CN113429910B - Glue for label of yoghourt packaging cup and production method thereof - Google Patents
Glue for label of yoghourt packaging cup and production method thereof Download PDFInfo
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- CN113429910B CN113429910B CN202110786831.6A CN202110786831A CN113429910B CN 113429910 B CN113429910 B CN 113429910B CN 202110786831 A CN202110786831 A CN 202110786831A CN 113429910 B CN113429910 B CN 113429910B
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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
- C09J11/06—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
- 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
Abstract
The application relates to the field of adhesives, in particular to an adhesive for a label of a yogurt packaging cup and a production method thereof. The glue for the label of the yoghourt packaging cup is prepared by melting and mixing the following raw materials in percentage by weight: tackifying resin: 25-35%; ethylene-vinyl acetate copolymer: 40-48%; elastomer: 3-5%; softening agent: 10-25%; antioxidant: 0.1-1%; the ethylene-vinyl acetate copolymer has a melt index of more than 150g/10min, and the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 15-25%. The utility model provides a glue for label can make and form firm adhesive connection fast between label and the packing cup, all has more excellent adhesion simultaneously under normal atmospheric temperature and low temperature, is difficult for taking place warpage, the phenomenon of coming unstuck under the low temperature.
Description
Technical Field
The application relates to the field of adhesives, in particular to an adhesive for a label of a yogurt packaging cup and a production method thereof.
Background
The label pasted on the product package is an important channel for displaying product information and publicizing product performance. At present, the preparation method of the label for the outer package is that the hot melt adhesive is melted and coated on the back surface of the label, and the label is directly attached to the outer package when in use.
The cup-packed yoghourt is an instant food, has high nutritive value, is easy to deteriorate at normal temperature, and needs to be refrigerated and preserved in the front-end processes of transportation, sale and the like in order to prolong the shelf life of the cup-packed yoghourt. Therefore, the outer package of the cup is usually made of plastic, and the plastic cup is stable in property and beneficial to keeping the heat conductivity and the strength performance in a low-temperature refrigeration environment.
The inventor thinks that when the adhesive label on the market is applied, firm adhesive connection between the adhesive label and the packaging cup is difficult to be formed quickly, and the service performance is poor.
Content of application
In order to shorten the time for forming firm adhesive connection between the adhesive label and the packaging cup and improve the service performance of the adhesive label, the application provides the adhesive for the label of the yoghourt packaging cup and the production method thereof.
In a first aspect, the application provides a glue for a label of a yogurt packaging cup, which adopts the following technical scheme:
the glue for the label of the yoghourt packaging cup is prepared by melting and mixing the following raw materials in percentage by weight:
tackifying resin: 25-35%;
ethylene-vinyl acetate copolymer: 40-48%;
elastomer: 3-5%;
softening agent: 10-25%;
antioxidant: 0.1-1%;
the ethylene-vinyl acetate copolymer has a melt index of more than 150g/10min, and the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 15-25%.
Tests show that the time for forming firm adhesion between the adhesive and an adhered object is effectively shortened and the service performance of the adhesive is improved by adopting the ethylene-vinyl acetate copolymer with the melt index of more than 150g/10min and the content of Vinyl Acetate (VA) of 15-25%. The reason for this may be that the ethylene-vinyl acetate copolymer with the above parameters has excellent fluidity and viscosity, and can rapidly infiltrate into the surface of the adherend, thereby forming sufficient intermolecular force to achieve rapid attachment.
Preferably, the elastomer is SEBS elastomer.
In the process of low-temperature refrigeration (-15 to-18 ℃), the viscosity of the label adhesive is seriously reduced, and the label is easy to warp and even degum. Through adopting the SEBS elastomer in this application, can show to reduce under the low temperature environment, warping and the phenomenon of coming unstuck that the label viscidity descends to lead to.
