CN112706237A - Formaldehyde-free ecological plate coated high-tensile-strength PP film facing process - Google Patents

Formaldehyde-free ecological plate coated high-tensile-strength PP film facing process Download PDF

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CN112706237A
CN112706237A CN202011497288.XA CN202011497288A CN112706237A CN 112706237 A CN112706237 A CN 112706237A CN 202011497288 A CN202011497288 A CN 202011497288A CN 112706237 A CN112706237 A CN 112706237A
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parts
film
free
plate
aldehyde
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CN112706237B (en
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杨芝勇
杨乐
杨栩
罗凤蓉
杨枝林
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Guangxi Guigang Taixiang Wood Industry Co ltd
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Guangxi Guigang Taixiang Wood Industry Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
    • B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/66—Polyesters containing oxygen in the form of ether groups
    • C08G63/668—Polyesters containing oxygen in the form of ether groups derived from polycarboxylic acids and polyhydroxy compounds
    • 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
    • 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
    • C09J167/00—Adhesives based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Adhesives based on derivatives of such polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92895—Barrel or housing
    • 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
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10—Homopolymers or copolymers of propene
    • C08J2323/12—Polypropene
    • 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
    • C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2401/08—Cellulose derivatives
    • C08J2401/26—Cellulose ethers
    • C08J2401/28—Alkyl ethers
    • 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
    • C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C08J2477/04—Polyamides derived from alpha-amino 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
    • C08J2489/00—Characterised by the use of proteins; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
    • C08K13/04—Ingredients characterised by their shape and organic or inorganic ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C08K7/04—Fibres or whiskers inorganic
    • C08K7/14—Glass

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)

Abstract

The invention discloses a process for coating a PP film veneer with high tensile strength on an aldehyde-free ecological plate, which comprises the following steps: (1) the prepared multilayer solid wood board base material is matched with aldehyde-free glue, and the aldehyde-free glue is uniformly coated on the front surface and the back surface of the base material after the base material is subjected to a double-shaft gluing machine; (2) pushing a base material plate at the front end of a laminator to carry out laminating, then connecting a laminating plate and laying a PP film at the rear end of the laminator, arranging a long-side and short-plate backer on a lifting table for plate stacking, then laying a bottom PP film firstly, then laying the laminating plate to the stacking lifting table horizontally, and laying the front PP film in a reciprocating manner; (3) placing the laid PP film formaldehyde-free plate in a cold press for prepressing; (4) after the pre-pressing is finished, the plate is moved to a hot press for hot pressing; (5) and (4) after the hot pressing is finished, edge sawing is carried out on the board to obtain the PP film veneering decorative formaldehyde-free ecological board with high tensile strength. The aldehyde-free ecological plate prepared by the invention has excellent performance and high production efficiency, and can meet the production and application requirements.

Description

Formaldehyde-free ecological plate coated high-tensile-strength PP film facing process
Technical Field
The invention belongs to the technical field of artificial board processing, and particularly relates to a process for coating a PP film veneer with high tensile strength on an aldehyde-free ecological board.
Background
The adhesive industry is one of the fine chemical industries which develop rapidly in the world, is more and more concerned by all countries in the world along with the development of economy and the enhancement of environmental protection consciousness of people, is used as a multi-industry common product and technology, has brand new social requirements on adhesive performances such as non-toxicity, harmlessness, environmental friendliness, degradability and the like, obtains various green adhesive products and technologies which have high environmental compatibility, low manufacturing cost, economy and practicability by taking natural biomass materials as raw materials, and becomes a research hotspot in the field of current adhesives.
Most of adhesives for wood bonding contain formaldehyde, and wood products containing formaldehyde can cause serious influence on human health; the biomass adhesive without formaldehyde is an important research direction.
Chinese patent application document "a formaldehyde-free adhesive for artificial boards and a preparation method thereof (application publication No. CN 111303798A)" discloses a formaldehyde-free adhesive for artificial boards and a preparation method thereof. The formaldehyde-free adhesive for the artificial board comprises the main raw materials of biomass gum, sodium borate, ethylene glycol, polyvinyl alcohol, urea, glycerol and water, wherein the biomass gum comprises locust bean gum, tara gum and tamarind gum, and the weight ratio of the locust bean gum to the tara gum is 7-9: 3-5: 1-3. According to the formaldehyde-free adhesive for the artificial board and the preparation method thereof, formaldehyde is not doped, the activity of the locust bean gum and the tamarind gum is enhanced after the locust bean gum and the tamarind gum are puffed, the texture is more delicate, the uniform and non-dispersion of the locust bean gum and the tamarind gum are facilitated, the exquisite uniformity of the gum is enhanced, the Caesalpinia spinosa gum, the sodium borate, the ethylene glycol, the polyvinyl alcohol, the urea, the glycerol and the water are mixed and then atomized and sprayed into the homogeneous gum solution containing the locust bean gum and the tamarind gum in a stirring state at 85-90 ℃, the full mixing and the rapid and uniform distribution among all substances are facilitated. But the viscosity is poor, and the application requirement can not be met.
At present, a large amount of PP films are not used for home decoration temporarily, because the aldehyde-free plates of the PP films cannot be produced in large quantities and only stay in the production stage of a laboratory, the problem of production efficiency cannot be solved, and the aldehyde-free plates of the PP films cannot be produced in batches.
The Chinese patent application document 'a high-temperature-resistant aging-resistant degradation-controllable PP film and a preparation method thereof (application publication number: CN 104277335A)' discloses a high-temperature-resistant aging-resistant degradation-controllable PP film and a preparation method thereof, wherein the PP film comprises the following components: the polypropylene composition comprises PP copolymer, an antioxidant, an auxiliary antioxidant, glass fiber, sodium sulfide, lecithin, glycerol, magnesium stearate and starch. The preparation method comprises the steps of adding the copolymerized PP, the glass fiber, the lecithin and the sodium sulfide into a reaction kettle, stirring and reacting for 50-90min at the temperature of 180-200 ℃ under the protection of inert gas at the speed of 80-100r/min, then adding the rest components, stirring and mixing uniformly at the temperature of 70-80 ℃, then extruding and granulating in a double-screw extruder to obtain master batches, and finally extruding and blowing the master batches into films by a plastic film blowing machine to obtain the high-temperature-resistant aging-resistant degradation-controllable PP film. The PP film has good performance, and meanwhile, the degradation of the PP film can be controlled according to the property of the PP film so as to achieve the complete degradation of the PP film, but the PP film has poor tensile strength and cannot meet the application requirements.
