CN113388348B - High-performance left-right-sticking hot melt adhesive and preparation method thereof - Google Patents
High-performance left-right-sticking hot melt adhesive and preparation method thereof Download PDFInfo
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- CN113388348B CN113388348B CN202110742215.0A CN202110742215A CN113388348B CN 113388348 B CN113388348 B CN 113388348B CN 202110742215 A CN202110742215 A CN 202110742215A CN 113388348 B CN113388348 B CN 113388348B
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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
- C09J157/00—Adhesives based on unspecified polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C09J157/02—Copolymers of mineral oil hydrocarbons
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention discloses a high-performance left-right hot melt adhesive and a preparation method thereof, wherein the high-performance left-right hot melt adhesive comprises the following components in percentage by mass: 15-35% of polymer, 3-10% of styrene-butadiene rubber, 10-25% of plasticizer, 25-55% of tackifying resin, 0.1-2% of antioxidant and 1-5% of poly alpha-methyl styrene resin; the sum of the mass percentages of the components is 100 percent; the high-performance left and right hot melt adhesive prepared by the invention realizes excellent mechanical properties through the styrene-butadiene rubber and the fully hydrogenated petroleum resin, so that the left and right hot melt adhesive has excellent initial adhesion and peeling force, and can resist high temperature by adding SEBS or SBS or SIS with high tensile strength and matching with poly alpha-methyl styrene resin, and has excellent adhesion holding performance and good thermal stability; the hot melt adhesive is applied to the fields of magic buckles, PP sticks, sticking buckles and the like of paper diapers, and the left and right sticks can realize the function of repeatedly sticking.
Description
Technical Field
The invention relates to the field of hot melt adhesive application, in particular to a high-performance left-right adhesive hot melt adhesive and a preparation method thereof.
Background
The hot melt adhesive is a plastic adhesive, and belongs to an environment-friendly chemical product. Along with the economic development, the living standard of people is also continuously improved, the population using disposable paper diapers such as babies' paper diapers and even adult paper diapers is more and more increased, the range is wider and more extensive, and the requirements on the disposable paper diapers are higher and more. Therefore, the disposable diaper is also continuously improved in product quality in order to meet the market development requirement, and the paper diaper is generally provided with a left-right adhesive structure to realize the adhesion of the two ends of the paper diaper; the left and right sticks are formed by combining structures such as magic buckles.
At present, rosin resin is adopted for sticking hot melt adhesive on the market more and more, so that the smell is heavy, and the use experience of consumers is affected; and the structures such as the magic buckle and the like are generally smooth in surface, so that repeated and effective adhesion is difficult to form; with the increasing of the population aging degree of society, the market demand of adult paper diapers is increasing, and because the manufacturing cost of adult paper diapers is higher, the problem can be solved by replacing a core body, and the function of repeatedly pasting the hot melt adhesive is required to be realized.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the purposes of the invention is to provide a high-performance left-right hot melt adhesive, which can be applied to the fields of paper diaper magic buckles, paper diaper PP (polypropylene) patches, sticking belts and the like, has excellent mechanical properties, can realize the function of repeatedly sticking in paper diapers, meets the requirement of recycling the replacement core body of the paper diapers, improves the environmental protection performance and has good economic benefit.
The second purpose of the invention is to provide a preparation method of the high-performance left-right adhesive hot melt adhesive.
One of the purposes of the invention is realized by adopting the following technical scheme:
a high-performance left-right adhesive hot melt adhesive comprises the following components in percentage by mass: 15-35% of polymer, 3-10% of styrene-butadiene rubber, 10-25% of plasticizer, 25-55% of tackifying resin, 0.1-2% of antioxidant and 1-5% of poly alpha-methyl styrene resin; the sum of the mass percentages of the components is 100 percent.