This may be because the adhesive force between the adhesive and the adherend is generally generated by intermolecular force, and when the temperature is lowered, the intermolecular force between the adhesive and the adherend is lowered, resulting in lowering of the adhesiveness thereof. By adding the SEBS elastomer, on one hand, the yogurt outer package is usually made of polypropylene (PP) materials or Polyethylene (PE) materials, the SEBS elastomer is high in compatibility with PP and PE, and when the adhesive is melted at high temperature for bonding, the SEBS elastomer can generate mutual diffusion effect with PP and PE polymers through Brownian motion of molecules or motion of chain segments, so that a tighter bonding structure is formed, and the bonding structure is not easy to lose effectiveness due to viscosity at low temperature; on the other hand, the SEBS elastomer has a thickening effect on the adhesive, and can improve the toughness of the adhesive, reduce the rigidity thereof, and reduce the warpage.
Preferably, the softening agent is a composition of paraffin oil and paraffin wax in a weight ratio of 1 (3-5), the melting point of the paraffin wax is 70-90 ℃, and the paraffin oil is light paraffin oil.
By adopting the technical scheme, the composition of paraffin oil and paraffin can effectively improve the viscosity of the adhesive and the adhered object while playing a lubricating role, thereby reducing the probability of label warping or degumming. The reason for this is probably that the paraffin wax having a melting point of 70 to 90 ℃ has not only an excellent lubricating effect but also good flexibility and adhesiveness. The paraffin oil can be matched with the SEBS elastomer, so that on one hand, the fluidity of the SEBS elastomer is improved; on the other hand, small-molecule paraffin oil enters between molecular chains of the SEBS, so that the distance between the molecular chains of the SEBS is increased, the adsorption area of the SEBS and an adhered object is increased, the adhesion between the adhesive and the surface of the adhered object is favorably improved, and finally, the probability of warping or falling off of the label in a low-temperature environment is reduced.
Preferably, the tackifying resin comprises the following components in percentage by weight:
petroleum resin: 4-7%;
rosin resin: 18-22%;
terpene resin: 2-4%;
maleic anhydride: 1 to 2 percent.
By adopting the technical scheme, the terpene resin is matched with the maleic anhydride, so that the probability of label warping and degumming at low temperature can be obviously reduced. The reason for this may be that the terpene resin has a good polarity, and can generate hydrogen bond force with the surface of the adherend, so as to compensate the decrease of viscosity caused by the decrease of molecular force between the adhesive and the adherend in a low temperature environment; the maleic anhydride is used for compatibilization, the compatibility between polar polymer terpene resin and non-polar polymer petroleum resin and rosin resin is improved, and the problem that the polar polymer and the non-polar polymer are mutually exclusive and are difficult to mix is solved, so that the performance of the viscosity of the label adhesive is ensured.
In addition, the polymer having a polar group can form a network structure by crosslinking, and a small molecular substance such as paraffin is fixed in the polymer to inhibit the migration thereof to the bonding interface, thereby maintaining the adhesion between the label and the surface to be bonded.
Preferably, the petroleum resin is C5 petroleum resin, and the weight ratio of the petroleum resin to the rosin resin is 1 (3-4).
By adopting the technical scheme, the initial viscosity of the C5 petroleum resin is good, the sticking speed of the label is favorably improved, the rosin resin has better adhesive force, and the warping phenomenon at low temperature is favorably reduced.
Preferably, the rosin resin consists of (7-9) to (11-13) of rosin resin and modified rosin resin in a weight ratio, and the modified rosin resin is hydrogenated rosin resin.
By adopting the technical scheme, the rosin resin has good wettability and a good tackifying effect, but the rosin resin contains more organic substances with pungent odor, and the rosin odor is easy to bring uncomfortable feeling after being inhaled for a long time, so that the customer experience is not improved.
According to the application, most of rosin resin is replaced by hydrogenated rosin resin, so that the pungent smell of rosin can be effectively reduced on the premise of ensuring the viscosity of the label adhesive.
