CN113621325B - Flame-retardant hot melt adhesive and preparation method thereof - Google Patents
Flame-retardant hot melt adhesive and preparation method thereof Download PDFInfo
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- CN113621325B CN113621325B CN202110908952.3A CN202110908952A CN113621325B CN 113621325 B CN113621325 B CN 113621325B CN 202110908952 A CN202110908952 A CN 202110908952A CN 113621325 B CN113621325 B CN 113621325B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
- C09J123/04—Homopolymers or copolymers of ethene
- C09J123/08—Copolymers of ethene
- C09J123/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C09J123/0853—Vinylacetate
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
Abstract
The invention discloses a flame-retardant hot melt adhesive which comprises the following components in percentage by mass: 20 to 50 percent of thermoplastic elastomer, 20 to 50 percent of tackifying resin, 8 to 27 percent of flame retardant master batch, 10 to 30 percent of synthetic wax and 1 to 5 percent of antioxidant; the flame retardant master batch comprises a nitrogen-phosphorus flame retardant and an EVA carrier. According to the invention, through designing raw materials and proportioning, a specific flame retardant master batch is selected to replace general flame retardant powder, so that the compatibility with a hot melt adhesive formula is better, and the problem of nonuniform dispersion of the flame retardant is avoided. The invention discloses a preparation method of a flame-retardant hot melt adhesive, which comprises the steps of uniformly mixing tackifying resin and flame retardant master batches, then adding a thermoplastic elastomer and synthetic wax for mixing, further improving the dispersion effect of the flame retardant master batches, and ensuring that the flame retardant property of the hot melt adhesive meets corresponding requirements while the original property is maintained.
Description
Technical Field
The invention relates to the technical field of preparation of hot melt adhesives, and particularly relates to a flame-retardant hot melt adhesive and a preparation method thereof.
Background
At present, in the field of animal husbandry, in order to effectively block the infection risk of bacteria and viruses and air pollution to the raised animals, mainstream companies actively push air filtering devices to reduce the risk and ensure the survival rate of the raised animals.
Among the air filter equipment, can adopt the hot melt adhesive to bond filtering material fixedly, filtering material generally comprises organic synthesis class material, like PP, glass fiber etc. and these materials most all do not possess flame retardant property, generally appear the fire incident, can't play fire-retardant effect, and then can't effectively reduce the conflagration risk.
The existing solution is to add a fire retardant into the hot melt adhesive to make the hot melt adhesive have a certain flame retardant effect. The fire retardant mainly has two forms of liquid fire retardant and solid fire retardant. The existing liquid flame retardant product system has poor flame retardant effect, is accompanied with pungent smell, and is easy to generate a large amount of bubbles when being heated at high temperature; secondly, after more liquid flame retardants are added, the physical properties of the hot melt adhesive are obviously changed, for example, the tensile strength is reduced, the bonding and peeling effects on materials are poor, in addition, the problem of easy aging exists, and the thermal stability is poor. The problems existing in the liquid flame retardant are difficult to overcome at present, so that the solid flame retardant is usually selected to prepare the flame-retardant hot melt adhesive, and the solid flame retardant is generally powdery. The existing process for preparing the flame-retardant hot melt adhesive is mainly characterized in that materials of a flame retardant and an original formula of the hot melt adhesive are simultaneously put into a reaction kettle, a molten mixture is formed through heating and stirring, and then the molten mixture is filtered by a filter screen and extruded, cooled and dried to obtain the hot melt adhesive. The existing process adopts a mode of simultaneously feeding and mixing all raw materials, so that the flame retardant powder is very difficult to stir and disperse. In order to enable the flame retardant effect to meet the requirement of flame retardant rating UL-94V1-V0, a certain amount of flame retardant powder is often required to be added, because the compatibility of the flame retardant powder and the formula of the hot melt adhesive is poor, and because the flame retardant powder is not easy to disperse uniformly and not fully dispersed, the flame retardant powder is easy to be wrapped and agglomerated to form particles, the performance of the prepared hot melt adhesive is affected, the flame retardant rating cannot meet the requirement, and the mechanical properties such as the adhesive property, the tensile strength, the elongation at break and the like of the hot melt adhesive are also reduced. Although the requirement of flame retardant grade can be achieved by increasing the proportion of the flame retardant, the higher the proportion of the flame retardant is, the less the flame retardant is easy to disperse, the performance of the hot melt adhesive is further influenced, and some of the flame retardant cannot even meet the most basic bonding performance requirement of the hot melt adhesive. In addition, because the fire retardant is difficult to stir the dispersion, on the one hand need extra extension churning time, and on the other hand, when filtering, some great particulate matters block up the filter screen, has also reduced filtration efficiency, has increased the filter time, leads to whole production time extension, and production efficiency is not high. How to solve the problem of insufficient and uneven dispersion of the solid-state flame retardant, the original performance of the hot melt adhesive is well kept on the premise of meeting the flame retardant grade, and the hot melt adhesive does not block a filter screen and needs to be researched.
