Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a labeling hot melt adhesive and a preparation method thereof. Aims at solving the defect that the existing domestic labeling hot melt adhesive can not reach the performance index requirement of 60000 bottles/h and the holding time is more than 160 days.
In order to achieve the purpose of the invention, the technical scheme adopted is as follows:
the labeling hot melt adhesive comprises the following components in parts by weight:
10-40 parts of thermoplastic elastomer;
10-50 parts of plasticizer;
30-70 parts of tackifying resin;
0.05-2 parts of antioxidant;
the thermoplastic elastomer is an elastomer composition obtained by mixing an SIS block copolymer and an SBS block copolymer;
the mass ratio of the SIS block copolymer to the SBS block copolymer is (0.5-4): 1.
in a preferred embodiment of the invention, the SIS block copolymer has a SIS styrene mass content of 15% to 30%, a diblock content of 0 to 50, and a melt index of 5 to 25g/min. Better transparency and processability are provided by the SIS block copolymers.
In a preferred embodiment of the present invention, the SBS block copolymer has a mass content of SBS styrene of 20% to 40% and a melt index of 5 to 20g/min.
In a preferred embodiment of the invention, the mass ratio of SIS block copolymer to SBS block copolymer is 3:1.
In a preferred embodiment of the present invention, the plasticizer is any one or more of naphthenic oil, white oil, paraffin wax, polybenzimidazole. Naphthenic oils are preferred. Preferably, the plasticizer is added in an amount of 15 to 35 parts.
In a preferred embodiment of the present invention, the tackifying resin is any one or more of a vinyl resin, a phenolic resin, a rosin resin, or a hydrocarbon resin.
Preferably a mixture of hydrocarbon resin and rosin resin, the mixing weight ratio is (1-6): 1.
preferably, the mixing weight ratio is 5:1.
The preferred hydrocarbon resin is one or more of aliphatic hydrocarbon resin (C5), alicyclic hydrocarbon resin (DCPD), aromatic hydrocarbon resin (C9), aliphatic/aromatic copolymerized hydrocarbon resin (C5/C9), C5 hydrogenated hydrocarbon resin, and C9 hydrogenated hydrocarbon resin.
More preferably a C5 hydrogenated hydrocarbon resin having a softening point of 90 to 115℃and a melt viscosity of 200 to 300cps at 190 ℃. The preferred softening point is 95-105℃and melt viscosity is 200-250cps.
The preferred rosin resin has a softening point of 80 to 100℃and an acid value of 3 to 15mgKOH/g. More preferably 85-97deg.C, and an acid value of 5-15mgKOH/g.
In a preferred embodiment of the present invention, the antioxidant is a mixture of antioxidant 1010 and antioxidant 168, and the mixing weight ratio is 0.8-1:1. preferably 0.9-1:1.
A preparation method of a labeling hot melt adhesive comprises the following steps:
and mixing the plasticizer, the tackifying resin and the antioxidant at the temperature of 110-140 ℃ until the mixture is completely melted, heating to 150-170 ℃, adding the thermoplastic elastomer, stirring and mixing for 15-40 minutes at the first time, stirring and mixing for 20-50 minutes at the pressure of-0.1-0.8 Mpa at the second time in vacuum, and discharging to obtain the labeling hot melt adhesive.
In a preferred embodiment of the present invention, the one-time agitation mixing is performed for 20 to 35 minutes.
In a preferred embodiment of the present invention, the secondary stirring and mixing time is 30-40 minutes.
The invention has the beneficial effects that:
the product of the invention can be used as a domestic labeling hot melt adhesive, and can meet the performance index requirements of 60000 bottles/h and more than 160 days of holding time.
Detailed Description
The present invention will be further described in detail with reference to the following examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. In addition, in the following structures, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present invention.
According to the invention, the SBS with the mass content of 20-40% of styrene is selected, so that the high-temperature stability of the quick labeling hot melt adhesive is improved, and the wire drawing is not easy.
By selecting SIS block copolymer and SBS block copolymer with the mass ratio of (0.5-4): 1 as thermoplastic elastomer, the peeling strength of the quick labeling hot melt adhesive is improved.
The selected C5 hydrogenated hydrocarbon resin with the temperature of 95-105 ℃ has strong stability and light color, and is suitable for being applied to high-speed labeling of hot melt adhesives. The rosin resin with the softening point of 85-97 ℃ is selected, and when the mass ratio of the C5 hydrogenated hydrocarbon resin to the rosin resin is (1-6): 1, the initial tackiness and the peel strength can be improved by the synergistic effect between the two. 10-50 parts of naphthenic oil is selected as a plasticizer, so that the wettability of the hot melt adhesive for quick labeling is improved, and further, the peeling strength and the initial viscosity are improved, but if the addition amount is too high, the crosslinking effect of polar groups is affected, and the peeling strength and the initial viscosity are drastically reduced. Preferably 15-35 parts.
The antioxidant is preferably a combination of 1010 and 168, and the compounding of the antioxidant has better synergistic effect.
The present invention will be described in further detail with reference to specific examples.