Disclosure of Invention
The invention provides a process for coating a high-tensile-strength PP film on an aldehyde-free ecological plate, which aims to solve the problems that the aldehyde-free glue prepared by the prior art is poor in viscosity, the PP film is low in tensile strength and cannot meet the production and application requirements of artificial boards.
In order to solve the technical problems, the invention adopts the following technical scheme:
a process for coating a PP film veneer with high tensile strength on an aldehyde-free ecological plate comprises the following steps:
(1) the prepared multilayer solid wood board base material is matched with aldehyde-free glue, and the aldehyde-free glue is uniformly coated on the front surface and the back surface of the base material after the base material is subjected to a double-shaft gluing machine;
the formaldehyde-free glue comprises the following raw materials: polyether triol, tetramethyl glutaric acid, propyl formate, butanone, triisopropanolamine, water, N-dimethylformamide and N-butanol, wherein the weight ratio of the water to the N, N-dimethylformamide is (45-70): (15-22);
(2) pushing a base material plate at the front end of a laminator to carry out laminating, then connecting a laminating plate and laying a PP film at the rear end of the laminator, arranging a long-side and short-plate backer on a lifting table for plate stacking, then laying a bottom PP film firstly, then laying the laminating plate to the stacking lifting table horizontally, and laying the front PP film in a reciprocating manner;
the PP film comprises the following raw materials in parts by weight: 82-100 parts of polypropylene particles, 12-16 parts of lecithin, 3-5 parts of glass fiber, 13-18 parts of cassava starch, 10761.2-3 parts of antioxidant, 2-4 parts of potassium sulfide, 3-6 parts of pentaerythritol, 1.2-2 parts of zinc stearate, 3-7 parts of soybean peptide powder, 1.6-2.5 parts of sodium carboxymethylcellulose and 2-4 parts of polylysine;
the preparation method of the PP film comprises the following steps:
step one, adding polypropylene particles, lecithin, tapioca starch, potassium sulfide, pentaerythritol, soybean peptide powder, sodium carboxymethylcellulose and polylysine into a reaction kettle, stirring and reacting at the temperature of 192-;
step two, reducing the temperature of the mixture a to 75-85 ℃, then adding the rest components into the mixture a obtained in the step one, and stirring at the speed of 300r/min for 90-120min to obtain a mixture b;
thirdly, putting the mixture b obtained in the second step into a double-screw extruder for extrusion and granulation to obtain master batches, wherein the extrusion and granulation conditions are that the temperature of the rear section of a double-screw extruder barrel is controlled in three sections and is respectively controlled at 218 ℃ of 202-;
extruding and blowing the master batch obtained in the step three by using a plastic film blowing machine to obtain a PP film, wherein the temperature of the rear section of a charging barrel of the film blowing machine is controlled in three sections, respectively controlled at 212-219 ℃, the temperature of the front section of the charging barrel is controlled in three sections, respectively controlled at 221-230 ℃, the blow-up ratio is 1.6-1.9, the rotating speed of a screw is 25-35r/min, and the traction speed is 30-40 m/min;
(3) placing the laid PP film formaldehyde-free plate in a cold press for prepressing;
(4) after the pre-pressing is finished, the plate is moved to a hot press for hot pressing;
(5) and (4) after the hot pressing is finished, edge sawing is carried out on the board to obtain the PP film veneering decorative formaldehyde-free ecological board with high tensile strength.
Further, the aldehyde-free glue in the step (1) comprises the following raw materials in parts by weight: 40-60 parts of polyether triol, 16-25 parts of tetramethyl glutaric acid, 12-20 parts of propyl formate, 30-50 parts of butanone, 9-17 parts of triisopropanolamine, 45-70 parts of water, 15-22 parts of N, N-dimethylformamide and 8-14 parts of N-butanol.
Further, the preparation method of the aldehyde-free glue comprises the following steps:
a. adding 40-60 parts by weight of polyether triol and 16-25 parts by weight of tetramethyl glutaric acid into a reaction kettle, and carrying out polymerization reaction for 1-1.5h at the temperature of 76-93 ℃ and the microwave power of 100-200W until the reaction is finished;
b. b, adding 12-20 parts of propyl formate and 30-50 parts of butanone into the reaction kettle after the reaction in the step a, and carrying out dilution reflux reaction for 2-3h at the temperature of 65-70 ℃ to obtain a reaction solution;
c. cooling the reaction liquid prepared in the step b to 43-48 ℃, and adding 9-17 parts of triisopropanolamine for neutralization to form salt;
d. adding 45-70 parts of water into the neutralized salt obtained in the step c at the rotating speed of 2000-3000r/min, and stirring and emulsifying for 20-30min to obtain an emulsion;
e. adding 15-22 parts of N, N-dimethylformamide into the emulsion prepared in the step d to carry out chain extension reaction for 40-60min to prepare a chain extension reactant;
f. and e, adding 8-14 parts of n-butyl alcohol into the chain extension reactant prepared in the step e for end capping reaction for 1.2-2 hours to prepare the aldehyde-free adhesive.
Further, the glue coating amount of the non-formaldehyde glue is 146g/m3。
Further, the PP film in the step (2) comprises the following raw materials in parts by weight: 94 parts of polypropylene particles, 14 parts of lecithin, 4 parts of glass fiber, 15 parts of cassava starch, 10762.3 parts of antioxidant, 3 parts of potassium sulfide, 5 parts of pentaerythritol, 1.5 parts of zinc stearate, 5 parts of soybean peptide powder, 2 parts of sodium carboxymethylcellulose and 3 parts of polylysine.
Further, the average efficiency of laying the PP film formaldehyde-free plate in the step (3) is 120 pieces/h.
Further, pre-pressing for 48-62min under the pre-pressing pressure of 6-8MPa in the step (3).
Further, in the step (4), hot pressing is carried out for 48-60min under the hot pressing pressure of 7-9MPa and the hot pressing temperature of 93-105 ℃.