Disclosure of Invention
Aiming at the technical problems in the prior art, one of the purposes of the invention is to provide a flame-retardant hot melt adhesive which is prepared from certain raw materials and proportions, the flame retardant is uniformly dispersed, the flame-retardant performance meets the requirement, and the original performance of the hot melt adhesive is considered.
In order to achieve the above purpose, the invention provides the following technical scheme:
the flame-retardant hot melt adhesive comprises the following components in percentage by mass:
the flame retardant master batch comprises a nitrogen-phosphorus flame retardant and an EVA carrier.
In some embodiments, the EVA carrier has a melt index of 150 to 400, a va acetic acid content of 20 to 33%; the mass ratio of the EVA carrier in the flame retardant master batch is not more than 40%, and the flame retardant master batch has fluidity at the high temperature of 150 ℃ or above.
In some embodiments, the thermoplastic elastomer is at least one of ethylene vinyl acetate, ethylene propylene copolymer, ethylene octene copolymer, amorphous alpha-olefin copolymer, ethylene propylene diene copolymer.
In some embodiments, the tackifying resin is at least one of a primary rosin resin, a rosin glycerol ester, a hydrogenated rosin resin, a carbon nine petroleum resin, a hydrogenated carbon nine petroleum resin, a carbon five resin, a hydrogenated DCPD, a carbon five carbon nine copolymerized resin. Preferably, the tackifying resin is low-viscosity resin, the viscosity value is less than or equal to 1500cps at 150 ℃, and the softening point is less than or equal to 105 ℃.
In some embodiments, the nitrogen-phosphorus flame retardant is at least one of a melamine nitrogen-phosphorus flame retardant, a halogen-free high-nitrogen flame retardant, an ammonium polyphosphate flame retardant, and a halogen-free high-nitrogen-phosphorus composite flame retardant.
In some embodiments, the synthetic wax is at least one of a polyethylene wax, an EVA wax, an oxidized polyethylene wax, a fischer-tropsch wax. Specifically, the polyethylene waxes include, but are not limited to, H1, HM105 of saso; the oxidized polyethylene wax includes but is not limited to HONEYWELL A-C6A, A-C629A, AC307A and the like; the Fischer-Tropsch waxes include, but are not limited to, shell SX105, SX80, SX90, japanese refined waxes FT115, FT105, and the like; such EVA waxes include, but are not limited to, bassfulwax EVA3, honeywell AC400, and the like.
In some embodiments, the antioxidant is at least one selected from antioxidant 1010 of basf and antioxidant 2112 of taiwan double bond, preferably, the two are mixed in a mass ratio of 1: 2.
