CN104962147A - Poaching-resistant polyvinyl alcohol coating and preparation method thereof - Google Patents
Poaching-resistant polyvinyl alcohol coating and preparation method thereof Download PDFInfo
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- CN104962147A CN104962147A CN201510385777.9A CN201510385777A CN104962147A CN 104962147 A CN104962147 A CN 104962147A CN 201510385777 A CN201510385777 A CN 201510385777A CN 104962147 A CN104962147 A CN 104962147A
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Abstract
The invention relates to a poaching-resistant polyvinyl alcohol coating and a preparation method thereof. The coating is prepared from the following raw materials in percentages by weight: 7.2% to 11.5% of polyvinyl alcohol, 0.4% to 0.7% of nano hydrotalcite, 0.5% to 1.4% of polyacrylamide, 0.01% to 0.015% of catalyst, 0.01% to 0.02% of surfactant, 0.005% to 0.008% of defoaming agent, and 87.4% to 91.4% of deionized water. Such a coating has quite good water resistance, after being coated on a base material as a blocking coating layer and being compounded, is applicable to poaching resistance, does not wrinkle on surfaces, further, is safe and environment-friendly, and is lower in production cost, and the application range of a polyvinyl alcohol coating film is broadened.
Description
Art
The present invention relates to a kind of water boiling resistance polyvinyl alcohol coating and preparation method thereof, belong to novel environment friendly polymeric material field.
Background technology
The sterilization of high temperature poach is a kind of method of conventional prolongation effective period of food quality, is usually used in the packaging such as meat, prepared food.But because high temperature poach condition is harsh, the bag that rises usually occurred in poach process, broken bag, peculiar smell, delamination, surface wrinkling, crimping, leak gas, occur the problems such as pin hole.At present, when selecting high temperature poach bag material, except overcoming the above problems, safety and environmental protection, low cost, excellent barrier property and shelf-life can be extended better become the technical parameter that first manufacturer consider.
Food packaging industry has developed the PVDC coated film possessing high temperature water boiling resistance function at present, and the most Gao Kenai of the PVDC coated film as manufactured in patent application 201210294409.X is thirty minutes long the high temperature poach of 135 DEG C, and non-whitening is non-yellowing.But owing to easily producing the carcinogenic substances such as dioxin after PVDC material combustion, a lot of country starts the use limiting PVDC material in succession.Again because polyvinyl alcohol has very high blocking oxygen performance, and environmentally safe, only remaining carbonic acid gas and water after burning, therefore, popular as a kind of desirable high-barrier packaging material.But containing great amount of hydroxy group in polyvinyl alcohol structures, the easy moisture absorption, and unmodified polyvinyl alcohol is in water temperature more than 85 DEG C i.e. solubilized, prior art concentrates on improves water resistance, even cannot meet the requirement of high temperature water boiling resistance.
Summary of the invention
For the problems referred to above that existing polyvinyl alcohol coating exists, the object of the present invention is to provide a kind of water boiling resistance polyvinyl alcohol coating, this kind of coating has extraordinary water resistance, coats base material and after compound as barrier coat, be applicable to water boiling resistance, surface is wrinkle resistant.Innovative point of the present invention is: first by adding polyacrylamide and nano hydrotalcite carries out reasonable compatibility in polyvinyl alcohol, not only increasing the adhesive property of coating, improve the resistance to elevated temperatures of polyvinyl alcohol coating simultaneously.Through test, as shown in table 1, water boiling resistance polyvinyl alcohol composite coating film, after 120 DEG C of poach 45min, stripping strength still remains on 1.6-2.0N/15mm, and water boiling resistance polyvinyl alcohol glue spread is only 0.6-0.8g/m
2oTR oxygen transmission rate can be low to moderate 0.3-0.6ml/m
2.24h, compare with after conventional polyvinyl alcohol composite coating film (make polyvinyl alcohol coating according to patent application 201110197929.4, then be coated with compound) poach, stripping strength and oxygen resistance all have and significantly improve.In addition, by individually adding polyacrylamide and nano hydrotalcite (polyacrylamide in conventional type polyvinyl alcohol coating, the adding proportion of nano hydrotalcite is identical with its corresponding ratio of polyvinyl alcohol in water boiling resistance type of the present invention) test result contrasts known, after independent interpolation polyacrylamide, stripping strength after coating compound has brought up to 0.5-0.7N/15mm from 0.2-0.3N/15mm, oxygen barrier property is not almost improved, independent interpolation nano hydrotalcite after being coated with compound, stripping strength does not almost improve, OTR oxygen transmission rate is from 10.0-12.1ml/m
2.24h 4.3-5.7ml/m is down to
2.24h, promote to some extent.That is, add polyacrylamide or nano hydrotalcite separately, water boiling resistance and high obstructing performance requirement cannot be met simultaneously.Therefore creatively add polyacrylamide and nano hydrotalcite in the present invention simultaneously, reach extraordinary synergy, finally made water boiling resistance high-barrier polyvinyl alcohol coating.This coating safety and environmental protection, production cost are lower, have widened the range of application of polyvinyl alcohol coated film.