The invention has the following beneficial effects:
(1) according to the invention, polyether triol and tetramethyl glutaric acid are adopted for polymerization reaction, propyl formate and butanone are added for dilution reflux reaction after the reaction is completed, the prepared reaction solution is cooled, triisopropanolamine is added for neutralization and salification, water is added into the neutralization and salification for high-speed shearing emulsification, the neutralization and salification emulsification is fully dispersed, then N, N-dimethylformamide with extremely high activity is added for rapid promotion of chain extension reaction, and finally N-butanol is added for end capping reaction, the viscosity of the prepared formaldehyde-free adhesive is up to more than 50.6Pa & S, and is obviously higher than that of the formaldehyde-free adhesive prepared by the prior art and at least higher than 29.7%; the free formaldehyde of the non-formaldehyde glue prepared by the invention is 0g/kg, which is the same as the free formaldehyde of the non-formaldehyde glue prepared by the prior art, thus the technology of the invention has obvious progress and the product is environment-friendly.
(2) The soybean peptide powder, the sodium carboxymethylcellulose and the polylysine play a synergistic role in preparing the PP film, and the tensile strength of the PP film is synergistically improved because:
the soybean peptide powder has extremely good dispersibility, can improve the fluidity of a PP film in the extrusion film blowing process of a plastic film blowing machine, has good thermal stability, can promote the thermal stability of sodium carboxymethyl cellulose, and can greatly improve the elasticity of the PP film by the gelation property when the soybean peptide powder is dispersed in the PP film so as to improve the tensile strength. In addition, sodium carboxymethylcellulose also has a hyperfine reticular structure and good compatibility, and can form a three-dimensional reticular structure when being used with the soybean peptide powder, so that a more stable structure is formed, and the tensile strength is further improved. The polylysine is added into the PP film prepared by the invention, so that the organic combination of the sodium carboxymethylcellulose and the soybean peptide powder can be promoted, and the polylysine can also perform acylation with the peptide bond of the soybean peptide powder and the active hydroxyl of the sodium carboxymethylcellulose to form a more stable structure, so that the tensile strength can be further improved. Therefore, under the synergistic effect of the soybean peptide powder, the sodium carboxymethyl cellulose and the polylysine, the tensile strength of the PP film is synergistically improved.
(3) At present, the PP film is not used for home decoration in a large amount, because the formaldehyde-free PP film cannot be produced in a large amount and only stays in a laboratory production stage, the average efficiency of laying the formaldehyde-free PP film board reaches 120 pieces per hour, the problem of production efficiency is solved, the formaldehyde-free PP film board can be produced in batch, and the market demand can be met.
(4) The surface bonding strength of the high-tensile-strength PP film veneered decorative formaldehyde-free ecological plate prepared by the invention is obviously higher than that of a PP film veneered decorative plate prepared by the prior art, and the water content is equivalent to that of the prior art, so that the PP film veneered decorative formaldehyde-free ecological plate produced by the process has excellent performance and can meet the market application requirements.
Detailed Description
In order to facilitate a better understanding of the invention, the following examples are given to illustrate, but not to limit the scope of the invention.
In an embodiment, the aldehyde-free ecological plate coating high tensile strength PP film finishing process comprises the following steps:
(1) the prepared multilayer solid wood board base material is matched with aldehyde-free glue, and the aldehyde-free glue is uniformly coated on the front surface and the back surface of the base material after the base material is subjected to a double-shaft gluing machine, wherein the gluing amount is 137-3；
The preparation method of the aldehyde-free glue comprises the following steps:
a. adding 40-60 parts by weight of polyether triol and 16-25 parts by weight of tetramethyl glutaric acid into a reaction kettle, and carrying out polymerization reaction for 1-1.5h at the temperature of 76-93 ℃ and the microwave power of 100-200W until the reaction is finished;
b. b, adding 12-20 parts of propyl formate and 30-50 parts of butanone into the reaction kettle after the reaction in the step a, and carrying out dilution reflux reaction for 2-3h at the temperature of 65-70 ℃ to obtain a reaction solution;
c. cooling the reaction liquid prepared in the step b to 43-48 ℃, and adding 9-17 parts of triisopropanolamine for neutralization to form salt;
d. adding 45-70 parts of water into the neutralized salt obtained in the step c at the rotating speed of 2000-3000r/min, and stirring and emulsifying for 20-30min to obtain an emulsion;
e. adding 15-22 parts of N, N-dimethylformamide into the emulsion prepared in the step d to carry out chain extension reaction for 40-60min to prepare a chain extension reactant;
f. adding 8-14 parts of n-butyl alcohol into the chain extension reactant prepared in the step e to carry out end capping reaction for 1.2-2h, so as to prepare aldehyde-free glue;
(2) pushing a base material plate at the front end of a laminator to carry out laminating, then connecting a laminating plate and laying a PP film at the rear end of the laminator, arranging a long-side and short-plate backer on a lifting table for plate stacking, then laying a bottom PP film firstly, then laying the laminating plate to the stacking lifting table horizontally, and laying the front PP film in a reciprocating manner;
the PP film comprises the following raw materials in parts by weight: 82-100 parts of polypropylene particles, 12-16 parts of lecithin, 3-5 parts of glass fiber, 13-18 parts of cassava starch, 10761.2-3 parts of antioxidant, 2-4 parts of potassium sulfide, 3-6 parts of pentaerythritol, 1.2-2 parts of zinc stearate, 3-7 parts of soybean peptide powder, 1.6-2.5 parts of sodium carboxymethylcellulose and 2-4 parts of polylysine;
the preparation method of the PP film comprises the following steps:
step one, adding polypropylene particles, lecithin, tapioca starch, potassium sulfide, pentaerythritol, soybean peptide powder, sodium carboxymethylcellulose and polylysine into a reaction kettle, stirring and reacting at the temperature of 192-;
step two, reducing the temperature of the mixture a to 75-85 ℃, then adding the rest components into the mixture a obtained in the step one, and stirring at the speed of 300r/min for 90-120min to obtain a mixture b;
thirdly, putting the mixture b obtained in the second step into a double-screw extruder for extrusion and granulation to obtain master batches, wherein the extrusion and granulation conditions are that the temperature of the rear section of a double-screw extruder barrel is controlled in three sections and is respectively controlled at 218 ℃ of 202-;
extruding and blowing the master batch obtained in the step three by using a plastic film blowing machine to obtain a PP film, wherein the temperature of the rear section of a charging barrel of the film blowing machine is controlled in three sections, respectively controlled at 212-219 ℃, the temperature of the front section of the charging barrel is controlled in three sections, respectively controlled at 221-230 ℃, the blow-up ratio is 1.6-1.9, the rotating speed of a screw is 25-35r/min, and the traction speed is 30-40 m/min;
(3) the average efficiency is 120 pieces/h, every 60 pieces are used as a stacking, the laid PP film formaldehyde-free plate is placed in a cold press for prepressing, and the prepressing is carried out for 48-62min under the prepressing pressure of 6-8 MPa;
(4) after the pre-pressing is finished, the plate is moved to a hot press for hot pressing, and the plate is hot pressed for 48-60min under the hot pressing pressure of 7-9MPa and the hot pressing temperature of 93-105 ℃;
(5) and (4) after the hot pressing is finished, edge sawing is carried out on the board to obtain the PP film veneering decorative formaldehyde-free ecological board with high tensile strength.