As a further explanation of the scheme, the high-performance left-right adhesive hot melt adhesive comprises the following components in percentage by mass: 20-35% of polymer, 3-10% of styrene-butadiene rubber, 10-20% of plasticizer, 40-55% of tackifying resin, 0.1-1% of antioxidant and 1-5% of poly alpha-methyl styrene resin; the sum of the mass percentages of the components is 100 percent.
As a further explanation of the scheme, the high-performance left-right adhesive hot melt adhesive comprises the following components in percentage by mass: 22-35% of polymer, 3-10% of styrene-butadiene rubber, 10-20% of plasticizer, 44-50% of tackifying resin, 0.1-0.8% of antioxidant and 1-5% of poly alpha-methyl styrene resin; the sum of the mass percentages of the components is 100 percent.
As a further illustration of the above, the polymer is one or a mixture of two or more of star SIS, SBS, SEBS.
As a further illustration of the above scheme, the star SIS is a star SIS having a styrene content of 18% -22% and a diblock content of 30-70%.
As a further illustration of the above scheme, the styrene content of the SBS is 30-50%.
As a further illustration of the above scheme, the styrene-butadiene rubber is a non-oil extended solution polymerized styrene-butadiene rubber, and the total styrene content of the styrene-butadiene rubber is 25-30%.
As a further explanation of the above, the styrene-butadiene rubber is one of styrene-butadiene rubber of model SOL 1205 selected from Dai Nasuo company and styrene-butadiene rubber of model SBR 2605 selected from Yueya company.
As a further explanation of the above, the tackifying resin is one or a mixture of two or more of terpene resin, hydrogenated C5 petroleum resin, hydrogenated C9 petroleum resin, and liquid petroleum resin.
As a further illustration of the above scheme, the liquid petroleum resin is a hydrogenated liquid petroleum resin model C-8010, available from Isman corporation.
As a further illustration of the above scheme, the poly alpha-methylstyrene resin has a softening point of 100 to 150℃and a number average molecular weight of 1000 to 5000.
As a further illustration of the above scheme, the poly alpha-methylstyrene resin has a softening point of 140 to 150℃and a number average molecular weight of 4000 to 5000.
As a further explanation of the above scheme, the plasticizer is one of naphthenic oil, white oil and phthalate; the antioxidant is one of an antioxidant 1010 and an antioxidant 168.
The second purpose of the invention is realized by adopting the following technical scheme:
a preparation method of a high-performance left-right adhesive hot melt adhesive comprises the following steps:
s1: confirming that a bottom valve of the reaction kettle is closed, opening steam heating, starting a stirring paddle, and adding a plasticizer, poly alpha-methyl styrene resin and an antioxidant;
s2: raising the temperature of the reaction kettle in the step S1 to 150-165 ℃, and adding the polymer with the formula amount; after the polymer is added, stirring for 15 minutes, adding styrene-butadiene rubber, after the polymer is added, scraping the wall of the reaction kettle, the polymer and the styrene-butadiene rubber on the stirring paddle by using a scraper after the polymer is not swelled any more, continuing stirring, sampling to completely melt after stirring for 45 minutes, continuing stirring if particles exist, and recording and prolonging the stirring time until the polymer and the styrene-butadiene rubber are melted;
s3: after the high diblock polymer in the S2 is completely melted, uniformly adding tackifying resin and stirring, and fully reacting after the tackifying resin is completely melted; vacuumizing the reaction kettle after all the materials are added, keeping the temperature in the reaction kettle at 150-165 ℃, and vacuumizing for 25-40min when the vacuum degree is above 0.07 and the materials are not swelled;
s4: after the reaction in the step S3 is completed, filtering the molten material in the reaction kettle;
s5: and (3) sequentially passing the filtered molten material in the step (S4) through a cooling system and a drying system, and finally packaging.