Performance comparison after table 1. conventional type and water boiling resistance type polyvinyl alcohol composite coating film poach
Note: composite structure is BOPP19//primer // polyethylene coating // composite gum //CPP30, coating primer spread is 1.5g/m
2, polyvinyl alcohol glue spread is 0.6-0.8g/m
2, composite gum spread is 2g/m
2.Conventional type is for obtain polyvinyl alcohol composite coating film according to patent application 201110197929.4, and water boiling resistance type is for obtain polyvinyl alcohol composite coating film according to the present invention, and except difference prepared by coating, follow-up coating process, condition and glue spread are all identical.
The invention provides a kind of water boiling resistance polyvinyl alcohol coating, described water boiling resistance polyvinyl alcohol coating is become by the preparation of raw material containing following weight content: 7.2-11.5% polyvinyl alcohol, 0.4-0.7% nano hydrotalcite, 0.5-1.4% polyacrylamide, 0.01-0.015% catalyzer, 0.01-0.02% tensio-active agent, 0.005-0.008% defoamer, 87.4-91.4% deionized water.
The described polyvinyl alcohol polymerization degree is 1700, and alcoholysis degree is 88%;
Described nano hydrotalcite particle diameter is 400-600nm;
Described polyacrylamide is anionic, 100-150 order white powder;
Described catalyzer is citric acid, the one of tosic acid or arbitrary combination;
Described tensio-active agent is sodium lauryl sulphate, the one of sodium laurylsulfonate or combination;
Described defoamer is silicone antifoam agent.
Present invention also offers a kind of preparation method of water boiling resistance polyvinyl alcohol coating, the method is: first 87.4-91.4% deionized water is heated to 85-100 DEG C, open and stir, stirring velocity is set as 300 revs/min, add 7.2-11.5% polyvinyl alcohol again, 0.005-0.008% defoamer is added after dissolving, be cooled to 40 DEG C, add 0.01-0.02% tensio-active agent again, Keep agitation closed whipping appts after 1 hour, add the nano hydrotalcite of 0.4-0.7% nano hydrotalcite again, ultrasonic oscillation makes crystal fully disperse.Dropwise and be warming up to 60 DEG C of constant temperature 1 hour, again add the catalyzer of 0.01-0.015% and the polyacrylamide of 0.5-1.4%, constant temperature 2 hours, opens whipping appts again, fully stirs 1 hour, filters discharging after dropping to room temperature.
Embodiment
Embodiment one:
First 45.3285 kilograms of deionized waters are heated to 85 DEG C, open whipping appts, stirring velocity is set as 300 revs/min, add 3.6 kilograms of polyvinyl alcohol again, add 0.004 kilogram of silicone antifoam agent after dissolving, be cooled to 40 DEG C, add 0.01 kilogram of sodium laurylsulfonate again, Keep agitation closed whipping appts after 1 hour, then added the nano hydrotalcite of 0.35 kilogram of nano hydrotalcite, and ultrasonic oscillation makes crystal fully disperse.Dropwise and be warming up to 60 DEG C of constant temperature 1 hour, again add the citric acid of 0.0075 kilogram and the polyacrylamide of 0.7 kilogram, constant temperature 2 hours, opens whipping appts again, fully stirs 1 hour, filters discharging after dropping to room temperature.Be coated with through upper machine by obtained coating, base material is the BOPP light film of 19 μm, and glue spread is 0.8g/m
2, lower machine solidifies that within 48 hours, to test its OTR oxygen transmission rate be 0.6ml/m
2.24h, stripping strength is 1.8N/15mm.
Embodiment two:
First 67.995 kilograms of deionized waters are heated to 90 DEG C, open whipping appts, stirring velocity is set as 300 revs/min, add 5.625 kilograms of polyvinyl alcohol again, add 0.00525 kilogram of silicone antifoam agent after dissolving, be cooled to 40 DEG C, add 0.015 kilogram of sodium lauryl sulphate again, Keep agitation closed whipping appts after 1 hour, then added the nano hydrotalcite of 0.45 kilogram of nano hydrotalcite, and ultrasonic oscillation makes crystal fully disperse.Dropwise and be warming up to 60 DEG C of constant temperature 1 hour, again add the tosic acid of 0.00975 kilogram and the polyacrylamide of 0.9 kilogram, constant temperature 2 hours, opens whipping appts again, fully stirs 1 hour, filters discharging after dropping to room temperature.Be coated with through upper machine by obtained coating, base material is the BOPP light film of 19 μm, and glue spread is 0.8g/m
2, lower machine solidifies that within 48 hours, to test its OTR oxygen transmission rate be 0.5ml/m
2.24h, stripping strength is 1.9N/15mm.