The following is a more specific example.
Example 1
A process for coating a PP film veneer with high tensile strength on an aldehyde-free ecological plate comprises the following steps:
(1) the prepared multilayer solid wood board substrate is matched with aldehyde-free glue, and the aldehyde-free glue is uniformly coated on the front side and the back side of the substrate after passing through a double-shaft gluing machine, wherein the gluing amount is 139g/m3；
The preparation method of the aldehyde-free glue comprises the following steps:
a. adding 40 parts by weight of polyether triol and 16 parts by weight of tetramethyl glutaric acid into a reaction kettle, and carrying out polymerization reaction for 1.4h at the temperature of 78 ℃ and the microwave power of 100W until the reaction is finished;
b. c, adding 13 parts of propyl formate and 32 parts of butanone into the reaction kettle after the reaction in the step a, and carrying out dilution reflux reaction for 3 hours at the temperature of 65 ℃ to obtain a reaction solution;
c. b, cooling the reaction solution prepared in the step b to 44 ℃, and adding 10 parts of triisopropanolamine for neutralization to form salt;
d. c, adding 47 parts of water into the neutralized salt obtained in the step c at the rotating speed of 2000r/min, stirring and emulsifying for 30min to obtain an emulsion;
e. adding 15 parts of N, N-dimethylformamide into the emulsion prepared in the step d to carry out chain extension reaction for 60min to prepare a chain extension reactant;
f. adding 8 parts of n-butanol into the chain extension reactant prepared in the step e to carry out end capping reaction for 2 hours to prepare aldehyde-free glue;
(2) pushing a base material plate at the front end of a laminator to carry out laminating, then connecting a laminating plate and laying a PP film at the rear end of the laminator, arranging a long-side and short-plate backer on a lifting table for plate stacking, then laying a bottom PP film firstly, then laying the laminating plate to the stacking lifting table horizontally, and laying the front PP film in a reciprocating manner;
the PP film comprises the following raw materials in parts by weight: 83 parts of polypropylene particles, 12 parts of lecithin, 3 parts of glass fiber, 13 parts of cassava starch, 10761.3 parts of antioxidant, 2 parts of potassium sulfide, 3 parts of pentaerythritol, 1.3 parts of zinc stearate, 4 parts of soybean peptide powder, 1.7 parts of sodium carboxymethylcellulose and 2.1 parts of polylysine;
the preparation method of the PP film comprises the following steps:
adding polypropylene particles, lecithin, tapioca starch, potassium sulfide, pentaerythritol, soybean peptide powder, sodium carboxymethylcellulose and polylysine into a reaction kettle, and stirring and reacting at 194 ℃ and 150r/min for 85min under the protection of nitrogen to obtain a mixture a;
step two, reducing the temperature of the mixture a to 76 ℃, then adding the rest components into the mixture a obtained in the step one, and stirring at the speed of 250r/min for 120min to obtain a mixture b;
thirdly, putting the mixture b obtained in the second step into a double-screw extruder for extrusion granulation to obtain master batches, wherein the extrusion granulation condition is that the temperature of the rear section of a double-screw extruder barrel is controlled in three sections, respectively controlled at 203 ℃, 207 ℃ and 212 ℃, the temperature of the front section of the barrel is controlled in three sections, respectively controlled at 211 ℃, 219 ℃ and 225 ℃, and the temperature of a machine head is controlled in two sections, respectively controlled at 222 ℃, 231 ℃ and 238 ℃;
extruding the master batch obtained in the step three by using a plastic film blowing machine to blow a film to obtain a PP film, wherein the temperature of the rear section of a charging barrel of the film blowing machine is controlled in three sections, namely 213 ℃, 215 ℃ and 217 ℃, and the temperature of the front section of the charging barrel is controlled in three sections, namely 221 ℃, 225 ℃ and 229 ℃, the blow-up ratio is 1.6, the rotating speed of a screw is 25r/min, and the traction speed is 30 m/min;
(3) the average efficiency is 120 pieces/h, every 60 pieces are used as a stacking, the laid PP film formaldehyde-free plate is placed in a cold press for prepressing, and the prepressing is carried out for 62min under the prepressing pressure of 6 MPa;
(4) after the pre-pressing is finished, the plate is moved to a hot press for hot pressing, and the hot pressing is carried out for 58min under the hot pressing pressure of 7MPa and the hot pressing temperature of 95 ℃;
(5) and (4) after the hot pressing is finished, edge sawing is carried out on the board to obtain the PP film veneering decorative formaldehyde-free ecological board with high tensile strength.