As a further explanation of the scheme, the high-performance left-right adhesive hot melt adhesive comprises the following components in percentage by mass: 15-35% of polymer, 3-10% of styrene-butadiene rubber, 10-25% of plasticizer, 25-55% of tackifying resin, 0.1-2% of antioxidant and 1-5% of poly alpha-methyl styrene resin; the sum of the mass percentages of the components is 100 percent.
Compared with the prior art, the invention has the beneficial effects that:
(1) The high-performance left and right hot melt adhesive prepared by the invention realizes excellent mechanical properties through the styrene-butadiene rubber and the fully hydrogenated petroleum resin, so that the left and right hot melt adhesive has excellent initial adhesion and peeling force, and can resist high temperature by adding SEBS or SBS or SIS with high tensile strength and matching with poly alpha-methyl styrene resin, and has excellent adhesion holding performance and good thermal stability;
(2) The high-performance left-right adhesive hot melt adhesive prepared by the invention has the advantages that the polymer part is compounded by adopting the high diblock SIS and the high styrene SBS, and the tackifying resin is matched, so that the hot melt adhesive has better wettability to the base materials such as CPP, BOPP, PET and the like by increasing the polarity, thereby improving the mechanical property of the hot melt adhesive; wherein, the hydrogenated petroleum resin with high softening point and the hydrogenated terpene resin are compounded, so that the adhesive holding force of the hot melt adhesive at high temperature can be further improved;
(3) In addition, after the tackifying resin is added, the vitrification temperature of the whole system can be reduced, so that the hot melt adhesive becomes softer, and the repeated pasting performance is further improved; the hot melt adhesive is applied to the fields of magic buckles, PP sticks, sticking buckles and the like of paper diapers, and the left and right sticks can realize the function of repeatedly sticking.
(4) The preparation method is simple, has no complex processing conditions, and is suitable for batch production.
Detailed Description
The present invention will be further described with reference to the following specific embodiments, and it should be noted that, on the premise of no conflict, new embodiments may be formed by any combination of the embodiments or technical features described below.
In the present invention, unless otherwise specified, all parts and percentages are by weight, equipment and materials used, etc., are available from commercially available common equipment and materials. The methods in the following examples are conventional in the art unless otherwise specified.
The method comprises the following steps:
a high-performance left-right adhesive hot melt adhesive comprises the following components in percentage by mass: 15-35% of polymer, 3-10% of styrene-butadiene rubber, 10-25% of plasticizer, 25-55% of tackifying resin, 0.1-2% of antioxidant and 1-5% of poly alpha-methyl styrene resin; the sum of the mass percentages of the components is 100 percent.
As a further preferable embodiment, the high-performance left-right adhesive hot melt adhesive comprises the following components in percentage by mass: 20-35% of polymer, 3-10% of styrene-butadiene rubber, 10-20% of plasticizer, 40-55% of tackifying resin, 0.1-1% of antioxidant and 1-5% of poly alpha-methyl styrene resin; the sum of the mass percentages of the components is 100 percent.
As a further preferable embodiment, the high-performance left-right adhesive hot melt adhesive comprises the following components in percentage by mass: 22-35% of polymer, 3-10% of styrene-butadiene rubber, 10-20% of plasticizer, 44-50% of tackifying resin, 0.1-0.8% of antioxidant and 1-5% of poly alpha-methyl styrene resin; the sum of the mass percentages of the components is 100 percent.
As a further preferred embodiment, the polymer is one or a mixture of two or more of star SIS, SBS, SEBS.
As a further preferred embodiment, the star SIS is a star SIS having a styrene content of 18% to 22% and a diblock content of 30% to 70%.
As a further preferred embodiment, the styrene content of the SBS is 30-50%.
As a further preferred embodiment, the styrene-butadiene rubber is a non-oil extended solution polymerized styrene-butadiene rubber, and the total styrene content of the styrene-butadiene rubber is 25-30%; wherein 17.5 to 22% are present as polystyrene blocks.
