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CN-119978669-B - Moisture-proof PVC wood grain sheet and preparation method thereof

CN119978669BCN 119978669 BCN119978669 BCN 119978669BCN-119978669-B

Abstract

The invention discloses a moistureproof PVC wood grain sheet and a preparation method thereof, belonging to the technical field of PVC wood grain sheet production. The moisture-proof PVC wood grain sheet consists of, by weight, 90-100 parts of PVC resin, 25-30 parts of acetyl triethyl citrate, 20-25 parts of modified moisture-proof microcapsules, 10-15 parts of moisture-proof coating liquid, 4-8 parts of tricresyl phosphate, 3-5 parts of stabilizer, 3-5 parts of wood grain color master batch, 0.5-1 part of calcium stearate and 0.1-1 part of light stabilizer 944. The PVC wood grain sheet prepared by the invention has good mechanical property and moisture resistance.

Inventors

  • WANG XIANGYANG
  • MAO CHENXIN
  • Mao Shougao
  • Mao Shengjia

Assignees

  • 浙江标隆新材料有限公司

Dates

Publication Date
20260505
Application Date
20250327

Claims (7)

  1. 1. The moistureproof PVC wood grain sheet is characterized by comprising, by weight, 90-100 parts of PVC resin, 25-30 parts of acetyl triethyl citrate, 20-25 parts of modified moistureproof microcapsules, 10-15 parts of moistureproof coating liquid, 4-8 parts of tricresyl phosphate, 3-5 parts of stabilizer, 3-5 parts of wood grain color master batch, 0.5-1 part of calcium stearate and 0.1-1 part of light stabilizer 944, wherein the modified moistureproof microcapsules are prepared by mixing and emulsifying beeswax and linseed oil, coating silicon dioxide and then carrying out surface modification, and the moistureproof coating liquid is prepared by dispersing the modified moistureproof microcapsules in plant extracts and organosiloxane hydrolysate after modifying nanoparticles, and adding a leveling agent and a defoaming agent; The preparation method of the modified dampproof microcapsule comprises the following steps: s1, melting beeswax, adding linseed oil, stirring, pouring into a sodium dodecyl benzene sulfonate aqueous solution, and emulsifying by using a high-speed shearing emulsifying machine to obtain an emulsion; s2, dripping tetraethoxysilane into the emulsion, adding ammonia water to adjust pH after dripping, stirring in a water bath for reaction, centrifuging to obtain precipitate, washing, and drying to obtain the moistureproof microcapsule; s3, dispersing the moistureproof microcapsule in absolute ethyl alcohol, pouring the moistureproof microcapsule into silane coupling solution I, stirring in water bath for reaction, centrifuging to obtain precipitate, washing and drying to obtain modified moistureproof microcapsule; The preparation method of the moisture-proof coating liquid comprises the following steps: q1, adding the nano particles into silane coupling solution II, stirring for reaction, centrifuging, washing and drying to obtain modified nano particles; Q2, adding the plant extract into the organosiloxane hydrolysate, stirring, adding modified nanoparticles, performing ultrasonic dispersion, adding a leveling agent and a defoaming agent, and stirring to obtain a modified dampproof coating liquid; the preparation method of the moistureproof PVC wood grain sheet comprises the following steps: (1) Sequentially adding PVC resin, a stabilizer, acetyl triethyl citrate, a modified dampproof microcapsule, tricresyl phosphate, wood grain color master batch, calcium stearate and a light stabilizer 944 into a high-speed mixer, and stirring at a low speed and then at a high speed to obtain a mixture; (2) Preheating a double-screw extruder, conveying, melting and plasticizing the mixture, extruding the mixture into sheet-shaped PVC (polyvinyl chloride) from a die head, calendaring, cleaning the surface, then coating moisture-proof coating liquid on the surface of the sheet-shaped PVC by using a roller coater, drying and solidifying, finally embossing by using a wood grain embossing roller, cooling, rolling and curing in a ventilation environment to obtain the PVC wood grain sheet.
