CN113045847B - Water-soluble packaging film for packaging concentrated laundry detergent - Google Patents

Water-soluble packaging film for packaging concentrated laundry detergent Download PDF

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CN113045847B
CN113045847B CN202110275807.6A CN202110275807A CN113045847B CN 113045847 B CN113045847 B CN 113045847B CN 202110275807 A CN202110275807 A CN 202110275807A CN 113045847 B CN113045847 B CN 113045847B
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water
starch
packaging
film
laundry detergent
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CN113045847A (en
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李运友
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Shandong New Technology Optimization Co.,Ltd.
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
    • C11D17/04—Detergent materials or soaps characterised by their shape or physical properties combined with or containing other objects
    • C11D17/041—Compositions releasably affixed on a substrate or incorporated into a dispensing means
    • C11D17/042—Water soluble or water disintegrable containers or substrates containing cleaning compositions or additives for cleaning compositions
    • C11D17/044—Solid compositions
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
    • C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
    • C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2403/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
    • C08J2403/02—Starch; Degradation products thereof, e.g. dextrin
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2475/04—Polyurethanes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

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Abstract

The invention discloses a water-soluble packaging film for packaging concentrated laundry detergent, which is prepared from the following raw materials in percentage by mass: the solid content of the polyvinyl alcohol PVA-1788 is 12-20 percent; 8 to 15 percent of thickening agent; 10% -40% of a plasticizer; 5% -8% of a surfactant; 0.2 to 0.4 percent of defoaming agent; 3-9% of dissolution rate regulator and the balance of water. The thickening agent is one or more of starch, pectin, arabic gum, guar gum and sodium alginate, and the dissolution rate regulator is one of monoester, diester and triester, or two or three of the monoester, diester and triester which are added in time sequence. The preparation method of the water-soluble packaging film provided by the invention greatly improves the transparency and the aesthetic property of the water-soluble packaging film, and can properly delay the dissolution rate of the laundry beads and improve the utilization efficiency of the laundry beads.

Description

Water-soluble packaging film for packaging concentrated laundry detergent
Technical Field
The invention relates to the technical field of biological packaging materials, in particular to a water-soluble packaging film for packaging concentrated laundry detergent.
Background
In recent years, with the increasing economic living standard of people, people pay more and more attention to personal hygiene and health problems. For example, the total amount of clothes for each person is increasing year by year, and the definition of cleanliness has changed greatly while people are studying hygiene. When people wash clothes, the safety of the cleaning liquid and the health of human bodies are also emphasized in addition to the basic cleaning dirt of the clothes.
At present, for many young people and men who are not good at doing housework, the put-in amount of washing powder or washing liquid is not known well when the washing machine is used for washing clothes, or the put-in amount is excessive to cause the waste of the washing powder or the washing liquid, or the put-in amount is too small to achieve the purpose of washing the clothes. Moreover, the washing powder or the washing liquid can be spilled out in the using process, which not only pollutes the environment, but also causes the washing powder or the washing liquid to be directly contacted with the skin of a human body, thereby influencing the health of people.
The water-soluble film is a film material with water solubility and degradability, and can be quickly dissolved in water and quickly released from a packaged object, so that the packaged object can play a role, and the water-soluble film can be further degraded without residue. The water-soluble film has been accepted by a plurality of environmental protection departments internationally, and is widely applied to product packaging in the technical fields of agriculture, chemical industry, daily chemicals, medical treatment and the like.
At present, the water-soluble film mainly comprises a polyvinyl alcohol (PVA) film, a polyethylene oxide film, a methyl cellulose film and an edible starch film, and particularly the PVA film is widely applied in the field of packaging, mainly because the PVA film has strong water solubility, good antistatic performance, excellent heat sealability, good toughness, large tensile strength and tear strength at the head of various films, and has excellent fragrance retention and performance of preventing the package from sublimating.
PVA film is commonly used as a packaging material for concentrated laundry detergents, pesticides and other household chemical products, for example, pouches or beads made of PVA film are commonly used for packaging household care compositions, washing liquids for laundry or dish washing are packed into pouches made of PVA film, and consumers can directly add the required pouches into a bucket, sink or container of a washing machine for use, which not only facilitates providing accurate dispensing but also eliminates the need for the consumer to measure the composition, and the PVA film also isolates the composition packaged therein from the hands of the user, providing great convenience to the user.