As a further preferred embodiment, the styrene-butadiene rubber is one of styrene-butadiene rubber of model SOL 1205, which is purchased from Dai Nasuo company, and styrene-butadiene rubber of model SBR 2605, which is purchased from Yueya company.
As a further preferred embodiment, the tackifying resin is one or a mixture of two or more of terpene resin, hydrogenated C5 petroleum resin, hydrogenated C9 petroleum resin, and liquid petroleum resin.
As a further preferred embodiment, the liquid petroleum resin is a hydrogenated liquid petroleum resin model C-8010, which is commercially available from Isman corporation.
As a further preferred embodiment, the poly alpha-methylstyrene resin has a softening point of 100 to 150℃and a number average molecular weight of 1000 to 5000.
As a further preferred embodiment, the poly alpha-methylstyrene resin has a softening point of 140 to 150℃and a number average molecular weight of 4000 to 5000.
As a further preferred embodiment, the plasticizer is one of naphthenic oil, white oil, phthalate esters; the antioxidant is one of an antioxidant 1010 and an antioxidant 168.
The polymer in the formula of the invention is selected from styrene-isoprene-styrene (SIS), styrene-butadiene-styrene (SBS) or hydrogenated styrene-ethylene/butylene-styrene (SEBS), and has the function that the high tensile strength polymer can endow the hot melt adhesive with excellent adhesive holding force, and when the system polymer is increased, the initial adhesive force and the adhesive holding force of the hot melt adhesive can be properly improved.
In order to ensure that the hot melt adhesive has the repeated adhesion performance, the polymer part of the invention is compounded by adopting high diblock SIS and high styrene SBS, and the high diblock polymer selected by the invention can comprise star SIS which is mainly from 4019 (the styrene content is 19 percent, the diblock is 30 percent) or 4016 (the styrene content is 19 percent and the diblock is 69 percent) of Yueyang petrochemical industry.
The naphthenic oil in the formula of the invention is one of petroleum rubber oil, and the petroleum rubber oil comprises three kinds of paraffin base, cycloalkyl and aromatic hydrocarbon base. The naphthenic oil is mainly composed of naphthene, has good affinity, little pollution or no pollution, and plays a role in softening in the formula.
The styrene-butadiene rubber selected in the formula can endow the hot melt adhesive with stronger initial adhesion performance and good wettability to a base material, is helpful for repeated adhesion performance after being added, and can reduce the cohesive force of the hot melt adhesive when the dosage is excessive, thereby reducing the adhesion retention performance; the research shows that when the using amount of the styrene-butadiene rubber is 5% of the using amount of the formula, the effect of improving the repeated pasting performance is optimal.
The tackifying resin in the formula is preferably hydrogenated terpene resin or terpene resin, and the polarity is increased to realize better wettability of the hot melt adhesive to CPP, BOPP, PET and other base materials, so that the mechanical property of the hot melt adhesive is improved; the tackifying resin is preferably compounded by hydrogenated petroleum resin with high softening point and hydrogenated terpene resin, so that the adhesive holding force of the hot melt adhesive at high temperature can be further improved. The tackifying resin can be liquid petroleum resin, and the glass transition temperature of the whole system can be reduced after the tackifying resin is added, so that the adhesive becomes softer, and the repeated pasting performance is further improved.
The poly alpha-methyl styrene resin in the formula of the invention can improve the viscosity maintenance performance of the hot melt adhesive at high temperature, and the tackifying resin can endow the hot melt adhesive with higher stripping force.
The antioxidant in the formula of the invention has the functions of: can prevent the oxidation of the polymer, resulting in breaking of macromolecular chains, crosslinking and deterioration of performance.
The invention realizes excellent mechanical properties through SBR and perhydrogenated petroleum resin, so that the left and right hot melt adhesive has excellent initial adhesion and peeling force, and the high temperature resistance and excellent adhesion retention performance and good thermal stability can be realized by adding SEBS or SBS or SIS with high tensile strength and matching with poly alpha-methyl styrene resin.