In a second aspect, the application provides a method for producing glue for packaging cup labels, which adopts the following technical scheme:
a production method of glue for a label of a yoghourt packaging cup comprises the following steps:
s1, adding a softening agent at 120-130 ℃, heating to 140-150 ℃ within 5-10 min, adding 4-7 wt% of tackifying resin, melting and mixing uniformly, and mixing for 15-20 min to obtain a first mixed phase;
s2, adding 2/3 elastomer into the first mixed phase, carrying out melt mixing for 5-10 min, adjusting the temperature to 150-160 ℃, adding the rest elastomer, and mixing for 30-40 min to obtain a second mixed phase;
s3, adding 11-13 wt% of tackifying resin into the second mixed phase at the temperature of 150-160 ℃, fully mixing, adding ethylene-vinyl acetate copolymer after 10-15 min, and melting and uniformly mixing to obtain a third mixed phase;
and S4, adding the ethylene-vinyl acetate copolymer in the step S3 for 10-20 min at the temperature of 150-160 ℃, adding the rest tackifying resin and the antioxidant into the third mixed phase, melting and mixing uniformly, pressurizing to 0.2-0.3 MPa after 15-20 min, discharging, and granulating and cooling to obtain finished product particles.
By adopting the above-mentioned raw material addition sequence, it is advantageous to disperse the polymer phases uniformly, and further to promote the development of the viscosity. The reason for this may be that, with the above-mentioned order of addition, on the one hand, the difference in softening point and endothermic amount of the substance is taken into account; on the other hand, the viscosity of the raw materials such as a tackifier resin and an elastomer is high, and the addition of the antioxidant is not favorable for improving the fluidity during mixing, so that the raw material polymers are difficult to be uniformly dispersed, and particularly, the antioxidant in a solid powder form is difficult to be sufficiently dispersed if the tackifier resin is not sufficiently melted, and further, the antioxidant is liable to bleed out to the surface of the adhesive and the adherend due to a problem of compatibility, thereby causing a decrease in the viscosity of the label adhesive.
Preferably, in step S1, the tackifying resin is petroleum resin, and the softening agent is paraffin; in step S2, the elastomer is SEBS elastomer, and the softener is paraffin oil; in step S3, the tackifying resin is a modified rosin resin; in step S4, the tackifying resin is a mixture of rosin resin, terpene resin and maleic anhydride.
By adopting the technical scheme, in the step S2, the paraffin oil and the SEBS elastomer are mixed in advance, so that small-molecule paraffin oil can enter between SEBS molecular chains, the increase of the molecular chain spacing is promoted, the intermolecular force is reduced, and the acting force with the bonded object is improved; meanwhile, the molecular chain is fully unfolded, the adhesion area is increased, and the adhesion force is enhanced.
In addition, the increase of the molecular chain spacing increases the amorphous area of the SEBS elastomer, reduces the crystallinity and further improves the toughness; finally, the toughening effect of the label is improved, and the label warping phenomenon is reduced.
In summary, the present application has the following beneficial effects:
1. the ethylene-vinyl acetate copolymer is used as the main agent of the adhesive, and the EVA melt index and the VA content are optimized, so that the time for forming firm adhesion between the adhesive and an adhered object can be obviously shortened, and the service performance of the adhesive is improved.
2. Preferably, the SEBS elastomer is adopted and matched with paraffin oil, so that the adhesive force of the adhesive and the bonded object is effectively improved, and the probability of label warping and degumming at low temperature is reduced.
3. The tackifying resin preferably adopts rosin resin, petroleum resin and hydrogenated rosin resin, so that the pungent smell of the adhesive is obviously reduced and the customer experience is improved on the premise of ensuring the adhesive force of the adhesive.
4. The terpene resin and maleic anhydride are preferably added to the tackifier disclosed by the application, so that the reduction of viscosity caused by the reduction of intermolecular force between the tackifier and the surface of an adhered object in a low-temperature environment can be effectively compensated, and the problem of label warping and even degumming at low temperature can be remarkably relieved.
Detailed Description
The present application will be described in further detail with reference to examples.