Example 2
A process for coating a PP film veneer with high tensile strength on an aldehyde-free ecological plate comprises the following steps:
(1) the prepared multilayer solid wood board substrate is matched with aldehyde-free glue, and the aldehyde-free glue is uniformly coated on the front side and the back side of the substrate after passing through a double-shaft gluing machine, wherein the gluing amount is 141g/m3；
The preparation method of the aldehyde-free glue comprises the following steps:
a. adding 48 parts by weight of polyether triol and 19 parts by weight of tetramethyl glutaric acid into a reaction kettle, and carrying out polymerization reaction for 1.3h at the temperature of 85 ℃ and the microwave power of 150W until the reaction is finished;
b. b, adding 17 parts of propyl formate and 39 parts of butanone into the reaction kettle after the reaction in the step a, and carrying out dilution reflux reaction for 2.6 hours at the temperature of 68 ℃ to obtain a reaction solution;
c. cooling the reaction liquid prepared in the step b to 45 ℃, and adding 15 parts of triisopropanolamine for neutralization to form salt;
d. adding 58 parts of water into the neutralized salt obtained in the step c at the rotating speed of 3000r/min, stirring and emulsifying for 22min to obtain an emulsion;
e. adding 18 parts of N, N-dimethylformamide into the emulsion prepared in the step d to carry out chain extension reaction for 52min to prepare a chain extension reactant;
f. adding 11 parts of n-butanol into the chain extension reactant prepared in the step e to carry out end capping reaction for 1.7 hours to prepare aldehyde-free glue;
(2) pushing a base material plate at the front end of a laminator to carry out laminating, then connecting a laminating plate and laying a PP film at the rear end of the laminator, arranging a long-side and short-plate backer on a lifting table for plate stacking, then laying a bottom PP film firstly, then laying the laminating plate to the stacking lifting table horizontally, and laying the front PP film in a reciprocating manner;
the PP film comprises the following raw materials in parts by weight: 94 parts of polypropylene particles, 14 parts of lecithin, 4 parts of glass fiber, 15 parts of cassava starch, 10762.3 parts of antioxidant, 3 parts of potassium sulfide, 5 parts of pentaerythritol, 1.5 parts of zinc stearate, 5 parts of soybean peptide powder, 2 parts of sodium carboxymethylcellulose and 3 parts of polylysine;
the preparation method of the PP film comprises the following steps:
adding polypropylene particles, lecithin, tapioca starch, potassium sulfide, pentaerythritol, soybean peptide powder, sodium carboxymethylcellulose and polylysine into a reaction kettle, and stirring and reacting at the temperature of 202 ℃ and under the protection of nitrogen at the speed of 200r/min for 58min to obtain a mixture a;
step two, reducing the temperature of the mixture a to 80 ℃, then adding the rest components into the mixture a obtained in the step one, and stirring for 90min at the speed of 300r/min to obtain a mixture b;
thirdly, putting the mixture b obtained in the second step into a double-screw extruder for extrusion granulation to obtain master batches, wherein the extrusion granulation condition is that the temperature of the rear section of a double-screw extruder barrel is controlled in three sections, respectively controlled at 204 ℃, 210 ℃ and 217 ℃, the temperature of the front section of the barrel is controlled in three sections, respectively controlled at 212 ℃, 220 ℃ and 227 ℃, and the temperature of a machine head is controlled in two sections, respectively controlled at 221 ℃, 229 ℃ and 235 ℃;
extruding the master batch obtained in the step three by using a plastic film blowing machine to blow a film to obtain a PP film, wherein the temperature of the rear section of a charging barrel of the film blowing machine is controlled in three sections, namely 214 ℃, 217 ℃ and 219 ℃, and the temperature of the front section of the charging barrel is controlled in three sections, namely 223 ℃, 226 ℃ and 230 ℃, the blowing ratio is 1.7, the rotating speed of a screw is 32r/min, and the traction speed is 34 m/min;
(3) the average efficiency is 120 pieces/h, every 60 pieces are used as a stacking, the laid PP film formaldehyde-free plate is placed in a cold press for prepressing, and the prepressing is carried out for 56min under the prepressing pressure of 7 MPa;
(4) after the pre-pressing is finished, the plate is moved to a hot press for hot pressing, and the hot pressing is carried out for 55min under the hot pressing pressure of 8MPa and the hot pressing temperature of 100 ℃;
(5) and (4) after the hot pressing is finished, edge sawing is carried out on the board to obtain the PP film veneering decorative formaldehyde-free ecological board with high tensile strength.
Example 3
A process for coating a PP film veneer with high tensile strength on an aldehyde-free ecological plate comprises the following steps:
(1) the prepared multilayer solid wood board base material is matched with aldehyde-free glue, and after the base material passes through a double-shaft gluing machine, the front side and the back side of the base material are uniformly coated with the aldehyde-free glue for gluingThe amount is 144g/m3；
The preparation method of the aldehyde-free glue comprises the following steps:
a. adding 58 parts by weight of polyether triol and 24 parts by weight of tetramethyl glutaric acid into a reaction kettle, and carrying out polymerization reaction for 1.1h at the temperature of 91 ℃ and the microwave power of 190W until the reaction is finished;
b. b, adding 19 parts of propyl formate and 50 parts of butanone into the reaction kettle after the reaction in the step a, and carrying out dilution reflux reaction for 2.6 hours at the temperature of 68 ℃ to obtain a reaction solution;
c. c, cooling the reaction liquid prepared in the step b to 48 ℃, and adding 16 parts of triisopropanolamine for neutralization to form salt;
d. adding 69 parts of water into the neutralized salt obtained in the step c at the rotation speed of 2800r/min, stirring and emulsifying for 23min to obtain an emulsion;
e. adding 21 parts of N, N-dimethylformamide into the emulsion prepared in the step d to carry out chain extension reaction for 56min to prepare a chain extension reactant;
f. adding 13 parts of n-butanol into the chain extension reactant prepared in the step e to carry out end capping reaction for 1.5 hours to prepare aldehyde-free glue;
(2) pushing a base material plate at the front end of a laminator to carry out laminating, then connecting a laminating plate and laying a PP film at the rear end of the laminator, arranging a long-side and short-plate backer on a lifting table for plate stacking, then laying a bottom PP film firstly, then laying the laminating plate to the stacking lifting table horizontally, and laying the front PP film in a reciprocating manner;
the PP film comprises the following raw materials in parts by weight: 100 parts of polypropylene particles, 15 parts of lecithin, 5 parts of glass fiber, 18 parts of cassava starch, 10763 parts of antioxidant, 4 parts of potassium sulfide, 6 parts of pentaerythritol, 2 parts of zinc stearate, 7 parts of soybean peptide powder, 2.4 parts of sodium carboxymethylcellulose and 4 parts of polylysine;