Embodiments of the invention are as follows:
example 1
The embodiment 1 provides a quick labeling hot melt adhesive, which comprises the following preparation raw materials in parts by weight:
20 parts of thermoplastic elastomer;
50 parts of tackifying resin;
30 parts of plasticizer;
0.5 parts of antioxidant;
the thermoplastic elastomer is an SIS block copolymer and an SBS block copolymer,
the SIS block copolymer is SIS YH-1106 Yueyang Baling petrochemical thermoplastic rubber, the SBS block copolymer is Taiwan rubber SBS 4270 thermoplastic styrene-butadiene rubber, and the mass ratio of the SIS block copolymer to the SBS block copolymer is 2:1.
The tackifying resin is C5 hydrogenated hydrocarbon resin and rosin resin, and the ratio of the C5 hydrogenated hydrocarbon resin to the rosin resin is 5:1
The softening point of the C5 hydrogenated hydrocarbon resin is 90-100 ℃, the melt viscosity is 200-300mpa.s, and the hydrogenated hydrocarbon resin is Wei Caijiao hydrogenated resin H5-1000 which is purchased from the company of He materials science and technology Co.
The softening point of the rosin resin is 80-97 ℃ and the acid value is 5-15mgKOH/g.
The rosin resin is 384T of hot melt pressure-sensitive adhesive series products of Guangdong metallocene forest chemical industry Co.
The naphthenic oil is KN4010 naphthenic oil.
The antioxidant is a composition of antioxidant 1010 and antioxidant 168, and the weight ratio is 1:1.
The preparation method comprises the following steps:
adding plasticizer, tackifying resin and antioxidant into a reaction kettle, setting the temperature to 110 ℃, stirring for 10 minutes after the mixture is melted, heating to 160 ℃, adding SIS and SBS, stirring for 30 minutes, vacuumizing, stirring for 25 minutes, and discharging.
Example 2
Example 2 provides a quick labeling hot melt adhesive, and the specific embodiment is the same as example 1, except that the preparation raw materials include, by weight:
15 parts of thermoplastic elastomer;
55 parts of tackifying resin;
30 parts of plasticizer;
1 part of an antioxidant;
the mass ratio of SIS block copolymer to SBS block copolymer is 3:1.
The ratio of the C5 hydrogenated hydrocarbon resin to the rosin resin is 4:1
The mass ratio of the antioxidant 1010 to the antioxidant 168 is 1:1.
The remainder is the same as in example 1.
Example 3
Example 3 provides a quick labeling hot melt adhesive, and the specific embodiment is the same as example 1, except that the preparation raw materials include, by weight:
35 parts of thermoplastic elastomer;
70 parts of tackifying resin;
32 parts of plasticizer;
1 part of an antioxidant;
the mass ratio of SIS block copolymer to SBS block copolymer is 4:1;
the ratio of the C5 hydrogenated hydrocarbon resin to the rosin resin is 2:1;
the mass ratio of the antioxidant 1010 to the antioxidant 168 is 0.9:1.
The remainder is the same as in example 1.
Comparative example 1
Except that the plasticizer was 55 parts by weight (44% by weight of the total mass), otherwise the same as in example 1.
Comparative example 2
The comparative example is a german hangao EM 362-labelled hot melt adhesive.
Comparative example 3
Except for the fact that the thermoplastic elastomer SIS had a styrene content of 22% and a diblock content of 65%, the same was conducted as in example 2.
The physicochemical properties of the quick labeling hot melt adhesives obtained in examples 1 to 3 and comparative examples 1 to 3 are shown in Table 1
TABLE 1
In the above table, wherein softening point is measured by GB/T4507-2014 and viscosity is measured by GB/T10247-2008 at 150 ℃.
TABLE 2
The hot melt adhesive properties of the high speed labeling obtained in examples 1-3 and comparative examples 1-3 are shown in Table 2
The high-speed labeling hot melt adhesives prepared in examples 1-3 and comparative examples 1-3 were labeled and then placed at 70℃for 24 hours, taken out, and the labels were torn off, and if the labels were broken, they showed good high temperature stability.
And (3) placing the quick labeling hot melt adhesive prepared in the examples 1-3 and the comparative examples at-10 ℃ for 24 hours after labeling, taking out, tearing off the label, and if the label is damaged, breaking the label to show that the low temperature resistance is good.
The hot melt adhesives prepared in examples 1 to 3 and comparative examples 1 to 3 were tested for initial tack with reference to GB/T31125-2014 and the results are reported in Table 2.
As can be seen from the combination of tables 1 and 2, the product of the invention can meet the performance index requirements of 60000 bottles/h and a holding time of more than 160 days as a domestic labeling hot melt adhesive.
Compared with imported performance labeling hot melt adhesives, the cost of the invention is about half of that of the imported performance labeling hot melt adhesives. It can be seen that the invention achieves good domestic substitution.
It will be understood by those skilled in the art that the present invention is not limited to the foregoing embodiments, which have been described in the foregoing embodiments and description merely illustrates the principles of the invention, and that various changes and modifications may be effected therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents.