CN1687282A - Hot-melt adhesive possible to be coated at low temperature - Google Patents
Hot-melt adhesive possible to be coated at low temperature Download PDFInfo
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- CN1687282A CN1687282A CN 200510033893 CN200510033893A CN1687282A CN 1687282 A CN1687282 A CN 1687282A CN 200510033893 CN200510033893 CN 200510033893 CN 200510033893 A CN200510033893 A CN 200510033893A CN 1687282 A CN1687282 A CN 1687282A
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Abstract
The present invention relates to a thermal melt adhesive which can be coated at low temperature. It contains at least a thermoplastic rubber whose melt index is greater than 12g/10min, plasticizer, tack-product resin and antioxidant. The Brabender viscosity of said thermal melt adhesive when which is being at 130 deg.C is less than 2000 cps, so that said thermal melt adhesive can be coated for use below 120 deg.C. Said thermal melt adhesive mainly can be used as positioning adhesive for disposable sanitary product.
Description
Invention field
The present invention relates to a kind of hot melt adhesive, particularly a kind of hot melt adhesive that can be low temperature coated belongs to the macromolecule product manufacture field.
Background technology
In the production of disposable sanitary product, common hot melt adhesive at high temperature (about 130 ℃~180 ℃) is applied on the workpiece, it mainly plays the function of two aspects: 1) structure glue, be hot melt adhesive fully during refrigerative the marquis different or identical materials are fixed together, these materials comprise polyethylene film, non-woven fabrics, thieving paper, wood pulp etc.The example of this purposes comprises the making of paper diaper, the making of operating coat etc.; 2) gum or location glue, i.e. hot melt adhesive directly or on certain base material of transfer coating, and another side only covers with separate-type paper, tears separate-type paper and still can paste other base materials after hot melt adhesive cools off fully.The example of this purposes comprises sanitary napkin, protection pad, medical adhesive tape etc.
In the production of disposable sanitary product, the coating method of hot melt adhesive has direct blade coating, shifts multiple modes such as blade coating, spiral spraying, fiber coating, lines spraying.In the above-mentioned coating method, the temperature of hot melt adhesive generally is controlled between 130 ℃~180 ℃, but because the fusing point of polyethylene film is approximately about 125 ℃, the fusing point of typical polypropylene non-woven fabric is roughly 165 ℃, therefore hot melt adhesive can cause the material of above-mentioned disposable sanitary product phenomenons such as wearing, scald wrinkle to occur being scalded after coating, and these phenomenons are especially even more serious when the coating method of direct blade coating.Simultaneously, high coating temperature also can cause adverse consequencess such as energy consumption increase, service life of a machine shortening, hot melt adhesive carbonization quickening in the production process.Therefore, invent a kind of can the needs by low temperature coated hot melt adhesive.
Under the working condition of disposable sanitary product, the suitable working viscosity of hot melt adhesive is between 500~10000cps (being centipoise).Because there is reverse interdependence in the viscosity temperature residing with it of hot melt adhesive, promptly high viscosity is low more more for temperature, and temperature low viscosity more is high more, thereby to invent a kind of key that can low temperature coated hot melt adhesive be its viscosity under specific use temperature of reduction.
Summary of the invention
The objective of the invention is to avoid above-mentioned weak point of the prior art and provide a kind of in the time of 130 ℃ brookfield viscosity less than 2000cps, can be at the hot melt adhesive of coating below 120 ℃, and kept prerequisite other performance of hot melt adhesive simultaneously as disposable sanitary articles, as stripping strength, lower temperature resistance etc.
Purpose of the present invention can reach by following measure: a kind of hot melt adhesive that can be low temperature coated, and its component and weight percent are:
Thermoplastic elastomer: 10~25
Tackifying resin: 30~70
Thinner: 10~45
Oxidation inhibitor: 0~3
Purpose of the present invention can also reach by following measure: hot melt adhesive preferred prescription by weight percentage is:
Thermoplastic elastomer 10-20
Tackifying resin 40-60
Softening agent 20-40
Oxidation inhibitor 0.2-1.5;
Thermoplastic elastomer is selected from one or more of following product: structure formation is the A-B-A triblock copolymer, A-B Synthetic rubber, isoprene-styrene, hydrogenated, block, diblock, A-C-B-A Tetrablock copolymer, A-B-AB-A-B segmented copolymer, star block copolymer and they connect technological transformation product and above-mentioned these mixture of polymers.Tackify knot fat is selected from aliphatic hydrocarbon, finger ring family hydrocarbon, aromatic hydrocarbons etc., and the hydrocarbon resin of modification and hydrogenated derivatives, terpenes and hydrogenated derivatives thereof, the rosin of rosin and modification and hydrogenated derivatives thereof, and the mixture of these compounds; Softening agent is selected from mineral base hydrocarbon-type oil, petroleum base hydrocarbon-type oil, polybutene, polyisobutene liquid tackifiers resin, liquid elastomer, functionalized oil, fatty wet goods and their mixture; Oxidation inhibitor be selected from hindered phenol or with aid anti-oxidants bonded hindered phenol.