Embodiment three:
First 112.9625 kilograms of deionized waters are heated to 100 DEG C, open whipping appts, stirring velocity is set as 300 revs/min, add 9.75 kilograms of polyvinyl alcohol again, add 0.0075 kilogram of silicone antifoam agent after dissolving, be cooled to 40 DEG C, add 0.0125 kilogram of sodium laurylsulfonate again, Keep agitation closed whipping appts after 1 hour, then added the nano hydrotalcite of 0.625 kilogram of nano hydrotalcite, and ultrasonic oscillation makes crystal fully disperse.Dropwise and be warming up to 60 DEG C of constant temperature 1 hour, again add the tosic acid of 0.0175 kilogram and the polyacrylamide of 1.625 kilograms, constant temperature 2 hours, opens whipping appts again, fully stirs 1 hour, filters discharging after dropping to room temperature.Be coated with through upper machine by obtained coating, base material is the BOPP light film of 19 μm, and glue spread is 0.6g/m
2, lower machine solidifies that within 48 hours, to test its OTR oxygen transmission rate be 0.3ml/m
2.24h, stripping strength is 1.6N/15mm.
Embodiment four:
First 135.987 kilograms of deionized waters are heated to 98 DEG C, open whipping appts, stirring velocity is set as 300 revs/min, add 12 kilograms of polyvinyl alcohol again, add 0.0105 kilogram of silicone antifoam agent after dissolving, be cooled to 40 DEG C, add 0.03 kilogram of sodium lauryl sulphate again, Keep agitation closed whipping appts after 1 hour, then added the nano hydrotalcite of 0.6 kilogram of nano hydrotalcite, and ultrasonic oscillation makes crystal fully disperse.Dropwise and be warming up to 60 DEG C of constant temperature 1 hour, again add the citric acid of 0.0225 kilogram and the polyacrylamide of 1.35 kilograms, constant temperature 2 hours, opens whipping appts again, fully stirs 1 hour, filters discharging after dropping to room temperature.Be coated with through upper machine by obtained coating, base material is the BOPP light film of 19 μm, and glue spread is 0.6g/m
2, lower machine solidifies that within 48 hours, to test its OTR oxygen transmission rate be 0.4ml/m
2.24h, stripping strength is 2.0N/15mm.
Embodiment five:
First 176.938 kilograms of deionized waters are heated to 89 DEG C, open whipping appts, stirring velocity is set as 300 revs/min, add 20 kilograms of polyvinyl alcohol again, add 0.016 kilogram of silicone antifoam agent after dissolving, be cooled to 40 DEG C, add 0.02 kilogram of sodium laurylsulfonate again, Keep agitation closed whipping appts after 1 hour, then added the nano hydrotalcite of 0.8 kilogram of nano hydrotalcite, and ultrasonic oscillation makes crystal fully disperse.Dropwise and be warming up to 60 DEG C of constant temperature 1 hour, again add the tosic acid of 0.026 kilogram and the polyacrylamide of 2.2 kilograms, constant temperature 2 hours, opens whipping appts again, fully stirs 1 hour, filters discharging after dropping to room temperature.Be coated with through upper machine by obtained coating, base material is the BOPP light film of 19 μm, and glue spread is 0.8g/m
2, lower machine solidifies that within 48 hours, to test its OTR oxygen transmission rate be 0.6ml/m
2.24h, stripping strength is 1.7N/15mm.
Embodiment six:
First 218.65 kilograms of deionized waters are heated to 85 DEG C, open whipping appts, stirring velocity is set as 300 revs/min, add 28.75 kilograms of polyvinyl alcohol again, add 0.015 kilogram of silicone antifoam agent after dissolving, be cooled to 40 DEG C, add 0.05 kilogram of sodium lauryl sulphate again, Keep agitation closed whipping appts after 1 hour, then added the nano hydrotalcite of 1.25 kilograms of nano hydrotalcites, and ultrasonic oscillation makes crystal fully disperse.Dropwise and be warming up to 60 DEG C of constant temperature 1 hour, again add the citric acid of 0.035 kilogram and the polyacrylamide of 1.25 kilograms, constant temperature 2 hours, opens whipping appts again, fully stirs 1 hour, filters discharging after dropping to room temperature.Be coated with through upper machine by obtained coating, base material is the BOPP light film of 19 μm, and glue spread is 0.7g/m
2, lower machine solidifies that within 48 hours, to test its OTR oxygen transmission rate be 0.3ml/m
2.24h, stripping strength is 1.9N/15mm.