However, the washing condensation beads made of the PVA film packaging film provided in the market at present have low transparency, the attractiveness of the product is influenced, the washing condensation beads made of the PVA film packaging film are dissolved in water too early, and in some washing machines which wash water first and then wash water, the washing condensation beads are easily dissolved by the water and washed out of the washing machine before washing, so that the efficacy of the washing condensation beads is greatly reduced, the aim of removing stains cannot be achieved, and great waste is caused.
Disclosure of Invention
In order to solve the disadvantages of the prior art, the present invention provides a water-soluble packaging film for packaging concentrated laundry detergent, which can properly delay the dissolution rate of laundry beads while improving the transparency and aesthetic appearance of the laundry beads.
The invention adopts the following technical scheme:
a water-soluble packaging film for packaging concentrated laundry detergent is prepared from the following raw materials in percentage by mass:
polyvinyl alcohol PVA-1788 solid content: 12% -20%;
thickening agent: 8 to 15 percent;
plasticizer: 10% -40%;
surfactant (b): 5% -8%;
defoaming agent: 0.2% -0.4%;
dissolution rate modifier: 3% -9%;
the balance of water;
preferably, the thickener is any one, two or more of starch, pectin, gum arabic, guar gum and sodium alginate.
Preferably, the dissolution rate modifier is one of a monoester, a diester and a triester, or any one, two or more thereof added in time series.
Preferably, the dissolution rate modifier comprises: any one, two or more of methyl stearate, polyglycerol fatty acid, allyl stearate and butyl stearate.
Preferably, the starch is modified starch, and the specific preparation steps of the modified starch are as follows:
step S100: 6-12 parts of plasticizer and 13-25 parts of waterborne polyurethane are dissolved at 42-50 ℃, and 60-75 parts of starch is gradually added.
Step S101: and (3) carrying out water bath and stirring on the plasticizer, the waterborne polyurethane and the starch at the temperature of 85-95 ℃ for 1-1.5h, and fully dissolving, dispersing and balancing the materials to obtain the modified starch.
The starch is any one, two or more of tapioca starch, corn starch, potato starch and pea starch.
Preferably, the starch is a modified starch, and the molecular structure of the modified starch is as follows:
Figure BDA0002976581940000031
the content of the raw materials is 5 to 15 percent by mass percent.
Preferably, the plasticizer is any one, two or more of a polyol, a polyol ether, a fatty amide and a fatty acid amide, wherein: the polyol is glycerol.
Preferably, the surfactant is any one, two or more of lauric acid, lauric acid amidopropyl, hydroxymethyl betaine, coconut oil and sodium dodecyl benzene sulfonate.
Preferably, the defoaming agent is any one, two or more of octanol, an organic silicon latex agent and tributyl phosphate.
Preferably, the water-soluble film further comprises a retarder, a dispersant, an antioxidant, a preservative, and an opening agent; the opening agent is any one or combination of two or more of talcum powder, diatomite, silicon dioxide, oleamide, erucamide and EBS derivatives, and the addition amount of the opening agent is 0.02-0.7% of that of polyvinyl alcohol.
The invention also provides a preparation method of the water-soluble packaging film for packaging the concentrated laundry detergent, which specifically comprises the following steps:
step 1: according to the raw material ratio, heating solvent water to 40-60 ℃, adding polyvinyl alcohol PVA-1788, stirring uniformly, and continuously heating to 90-100 ℃;
step 2: adding other plasticizers, thickeners and surfactants except starch at the temperature of 90-100 ℃, stirring for 1-3 h, and cooling to 65-75 ℃;
and step 3: adding starch and a dissolution rate regulator at the temperature of 65-75 ℃ and continuously stirring for 0.5-1.5 h to fully dissolve and disperse the materials;
and 4, step 4: primary filtering and pulping, wherein a fine filtering instrument is used to adjust the mesh number of a screen to be 140-300 meshes, a slurry liquid is formed after defoaming treatment by adding a defoaming agent into the slurry liquid, and the slurry liquid is kept stand for 24-30 hours;
and 5: fine filtering, namely adjusting the mesh number of a screen of a fine filtering instrument to 300-500 meshes, and then finely filtering the slurry;
step 6: adjusting the viscosity, namely adjusting the viscosity of the slurry to be 1500-2500s at the temperature of 40-45 ℃:
and 7: and (3) draining the slurry to a roller or steel belt equipment through a pipeline for drying and forming, and controlling the thickness of the obtained film to be 60-80um to form the film.