  2. 2. The moisture-proof PVC wood grain sheet according to claim 1, wherein the stabilizer is a mixture of zinc stearate, zinc acetylacetonate and monophenyldiisooctyl phosphite in a mass ratio of 4-5:1-2:1.
  3. 3. The moisture-proof PVC wood grain sheet according to claim 1, wherein the melting temperature of the beeswax in S1 is 62-67 ℃, the mass ratio of the beeswax to the linseed oil is 1:2-3, the mass volume ratio of the beeswax to the sodium dodecylbenzenesulfonate aqueous solution is 1:300-400, and the mass concentration of the sodium dodecylbenzenesulfonate aqueous solution is 1-2wt%.
  4. 4. The moisture-proof PVC wood grain sheet according to claim 1, wherein the mass ratio of the ethyl orthosilicate to the beeswax in S2 is 3-5:1, the concentration of ammonia water is 0.1-0.5mol/L, and the pH value is adjusted to 8-9.
  5. 5. The moisture-proof PVC wood grain sheet according to claim 1, wherein the mass-volume ratio of the moisture-proof microcapsules to the absolute ethyl alcohol in the S3 is 1:5-10, the mass concentration of the silane coupling solution I is 2-5wt%, the moisture-proof PVC wood grain sheet is obtained by adding KH560 into the absolute ethyl alcohol, adjusting the pH value to 4-5 with acetic acid, and standing for 30-60min, and the mass-volume ratio of the moisture-proof microcapsules to the silane coupling solution I is 1:5-10.
  6. 6. The moistureproof PVC wood grain sheet according to claim 1, wherein the nano particles in Q1 are obtained by mixing nano titanium dioxide and nano zinc oxide according to a mass ratio of 1:1, wherein the silane coupling solution II is an absolute ethanol solution of KH550 with a mass ratio of 2-5wt%, the nano particles and the silane coupling solution II are obtained by mixing a lavender extract and a tea tree oil extract according to a mass ratio of 2:1-2, the organic siloxane hydrolysate is obtained by adding organic siloxane into absolute ethanol, deionized water is dropwise added, 0.1wt% of dibutyl tin dilaurate is added, stirring and reacting for 2-4h under the condition of 45-50 ℃, the organic siloxane is a mixture of methyltrimethoxysilane and vinyltrimethoxysilane, the molar ratio of methyltrimethoxysilane to vinyltrimethoxysilane is 2-3:1, the volume ratio of the organic siloxane to ethanol is 1:2-3, the molar ratio of deionized water to the organic siloxane is 3-4:1, the mass ratio of the plant extract to the hydrolysate is 1:20, the leveling agent is a foam killer 1.80, and the leveling agent is a mixture of the water hydrolysate is 0.80:0.80.
  7. 7. The moisture-proof PVC wood grain sheet according to claim 1, wherein the low-speed stirring speed in the step (1) is 100-200r/min, the low-speed stirring time is 3-5min, the high-speed stirring speed is 500-800r/min, the high-speed stirring time is 10-15 min, the high-speed stirring temperature is 80-100 ℃, the feeding section temperature in the step (2) is 140-160 ℃, the compression section temperature is 170-180 ℃, the homogenization section temperature is 180-190 ℃, the extrusion speed is 5-15m/min, the roller temperature of a calender is 170-180 ℃, the pressure of a coating roller is 0.2MPa, the rotating speed of the coating roller is 20r/min, the thickness of a coating is 15-20 μm, the temperature of an embossing roller is 120-130 ℃, and the embossing pressure is 1.5-2MPa.

