing a hot melt pressure sensitive adhesive by an extruder according to claim 2, characterized in that: In the step S1, the high molecular polymer and filler are firstly pre-classified, and then the adhesive, plasticizer and other additives are pre-classified.

5. The method for producing a hot melt pressure sensitive adhesive by an extruder according to claim 2, characterized in that: In the step S2, after removing impurities, each substance is weighed in proportion.

6. The method for producing a hot melt pressure sensitive adhesive by an extruder according to claim 2, characterized in that: In the step S3, the extruder is heated and mixed in the barrel by the action of heating and screw rotation to form a molten rubber material.

7. The method for producing a hot melt pressure sensitive adhesive by an extruder according to claim 2, characterized in that: In step S4, a die having a hole diameter and a shape matching the desired product is provided on the die head.

8. The method for producing a hot melt pressure sensitive adhesive by an extruder according to claim 2, characterized in that: In step S5, the shaping operation can also be performed by air cooling or water cooling to make the rubber material more stable and operable.

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