Preferably, any one, two or more of the dissolution rate modifier methyl stearate, polyglycerol fatty acid ester, allyl stearate and butyl stearate are sequentially added to the slurry in chronological order after 40 to 60 minutes of adding the modified starch for dissolution.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with the water-soluble packaging film for packaging concentrated laundry liquid seen in the market, the water-soluble packaging film provided by the invention has higher transparency and is glittering and translucent, and brings more beautiful visual enjoyment to people.
2. The invention solves the problems that washing condensation beads are dissolved and washed away by flushing water when the drum washing machine starts washing, waste is caused, and the laundry detergent packaged in the drum washing machine cannot be fully utilized by delaying the dissolving speed of the water-soluble packaging film when meeting water.
Detailed Description
The invention is further illustrated and described by the following specific examples, which do not limit the scope of the invention in any way.
Example 1: a water-soluble packaging film for packaging concentrated laundry detergent is prepared from the following raw materials in percentage by mass:
polyvinyl alcohol PVA-1788 solid content: 12 percent;
thickening agent: 8 percent;
plasticizer: 10 percent;
surfactant (b): 5 percent;
defoaming agent: 0.2 percent;
dissolution rate modifier: 3 percent of
The balance of water;
the thickening agent is modified starch, and the molecular structure of the modified starch is as follows:
Figure BDA0002976581940000051
CAS:9050-36-6; the molecular formula is as follows: c 6 H 12 O 6 (ii) a Molecular weight: 180.063385.
the preparation method of the water-soluble packaging film for packaging the concentrated laundry detergent provided by the invention comprises the following steps:
according to the raw material ratio, heating water, controlling the temperature to 40 ℃, adding polyvinyl alcohol PVA-1788, uniformly stirring, and continuously heating, controlling the temperature to 90 ℃; at the temperature of 90 ℃, adding other plasticizers, thickening agents and surfactants except for the modified starch, stirring for 1h, and then cooling to 65 ℃; adding modified starch and the methyl stearate at the temperature of 65 ℃, and continuously stirring for 0.5h to fully dissolve and disperse the materials; primarily filtering and pulping by using a fine filter instrument, adjusting the mesh number of a screen to 140 meshes, adding a defoaming agent into a slurry liquid, defoaming, and standing for 24 hours; fine filtration, namely adjusting the mesh number of a screen of a fine filtration instrument to 400 meshes and then finely filtering the slurry; adjusting the viscosity of the slurry to 1500s at 40 ℃, guiding the slurry to a roller or a steel belt by a pipeline for drying and forming, and controlling the thickness of the obtained film to be 60um to form the film.
Example 2: a water-soluble packaging film for packaging concentrated laundry detergent is prepared from the following raw materials in percentage by mass:
polyvinyl alcohol PVA-1788 solid content: 14 percent;
thickening agent: 9 percent;
plasticizer: 15 percent;
surfactant (b): 6 percent;
defoaming agent: 0.21%;
dissolution rate modifier: 4 percent;
the balance of water;
the thickening agent is modified starch, and the molecular structure of the modified starch is as follows:
Figure BDA0002976581940000052
CAS:9050-36-6; the molecular formula is as follows: c 6 H 12 O 6 (ii) a Molecular weight: 180.063385.