Description

Moisture-proof PVC wood grain sheet and preparation method thereof Technical Field The invention belongs to the technical field of PVC wood grain sheet production, and particularly relates to a moistureproof PVC wood grain sheet and a preparation method thereof. Background The PVC wood grain sheet is a decorative sheet with wood grain pattern on the surface, which is made of polyvinyl chloride (Polyvinyl Chloride, PVC for short) as main material by special process. With the increasing demands of people on home and public decoration, wood grain decoration is favored for natural and attractive textures and visual effects. The traditional wood decoration is attractive, but has the problems of high cost, limited resources and the like. Finding an economical and environmentally friendly alternative is becoming a focus of market attention. PVC wood grain sheet is used as plastic board with wood grain imitation effect, and is widely applied in the fields of indoor decoration, furniture manufacture, office decoration and the like. The moisture resistance is one of the important performance indexes of the PVC wood grain sheet. In a humid environment, if the moisture resistance of the PVC wood grain sheet is poor, the PVC wood grain sheet is easy to cause water absorption expansion, deformation and even cracking of the PVC wood grain sheet, thereby influencing the service life and the decorative effect of the PVC wood grain sheet. Therefore, the invention develops the dampproof PVC wood grain sheet and the preparation method thereof, which are used for solving the technical problems of preventing moisture invasion, reducing deformation and mildew and improving the dampproof performance of the wood grain sheet in the prior art under the moist environment. Disclosure of Invention The invention aims to provide a moistureproof PVC wood grain sheet and a preparation method thereof, which are used for solving the technical problems of preventing moisture invasion, reducing deformation and mildew and improving the moistureproof performance of the wood grain sheet in the prior art under a humid environment. In order to achieve the above purpose, the present invention adopts the following technical scheme: The moisture-proof PVC wood grain sheet comprises, by weight, 90-100 parts of PVC resin, 25-30 parts of acetyl triethyl citrate, 20-25 parts of modified moisture-proof microcapsules, 10-15 parts of moisture-proof coating liquid, 4-8 parts of tricresyl phosphate, 3-5 parts of stabilizers, 3-5 parts of wood grain color master batches, 0.5-1 part of calcium stearate and 0.1-1 part of light stabilizer 944, wherein the modified moisture-proof microcapsules are prepared by mixing and emulsifying beeswax and linseed oil, coating silicon dioxide and carrying out surface modification, and the moisture-proof coating liquid is prepared by dispersing the modified nano particles in plant extracts and organosiloxane hydrolysate and adding a leveling agent and a defoaming agent. Further, the stabilizer is a mixture of zinc stearate, zinc acetylacetonate and monobenzene diisooctyl phosphite, and the mass ratio of the zinc stearate to the zinc acetylacetonate to the monobenzene diisooctyl phosphite is 4-5:1-2:1. Further, the preparation method of the modified dampproof microcapsule comprises the following steps: s1, melting beeswax, adding linseed oil, stirring, pouring into a sodium dodecyl benzene sulfonate aqueous solution, and emulsifying by using a high-speed shearing emulsifying machine to obtain an emulsion; s2, dripping tetraethoxysilane into the emulsion, adding ammonia water to adjust pH after dripping, stirring in a water bath for reaction, centrifuging to obtain precipitate, washing, and drying to obtain the moistureproof microcapsule; s3, dispersing the moistureproof microcapsule in absolute ethyl alcohol, pouring the moistureproof microcapsule into silane coupling solution I, stirring in water bath for reaction, centrifuging to obtain precipitate, washing and drying to obtain the modified moistureproof microcapsule. Further, the melting temperature of the beeswax in the S1 is 62-67 ℃, the mass ratio of the beeswax to the linseed oil is 1:2-3, the stirring speed is 200-300r/min, the stirring time is 10-15min, the mass volume ratio of the beeswax to the sodium dodecyl benzene sulfonate aqueous solution is 1:300-400, the mass concentration of the sodium dodecyl benzene sulfonate aqueous solution is 1-2wt%, the rotating speed of an emulsifying machine is 4000-5000r/min, and the emulsifying time is 15-20min; Further, the mass ratio of the tetraethoxysilane to the beeswax in the S2 is 3-5:1, the dropping speed is 1-2 drops/min, the concentration of ammonia water is 0.1-0.5mol/L, the pH value is regulated to 8-9, the water bath temperature is 30-40 ℃, the stirring speed is 300-400r/min, the stirring reaction time is 3-4h, the centrifugation speed is 3000-4000r/min, the centrifugation time is 10-15min, the deionized water is used for