In the above-mentioned thermoplastic elastomer of the present invention, to select for use a kind of melting index (190 ℃/5 kilograms tests, as follows) at least greater than 12g/10 minute above-mentioned polymkeric substance.A refers in particular to vinylbenzene in the above-mentioned expression formula, and C refers in particular to ethene, and B represents divinyl, isoprene or pentadiene.These examples as the segmented copolymer that thermoplastic elastomer uses are a lot, and some examples comprise the Kraton that obtains from U.S. shell chemical company
TMThe polymkeric substance of G system example.These polymkeric substance can use separately, perhaps use with the form of any mixture.
The molecular weight of above-mentioned thermoplastic elastomer generally characterizes by testing its melting index.The melting index of rubber is big more, shows that its molecular weight is less, and fluidity of molten is good, and vice versa.Therefore one of main points of hot melt adhesive of the present invention are the thermoplastic elastomer of selecting melting index bigger.The melting index of selecting at least a thermoplastic elastomer in the present invention was preferably greater than 15g/10 minute greater than 12g/10 minute.The weight percent preferred amounts of thermoplastic elastomer is 10%~20% in the present invention.Also comprise in the hot melt adhesive of the present invention and the compatible tackifying resin of above-mentioned thermoplastic elastomer mid-block.Representational resin comprises C
5Petroleum resin, C
9Petroleum resin, C
5/ C
9Petroleum resin, terpine resin, rosin, rosin ester etc., and the hydrogenation of above-mentioned resin or modifier.Can select the mixture of two or more above-mentioned tackifying resins for use to some prescription.Preferred tackifying resin is hydrogenation or semihydrogenation C
5Petroleum resin, C
5/ C
9Petroleum resin; Melt Gardner colorimetric is less than terpine resin, terpenes styrene resin and the rosin ester of No. 6 looks.The ring and ball softening point of preferred tackifying resin is between 90 ℃~110 ℃.The preferred amounts of tackifying resin is 40%~60% in the present invention.
Suitable manufacturing methods of the present invention comprises olefin oligomer and low-molecular weight polymer, also has vegetables oil and animal oil and derivative thereof.Adoptable petroleum derivative is to contain the very high boiling point material of small proportion aromatic hydrocarbon (preferably less than 15% weight ratio).On the other hand, softening agent oil can be non-aromatic fully.Suitable oligopolymer comprises that molecular-weight average is about polypropylene of 350~about 10000, polybutene, poly-isoamyl two hydrocarbon, polyhutadiene, polyisobutene or analogue, and liquid tackifying resin.The example of the softening agent that is suitable for comprises KN4010, KN4008, the KN4012 of Kelamayi company etc.Softening agent preferred amounts among the present invention is 20-40%.
Also contain 0~3% oxidation inhibitor in the hot melt adhesive of the present invention, preferred content is 0.2%~1.5%.Spendable stablizer of the present invention or oxidation inhibitor comprise the Hinered phenols material, they can use separately, also can help antioxidant to use jointly with phosphorous acid ester, sulfuration dipropionic acid SUNSOFT Q-182S, sulfuration dipropionic acid dilaurate etc., typical example be the Irganox that Ciba company provides
TM1010 and Irganox
TM1076.Many other oxidation inhibitor can obtain.Add these oxidation inhibitor and be the degraded that oxidizing reaction caused, but these oxidation inhibitor do not influence the physicals of hot melt adhesive substantially in order to slow down hot melt adhesive and heat, light or to produce from the residual catalyzer in the starting material.
Can add other compounds that do not influence its physicals in the hot melt adhesive of the present invention.These chemicals comprise compound, ultraviolet absorbers and the filler etc. of the pigment that increases color, fluorescent agent, any masking odors.The compound of these compounds is that the person skilled in the art is known in this field.