The second purpose of the present invention is to provide a preparation method of the flame retardant hot melt adhesive according to any one of the above embodiments, which comprises the following steps:
s1, weighing materials according to a mass ratio;
s2, adding tackifying resin and an antioxidant into a reaction kettle, heating to 150-155 ℃, and uniformly melting all the tackifying resin;
s3, adding the flame retardant master batch into a reaction kettle, heating to 160-165 ℃, stirring at a high speed, and rapidly and uniformly dispersing the flame retardant master batch and the tackifying resin;
s4, adding the residual materials into a reaction kettle, cooling to 150-155 ℃, completely melting the materials, and uniformly mixing;
and S5, vacuumizing, filtering and extruding the uniformly mixed materials, and cooling and drying to obtain the flame-retardant hot melt adhesive.
According to the preparation method, after the hot melt adhesive is extruded, the flame-retardant hot melt adhesive can be made into shapes including but not limited to granules, strips and the like according to actual requirements, so that the preparation method is convenient for practical application.
In some embodiments, in step S2, the tackifying resin and the antioxidant are added into the reaction kettle, and then stirred at a speed of 30-60 rpm for 30-60min, so that the tackifying resin is completely and uniformly melted.
In some embodiments, in step S3, after the flame retardant master batch is added, the mixture is stirred at a high speed of 90 to 120 rpm for 30 to 60 minutes to uniformly disperse the flame retardant master batch.
In some embodiments, in step S4, after cooling, the rotation speed is adjusted to 50-80 rpm, and stirring is performed for 50-80min, so that the materials are fully and uniformly mixed.
In some implementation methods, in the step S5, vacuum pumping is carried out for 30-60min, the vacuum degree is kept at 0.05-0.08MPa, and then filtering is carried out.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, through improvement of raw materials, proportion and a preparation method, the flame retardant of the flame-retardant hot melt adhesive is fully and uniformly dispersed, the proportion of the flame retardant is effectively reduced on the premise that the flame-retardant grade can be reached, the prepared hot melt adhesive well keeps the original performance, the problem of filter screen blockage in the production process is effectively solved, and the production efficiency is improved.
In terms of raw materials and proportion, specific flame retardant master batches are selected to replace general flame retardant powder, and the flame retardant is compatible with a hot melt adhesive formula, is not easy to agglomerate, is uniformly dispersed, meets the requirement of flame retardant grade, well keeps the original performance of the hot melt adhesive, is not easy to block a filter screen in the production process of the hot melt adhesive, and obviously improves the production efficiency.
In the preparation method, firstly, tackifying resin is mixed with an antioxidant, and the problem that the tackifying resin is easy to age in the heating process is solved by utilizing the characteristics of the antioxidant; after the tackifying resin and the antioxidant are uniformly mixed, the flame retardant master batch is added, and the low viscosity characteristic of the tackifying resin compared with that of the thermoplastic elastomer is utilized, so that the flame retardant master batch can be better dissolved in the tackifying resin, and can be dispersed more uniformly. Through the key steps of the two steps, the flame retardant master batch is fully dispersed, and finally, the thermoplastic elastomer and the synthetic wax are added, so that the dispersion effect of the flame retardant master batch is further improved and the flame retardant effect is better ensured through process improvement.
The method has simple preparation process and is suitable for industrial production.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following examples, the materials used are all commercially available, among them:
the thermoplastic elastomer is selected from the group consisting of EVA of taiwan polymeric chemistry, type: 653. 638, 649, 612, 947; EVA to exxon meifu, type: 7711. 7720, 7510; ethylene octene copolymer of dow chemical type: GA1950, GA1900, 8402, 8407, amorphous α -olefin copolymer of winning chemistry, type: 750. 730, E1060PL-1. Thermoplastic elastomer, can choose one of the above or mixture of two or more; preferably, 638, 653 and 649 of taiwan polymeric chemistry are adopted, and the mass ratio is 1:3:2.
the tackifying resin is selected from hydrogenated carbon five resin produced by Shandong Luhua chemical engineering Limited, hydrogenated DCPD resin of Exxon Mobil, and hydrogenated carbon nine resin of Taiwan Heyi; preferably, the hydrogenated DCPD resin selected from exxonmobil and hydrogenated carbon nine resin selected from taiwan synergic, the mass ratio is 2:3. the resins are low-viscosity resins, and have a viscosity value of less than or equal to 1500cps and a softening point of less than or equal to 105 ℃ at 150 ℃.