the preparation method of the PP film comprises the following steps:
adding polypropylene particles, lecithin, tapioca starch, potassium sulfide, pentaerythritol, soybean peptide powder, sodium carboxymethylcellulose and polylysine into a reaction kettle, and stirring and reacting at the temperature of 205 ℃ and under the protection of nitrogen at the speed of 200r/min for 60min to obtain a mixture a;
step two, reducing the temperature of the mixture a to 85 ℃, then adding the rest components into the mixture a obtained in the step one, and stirring for 110min at the speed of 280r/min to obtain a mixture b;
thirdly, putting the mixture b obtained in the second step into a double-screw extruder for extrusion granulation to obtain master batches, wherein the extrusion granulation condition is that the temperature of the rear section of a double-screw extruder barrel is controlled in three sections, respectively controlled at 203 ℃, 210 ℃ and 216 ℃, the temperature of the front section of the barrel is controlled in three sections, respectively controlled at 210 ℃, 222 ℃ and 228 ℃, the temperature of a machine head is controlled in two sections, respectively controlled at 223 ℃, 233 ℃ and 238 ℃;
extruding the master batch obtained in the step three by using a plastic film blowing machine to blow a film to obtain a PP film, wherein the temperature of the rear section of a charging barrel of the film blowing machine is controlled in three sections, the temperature is respectively controlled at 212 ℃, 216 ℃ and 219 ℃, the temperature of the front section of the charging barrel is controlled in three sections, the temperature is respectively controlled at 223 ℃, 227 ℃ and 230 ℃, the blow-up ratio is 1.8, the rotating speed of a screw is 35r/min, and the traction speed is 38 m/min;
(3) the average efficiency is 120 pieces/h, every 60 pieces are used as a stacking, the laid PP film formaldehyde-free plate is placed in a cold press for prepressing, and the prepressing is carried out for 48min under the prepressing pressure of 8 MPa;
(4) after the pre-pressing is finished, the plate is moved to a hot press for hot pressing, and the plate is hot pressed for 48min under the hot pressing pressure of 9MPa and the hot pressing temperature of 105 ℃;
(5) and (4) after the hot pressing is finished, edge sawing is carried out on the board to obtain the PP film veneering decorative formaldehyde-free ecological board with high tensile strength.
Comparative example 1
The process is basically the same as the process of coating the high-tensile-strength PP film on the aldehyde-free ecological plate in the example 2, except that the raw materials for preparing the aldehyde-free glue are lack of water and N, N-dimethylformamide.
Comparative example 2
The process was essentially the same as the process for coating the high tensile strength PP film on the aldehyde-free ecological plate of example 2, except that the raw materials for preparing the aldehyde-free glue were deficient in water.
Comparative example 3
The process was essentially the same as the process for finishing the aldehyde-free ecological board covered high tensile strength PP film of example 2, except that N, N-dimethylformamide was absent from the raw materials used to prepare the aldehyde-free glue.
Comparative example 4
The process is substantially the same as the process of coating the formaldehyde-free ecological board with the high tensile strength PP film in example 2, except that the formaldehyde-free glue is prepared by the processes described in specific examples 1-5 in Chinese patent application document "formaldehyde-free adhesive for artificial boards and its preparation method (application publication No. CN 111303798A)".
Comparative example 5
The process is substantially the same as the process for coating the high-tensile-strength PP film on the aldehyde-free ecological plate in example 2, except that soybean peptide powder, sodium carboxymethylcellulose and polylysine are absent in the raw materials for preparing the PP film.
Comparative example 6
The process was essentially the same as the process for finishing the aldehyde-free ecological board covered high tensile strength PP film of example 2, except that the raw material for making the PP film was devoid of soy peptide powder.
Comparative example 7
The process was essentially the same as the process for finishing the aldehyde-free ecological plate-coated high tensile strength PP film of example 2, except that the raw material for making the PP film was devoid of sodium carboxymethyl cellulose.
Comparative example 8
The process was essentially the same as the process for finishing the aldehyde-free ecological board covered high tensile strength PP film of example 2, except that polylysine was absent from the raw materials used to make the PP film.
Comparative example 9
The process is substantially the same as the process for coating the high tensile strength PP film on the formaldehyde-free ecological plate in example 2, except that the PP film is prepared by the process described in specific examples 1-5 in the Chinese patent application document "a high temperature resistant, aging resistant and degradation resistant controllable PP film and the preparation method thereof (application publication No. CN 104277335A)".
(I) detection of Formaldehyde-free glue Performance
The viscosities and free formaldehyde of the aldehyde-free glues obtained in examples 1 to 3 and comparative examples 1 to 4 were measured and the results are shown in the following table.
Test group Viscosity (Pa. S) Free formaldehyde (g/kg)
Example 1 50.6 0
Example 2 58.7 0
Example 3 55.4 0
Comparative example 1 25.6 0
Comparative example 2 45.3 0
Comparative example 3 42.1 0
Comparative example 4 36.8-39.0 0
From the above table, it can be seen that: (1) as can be seen from the data of examples 1-3 and comparative example 4, the viscosities of the aldehyde-free glues obtained in examples 1-3 are significantly higher than the viscosity of the aldehyde-free glue obtained in comparative example 4 (prior art), at least higher than 29.7%; the free formaldehyde of the non-formaldehyde glues obtained in examples 1 to 3 were all 0g/kg, as compared to the free formaldehyde of the non-formaldehyde glue obtained in comparative example 4 (prior art), indicating that the technology of the present invention is significantly advanced and inventive.
(2) As can be seen from the data of example 2 and comparative examples 1-3, water, N-dimethylformamide, act synergistically in the preparation of the aldehyde-free glue, synergistically increasing the viscosity of the aldehyde-free glue because: and e, adding water into the neutralization salt obtained in the step d for high-speed shearing emulsification, fully dispersing the neutralization salt emulsification, and then adding N, N-dimethylformamide with extremely high activity in the step e for rapidly promoting and increasing the chain extension reaction, so that the viscosity of the finally obtained product is improved.