Hot melt adhesive of the present invention can be used as the location glue and the structure glue of various disposable sanitary products and uses.Described disposable sanitary product includes but not limited to product and analogues such as sanitary napkin, sanitary pad, baby paper diaper, disposable, adult-incontinence goods, disposable surgical clothing, medical bed mattress, medical adhesive tape.
The hot melt adhesive that the present invention obtains, can apply with usual hot melt coating machine under 120 ℃ or lower melt temperature less than 2000cps (cps is a centipoise) 130 ℃ viscosity.130 ℃ of viscosity of preferred thermosol formula are less than 1500cps, can be coated with being low to moderate under 110 ℃ the melting condition.
Low temperature coated hot melt adhesive of the present invention has kept stripping strength that general hot melt adhesive had and softening temperature simultaneously.Hot melt adhesive of the present invention has at least 65 ℃ ring and ball softening point, is preferably greater than 73 ℃, or most preferably greater than 78 ℃.
The present invention has following advantage: improve the quality of products.Save energy consumption and prolong equipment life.
Embodiment:
The present invention does further auspicious stating below in conjunction with embodiment.
The present invention prepares sample with the following step:
Thermoplastic elastomer, oxidation inhibitor and softening agent are joined in the paddle mixer of temperature control about 160 ℃ together, each mixing of materials is stirred until evenly, slowly dose tackifying resin then, and then mixed about 15 minutes.Then the fused hot melt adhesive is poured in the box that folds with separate-type paper, and cool to room temperature.
Use following thermoplastic elastomer:
Table 1
Thermoplastic elastomer | Melting index, g/10 minute | Kind |
??Vector?D-4411 | 33 | ????SIS |
??Kraton?G-1726 | 50 | ????SEBS |
??SIS-1308 | 28 | ????SIS |
??Kraton?G-1652 | 2 | ????SEBS |
??YH-792 | 1.5 | ????SBS |
??Stereon?840A | ????18 | ????(SB)n |
??YH-1209 | ????6 | ????SIS |
Use following tackifying resin:
Table 2
The resin title | Type | Softening temperature ℃ | Gardner's colorimetric | Supplier |
SU-100 | Hydrogenation C5 petroleum resin | 105 | <1# | Korea S Kolon company |
E-5600 | Hydrogenation C5/C9 petroleum resin | 100 | <1# | Exxon Neftegas Limited |
Per100L | The pale rosin pentaerythritol ester | 100 | 2# | Wuzhou day becomes forest products company |
Hot melt adhesive is carried out the mensuration of following performance: viscosity, softening temperature, stripping strength, PE/NW stripping strength, minimum coating temperature to cotton.
Viscosity
Viscosity test carries out unit cps (centipoise) expression in 130 ℃ in the Brookfield viscometer.Softening temperature
Carry out 5 ℃/minute of control heat-up rates with the ring and ball softening point tester.
Stripping strength to cotton
This is the method for test sanitary towel or protection pad gum bonding strength.With the laboratory coating machine that the good company of generation provides, blade coating is on separate-type paper under 150 ℃ of conditions with hot melt adhesive, and pressing to grammes per square metre then is 20g/m
2The polyethylene casting films on.The frictioning gauge control is at 30g/m
2Behind cool to room temperature (23 ℃ ± 2 ℃), one inch of clip gluing width is about 10 centimetres, wide 1 inch sample, peel off separate-type paper, coated face entirely pasted be placed on the standard single jersey that provides by paper for daily use Professional Committee of Chinese papermaking association, single jersey lies on the enough big sheet glass in advance, the counterweight stone roller of a 500g is pressed on single jersey, then this sheet glass is together put into 40 ℃ of constant temperature together with gummed casting films and single jersey, handled one hour in the baking oven of relative temperature 60%~70%.Sample took out in the room be placed on 23 ℃ of constant temperature, relative humidity 60%~70% after 20 minutes, single jersey and casting films are peeled away with 180 degree angles with the speed of 300 mm/min with electronic tensile machine under this environment, the greatest measure of record is the stripping strength of this hot melt adhesive to cotton.