The hot melt adhesive is mainly polymer, tackifying resin, plasticizer and poly alpha-methyl styrene resin, the styrene-butadiene rubber can endow the hot melt adhesive with stronger initial adhesion performance and good wettability to a base material, the high-tensile-strength polymer can endow the hot melt adhesive with excellent adhesive holding force, the poly alpha-methyl styrene resin can improve the adhesive holding performance of the hot melt adhesive at high temperature, and the tackifying resin can endow the hot melt adhesive with higher stripping force. In order to ensure that the hot melt adhesive has the repeated adhesion performance, the polymer part of the invention is compounded by adopting high diblock SIS and high styrene SBS.
The invention also provides a preparation method of the high-performance left-right adhesive hot melt adhesive, which comprises the following steps:
s1: confirming that a bottom valve of the reaction kettle is closed, opening steam heating, starting a stirring paddle, and adding a plasticizer, poly alpha-methyl styrene resin and an antioxidant;
s2: raising the temperature of the reaction kettle in the step S1 to 150-165 ℃, and adding the polymer with the formula amount; after the polymer is added, stirring for 15 minutes, adding styrene-butadiene rubber, after the polymer is added, scraping the wall of the reaction kettle, the polymer and the styrene-butadiene rubber on the stirring paddle by using a scraper after the polymer is not swelled any more, continuing stirring, sampling to completely melt after stirring for 45 minutes, continuing stirring if particles exist, and recording and prolonging the stirring time until the polymer and the styrene-butadiene rubber are melted;
s3: after the polymer in the S2 is completely melted, uniformly adding tackifying resin and stirring, and fully reacting after the tackifying resin is completely melted; vacuumizing the reaction kettle after all the materials are added, keeping the temperature in the reaction kettle at 150-165 ℃, and vacuumizing for 25-40min when the vacuum degree is above 0.07 and the materials are not swelled;
s4: after the reaction in the step S3 is completed, filtering the molten material in the reaction kettle;
s5: and (3) sequentially passing the filtered molten material in the step (S4) through a cooling system and a drying system, and finally packaging. As a further preferable embodiment, the amount of the rubber oil fed in the S1 is 60 to 80% of the total amount of the rubber polymer fed.
As a further preferable embodiment, the high-performance left-right adhesive hot melt adhesive comprises the following components in percentage by mass: 15-35% of polymer, 3-10% of styrene-butadiene rubber, 10-25% of plasticizer, 25-55% of tackifying resin, 0.1-2% of antioxidant and 1-5% of poly alpha-methyl styrene resin; the sum of the mass percentages of the components is 100 percent.
Regarding the preparation process, because the process requirements of the common hot melt adhesive are low, only simple physical mixing is performed, no reaction process exists, and the main emphasis in the preparation process of the invention is as follows:
1. the feeding sequence is strictly controlled, particularly the softening point of the poly alpha-methyl styrene resin is higher, the melting is needed to be added in advance, and if the poly alpha-methyl styrene resin is added later, the condition that the temperature in the kettle is too low to be melted can be caused;
2. the polymer is added into the kettle earlier than the styrene-butadiene rubber, because the styrene-butadiene rubber is easy to melt, if the styrene-butadiene rubber is added simultaneously, the structure of the styrene-butadiene rubber is damaged due to overlong stirring time, so that the performance of the product is affected.
The following are specific examples of the present invention, in which raw materials, equipment, etc. used are available in a purchase manner except for specific limitations.
Examples 1-5 and comparative example 1:
the raw materials were weighed according to the proportions shown in Table 1, and the products were prepared according to the procedures shown in examples 1 to 5, specifically shown in Table 1:
table 1 raw material ratio table of examples 1 to 5 and comparative example 1
In table 1, the raw materials used were identical for the purpose of comparability of the test effect unless otherwise specified.