(II) PP film Performance test
PP films were produced according to the processes of examples 1 to 3 and comparative examples 5 to 9, and the tensile strength was measured, the tensile strength being carried out in accordance with DIN EN ISO527-2 at a speed of 50mm/min, the results being shown in the following table.
Test group Tensile Strength (MPa)
Example 1 56.2
Example 2 60.3
Example 3 58.7
Comparative example 5 35.1
Comparative example 6 53.1
Comparative example 7 54.5
Comparative example 8 52.0
Comparative example 9 35.9-42.4
From the above table, it can be seen that: (1) as can be seen from the data of examples 1-3 and comparative example 9, the tensile strength of the PP films prepared in examples 1-3 is significantly higher than that of comparative example 9 (prior art), at least higher than 32.5%; meanwhile, as can be seen from the data of examples 1 to 3, example 2 is the most preferred example.
(2) As can be seen from the data of example 2 and comparative examples 5 to 8, the soybean peptide powder, sodium carboxymethyl cellulose, and polylysine act synergistically in preparing the PP film, synergistically increasing the tensile strength of the PP film, because:
the soybean peptide powder has extremely good dispersibility, can improve the fluidity of a PP film in the extrusion film blowing process of a plastic film blowing machine, has good thermal stability, can promote the thermal stability of sodium carboxymethyl cellulose, and can greatly improve the elasticity of the PP film by the gelation property when the soybean peptide powder is dispersed in the PP film so as to improve the tensile strength. In addition, sodium carboxymethylcellulose also has a hyperfine reticular structure and good compatibility, and can form a three-dimensional reticular structure when being used with the soybean peptide powder, so that a more stable structure is formed, and the tensile strength is further improved. The polylysine is added into the PP film prepared by the invention, so that the organic combination of the sodium carboxymethylcellulose and the soybean peptide powder can be promoted, and the polylysine can also perform acylation with the peptide bond of the soybean peptide powder and the active hydroxyl of the sodium carboxymethylcellulose to form a more stable structure, so that the tensile strength can be further improved. Therefore, under the synergistic effect of the soybean peptide powder, the sodium carboxymethyl cellulose and the polylysine, the tensile strength of the PP film is synergistically improved.
(III) high tensile strength PP film veneered decorative formaldehyde-free ecological board performance detection
The physical and mechanical properties of the high tensile strength PP film veneered decorative formaldehyde-free ecological board manufactured in examples 1-3 and comparative examples 4 and 9 were tested according to the standard GB/T17657-1999 (test method for physical and chemical properties of artificial boards and veneered artificial boards), and the test results are shown in the following table.
Test group Water content (%) Surface bonding Strength (MPa)
Example 1 1.4 2.6
Example 2 1.2 2.9
Example 3 1.3 2.8
Comparative example 4 1.2-1.5 1.5-2.1
Comparative example 9 1.0-1.6 1.8-2.2
From the above table, it can be seen that: as can be seen from the data of examples 1-3 and comparative example 4, the surface bonding strength of the high tensile strength PP film faced decorative formaldehyde-free ecological plate prepared in examples 1-3 is significantly higher than that of the PP film faced decorative plate prepared in comparative example 4 (prior art), at least higher than 23.8%; the water content is equivalent to comparative example 4 (prior art); as can be seen from the data of examples 1-3 and comparative example 9, the surface bonding strength of the high tensile strength PP film faced decorative formaldehyde-free ecological plate prepared in examples 1-3 is significantly higher than that of the PP film faced decorative plate prepared in comparative example 9 (prior art), at least higher than 18.2%; the water content was equivalent to comparative example 9 (prior art); the PP film veneering decorative board prepared by the formaldehyde-free adhesive has excellent performance.
The above description should not be taken as limiting the invention to the embodiments, but rather, as will be apparent to those skilled in the art to which the invention pertains, numerous simplifications or substitutions may be made without departing from the spirit of the invention, which shall be deemed to fall within the scope of the invention as defined by the claims appended hereto.

Claims (8)

1. The process for coating the high-tensile-strength PP film veneer on the formaldehyde-free ecological plate is characterized by comprising the following steps of:
(1) the prepared multilayer solid wood board base material is matched with aldehyde-free glue, and the aldehyde-free glue is uniformly coated on the front surface and the back surface of the base material after the base material is subjected to a double-shaft gluing machine;
the formaldehyde-free glue comprises the following raw materials: polyether triol, tetramethyl glutaric acid, propyl formate, butanone, triisopropanolamine, water, N-dimethylformamide and N-butanol, wherein the weight ratio of the water to the N, N-dimethylformamide is (45-70): (15-22);
(2) pushing a base material plate at the front end of a laminator to carry out laminating, then connecting a laminating plate and laying a PP film at the rear end of the laminator, arranging a long-side and short-plate backer on a lifting table for plate stacking, then laying a bottom PP film firstly, then laying the laminating plate to the stacking lifting table horizontally, and laying the front PP film in a reciprocating manner;
the PP film comprises the following raw materials in parts by weight: 82-100 parts of polypropylene particles, 12-16 parts of lecithin, 3-5 parts of glass fiber, 13-18 parts of cassava starch, 10761.2-3 parts of antioxidant, 2-4 parts of potassium sulfide, 3-6 parts of pentaerythritol, 1.2-2 parts of zinc stearate, 3-7 parts of soybean peptide powder, 1.6-2.5 parts of sodium carboxymethylcellulose and 2-4 parts of polylysine;
the preparation method of the PP film comprises the following steps:
step one, adding polypropylene particles, lecithin, tapioca starch, potassium sulfide, pentaerythritol, soybean peptide powder, sodium carboxymethylcellulose and polylysine into a reaction kettle, stirring and reacting at the temperature of 192-;
step two, reducing the temperature of the mixture a to 75-85 ℃, then adding the rest components into the mixture a obtained in the step one, and stirring at the speed of 300r/min for 90-120min to obtain a mixture b;
thirdly, putting the mixture b obtained in the second step into a double-screw extruder for extrusion and granulation to obtain master batches, wherein the extrusion and granulation conditions are that the temperature of the rear section of a double-screw extruder barrel is controlled in three sections and is respectively controlled at 218 ℃ of 202-;
extruding and blowing the master batch obtained in the step three by using a plastic film blowing machine to obtain a PP film, wherein the temperature of the rear section of a charging barrel of the film blowing machine is controlled in three sections, respectively controlled at 212-219 ℃, the temperature of the front section of the charging barrel is controlled in three sections, respectively controlled at 221-230 ℃, the blow-up ratio is 1.6-1.9, the rotating speed of a screw is 25-35r/min, and the traction speed is 30-40 m/min;
(3) placing the laid PP film formaldehyde-free plate in a cold press for prepressing;
(4) after the pre-pressing is finished, the plate is moved to a hot press for hot pressing;
(5) and (4) after the hot pressing is finished, edge sawing is carried out on the board to obtain the PP film veneering decorative formaldehyde-free ecological board with high tensile strength.
