WO2018133722A1 - 一种覆有asa膜的pvc片材及其覆膜方法 - Google Patents

一种覆有asa膜的pvc片材及其覆膜方法 Download PDF

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Publication number
WO2018133722A1
WO2018133722A1 PCT/CN2018/072122 CN2018072122W WO2018133722A1 WO 2018133722 A1 WO2018133722 A1 WO 2018133722A1 CN 2018072122 W CN2018072122 W CN 2018072122W WO 2018133722 A1 WO2018133722 A1 WO 2018133722A1
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Prior art keywords
pvc sheet
asa
film
asa film
coating method
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PCT/CN2018/072122
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English (en)
French (fr)
Inventor
安小革
安俸伶
Original Assignee
深圳毅彩鸿翔新材料科技有限公司
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Publication of WO2018133722A1 publication Critical patent/WO2018133722A1/zh

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Classifications

    • 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
    • B29C48/07—Flat, e.g. panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/02—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive

Definitions

  • the invention belongs to the technical field of plastic processing and molding, and particularly relates to a PVC sheet coated with an ASA film and a coating method thereof.
  • the PVC sheet is mainly composed of a PVC resin.
  • the processing method of PVC sheet is mainly extrusion molding.
  • PVC sheets have good tensile properties and ductility, but are easily deformed by heat, have poor UV resistance, and are prone to aging outdoors.
  • ASA is a terpolymer composed of acrylonitrile (Acrylonitile), styrene (Styrene), and acrylic rubber (Acrylate). It is an impact-modified resin used as a co-extruded raw material in the PVC color coextrusion profile market. It has excellent weather resistance and is therefore the first choice for outdoor building materials.
  • Coextrusion is a major composite product forming process that combines several different properties of polymer materials by using two or more extruders to form in one machine head. Thereby obtaining a composite article.
  • the co-extrusion process is generally used to co-extrude the weather-resistant ASA plastic with the rigid PVC sheet, and the material is usually formed by a co-extrusion process.
  • the main machine extrudes PVC
  • the auxiliary machine extrudes the colored ASA.
  • the two machines are extruded in the extrusion die (the co-extruded layer ASA is on the main PVC).
  • the thickness of the middle portion and the two sides is difficult to maintain the thickness consistently due to the wide supply surface, which ultimately leads to uneven distribution of the AS A base film, which makes the weather resistance and UV resistance of the product unbalanced and will be directly reduced in the long term.
  • the product is fragile, the wind pressure resistance coefficient is low, there are safety hazards, affecting the service life of the product; the color fading is also inconsistent, affecting the visual effect, not beautiful, after changing the color, it is necessary to stop the cleaning screw, resulting in waste of raw materials, energy consumption It is exhausted and cannot be produced continuously.
  • the object of the present invention is to overcome the above-mentioned deficiencies of the prior art, and to provide an ASA film coating method for a P VC sheet with low energy consumption and stable quality control, which aims to solve the problem that the film distribution is not in the existing molding process.
  • Technical problems such as average, low efficiency and low life.
  • the present invention provides an ASA film coating method for a PVC sheet, the method comprising the following steps: [0007] obtaining an AS A film;
  • the ASA film is fixed on the film frame device, and the ASA film is thermocompression-bonded to the surface of the PVC sheet extruded from the extrusion die by a double roll coating technique to obtain a coating.
  • the preform of the PVC sheet of the ASA film wherein, the PVC sheet temperature is 100-250 ° C;
  • a preform of a PVC sheet coated with the ASA film was drawn to a sizing machine and compression molded.
  • the present invention provides a PVC sheet coated with an ASA film obtained by the ASA film coating method of the above PVC sheet.
  • the ASA film coating method of the PVC sheet provided by the present invention has the following advantages over the prior art:
  • the method utilizes the existing ASA film, directly adheres to the surface of the PVC sheet extruded from the extrusion die, through the temperature of the freshly extruded PVC sheet and the double roll embossing and subsequent molding
  • the pressure of the ASA film firmly adhered to the PVC sheet can effectively ensure the thickness uniformity and uniformity of the ASA film, and it is difficult to separate the ASA film from the sheet, thereby ultimately improving the service life of the product.
  • the ASA film-coated PVC sheet provided by the present invention because the ASA film directly adheres to the surface of the PVC sheet extruded from the extrusion die, passes through the temperature and double rolling of the PVC sheet just extruded The pressure of the embossing and the subsequent molding, the ASA film is firmly adhered to the PVC sheet, so the thickness uniformity and uniformity of the ASA film are greatly improved. High, and ultimately increased its service life.
  • FIG. 1 is a schematic flow chart of an ASA film coating method for a PVC sheet according to an embodiment of the present invention.
  • an ASA film coating method for a PVC sheet is provided. As shown in Figure 1, the method includes the following steps:
  • S02 the above ASA film is fixed on the film frame device, and the ASA film is thermocompression-bonded to the surface of the PVC sheet extruded from the extrusion die by a double roll coating technique to obtain an ASA film.
  • a preform of a PVC sheet wherein, the temperature of the PVC sheet is 100-250 ° C;
  • S03 The preform of the PVC sheet coated with the ASA film is drawn to a setting machine and molded.
  • the ASA film coating method of the above PVC sheet using the existing ASA film, directly adheres to the surface of the PVC sheet extruded from the extrusion die, through the temperature of the newly extruded PVC sheet and subsequent double Rolling embossing and compression molding pressure, the ASA film is firmly adhered to the PVC sheet, which can effectively ensure the thickness uniformity and uniformity of the ASA film, and it is difficult to separate the ASA film from the sheet, thereby ultimately improving the service life of the product.
  • the coating method does not use any adhesive extrusion (glue), so the process is environmentally friendly, can effectively save raw materials, and is pressed after the film is released, thereby effectively reducing energy consumption and energy saving.