The ratio of terpene resin to hydrogenated C9 petroleum resin in the above formulation was 1:8, 8; the ratio of terpene resin to hydrogenated C5 petroleum resin was 1:8.
the softening point of the hydrogenated C5 petroleum resin with high softening point is 110-130 ℃; the softening point of the high softening point hydrogenated C9 petroleum resin is 110-130 ℃;
the hot melt adhesive of comparative example 1 was different in formulation in that styrene-butadiene rubber and poly-alpha-methylstyrene resin were not added and in that the rubber polymer was selected differently.
The hot melt adhesive preparation method of the above examples 1 to 5 comprises the following steps:
s1: confirming that a bottom valve of the reaction kettle is closed, opening steam heating, starting a stirring paddle, and adding a plasticizer, poly alpha-methyl styrene resin and an antioxidant;
s2: raising the temperature of the reaction kettle in the step S1 to 150-165 ℃, and adding the high diblock polymer with the formula amount; stirring for 15 minutes after the addition of the high diblock polymer is completed, adding styrene-butadiene rubber, scraping the tank wall of the reaction kettle and the high diblock polymer and the styrene-butadiene rubber on the stirring paddle by using a scraper after the addition is completed and waiting for no more material expansion, continuing stirring for 45 minutes, sampling to completely melt or not, continuing stirring if particles exist, and recording and prolonging the stirring time until the high diblock polymer and the styrene-butadiene rubber are melted;
s3: after the high diblock polymer in the S2 is completely melted, uniformly adding tackifying resin and stirring, and fully reacting after the tackifying resin is completely melted; vacuumizing the reaction kettle after all the materials are added, keeping the temperature in the reaction kettle at 150-165 ℃, and vacuumizing for 25-40min when the vacuum degree is above 0.07 and the materials are not swelled;
s4: after the reaction in the step S3 is completed, filtering the molten material in the reaction kettle;
s5: and (3) sequentially passing the filtered molten material in the step (S4) through a cooling system and a drying system, and finally packaging.
The preparation method of comparative example 1 described above was conducted with reference to the preparation methods of examples 1 to 5, except that the operation of adding no poly alpha-methylstyrene resin in S1 and the operation of adding no styrene-butadiene rubber in S2 were conducted.
Effect evaluation and Performance detection
The hot melt adhesives of examples 1 to 5 and comparative example 1 were tested for properties, test items and results, see Table 2.
1. Viscosity test method
Viscosity was measured using a model DV2TRVT viscometer and a model 27 spindle from Bowler-Nordheim corporation, U.S. Pat. No. 2, according to GB/T2794 specifications. Results are reported in centipoise (cps).
2. Softening point test method
Softening points were tested using an SD-0606T automatic softening point tester, a institute of Shanghai Deuteri instruments, according to GB/T15332 specifications. Results are recorded in degrees celsius (°c).
3.180 DEG peel strength and annular primary adhesion test method
180℃peel strength was tested according to the specifications of the national standard GB/T2792-2014 and loop tack was tested according to the specifications of the national standard GB/T31125-2014. Coating the prepared hot melt adhesive on the surface of a high-transparency PET film with the thickness of 30 micrometers by using a film coater, attaching a release film, standing for 24 hours at room temperature, and testing 180-degree peel strength and annular primary adhesion; the results are recorded in N/inch.
4. Repeated pasting performance test method
After the 180-degree peel strength and the annular primary adhesion are tested for the first time, the second, third, fourth and fifth tests are carried out; the results are recorded in N/inch.
Method for testing holding time at 5.40 DEG C
A sample is coated by hot melt adhesive with the width of 25mm and the length of 140mm in a longitudinal direction, the sample is stuck on a substrate such as CPP, BOPP, PET, a 1kg weight is hung on the compounded sample, and then the sample is hung in a baking oven at the temperature of 40 ℃ to start timing.