Embodiment seven:
First 264.816 kilograms of deionized waters are heated to 93 DEG C, open whipping appts, stirring velocity is set as 300 revs/min, add 31.5 kilograms of polyvinyl alcohol again, add 0.015 kilogram of silicone antifoam agent after dissolving, be cooled to 40 DEG C, add 0.03 kilogram of sodium laurylsulfonate again, Keep agitation closed whipping appts after 1 hour, then added the nano hydrotalcite of 1.2 kilograms of nano hydrotalcites, and ultrasonic oscillation makes crystal fully disperse.Dropwise and be warming up to 60 DEG C of constant temperature 1 hour, again add the tosic acid of 0.039 kilogram and the polyacrylamide of 2.4 kilograms, constant temperature 2 hours, opens whipping appts again, fully stirs 1 hour, filters discharging after dropping to room temperature.Be coated with through upper machine by obtained coating, base material is the BOPP light film of 19 μm, and glue spread is 0.7g/m
2, lower machine solidifies that within 48 hours, to test its OTR oxygen transmission rate be 0.5ml/m
2.24h, stripping strength is 1.8N/15mm.
Claims (10)
1. a water boiling resistance polyvinyl alcohol coating, is characterized in that: it is become by the preparation of raw material containing following weight content: 7.2-11.5% polyvinyl alcohol, 0.4-0.7% nano hydrotalcite, 0.5-1.4% polyacrylamide, 0.01-0.015% catalyzer, 0.01-0.02% tensio-active agent, 0.005-0.008% defoamer, 87.4-91.4% deionized water.
2. a kind of water boiling resistance polyvinyl alcohol coating according to claim 1, it is characterized in that: the described polyvinyl alcohol polymerization degree is 1700, alcoholysis degree is 88%.
3. a kind of water boiling resistance polyvinyl alcohol coating according to claim 1, is characterized in that: described nano hydrotalcite particle diameter is 400-600nm.
4. a kind of water boiling resistance polyvinyl alcohol coating according to claim 1, is characterized in that: described polyacrylamide is anionic, 100-150 object white powder.
5. a kind of water boiling resistance polyvinyl alcohol coating according to claim 1, is characterized in that: described catalyzer is citric acid, the one of tosic acid or combination.
6. a kind of water boiling resistance polyvinyl alcohol coating according to claim 1, is characterized in that: described tensio-active agent is sodium lauryl sulphate, the one of sodium laurylsulfonate or combination.
7. a kind of water boiling resistance polyvinyl alcohol coating according to claim 1, is characterized in that: described defoamer is silicone antifoam agent.
8. the preparation method of water boiling resistance polyvinyl alcohol coating according to claim 1, it is characterized in that: first 87.4-91.4% deionized water is heated to 85-100 DEG C, open and stir, stirring velocity is set as 300 revs/min, add 7.2-11.5% polyvinyl alcohol again, 0.005-0.008% defoamer is added after dissolving, be cooled to 40 DEG C, add 0.01-0.02% tensio-active agent again, Keep agitation closed whipping appts after 1 hour, add the nano hydrotalcite of 0.4-0.7% nano hydrotalcite again, ultrasonic oscillation makes crystal fully disperse, dropwise and be warming up to 60 DEG C of constant temperature 1 hour, again add the catalyzer of 0.01-0.015% and the polyacrylamide of 0.5-1.4%, constant temperature 2 hours, again open whipping appts, abundant stirring 1 hour, discharging is filtered after dropping to room temperature.
9. the purposes of a kind of water boiling resistance polyvinyl alcohol coating according to claim 1, is characterized in that: for food product pack coating.
10. by the packaging material for food that a kind of water boiling resistance polyvinyl alcohol coating according to claim 1 is obtained.
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Cited By (2)
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| CN105647304A (en) * | 2016-04-06 | 2016-06-08 | 攀钢集团矿业有限公司 | Environment-friendly and flame-retardant coating, preparation method thereof and environment-friendly and flame-retardant coating layer |
| CN110318291A (en) * | 2019-06-26 | 2019-10-11 | 海南必凯水性新材料有限公司 | It is a kind of for being coated with the aqueous barrier coating of paper |
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| CN110318291A (en) * | 2019-06-26 | 2019-10-11 | 海南必凯水性新材料有限公司 | It is a kind of for being coated with the aqueous barrier coating of paper |
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