Examples
Example 1, a glue for a label of a yogurt packaging cup, wherein the selection of the raw material components and the corresponding amounts thereof are shown in table 1, and the glue is prepared according to the following steps:
s1, adding paraffin with the melting point of 80 ℃ at 120 ℃, heating to 140 ℃ within 5min, adding petroleum resin, melting and uniformly stirring to obtain a first mixed phase;
s2, adding 2/3 elastomer into the first mixed phase, melting and stirring for 10min, heating to 150 ℃, adding the rest elastomer, stirring and mixing for 40min to obtain a second mixed phase;
s3, heating the second mixed phase to 160 ℃, adding 11-13 wt% of tackifying resin into the second mixed phase, stirring for 15min, adding an ethylene-vinyl acetate copolymer with a melt index of 400g/10min and a VA content of 19% (Tai plastic 7B50H), and continuously stirring uniformly to obtain a third mixed phase;
and S4, keeping the temperature at 150-160 ℃, adding the ethylene-vinyl acetate copolymer in the step S3 for 20min, adding the rosin resin, the terpene resin, the maleic anhydride and the antioxidant into the third mixed phase, uniformly stirring and mixing, pressurizing to 0.2MPa after 15min, discharging, and granulating and cooling to obtain finished label adhesive particles.
Example 2, a glue for a label of a yogurt packaging cup, wherein the selection of the raw material components and the corresponding amounts thereof are shown in table 1, and the glue is prepared according to the following steps:
s1, adding paraffin with the melting point of 90 ℃ at 130 ℃, heating to 150 ℃ within 10min, adding petroleum resin, and melting and mixing uniformly to obtain a first mixed phase;
s2, adding 2/3 elastomer into the first mixed phase, melting and stirring for 5min, heating to 160 ℃, adding the rest elastomer, stirring and mixing for 40min to obtain a second mixed phase;
s3, keeping the temperature of the second mixed phase at 150-160 ℃, adding 11-13 wt% of tackifying resin into the second mixed phase, stirring for 10min, adding an ethylene-vinyl acetate copolymer with a melt index of 400g/10min and a VA content of 19% (Korea EVA1520), and continuously stirring uniformly to obtain a third mixed phase;
and S4, keeping the temperature at 150-160 ℃, adding the ethylene-vinyl acetate copolymer in the step S3 for 10min, adding the rosin resin, the terpene resin, the maleic anhydride and the antioxidant into the third mixed phase, stirring and mixing uniformly, pressurizing to 0.3MPa after 20min, discharging, and granulating and cooling to obtain finished label adhesive particles.
Examples 3 to 12 show that the difference between the yogurt packaging cup label glue and example 1 is that the selection of each raw material component and the corresponding amount thereof are shown in table 1.
Table 1 selection of raw material components and their respective amounts (kg) of the label stock in examples 1 to 12
Wherein, the raw material components in Table 1 which are replaced by equal amount are replaced correspondingly in the preparation steps of the glue for labels of corresponding examples, and the petroleum resin in Table 1 adopts C5 petroleum resin.
TABLE 2 manufacturer model information of raw material composition
Example 15, a label adhesive for yogurt packaging cups, which is different from example 1 in that the petroleum resin is C9 petroleum resin.
Example 16, a label gum for yogurt packaging cups, which is different from example 1 in that it is prepared by the following steps:
s1, adding a softening agent at 120-130 ℃, heating to 150 ℃ within 10min, adding all tackifying resins, and stirring and mixing for 1h to obtain a first mixed phase;
s2, adding 2/3 elastomer into the first mixed phase, melting and stirring for 5min, heating to 160 ℃, adding the rest elastomer, stirring and mixing for 40min to obtain a second mixed phase;
s3, keeping the temperature of the second mixed phase at 150-160 ℃, adding an ethylene-vinyl acetate copolymer with a melt index of 400g/10min and a VA content of 19% (Korea EVA1520), and continuously stirring uniformly to obtain a third mixed phase;
and S4, keeping the temperature at 150-160 ℃, adding the ethylene-vinyl acetate copolymer in the step S3 for 10min, adding an antioxidant into the third mixed phase, stirring and mixing uniformly, pressurizing to 0.3MPa after 20min, discharging, and granulating and cooling to obtain finished label adhesive particles.
Comparative example
Comparative example 1, a label gum for yogurt packing cups, was different from example 1 in that the ethylene-vinyl acetate copolymer added in step S3 had a melt index of 400g/10min and a VA content of 28% (Taiwan plastic 7B 60H).
Comparative example 2, a label gum for yogurt packing cups, was different from example 1 in that the ethylene-vinyl acetate copolymer added in step S3 had a melt index of 150g/10min and a VA content of 19% (Tatai plastic 7A 50H).