PE/NW peels off degree of heming with invisible stitches
This is the methods of test one sex hygiene goods with the structure glue bonding strength.PE refers to the polyethylene casting films, and NW refers to non-woven fabrics.Selecting grammes per square metre in the experiment of the present invention for use is 20g/m
2Casting films, non-woven fabrics is that grammes per square metre is 18g/m
2The third fine fabric hot rolled nonwoven fabrics.Under 150 ℃ melten gel temperature, the laboratory spreader that provides with the good company of generation with the hot melt adhesive blade coating to nonwoven surface, then in 2 seconds with nonwoven cloth force fit on casting films.The control Amount of spread is 6g/m
2, pressure force is 1kg/cm
2The composite sample of above-mentioned preparation is positioned in the room of 23 ℃ of relative humidity 60%~70% and placed 20 minutes, cut into the test bars of 1 inch wide about 10 cm long then.With electronic tensile machine with the speed of 300 mm/min with the non-woven fabrics of the batten handled well and casting films with 180 angle strip ofves, the greatest measure of record is the stripping strength of this hot melt adhesive to PE/NW.
Minimum coating temperature
The laboratory coating machine that provides with the good company of generation under different melten gel temperature directly with the hot melt adhesive blade coating at 20g/m
2On the polyethylene casting films of grammes per square metre, on coated face, cover separate-type paper then.After treating that the gluing sample at room temperature cools off 1 hour, tear separate-type paper off, the casting films that detects by an unaided eye and coated face do not have the minimum temperature person of scalding in the sample of wearing, scalding wrinkle, glue-coated surface continuously smooth with casting films, are recorded as the minimum coating temperature of this hot melt adhesive.
Embodiment 1
Table 3
Prescription | ????I-1 | ????I-2 | ????I-3 | |||
?Irganox?1010 | ????0.5 | ????0.5 | ????0.5 | |||
?KN4010 | ????30 | ????30 | ????30 | |||
?E-5600 | ????53.5 | ????53.5 | ????53.6 | |||
?D-4411 | ????16 | |||||
?YH-1209 | ????8 | |||||
?YH-792 | ????16 | ????8 | ||||
The test result of formulation product: | ????I-1 | ????I-2 | ????I-3 | |||
130 ℃ of viscosity, cps | ????3400 | ????2800 | ????1600 | |||
Softening temperature, ℃ | ????88 | ????85 | ????85 | |||
To cotton stripping strength, g/in | ????280 | ????420 | ????320 | |||
Minimum coating temperature, ℃ | ????135 | ????127 | ????114 |
I-1 and I-2 are in fact the most real to be the hot melt adhesive of conventional coating temperature.Although its softening temperature and stripping strength are fit to, because their viscosity is higher, all greater than 2000cps, mobile relatively poor, its minimum coating temperature is all greater than 125 ℃ in the time of 130 ℃.And I-3 has been owing to used the big thermoplastic elastomer of melting index, the product of making viscosity in the time of 130 ℃ to have only 1600cps, and minimum coating temperature can be low to moderate 114 ℃, has satisfied the requirement of hot melt adhesive for the low coating temperature of disposable sanitary product well.The gum that above-mentioned three prescriptions all are suitable as sanitary napkin or protection pad uses.
Embodiment 2
Table 4
Prescription | ????II-1 | ????II-2 |
??Irganox?1010 | ????0.5 | ????0.5 |
??Kaydol?oil | ????24 | ????24 |
??Regalite?1010 | ????5 | ????5 |
??G-1652 | ????6 | |
??G-1726 | ????10 | ????10 |
??YH-1209 | ????6 | |
??SU-100 | ????54.5 | ????54.5 |
Test result: 130 ℃ of viscosity, the cps softening temperature, ℃ distich cotton stripping strength, the minimum coating temperature of g/in, ℃ | ????1400 ????87 ????430 ????112 | ????1800 ????84 ????390 ????118 |
Can find out from example 2, use different size instead but at least a melting index greater than 12g/10 minute thermoplastic elastomer and other softening agent and tackifying resin, also can make the low temperature coated hot melt adhesive that satisfactory disposable sanitary product gum uses.