  • glue adhesive extrusion
  • the preparation process of the ASA film is: arranging the ASA raw material through the extruder Out, casting, and double-rolling. After the product has been shaped, it can be packaged in the form of a package (the center can be a hollow paper tube or a hollow plastic tube or a hollow tube of other materials).
  • the ASA film may contain a colorant that renders the AS A film in any of red, yellow, and blue.
  • the AS A film is colored in red, yellow, blue, etc. to satisfy the appearance, and the ASA film has excellent weather resistance.
  • the length of the ASA film may be customized according to the requirements of a specific sheet, and the thickness of the ASA film may preferably be: 0.0 5-3 mm; specifically 0.05 mm, 0.1 mm, 0.2 mm, 0.5 mm, 1 mm, 2 mm, Any of 3 mm, in this preferred thickness range, can better adhere the AS A film to the surface of the PVC sheet, while maintaining the toughness, impact resistance and weather resistance of the ASA film; More preferably, the thickness of the ASA film is: 1-2 mm, and the overall performance is optimized within this range.
  • the temperature of the PVC sheet extruded from the extrusion die is 100 to 250 °C.
  • the PVC sheet in this step has just been extruded from an extruder (the best choice for a 65 or 80 taper double or flat twin screw machine).
  • the ASA film can be adhered to the surface of the PVC sheet.
  • the sheet temperature may specifically be any one of 10 ° C, 120 ° C, 150 ° C, 170 ° C, 200 ° C, 220 ° C, 250 ° C, and more preferably, the PVC sheet temperature It is 200-230 °C. In this preferred temperature range, the stability of the PVC sheet can be ensured, and the AS A film can be better adhered to the surface of the PVC sheet to obtain a high quality preform.
  • the double roll coating technique can be a double roll or a smooth double roll.
  • the ASA film is thermocompression bonded to one side or both sides of the PVC sheet.
  • AS A film can be adhered to one side of PVC sheet, which can basically meet the weather resistance and UV resistance of the product. In order to better improve product performance, it can be glued on both sides of PVC sheet. Cover the ASA film.
  • step S03 the PVC sheet preform coated with the ASA film is pulled to the setting machine by double rolling, and the ASA film and the PVC sheet are adhered under the hot pressing.
  • Stereotype the PVC sheet preform coated with the ASA film is pulled to the setting machine by double rolling, and the ASA film and the PVC sheet are adhered under the hot pressing.
  • the PVC sheet may be at least one of a composite plastic tile, a plastic steel profile, a wood plastic, a plate, and a sheet, which may be according to specific application requirements.
  • any practical PVC sheet is within the scope of the present invention.
  • the PVC sheet is a composite plastic tile
  • the double roll coating technology is a double roll, wherein the pattern is double rolled.
  • the gap between the two rolls is 0.02 mm smaller than the thickness of the composite plastic tile or equal to the thickness of the composite plastic tile. Under this condition, It can effectively improve the tensile strength of the ASA film and its adhesion to the composite plastic tile, ultimately improving the service life of the product.
  • a PVC sheet coated with an ASA film is also provided.
  • the ASA film is coated
  • the PVC sheet was obtained by the ASA filming method of the above PVC sheet.
  • a weatherability of PVC plastic tile material ASA film coating method comprising the following steps:
  • the process is: extruding, casting, and double-rolling the ASA raw material through an extruder, and having a thickness of 3 mm.
  • a film was heat-pressed on the surface of a PVC plastic tile extruded from an extrusion die to obtain a preform of a PVC sheet coated with a weather resistant ASA film.
  • the PVC plastic tile material was just extruded from an extruder type 80 conical twin screw machine with a sheet temperature of 250 °C.
  • S13 The pre-product of the above-mentioned PVC plastic tile covered with the weather resistant ASA film is drawn to a setting machine and molded. This process utilizes double roll traction to coat the PVC plastic tile of the weather resistant ASA film to the tile setting machine.
  • the ASA film coating method comprises the following steps:
  • the process is: extruding, casting, and double-rolling the ASA raw material through an extruder, and having a thickness of lmm
  • S22 fixing the weather-resistant ASA film on the laminating frame device, Double roll coating technology will weather resistant AS The A film was heat-pressed on the surface of the PVC plastic tile extruded from the extrusion die to obtain a preform of a PVC sheet coated with a weather resistant ASA film.
  • the PVC plastic tile material was just extruded from an extruder type 65 flat twin screw machine, and the sheet temperature was 200 °C.
  • S23 The preform of the above-mentioned PVC plastic tile covered with the weather resistant ASA film is drawn to a setting machine and molded. This process utilizes double roll traction to coat the PVC plastic tile of the weather resistant ASA film to the tile setting machine.
  • a weatherability of PVC plastic tile material ASA film coating method comprising the following steps:
  • the process is as follows: The ASA raw material is extruded through an extruder, cast, and double-rolled to a thickness of 0.05 mm.
  • a film was heat-pressed on the surface of a PVC plastic tile extruded from an extrusion die to obtain a preform of a PVC sheet coated with a weather resistant ASA film.
  • the PVC plastic tile material was just extruded from an extruder type 65 flat twin screw machine, and the sheet temperature was 100 °C.
  • S33 The preform of the above-mentioned PVC plastic tile covered with the weather resistant ASA film is drawn to a setting machine and molded. This process utilizes double roll traction to coat the PVC plastic tile of the weather resistant ASA film to the tile setting machine.
  • the ASA thickness at both ends of the PVC material may have a large deviation, resulting in non-uniformity; if the coextrusion material has a slightly less fluidity, the PVC material has two ends. Can't cover
  • the coating process provided by the embodiment can effectively ensure the thickness uniformity, uniformity and adhesive strength of the ASA film, and improve the service life of the product; and the ASA color ⁇ is replaced, and the PVC sheet is not required to be cleaned.
  • the material extruder does not affect its continuous productivity, energy saving and environmental protection, which can effectively reduce costs and improve production efficiency. The effect is significantly better than the prior art.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