The flame retardant master batch consists of an EVA carrier and a nitrogen-phosphorus flame retardant, wherein in the flame retardant master batch, the EVA carrier has a melt index of 150-400, the VA acetic acid content of 20-33 percent, the mass ratio of the EVA carrier is not more than 40 percent, and the flame retardant master batch has fluidity at the high temperature of 150 ℃ or above. The preferred halogen-free nitrogen-phosphorus flame retardant master batch is selected from flame retardant master batch HPM055 of HiBlai company and flame retardant master batch PFR-40 of Chenghmacrocarpish chemical company. For comparison, the alternative to use the powdered halogen-free flame retardant is the clainn halogen-free flame retardant OP1312.
Synthetic wax, polyethylene wax selected from H1, HM105 of Sasol; the oxidized polyethylene wax is selected from A-C6A, A-C629A and AC307A of HONEYWELL; the Fischer-Tropsch wax is selected from shell-brand SX105, SX80, SX90, japanese refined wax FT115, FT105; the EVA wax is Pasteur LUWAX EVA3 and Honeywell AC400; the synthetic wax may be one or a mixture of two or more of the above.
The antioxidant is at least one selected from antioxidant 1010 of basf and antioxidant 2112 of taiwan double bond, preferably, the two are mixed according to the mass ratio of 1: 2.
For comparison, the formula of the invention and other formulas are prepared into different hot melt adhesives according to the preparation method of the invention and the conventional preparation method respectively. The specific raw material types, amounts and preparation methods are shown in Table 1
TABLE 1 kinds and amounts of raw materials of examples 1 to 6, comparative examples 1 to 6, and reference examples, and corresponding production methods
The hot melt adhesives of examples 1-3 and comparative examples 4-6 were prepared according to the method of the present invention, as follows:
the method A comprises the following steps: the preparation method of the flame-retardant hot melt adhesive comprises the following steps:
s1, weighing materials according to a mass ratio;
s2, adding tackifying resin and an antioxidant into a reaction kettle, heating to 155 ℃, stirring at the speed of 60 revolutions per minute for 30min, and uniformly melting all the tackifying resin;
s3, adding the flame retardant master batch into a reaction kettle, heating to 160 ℃, stirring at a high speed of 90 r/min for 60min, and rapidly and uniformly dispersing the flame retardant master batch and tackifying resin;
s4, adding the rest materials into a reaction kettle, cooling to 150 ℃, adjusting the rotating speed to 50 revolutions per minute, stirring for 80 minutes to completely melt the materials, and uniformly mixing;
and S5, vacuumizing for 30min, keeping the vacuum degree at 0.08MPa, filtering the uniformly mixed materials, extruding for granulation, cooling and drying to obtain the flame-retardant hot melt adhesive.
The hot melt adhesives of examples 4 to 6, comparative examples 1 to 3 and reference examples were prepared according to the conventional method, specifically as follows:
the method B comprises the following steps: a preparation method of the hot melt adhesive comprises the following steps:
s1, weighing materials according to a mass ratio;
s2, adding the thermoplastic elastomer and the synthetic wax into a reaction kettle, heating to 150 ℃, and stirring at the speed of 30 revolutions per minute for 60min;
s3, adding the rest materials into a reaction kettle, stirring at the speed of 50 revolutions per minute for 150 minutes to completely melt the materials, and uniformly mixing;
and S5, vacuumizing for 30min, keeping the vacuum degree at 0.08MPa, filtering the uniformly mixed materials, extruding for granulation, cooling and drying to obtain the flame-retardant hot melt adhesive.