The test results of the above test items are shown in table 2:
table 2 summary of test data table
As shown in the table above, the peel strength of the left and right hot melt adhesive prepared by the invention is more than 30N/inch, the annular initial adhesion is more than 30N/inch, and the adhesive holding time at 40 ℃ is more than 30min, so that the adhesive has excellent peel, initial adhesion and adhesive holding performance.
As shown in the above table, example 5 is the best example in the present invention, the peel strength and the annular initial tack performance of the high-performance left-right hot melt adhesive prepared in example 5 are optimal, the function of repeated adhesion can be realized, and the decrease of the peel strength and the annular initial tack performance is small with the increase of the number of repeated adhesion. As proved by repeated experiments, the styrene-butadiene rubber selected in the formula can endow the hot melt adhesive with stronger initial adhesion performance and good wettability to a base material, the styrene-butadiene rubber is helpful to repeated adhesion performance after being added, and when the styrene-butadiene rubber is used in excessive amount, the cohesion of the hot melt adhesive is reduced, so that the adhesion retention performance is reduced; the research shows that when the using amount of the styrene-butadiene rubber is 5% of the using amount of the formula, the effect of improving the repeated pasting performance is optimal.
In example 4, the amount of styrene-butadiene rubber used was 2 times that of example 5, and the peel strength and the loop tack performance of the prepared hot melt adhesive were slightly inferior to those of example 5, especially the tack time in the environment of 40 ℃ was greatly reduced, further indicating that when the amount of styrene-butadiene rubber used was too much, the cohesive force of the hot melt adhesive was reduced, thereby reducing the tack performance.
Comparative example 1 has a large difference from the hot melt adhesives prepared in examples 1 to 5 in peel strength, loop-type initial adhesion property and repeated adhesion property since styrene-butadiene rubber and poly-alpha-methylstyrene resin are not added, and the duration of adhesion in an environment of 40 c is only 40% of the duration of adhesion in the best embodiment of the present invention, example 5. The formula design of the hot melt adhesive is more reasonable, and the prepared hot melt adhesive has excellent mechanical properties.
The high-performance left and right hot melt adhesive prepared by the invention can be applied to the fields of paper diaper magic buckles, paper diaper PP (Polypropylene) patches, sticking buckles and the like, and can realize the function of repeatedly sticking the left and right hot melt adhesive. In particular, in the manufacturing of the adult diaper with high manufacturing cost, the core body is replaced, so that the excellent repeated pasting function of the adult diaper greatly reduces the production and use cost of the adult diaper.
The manufacturer information of the components used in the above examples and comparative examples is shown in Table 3:
table 3: table of manufacturer of each component
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.
Claims (4)
1. The high-performance left-right adhesive hot melt adhesive is characterized by comprising the following components in percentage by mass:
25-35% of polymer, 5% of styrene-butadiene rubber, 10-20% of plasticizer, 44-50% of tackifying resin, 0.1-2% of antioxidant and 3-5% of poly alpha-methyl styrene resin; the sum of the mass percentages of the components is 100 percent;
the polymer is one of star SIS and SBS; the star SIS is 18-22% of styrene and 30-70% of diblock; the styrene content of the SBS is 30-50%;
the tackifying resin is a mixture of terpene resin and one of hydrogenated C5 petroleum resin and hydrogenated C9 petroleum resin; the ratio of the terpene resin to the hydrogenated C5 petroleum resin or the terpene resin to the hydrogenated C9 petroleum resin is 1:8; the styrene-butadiene rubber is non-oil-extended solution polymerized styrene-butadiene rubber, and the total styrene content of the styrene-butadiene rubber is 25-30%;
the preparation method of the high-performance left-right adhesive hot melt adhesive comprises the following steps:
s1: confirming that a bottom valve of the reaction kettle is closed, opening steam heating, starting a stirring paddle, and adding a plasticizer, poly alpha-methyl styrene resin and an antioxidant;
s2: raising the temperature of the reaction kettle in the step S1 to 150-165 ℃, and adding the polymer with the formula amount; after the polymer is added, stirring for 15 minutes, adding styrene-butadiene rubber, after the polymer is added, scraping the wall of the reaction kettle, the polymer and the styrene-butadiene rubber on the stirring paddle by using a scraper after the polymer is not swelled any more, continuing stirring, sampling to completely melt after stirring for 45 minutes, continuing stirring if particles exist, and recording and prolonging the stirring time until the polymer and the styrene-butadiene rubber are melted;
s3: after the polymer in the S2 is completely melted, uniformly adding tackifying resin and stirring, and fully reacting after the tackifying resin is completely melted; vacuumizing the reaction kettle after all the materials are added, keeping the temperature in the reaction kettle at 150-165 ℃, and vacuumizing for 25-40min when the vacuum degree is above 0.07 and the materials are not swelled;
s4: after the reaction in the step S3 is completed, filtering the molten material in the reaction kettle;
s5: and (3) sequentially passing the filtered molten material in the step (S4) through a cooling system and a drying system, and finally packaging.