Comparative example 3, a label gum for yogurt packing cups, was different from example 1 in that the ethylene-vinyl acetate copolymer added in step S3 had a melt index of 150g/10min and a VA content of 28% (Table model 7A 60H).
Comparative example 4 thermoplastic rubber resin from Xiamen star, working temperature 160 ℃.
Performance test
Test 1: the initial viscosity test method of the glue for the label of the yoghourt packaging cup comprises the following steps: the detection is carried out according to the method 1 (the 180-degree peeling strength test method of the adhesive tape and the stainless steel) in GB/T2792-2014. The finished label adhesive particles prepared in examples 1 to 16 and comparative examples 1 to 4 were melted at 160 ℃ and then sprayed on the surface of label paper to obtain a label sample. Immediately thereafter, the label sample was applied to the surface of a PP plate (available from Standless Poult), and continuously peeled off at a rate of (5. + -. 0.2) mm/s by a tensile tester at (23. + -. 1) ℃ and (50. + -.5) wt% in an atmosphere of (23. + -. 1). The number of label samples in each group was 3, and the test results were represented by the arithmetic mean of the peel strengths and were recorded as the initial peel strength. The higher the initial peel strength, the shorter the time for firm adhesion to be formed between the adhesive and the adherend, and the test results are shown in table 3.
Test 2: preparing a sample for testing the adhesion performance of the label of the yoghourt packaging cup at normal temperature and low temperature by using the glue: the finished label adhesive particles prepared in examples 1 to 16 and comparative examples 1 to 4 were melted at 160 ℃ and then sprayed on the surface of label paper to obtain a label sample.
The test method comprises the following steps: and (3) detecting according to a method 1 (a 180-degree peeling strength test method of the adhesive tape and the stainless steel) in GB/T2792-2014.
(1) The label sample was applied to the surface of a PP plate (purchased from Stannless Pont), allowed to stand at (23. + -. 1) ℃ for 4 hours in an environment of (50. + -. 5) wt%, and then continuously peeled off at a rate of (5. + -. 0.2) mm/s in this environment by a tensile tester. The number of each group of label samples was 3, the test results were represented by the arithmetic mean of the peel strengths and were recorded as the peel strength at room temperature, and the test results are shown in table 3.
(2) The label sample is attached to the surface of a PP plate (purchased from tin-free Poulter), is kept stand for 4 hours in an environment of (-18 +/-1) DEG C, is observed for warping and degumming conditions, and is continuously peeled at a speed of (5 +/-0.2) mm/s by using a tensile testing machine in the environment if the label sample is not degummed. The number of each group of label samples was 3, and the test results were represented by the arithmetic mean of the peel strengths and were recorded as the low temperature peel strength, and the test results are shown in table 3.
Table 3 peel strength test results for labels
And (3) analyzing test results:
(1) by combining examples 1-16 and comparative examples 1-4 and combining table 3, it can be seen that the adhesive prepared by using the ethylene-vinyl acetate copolymer with the melt index of more than 150g/10min and the vinyl acetate content of 15-25% has more excellent initial peel strength. The reason for this is probably that the melt index is high, the fluidity, wettability and permeability are high, and strong intermolecular force is easily formed rapidly with the adherend, so that firm adhesion is rapidly formed between the adhesive and the adherend. When the content of VA is increased, the viscosity and the toughness of the adhesive are increased, but the fluidity of the adhesive is correspondingly reduced, and when the content of VA is 15-25%, the prepared adhesive has high viscosity and fluidity.
(2) By combining the examples 1 and 4-6 and the table 3, the SEBS elastomer and the paraffin oil are matched, so that the prepared adhesive has more excellent initial peel strength, normal-temperature peel strength and low-temperature peel strength, and the peel strength is reduced due to the lack of any component; meanwhile, in the test process, the label warpage phenomenon appears in the example 5 without adding paraffin oil under a low-temperature environment, and the label degumming phenomenon appears in the examples 4 and 6 without adding SEBS elastomer under the low-temperature environment.