The hot melt adhesives prepared in the examples 1-6, the comparative examples 1-6 and the reference examples are subjected to related performance detection, and the detection method comprises the following steps:
1. viscosity measurement
The viscosity was measured using a CAP2000 viscometer (spindle 4) from Bohler aircraft, USA, according to the GB/T2794 specification, and the results were reported in centipoise (cps). The Cps/150 ℃ represents a viscosity value at 150 ℃, in the air filter material industry, the operating temperature is generally 130-160 ℃, the viscosity is not too high or too low, the equipment is difficult to glue when the viscosity is too high, the viscosity is too low, and the flowing is easy when the fluidity is too good. It is therefore common to control the viscosity at 4000-9000 cps/150 ℃.
2. UL-94 flame retardant Performance test
The UL-94 flame retardant performance test adopts a method of a U.S. flame retardant material standard UL94 vertical combustion test, the size of a test piece is 130mm (length) multiplied by 20mm (width) multiplied by 2mm (thickness), and the thickness of the test piece cannot exceed 2mm. The flame retardant grade is gradually increased from HB, V-2 and V-1 to V-0; wherein:
v-0: after the sample is subjected to a burning test for 10 seconds, the cotton cannot be ignited by the droppings, the flame is extinguished within 30 seconds, and no comburent falls;
v-1: after the sample is subjected to a combustion test for 10 seconds, the cotton cannot be ignited by the droppings, the flame is extinguished within 60 seconds, and no comburent falls;
v-2: after two 10 second burn tests on the samples, the flame extinguished within 60 seconds and there was a burn drop.
3. High temperature filtration test
Fixing a 120-mesh stainless steel filter screen on an aluminum foil disc, placing 200g of hot melt adhesive on the filter screen, placing the filter screen in a 150 ℃ oven, continuously heating for 4h, and observing the conditions of residual impurities and flame retardant particles on the surface of the filter screen.
4. Test for adhesive Effect
300g of hot melt adhesive is taken and put into a 500ml glass beaker, and is placed in a drying oven at 150 ℃, and when the hot melt adhesive is fully melted, the actual measurement temperature of the hot melt adhesive is 150 +/-2 ℃ by a mercury thermometer; a plurality of strips of 10cm × 3cm glass fiber material were prepared.
And (3) spraying the hot melt adhesive liquid on the glass fiber material (the length and the width of the hot melt adhesive are =30mm and 2mm), laminating the glass fiber material with another glass fiber material within 15s of opening time, cooling for 2h, then carrying out a stripping test, and observing whether the surface damage of the material can be achieved. The larger the material failure area, the better the bonding effect. The material damage area reaches at least 60 percent, and the material basically reaches the standard.
5. Tensile Strength and elongation at Break test
According to the determination of the tensile stress strain performance of national standard GBT528-2009 vulcanized rubber or thermoplastic rubber, a standard dumbbell-shaped sample is manufactured, and the change of the mechanical strength of the hot melt adhesive is compared through testing. The higher the tensile strength of the hot melt adhesive, the greater the elongation represents the better toughness of the hot melt adhesive. If the tensile strength is higher and the elongation is lower, the hot melt adhesive is more brittle, and the risk of adhesive breaking is more likely to occur in the aspect of application.
The results of the performance tests of examples 1 to 6, comparative examples 1 to 6 and reference examples are shown in Table 2.