the preparation method of the water-soluble packaging film for packaging the concentrated laundry detergent provided by the invention comprises the following steps:
according to the raw material ratio, heating water to control the temperature to 46 ℃, adding polyvinyl alcohol PVA-1788, uniformly stirring, and continuously heating to control the temperature to 94 ℃; adding other plasticizers, thickening agents and surfactants except the modified starch at the temperature of 94 ℃, stirring for 1.6h, and then cooling to 67 ℃; adding modified starch and polyglycerol fatty acid ester at 66 deg.C, stirring for 0.6 hr to dissolve and disperse the materials, and fine filtering with fine filterBeginning of the designFiltering and pulping to adjust the mesh number of the screen to 160 meshes, and adding the defoaming agent into the pulp liquid to perform defoaming treatment to form pulp; standing for 26h; and (4) fine filtration, namely fine filtration is carried out on the slurry after the mesh number of a fine filtration instrument is adjusted to 430 meshes. Adjusting the viscosity to 1700s at 42 ℃; and (3) flowing the slurry to a roller or steel belt equipment through a pipeline for drying and forming, and controlling the thickness of the obtained film to be 64 mu m to form the film.
Example 3: a water-soluble packaging film for packaging concentrated laundry detergent is prepared from the following raw materials in percentage by mass:
polyvinyl alcohol PVA-1788 solid content: 16 percent;
thickening agent: 10 percent;
plasticizer: 20 percent;
surfactant (b): 7 percent;
defoaming agent: 0.23 percent;
dissolution rate modifier: 5 percent;
the balance of water;
the thickening agent is modified starch, and the preparation steps of the modified starch are as follows:
according to the weight portion, 8 portions of plasticizer and 17 portions of waterborne polyurethane are dissolved at 44 ℃, and 62 portions of potato starch are gradually added; and (2) carrying out water bath on the plasticizer, the waterborne polyurethane and the starch at the temperature of 90 ℃, and stirring for 1.3h to fully dissolve, disperse and balance the materials to obtain the modified starch, wherein the plasticizer is glycerol, the surfactant is lauric acid, and the defoaming agent is an organic silicon emulsion agent. In addition, the water-soluble film further comprises a dispersant, an antioxidant, a preservative and an opening agent; wherein the opening agent is diatomite, and the addition amount of the opening agent is 0.3 percent of the addition amount of polyvinyl alcohol; the dissolution speed regulator is allyl stearate in the monoester.
The preparation method of the water-soluble packaging film for packaging the concentrated laundry detergent provided by the invention comprises the following steps:
according to the raw material ratio, heating water, controlling the temperature to 48 ℃, adding polyvinyl alcohol PVA-1788, uniformly stirring, and continuously heating, controlling the temperature to 96 ℃; adding other plasticizers, thickening agents and surfactants except the modified starch at the temperature of 96 ℃, stirring for 2 hours, and then cooling to 69 ℃; adding modified starch and allyl stearate at 69 ℃ and continuously stirring for 0.9h to fully dissolve and disperse the materials, primarily filtering and pulping by using a fine filter instrument to adjust the mesh number of a screen to 170 meshes, and adding the defoaming agent into the pulp liquid to perform defoaming treatment to form pulp; standing for 27h; and (4) fine filtration, namely fine filtration is carried out on the slurry after the mesh number of a fine filtration instrument is adjusted to 440 meshes. Adjusting the viscosity to 1900s at 43 ℃; and (3) flowing the slurry to a roller or steel belt device through a pipeline for drying and forming, and controlling the thickness of the obtained film to be 66 mu m to form the film.
Example 4: a water-soluble packaging film for packaging concentrated laundry detergent is prepared from the following raw materials in percentage by mass:
polyvinyl alcohol PVA-1788 solid content: 18 percent;
thickening agent: 12 percent;
plasticizer: 25 percent;
surfactant (b): 7.5 percent;
defoaming agent: 0.25 percent;
dissolution rate modifier: 6 percent;
the balance of water;
the thickening agent is modified starch, and the preparation steps of the modified starch are as follows:
according to the weight portion, 9 portions of plasticizer and 19 portions of waterborne polyurethane are dissolved at 46 ℃, and 65 portions of potato starch are gradually added; and (3) carrying out water bath on the plasticizer, the waterborne polyurethane and the starch at the temperature of 92 ℃, and stirring for 1.4 hours to fully dissolve, disperse and balance the materials to obtain the modified starch, wherein the plasticizer is glycerol, the surfactant is lauric acid, and the defoaming agent is an organic silicon emulsion agent. In addition, the water-soluble film also comprises a dispersing agent, an antioxidant, a preservative and an opening agent, wherein the opening agent is diatomite, and the addition amount of the opening agent is 0.4% of that of the polyvinyl alcohol; the dissolution rate regulator is butyl stearate.