The reason for the above phenomenon may be that the SEBS elastomer has high compatibility with PP and PE and good wettability, and when the adhesive is melted at high temperature for bonding, the SEBS elastomer can generate mutual diffusion with PP and PE polymers (yogurt cup material) through brownian motion of molecules or motion of chain segments, thereby forming a more compact bonding structure. Meanwhile, paraffin oil is a small molecular substance and can enter between molecular chains of the SEBS, so that the distance between the molecular chains of the SEBS is increased, the adsorption point between the paraffin oil and an adhered object is increased, the improvement of the viscosity between the adhesive and the surface of the adhered object is facilitated, and finally the initial peeling strength between the adhesive and the adhered object and the strength of normal-temperature glass are enhanced.
In addition, the SEBS elastomer has an excellent toughening effect, can effectively reduce the rigidity of the adhesive, and prevents the adhesive from hardening and becoming brittle when being refrigerated at low temperature (-15 to-18 ℃), so that the viscosity of the adhesive is kept at low temperature, and the label is prevented from warping and even being degummed.
(3) By combining the embodiments 1 and 7-9 and combining the table 3, it can be seen that the adhesive prepared by using the terpene resin and the maleic anhydride together has more excellent initial peel strength, normal-temperature peel strength and low-temperature peel strength, and the terpene resin alone cannot improve the peel strength, but rather causes the peel strength to decrease; meanwhile, in the test process, the samples 7 to 9, to which no terpene resin or maleic anhydride was added, all showed severe label warpage in a low temperature environment.
The reason for the above phenomenon may be that, because the terpene resin contains a large amount of polar groups, on one hand, the polar groups can generate hydrogen bond force with the surface of the adhered object, so as to enhance the adhesion between the adhesive and the adhered object, and at the same time, can compensate the reduction of viscosity caused by the reduction of molecular force between the adhesive and the adhered object under low temperature environment; on the other hand, a network structure can be formed among polar terpene resins, so that micromolecule substances such as paraffin oil, paraffin and the like are firmly fixed in the adhesive, the tendency of migration of the micromolecule substances to an adhesive interface caused by compatibility problems is inhibited, and the adhesive strength of the interface is guaranteed. Further, since petroleum resins and rosin resins are nonpolar resins and have poor compatibility with terpene resins, resulting in poor resin dispersibility and difficulty in developing a tackifying effect of the resins, maleic anhydride needs to be added in the present application to improve compatibility between the polar resins and the nonpolar resins and to promote dispersion of various tackifying resins, and finally, to improve initial peel strength, normal temperature peel strength and low temperature peel strength.
(4) By combining the examples 1 and 10 to 11 and combining the table 3, it can be seen that the increase of the dosage of the hydrogenated rosin resin is beneficial to the increase of the normal temperature glass strength of the adhesive. Meanwhile, during the test, the adhesive of example 11 has a strong and pungent rosin odor, while the rosin odor of example 10 and example 1 is very little pungent.
(5) As can be seen by combining examples 1 and 12-15 and table 3, the adhesive prepared by using petroleum resin and rosin resin in the weight ratio of 1 (3-4) is beneficial to balancing the initial peel strength and the normal-temperature peel strength of the adhesive and an adherend, and the C5 petroleum resin is preferably used to obtain more excellent initial peel strength, so that the time for the label to form firm adhesion to the adherend is shortened. The reason for this may be that rosin resin has more excellent tackifying effect, while petroleum resin has more excellent initial tack and petroleum resin has less odor. Therefore, the petroleum resin and the rosin resin in a proper proportion are adopted, so that the initial peel strength and the normal-temperature peel strength of the adhesive are balanced.