一种覆有ASA膜的PVC片材及其覆膜方法。该方法包括如下步骤：获得ASA膜；将所述ASA膜固定在覆膜机架装置上，通过双滚压覆技术将所述ASA膜热压粘覆于从挤塑模头挤出的PVC片材表面，得到覆有所述ASA膜的PVC片材的预制品；其中，所述PVC片材温度为100-250℃；将覆有所述ASA膜的PVC片材的预制品牵引至定型机，并模压成型。该方法通过刚挤出的PVC片材的温度和双滚压纹以及后续模压成型的压力，将ASA膜牢牢粘附于PVC片材，能够有效保证ASA膜的厚度一致性、均匀性，提高产品使用寿命；同时节约时间，提高了生产效率，达到了节能降耗的目的。

Description

发明名称：一种覆有 ASA膜的 PVC片材及其覆膜方法 技术领域
[0001] 本发明属于塑胶加工成型技术领域， 具体涉及一种覆有 ASA膜的 PVC片材及其 覆膜方法。
背景技术
[0002] PVC片材主要由 PVC树脂组成。 PVC片材的加工方式主要是挤出成型。 PVC片 材具有很好的拉伸性能和延展性能， 但受热容易变形， 抗紫外线很差， 在户外 容易老化。 ASA是一种由丙烯腈 （Acrylonitile) 、 苯乙烯 （Styrene) 、 丙烯酸橡 胶 （Acrylate) 组成的三元聚合物， 属于抗冲改性树脂， 其作为共挤原材料应用 于 PVC彩色共挤型材市场， 具有优异的耐候性， 因此是户外建筑材料的首选。
[0003] 共挤成型是一种主要的复合材料制品成型加工技术， 其通过采用两台或多台挤 出机， 将几种不同特性的聚合物材料粘结在一起， 在一个机头中成型， 从而得 到复合材料制品。 目前， 一般采用共挤成型工艺将耐候性的 ASA塑胶与硬质 PVC 片材一起共挤覆膜成型， 通常采用共挤合流的工艺方式进行材料成型。 该工艺 中， 主机挤出 PVC， 辅机挤出带色彩的 ASA， 两机同吋挤出在挤塑模头内 （共挤 层 ASA在主机 PVC上口） 合流成型。 当大面积生产吋， 由于供给面较宽， 中间部 分和两边部分的厚度很难保持厚度一致， 最终导致产品 AS A基膜分布不均， 使 产品耐候性、 抗紫外线不均衡， 长期会直接降低产品的理化特性。 导致产品易 碎裂、 抗风压系数低， 存在安全隐患， 影响产品使用寿命； 其颜色退色也不一 致， 影响视觉效果， 不美观， 在换颜色吋， 需要停机清理螺杆， 造成原料浪费 ， 耗能耗吋， 不能连续生产。
技术问题
[0004] 本发明的目的在于克服现有技术的上述不足， 提供一种耗能低、 品控稳定的 P VC片材的 ASA覆膜方法， 旨在解决现有成型工艺中， 覆膜分布不均、 效率低、 寿命低等技术问题。 问题的解决方案
技术解决方案
[0005] 为实现上述发明目的， 本发明采用的技术方案如下：
[0006] 一方面， 本发明提供一种 PVC片材的 ASA覆膜方法， 所述方法包括如下步骤： [0007] 获得 AS A膜；
[0008] 将所述 ASA膜固定在覆膜机架装置上， 通过双滚压覆技术将所述 ASA膜热压粘 覆于从挤塑模头挤出的 PVC片材表面， 得到覆有所述 ASA膜的 PVC片材的预制品 ； 其中， 所述 PVC片材温度为 100-250°C;