2. The high-performance left and right adhesive hot melt adhesive according to claim 1, wherein the softening point of the poly alpha-methyl styrene resin is 100-150 ℃ and the number average molecular weight is 1000-5000.
3. The high-performance left and right adhesive hot melt adhesive according to claim 1, wherein the plasticizer is one of naphthenic oil, white oil and phthalate esters; the antioxidant is one of an antioxidant 1010 and an antioxidant 168.
4. The method for preparing the high-performance left-right adhesive hot melt adhesive according to claim 1, which is characterized by comprising the following steps:
s1: confirming that a bottom valve of the reaction kettle is closed, opening steam heating, starting a stirring paddle, and adding a plasticizer, poly alpha-methyl styrene resin and an antioxidant;
s2: raising the temperature of the reaction kettle in the step S1 to 150-165 ℃, and adding the polymer with the formula amount; after the polymer is added, stirring for 15 minutes, adding styrene-butadiene rubber, after the polymer is added, scraping the wall of the reaction kettle, the polymer and the styrene-butadiene rubber on the stirring paddle by using a scraper after the polymer is not swelled any more, continuing stirring, sampling to completely melt after stirring for 45 minutes, continuing stirring if particles exist, and recording and prolonging the stirring time until the polymer and the styrene-butadiene rubber are melted;
s3: after the polymer in the S2 is completely melted, uniformly adding tackifying resin and stirring, and fully reacting after the tackifying resin is completely melted; vacuumizing the reaction kettle after all the materials are added, keeping the temperature in the reaction kettle at 150-165 ℃, and vacuumizing for 25-40min when the vacuum degree is above 0.07 and the materials are not swelled;
s4: after the reaction in the step S3 is completed, filtering the molten material in the reaction kettle;
s5: sequentially passing the filtered molten material in the step S4 through a cooling system and a drying system, and finally packaging;
the high-performance left-right adhesive hot melt adhesive comprises the following components in percentage by mass: 25-35% of polymer, 5% of styrene-butadiene rubber, 10-20% of plasticizer, 44-50% of tackifying resin, 0.1-2% of antioxidant and 3-5% of poly alpha-methyl styrene resin; the sum of the mass percentages of the components is 100 percent.
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| CN114350290B (en) * | 2022-01-10 | 2023-01-20 | 广州鹿山新材料股份有限公司 | Low-temperature-resistant glue and preparation method and application thereof |
| CN114456751B (en) * | 2022-01-24 | 2023-04-07 | 华威粘结材料（上海）股份有限公司 | Hot melt adhesive for automatic packaging of cotton harvesting and preparation method and application thereof |
| CN114921206B (en) * | 2022-06-06 | 2024-04-09 | 佛山南宝高盛高新材料有限公司 | Hot melt adhesive for cutting paper diaper S and preparation method thereof |
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