Further, since the initial viscosity of the C5 petroleum resin is higher than that of other petroleum resins, 5 petroleum resin is preferably used in the present application.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (2)
1. The glue for the label of the yoghourt packaging cup is characterized by being prepared by melting and mixing the following raw materials in percentage by weight:
tackifying resin: 25-35%;
ethylene-vinyl acetate copolymer: 40-48%;
SEBS elastomer: 3-5%;
softening agent: 10-25%;
antioxidant: 0.1-1%;
the melt index of the ethylene-vinyl acetate copolymer is more than 150g/10min, and the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 15-25%;
the softening agent is a composition of paraffin oil and paraffin wax in a weight ratio of 1 (3-5), the melting point of the paraffin wax is 70-90 ℃, and the paraffin oil is light paraffin oil;
the tackifying resin comprises the following components in percentage by weight:
petroleum resin: 4-7%;
rosin resin: 18-22%;
terpene resin: 2-4%;
maleic anhydride: 1-2%;
the rosin resin consists of (7-9) to (11-13) of rosin resin and modified rosin resin in a weight ratio, wherein the modified rosin resin is hydrogenated rosin resin;
the production method of the glue for the label of the yoghourt packaging cup comprises the following steps:
s1, adding a softening agent at 120-130 ℃, heating to 140-150 ℃ within 5-10 min, adding 4-7 wt% of tackifying resin, melting and mixing uniformly, and mixing for 15-20 min to obtain a first mixed phase;
s2, adding 2/3 elastomer into the first mixed phase, carrying out melt mixing for 5-10 min, adjusting the temperature to 150-160 ℃, adding the rest elastomer, and mixing for 30-40 min to obtain a second mixed phase;
s3, adding 11-13 wt% of tackifying resin into the second mixed phase at the temperature of 150-160 ℃, fully mixing, adding ethylene-vinyl acetate copolymer after 10-15 min, and melting and uniformly mixing to obtain a third mixed phase;
s4, adding the ethylene-vinyl acetate copolymer obtained in the step S3 into the mixture at the temperature of 150-160 ℃ for 10-20 min, adding the rest tackifying resin and antioxidant into the third mixed phase, melting and mixing uniformly, pressurizing to 0.2-0.3 MPa after 15-20 min, discharging, and granulating and cooling to obtain finished product particles;
in step S1, a petroleum resin is used as the tackifier resin; in step S2, the elastomer is an SEBS elastomer; in step S3, the tackifying resin is a modified rosin resin; in step S4, the tackifying resin is a mixture of rosin resin, terpene resin and maleic anhydride.
2. The glue for yoghourt packaging cup labels as claimed in claim 1, wherein the petroleum resin is C5 petroleum resin, and the weight ratio of the petroleum resin to the rosin resin is 1 (3-4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110786831.6A CN113429910B (en) | 2021-07-12 | 2021-07-12 | Glue for label of yoghourt packaging cup and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110786831.6A CN113429910B (en) | 2021-07-12 | 2021-07-12 | Glue for label of yoghourt packaging cup and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113429910A CN113429910A (en) | 2021-09-24 |
| CN113429910B true CN113429910B (en) | 2022-06-14 |
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| CN202110786831.6A Active CN113429910B (en) | 2021-07-12 | 2021-07-12 | Glue for label of yoghourt packaging cup and production method thereof |
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| CN (1) | CN113429910B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1351104A (en) * | 2000-10-26 | 2002-05-29 | 中国石油化工股份有限公司 | Hot fusible adhesive for package |
| JP2012255084A (en) * | 2011-06-09 | 2012-12-27 | Toyo Adl Corp | Thermally peelable aqueous adhesive |
| JP2017186487A (en) * | 2016-04-08 | 2017-10-12 | 積水フーラー株式会社 | Hot melt adhesive, tape and label product using the same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101444490B1 (en) * | 2007-02-06 | 2014-09-24 | 미쓰비시 쥬시 가부시끼가이샤 | Thermally shrinkable film, molded article and thermally shrinkable label both using the thermally shrinkable film, and container using the molded article or having the label attached thereon |
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2021
- 2021-07-12 CN CN202110786831.6A patent/CN113429910B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1351104A (en) * | 2000-10-26 | 2002-05-29 | 中国石油化工股份有限公司 | Hot fusible adhesive for package |
| JP2012255084A (en) * | 2011-06-09 | 2012-12-27 | Toyo Adl Corp | Thermally peelable aqueous adhesive |
| JP2017186487A (en) * | 2016-04-08 | 2017-10-12 | 積水フーラー株式会社 | Hot melt adhesive, tape and label product using the same |
Non-Patent Citations (1)
| Title |
|---|
| SEBS对EVA树脂性能影响的研究;马秀峰等;《中国石油化工标准与质量》;20140525;第20、22页 * |
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| CN113429910A (en) | 2021-09-24 |
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