Embodiment 3
Table 5
Prescription | ????III-1 | ????III-2 | ????III-3 |
??Irganox?1010 | ????0.5 | ????0.5 | ????0.5 |
??KN4010 | ????24 | ????24 | ????24 |
??YH-1209 | ????15 | ????7 | |
??YH-792 | ????15 | ||
??SIS-1308 | ????8 | ||
??E-5600 | ????60.5 | ????60.5 | ????60.5 |
Test result: | |||
130 ℃ of viscosity, cps | ????2600 | ????3200 | ????1850 |
Softening temperature, ℃ | ????89℃ | ????91℃ | ????87℃ |
The PE/NW stripping strength, g/in | ????780 | ????750 | ????770 |
Minimum coating temperature | ????128 | ????133 | ????116 |
III-1 and III-2 prescription uses is melting index less than 12g/10 minute thermoplastic elastomer, and they possess the performance of general disposable sanitary product with structure glue, but because 130 ℃ of viscosity height, its minimum coating temperature is still higher.And III-3 fills a prescription owing to used the rubber of a part of high fusion index, and its 130 ℃ of viscosity significantly descend, and minimum coating temperature reaches 116 ℃, has satisfied low temperature coated requirement.
Embodiment 4
Table 6
????1V-1 | ????IV-2 | |
??Irganox?1010 | ????0.5 | ????0.5 |
??Kaydol??oil | ????24 | ????24 |
??Stereon?840A | ????15 | |
??G-1652 | ????6 | |
??SIS-1308 | ????9 | |
??Per?100L | ????60.5 | ????60.5 |
Test result | ||
130 ℃ of viscosity, cps | ????1900 | ????1750 |
Softening temperature, ℃ | ????75 | ????73 |
The PE/NW stripping strength, g/in | ????755 | ????780 |
Minimum coating temperature, ℃ | ????116 | ????114 |
Can find out that from table 6 melting index of using other instead also can obtain the low temperature coated hot melt adhesive of well behaved disposable sanitary articles greater than 12g/10 minute thermoplastic elastomer and other softening agent and tackifying resin.
Claims (10)
- One kind can be low temperature coated hot melt adhesive, it is characterized in that its component and weight percent thereof are:Thermoplastic elastomer: 10~25Tackifying resin: 25~70Softening agent: 10~45Oxidation inhibitor: 0~3.
- One kind can be low temperature coated hot melt adhesive, it is characterized in that the preferred prescription of weight percent is:Thermoplastic elastomer: 10~20Tackifying resin: 40~60Softening agent: 20~40Oxidation inhibitor: 0.2~1.5.
- 3. hot melt adhesive according to claim 1 and 2, it is characterized in that: thermoplastic elastomer is selected from one or more of following product: structure formation is A-B-A triblock copolymer, A-B Synthetic rubber, isoprene-styrene, hydrogenated, block, diblock, A-B-A-B-A-B segmented copolymer, star block copolymer and their graft modification product, and the mixture of above-mentioned these party things.
- 4. hot melt adhesive according to claim 1 and 2, it is characterized in that wherein tackifying resin is selected from the hydrocarbon resin and the hydrogenated derivatives of aliphatic hydrocarbon, clicyclic hydrocarbon, aromatic hydrocarbons etc. and modification, terpenes and hydrogenated derivatives thereof, the rosin of rosin and modification and hydrogenated derivatives thereof, and the mixture of these compounds.
- 5. according to claim 1 or 2 described hot melt adhesives, it is characterized in that softening agent wherein is selected from mineral base hydrocarbon-type oil, petroleum base hydrocarbon-type oil, polybutene, poly-isobutyl hydrocarbon, liquid tackifiers resin, liquid elastomer, functionalized oil, fatty wet goods and their mixture.
- 6. according to claim 1 or 3 described hot melt adhesives, it is characterized in that wherein oxidation inhibitor be selected from hindered phenol or with aid anti-oxidants bonded hindered phenol.
- 7. according to claim 1 or 3 described hot melt adhesives, it is characterized in that: thermoplastic elastomer had a kind of melting index when 190 ℃/5KG (as follows) at least greater than 12g/10 minute when selecting for use.
- 8. tackiness agent according to claim 1 and 2, its brookfield viscosity is less than 2000cps when it is characterized in that 130 ℃.
- 9. hot melt adhesive according to claim 1 and 2, the location glue and the structure glue that it is characterized in that can be used as in the disposable sanitary product are used; Hygienic articles comprises products such as sanitary napkin, protection pad, baby paper diaper, disposable, adult-incontinence articles, operating coat, medical bed mattress, medical adhesive tape.
- 10. according to claim 2 or 8 described hot melt adhesives, it is characterized in that: its brookfield viscosity can be low to moderate under 110 ℃ of melting conditions in temperature and is coated with less than 1500cps when 130 ℃ of preferred prescription.
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