2. The process for coating the aldehyde-free ecological plate with the high-tensile-strength PP film according to claim 1, wherein the aldehyde-free glue in the step (1) comprises the following raw materials in parts by weight: 40-60 parts of polyether triol, 16-25 parts of tetramethyl glutaric acid, 12-20 parts of propyl formate, 30-50 parts of butanone, 9-17 parts of triisopropanolamine, 45-70 parts of water, 15-22 parts of N, N-dimethylformamide and 8-14 parts of N-butanol.
3. The process for coating the high-tensile-strength PP film on the aldehyde-free ecological plate according to claim 2, wherein the preparation method of the aldehyde-free glue comprises the following steps:
a. adding 40-60 parts by weight of polyether triol and 16-25 parts by weight of tetramethyl glutaric acid into a reaction kettle, and carrying out polymerization reaction for 1-1.5h at the temperature of 76-93 ℃ and the microwave power of 100-200W until the reaction is finished;
b. b, adding 12-20 parts of propyl formate and 30-50 parts of butanone into the reaction kettle after the reaction in the step a, and carrying out dilution reflux reaction for 2-3h at the temperature of 65-70 ℃ to obtain a reaction solution;
c. cooling the reaction liquid prepared in the step b to 43-48 ℃, and adding 9-17 parts of triisopropanolamine for neutralization to form salt;
d. adding 45-70 parts of water into the neutralized salt obtained in the step c at the rotating speed of 2000-3000r/min, and stirring and emulsifying for 20-30min to obtain an emulsion;
e. adding 15-22 parts of N, N-dimethylformamide into the emulsion prepared in the step d to carry out chain extension reaction for 40-60min to prepare a chain extension reactant;
f. and e, adding 8-14 parts of n-butyl alcohol into the chain extension reactant prepared in the step e for end capping reaction for 1.2-2 hours to prepare the aldehyde-free adhesive.
4. The process for coating the PP film with high tensile strength on the aldehyde-free ecological plate as claimed in claim 3, wherein the coating amount of the aldehyde-free glue is 137-146g/m3。
5. The process for coating the aldehyde-free ecological plate with the high-tensile-strength PP film according to claim 1, wherein the PP film in the step (2) comprises the following raw materials in parts by weight: 94 parts of polypropylene particles, 14 parts of lecithin, 4 parts of glass fiber, 15 parts of cassava starch, 10762.3 parts of antioxidant, 3 parts of potassium sulfide, 5 parts of pentaerythritol, 1.5 parts of zinc stearate, 5 parts of soybean peptide powder, 2 parts of sodium carboxymethylcellulose and 3 parts of polylysine.
6. The process for finishing the aldehyde-free ecological plate coated with the high-tensile-strength PP film according to claim 1, wherein the average efficiency of laying the PP film aldehyde-free plate in the step (3) is 120 pieces/h.
7. The process for coating the high-tensile-strength PP film on the aldehyde-free ecological plate according to claim 1, wherein the pre-pressing in the step (3) is performed at a pre-pressing pressure of 6-8MPa for 48-62 min.
8. The process for coating the aldehyde-free ecological plate with the PP film with high tensile strength according to claim 1, wherein the step (4) is carried out by hot pressing at a hot pressing pressure of 7-9MPa and a hot pressing temperature of 93-105 ℃ for 48-60 min.
CN202011497288.XA 2020-12-17 2020-12-17 Formaldehyde-free ecological plate coated high-tensile-strength PP film facing process Active CN112706237B (en)

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CN103012733A (en) * 2012-12-19 2013-04-03 青岛海尔软件有限公司 Method for preparing mono-component normal-temperature self-crosslinking water-based polyurethane
CN104277335A (en) * 2014-09-24 2015-01-14 苏州博利迈新材料科技有限公司 High-temperature-resistant anti-aging degradable controllable PP membrane and preparation method thereof
CN104829811A (en) * 2015-04-30 2015-08-12 安吉县广泰化工纸业有限公司 Preparation process for aqueous polyurethane resin
DK3053947T3 (en) * 2015-02-06 2018-01-08 Synbra Tech B V PROCEDURE FOR MANUFACTURING FOAM COMPONENTS
CN110053125A (en) * 2019-04-08 2019-07-26 浙江云峰莫干山地板有限公司 A kind of soybean is without aldehyde glue, PP film veneer composite floor board and preparation method thereof
CN111635544A (en) * 2020-05-28 2020-09-08 蚌埠学院 Edible film treatment method for meat preservation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103012733A (en) * 2012-12-19 2013-04-03 青岛海尔软件有限公司 Method for preparing mono-component normal-temperature self-crosslinking water-based polyurethane
CN104277335A (en) * 2014-09-24 2015-01-14 苏州博利迈新材料科技有限公司 High-temperature-resistant anti-aging degradable controllable PP membrane and preparation method thereof
DK3053947T3 (en) * 2015-02-06 2018-01-08 Synbra Tech B V PROCEDURE FOR MANUFACTURING FOAM COMPONENTS
CN104829811A (en) * 2015-04-30 2015-08-12 安吉县广泰化工纸业有限公司 Preparation process for aqueous polyurethane resin
CN110053125A (en) * 2019-04-08 2019-07-26 浙江云峰莫干山地板有限公司 A kind of soybean is without aldehyde glue, PP film veneer composite floor board and preparation method thereof
CN111635544A (en) * 2020-05-28 2020-09-08 蚌埠学院 Edible film treatment method for meat preservation

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