The preparation method of the water-soluble packaging film for packaging the concentrated laundry detergent provided by the invention comprises the following steps:
according to the raw material ratio, heating water to 50 ℃, adding polyvinyl alcohol PVA-1788, stirring uniformly, and continuously heating and controlling the temperature to 98 ℃; adding other plasticizers, thickeners and surfactants except the modified starch at the temperature of 98 ℃, stirring for 2.1h, and then cooling to 71 ℃; adding modified starch and butyl stearate at 71 ℃, continuously stirring for 1.1h to fully dissolve and disperse the materials, primarily filtering and pulping by using a fine filtering instrument to adjust the mesh number of a screen to 180 meshes, and adding the defoaming agent into the pulp liquid to perform defoaming treatment to form pulp; standing for 28 hours; fine filtration, namely fine filtration of the slurry after the mesh number of a fine filtration instrument is adjusted to 450 meshes. Adjusting the viscosity to 2100s at 44 ℃; and (3) flowing the slurry to a roller or steel belt equipment through a pipeline for drying and forming, and controlling the thickness of the obtained film to be 68um to form the film.
Example 5: a water-soluble packaging film for packaging concentrated laundry detergent is prepared from the following raw materials in percentage by mass:
polyvinyl alcohol PVA-1788 solid content: 19 percent;
thickening agent: 14 percent;
plasticizer: 35 percent;
surfactant (B): 7.8 percent;
defoaming agent: 0.3 percent;
dissolution rate modifier: 8 percent;
the balance of water;
the thickening agent is modified starch, and the preparation steps of the modified starch are as follows:
according to the weight portion, 10 portions of plasticizer and 23 portions of waterborne polyurethane are dissolved at 48 ℃, and then 70 portions of potato starch are gradually added; and (3) carrying out water bath on the plasticizer, the waterborne polyurethane and the starch at the temperature of 94 ℃, and stirring for 1.45h to fully dissolve, disperse and balance the materials to prepare the modified starch, wherein the plasticizer is glycerol, the surfactant is lauric acid, and the defoaming agent is an organic silicon emulsion agent. In addition, the water-soluble film also comprises a dispersing agent, an antioxidant, a preservative and an opening agent, wherein the opening agent is talcum powder, and the addition amount of the opening agent is 0.5 percent of that of the polyvinyl alcohol; the dissolution rate regulator is methyl stearate and polyglycerol fatty acid ester added in time sequence.
The preparation method of the water-soluble packaging film for packaging the concentrated laundry detergent provided by the invention comprises the following steps:
according to the raw material ratio, heating water, controlling the temperature to 55 ℃, adding polyvinyl alcohol PVA-1788, uniformly stirring, and continuously heating, controlling the temperature to 99 ℃; adding other plasticizers, thickening agents and surfactants except the modified starch at the temperature of 99 ℃, stirring for 2.5 hours, and then cooling to 73 ℃; modified starch, and methyl stearate and polyglycerol fatty acid ester by mass were added at a temperature of 73 ℃. Continuously stirring for 1.3h to fully dissolve and disperse the materials, primarily filtering and pulping by using a fine filter instrument to adjust the mesh number of a screen to 190 meshes, and adding the defoaming agent into the pulp liquid to perform defoaming treatment to form pulp; standing for 29h; and (4) fine filtration, namely fine filtration is carried out on the slurry after the mesh number of a fine filtration instrument is adjusted to 460 meshes. Adjusting the viscosity to 2300s at 44 ℃; and (3) flowing the slurry to a roller or steel belt equipment through a pipeline for drying and forming, and controlling the thickness of the obtained film to be 75um to form the film.