TABLE 2 results of various property tests of examples 1 to 6, comparative examples 1 to 6 and reference examples
As shown in Table 2, the flame retardant master batch is used in the hot melt adhesive provided by the invention, so that the flame retardant dispersion effect is good, and the preparation method provided by the invention is matched, so that the dispersion effect of the flame retardant is better, and the impurities are few or even no impurities are generated after high-temperature filtration. The flame retardant grade is met, and the performance of the hot-melt adhesive is also well considered.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
While the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The flame-retardant hot melt adhesive is characterized by comprising the following components in percentage by mass:
20 to 50 percent of thermoplastic elastomer
20 to 50 percent of tackifying resin
8 to 27 percent of flame retardant master batch
10 to 30 percent of synthetic wax
1 to 5 percent of antioxidant;
wherein the flame retardant master batch comprises a nitrogen-phosphorus flame retardant and an EVA carrier;
the EVA carrier has a melt index of 150-400 and a VA content of 20-33%; the mass ratio of the EVA carrier in the flame retardant master batch is not more than 40%, and the EVA carrier has fluidity at the high temperature of 150 ℃ or above; the nitrogen-phosphorus flame retardant is at least one of melamine nitrogen-phosphorus flame retardant, ammonium polyphosphate flame retardant and halogen-free high nitrogen-phosphorus composite flame retardant;
the tackifying resin is at least one of primary rosin resin, rosin glyceride, hydrogenated rosin resin, carbon nine petroleum resin, hydrogenated carbon nine petroleum resin, carbon five resin, hydrogenated DCPD and carbon five carbon nine copolymerized resin;
the synthetic wax is at least one of polyethylene wax, EVA wax, oxidized polyethylene wax and Fischer-Tropsch wax;
the preparation method of the flame-retardant hot melt adhesive comprises the following steps:
s1, weighing materials according to a mass ratio;
s2, adding the tackifying resin and an antioxidant into a reaction kettle, heating to 150-155 ℃, and uniformly melting the tackifying resin;
s3, adding the flame retardant master batch into a reaction kettle, heating to 160-165 ℃, stirring at a high speed, and rapidly and uniformly dispersing the flame retardant master batch and the tackifying resin;
s4, adding the residual materials into the reaction kettle, cooling to 150-155 ℃, completely melting the materials, and uniformly mixing;
and S5, vacuumizing, filtering and extruding the uniformly mixed materials, and cooling and drying to obtain the flame-retardant hot melt adhesive.
2. The flame-retardant hot melt adhesive according to claim 1, wherein the thermoplastic elastomer is at least one of ethylene vinyl acetate, ethylene propylene copolymer, ethylene octene copolymer, amorphous α -olefin copolymer, and ethylene propylene diene copolymer.
3. The preparation method of the flame-retardant hot melt adhesive according to any one of claims 1 to 2, characterized by comprising the following steps:
s1, weighing materials according to a mass ratio;
s2, adding the tackifying resin and an antioxidant into a reaction kettle, heating to 150-155 ℃, and uniformly melting the tackifying resin;
s3, adding the flame retardant master batch into a reaction kettle, heating to 160-165 ℃, stirring at a high speed, and rapidly and uniformly dispersing the flame retardant master batch and tackifying resin;
s4, adding the residual materials into a reaction kettle, cooling to 150 to 155 ℃, completely melting the materials, and uniformly mixing;
s5, vacuumizing, filtering and extruding the uniformly mixed materials, and cooling and drying to obtain the flame-retardant hot melt adhesive.
4. The preparation method of the flame-retardant hot melt adhesive according to claim 3, wherein in the step S2, after the tackifying resin and the antioxidant are added into the reaction kettle, the mixture is stirred for 30 to 60min at a speed of 30 to 60 rpm, and the tackifying resin is completely and uniformly melted.
5. The preparation method of the flame-retardant hot melt adhesive according to claim 3, wherein in the step S3, the flame retardant master batch is added, and then the mixture is stirred at a high speed of 90 to 120 rpm for 30 to 60min to uniformly disperse the flame retardant master batch.
6. The preparation method of the flame-retardant hot melt adhesive according to claim 3, wherein in the step S4, after cooling, the rotation speed is adjusted to 50 to 80 rpm, and the mixture is stirred for 50 to 80min, so that the materials are fully and uniformly mixed.
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