Example 6: a water-soluble packaging film for packaging concentrated laundry detergent is prepared from the following raw materials in percentage by mass:
polyvinyl alcohol PVA-1788 solid content: 20 percent;
thickening agent: 15 percent;
plasticizer: 40 percent;
surfactant (B): 8 percent;
0.4% of defoaming agent;
dissolution rate modifier: 9 percent;
the balance of water;
the thickening agent is modified starch, and the preparation steps of the modified starch are as follows:
according to the weight portion, after 12 portions of plasticizer and 25 portions of waterborne polyurethane are dissolved at 50 ℃, 75 portions of potato starch are gradually added; and (3) carrying out water bath on the plasticizer, the waterborne polyurethane and the starch at the temperature of 95 ℃, and stirring for 1.5 hours to fully dissolve, disperse and balance the materials to obtain the modified starch, wherein the plasticizer is glycerol, the surfactant is hydroxymethyl betaine, and the defoaming agent is octanol. In addition, the water-soluble film further comprises a dispersant, an antioxidant, a preservative and an opening agent; wherein the opening agent is silicon dioxide, and the addition amount of the opening agent is 0.7% of the addition amount of the polyvinyl alcohol. The dissolution rate regulator is methyl stearate, polyglycerol fatty acid ester, allyl stearate and butyl stearate which are added in time sequence.
The preparation method of the water-soluble packaging film for packaging the concentrated laundry detergent provided by the invention comprises the following steps:
according to the raw material ratio, heating water to control the temperature to 60 ℃, adding polyvinyl alcohol PVA-1788, uniformly stirring, and continuously heating to control the temperature to 100 ℃; adding other plasticizers, thickening agents and surfactants except the modified starch at the temperature of 100 ℃, stirring for 1.5h, and then cooling to 75 ℃; adding starch and polyglycerol fatty acid at the temperature of 75 ℃, adding agents of methyl stearate, polyglycerol fatty acid ester, allyl stearate and butyl stearate after 60 minutes, continuously stirring for 1 hour to fully dissolve and disperse the materials, performing primary filtration and pulping by using a fine filtration instrument to adjust the mesh number of a screen to be more than 200 meshes, and adding the defoaming agent into the slurry liquid to perform defoaming treatment to form slurry; standing for 30h; fine filtering to adjust the mesh number of the screen to 500 meshes; adjusting the viscosity to 2500s at 45 ℃; and (3) flowing the slurry onto a roller or steel belt equipment for drying and forming, and controlling the thickness of the obtained film to be 80 mu m to form the film.
The present invention has been described in detail and illustrated in the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are only preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for the purpose of limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
The first test example: the transparency and haze of the water-soluble packaging film of the invention were determined according to the national standard GB T2410-2008.
The test results show that the light transmittance of 6 examples is that of example 3, example 4, example 5, example 2, example 6 and example 1 from high to low, and the haze is that of example 1, example 6, example 2, example 4 and example 3 from high to low. From the combination of the test data, the transmittance and haze of example 3 are better, and those of example 1 are poorer. In addition, when the light transmittance and the haze of each example are respectively compared and analyzed, the light transmittance and the haze value are in inverse proportion, namely, the light transmittance is higher, the haze value is lower, and the light transmittance is lower, and the haze value is high. The test results further show that when the modified starch content is 9%, the light transmittance and haze of the water-soluble packaging film are both good.
TABLE 1 measurement of the mean values of the light transmittance and haze values in the different examples
Example 1 Example 2 Example 3 Example 4 Example 5 Example 6
Transparency 92.7％ 93.3％ 95.8％ 94.5％ 94.3％ 93.1％
Haze degree 4.13％ 2.56％ 2.25％ 2.32％ 2.49％ 2.51％
Test example two: the dissolution time of the water-soluble packaging film of the present invention was measured at 25 ℃.
3. The dissolution rates of the water-soluble wrap films of examples 1 to 6 were measured at 25 ℃ and the results are shown in Table 2. The test results show that the dissolution times are example 6, example 5, example 4, example 3, example 2 and example 1 in order from large to small, which shows that the dissolution time of the water-soluble packaging film can be delayed by adding the dissolution rate modifier, and the efficiency of the four dissolution rate modifiers in delaying the dissolution time of the water-soluble packaging film is methyl stearate, polyglycerol fatty acid ester, allyl stearate and butyl stearate in order from high to low. In addition, the test further shows that the effect of delaying dissolution is more remarkable if the dissolution rate regulators of methyl stearate, polyglycerol fatty acid ester, allyl stearate and butyl stearate are added according to a certain time sequence. The problem that the laundry detergent packaged in the drum-type washing machine cannot be fully utilized due to waste caused by the fact that washing water is used for dissolving and washing away laundry beads when the drum-type washing machine starts washing is solved greatly.
TABLE 2 dissolution time of water-soluble packaging film at 25 ℃
Figure BDA0002976581940000111

Claims (7)

1. The water-soluble packaging film for packaging the concentrated laundry detergent is characterized by being prepared from the following raw materials in percentage by mass:
polyvinyl alcohol PVA-1788 solid content: 12 to 20 percent;
thickening agent: 8 to 15 percent;
plasticizer: 10% -40%;
surfactant (B): 5% -8%;
defoaming agent: 0.2% -0.4%;
dissolution rate modifier: 3% -9%;
the balance of water;
wherein the dissolution rate regulator is any one, two or more of methyl stearate, polyglycerol fatty acid ester, allyl stearate and butyl stearate;
the thickening agent is modified starch;
the modified starch is prepared by adopting the following preparation steps:
step S100: dissolving 6-12 parts by weight of plasticizer and 13-25 parts by weight of waterborne polyurethane at 42-50 ℃, and gradually adding 60-75 parts by weight of starch;
step S101: carrying out water bath on the plasticizer, the waterborne polyurethane and the starch in the step S100 at the temperature of 85-95 ℃ and stirring for 1-1.5 hours to fully dissolve, disperse and balance the materials to prepare modified starch;
the starch is any one, two or more of tapioca starch, corn starch, potato starch and pea starch.
2. The water-soluble packaging film for packaging the concentrated laundry detergent of claim 1, wherein the plasticizer is any one, two or more of polyol, polyol ether and fatty acid amide, wherein: the polyol is glycerol.
3. The water-soluble packaging film for packaging the concentrated laundry detergent as claimed in claim 1, wherein the surfactant is any one, two or more of lauric acid, coconut oil and sodium dodecyl benzene sulfonate.
4. The water-soluble packaging film for packaging the concentrated laundry detergent as claimed in claim 1, wherein the defoaming agent is any one, two or more of octanol, silicone emulsion and tributyl phosphate.
5. The method for preparing a water-soluble packaging film for packaging a concentrated laundry detergent according to claim 1, wherein the method comprises:
step 1: according to the raw material ratio, heating water, controlling the temperature to be 40-60 ℃, adding polyvinyl alcohol PVA-1788, uniformly stirring, and continuously heating, controlling the temperature to be 90-100 ℃;
and 2, step: adding the plasticizer and the surfactant, stirring for 1-3 h, and cooling to 65-75 ℃;
and 3, step 3: adding the modified starch and the dissolution rate regulator, and continuously stirring for 0.5-1.5 h to dissolve and disperse the materials;
and 4, step 4: primary filtering and pulping, wherein a fine filtering instrument is used to adjust the mesh number of a screen to 140-300 meshes, the pulp is added with a defoaming agent for defoaming treatment to form pulp, and the pulp is kept stand for 24-30 hours;
and 5: fine filtering, namely fine filtering the slurry after the mesh number of a screen of a fine filtering instrument is adjusted to 300-500 meshes;
step 6: adjusting the viscosity of the slurry, namely adjusting the viscosity of the slurry to 1500-2500s at 40-45 ℃;
and 7: and (3) draining the slurry with the adjusted viscosity to a roller or steel belt device through a pipeline for drying and forming, controlling the thickness of the obtained film to be 60-80 mu m, and forming the film.
6. The water-soluble packaging film for packaging a concentrated laundry detergent as claimed in claim 5, wherein after adding the modified starch for 40-60 minutes, 5% of dissolution rate modifier of any one, two or more of methyl stearate, polyglyceryl fatty acid ester, allyl stearate and butyl stearate is sequentially added to the slurry in chronological order for dissolution.
7. The water-soluble packaging film for packaging the concentrated laundry detergent as claimed in claim 1, wherein the water-soluble film further comprises a dispersant, an antioxidant, a preservative and an opening agent; the opening agent is any one or combination of two or more of talcum powder, diatomite, silicon dioxide, oleamide and erucamide, and the addition amount of the opening agent is 0.02-0.7% of that of polyvinyl alcohol.
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