[0009] 将覆有所述 ASA膜的 PVC片材的预制品牵引至定型机， 并模压成型。
[0010] 另一方面， 本发明提供一种覆有 ASA膜的 PVC片材， 所述覆有 ASA膜的 PVC片 材由上述 PVC片材的 ASA覆膜方法制得。
发明的有益效果
有益效果
[0011] 本发明提供的 PVC片材的 ASA覆膜方法相对现有技术， 具有如下优点：
[0012] 1.该方法利用现有的 ASA膜， 直接粘附于从挤塑模头挤出的 PVC片材表面， 通 过刚挤出的 PVC片材的温度和双滚压纹及后续模压成型的压力， 将 ASA膜牢牢粘 附于 PVC片材， 能够有效保证 ASA膜的厚度一致性、 均匀性， 不易使 ASA膜脱离 片材， 最终提高了产品使用寿命。
[0013] 2.由于 ASA膜粘附于 PVC片材过程中， 不使用任何粘合挤 （胶水） ， 因此该工 艺环保， 能有效节省原材料， 且在出膜之后即幵始压覆， 有效降低耗能， 节能
[0014] 3.原有共挤成型工艺中， 同吋使用 2个以上挤出机， 耗能大， 生产成本过高， 而 且在更换 ASA共挤层颜色吋， 必需要对共挤机进行清洗， 而本发明提供的方法 在更换 ASA基膜颜色吋， 无需清洗 PVC片材挤出机， 不影响其连续生产性， 减少 了物料的浪费， 节约了吋间， 可有效降低成本、 提高生产效率。
[0015] 本发明提供的覆有 ASA膜的 PVC片材， 因 ASA膜直接粘附于从挤塑模头挤出的 PVC片材表面， 通过刚挤出的 PVC片材的温度和双滚压纹及后续模压成型的压力 ， 将 ASA膜牢牢粘附于 PVC片材， 所以 ASA膜的厚度一致性、 均匀性得到很大提 高， 最终提高了其使用寿命。
对附图的简要说明
附图说明
[0016] 图 1是本发明实施例提供的 PVC片材的 ASA覆膜方法流程示意图。
本发明的实施方式
[0017] 为了使本发明要解决的技术问题、 技术方案及有益效果更加清楚明白， 以下结 合附图和实施例， 对本发明进行进一步详细说明。 应当理解， 此处所描述的具 体实施例仅仅用以解释本发明， 并不用于限定本发明。
[0018] 为了使本发明要解决的技术问题、 技术方案及有益效果更加清楚明白， 以下结 合附图和实施例， 对本发明进行进一步详细说明。 应当理解， 此处所描述的具 体实施例仅仅用以解释本发明， 并不用于限定本发明。
[0019] 本发明实施例一方面， 提供了一种 PVC片材的 ASA覆膜方法。 如图 1所示， 该 方法包括如下步骤：
[0020] S01 : 获得 AS A膜；
[0021] S02: 将上述 ASA膜固定在覆膜机架装置上， 通过双滚压覆技术将 ASA膜热压 粘覆于从挤塑模头挤出的 PVC片材表面， 得到覆有 ASA膜的 PVC片材的预制品； 其中， PVC片材温度为 100-250°C;
[0022] S03: 将覆有 ASA膜的 PVC片材的预制品牵引至定型机， 并模压成型。
[0023] 上述 PVC片材的 ASA覆膜方法， 利用现有的 ASA膜， 直接粘附于从挤塑模头挤 出的 PVC片材表面， 通过刚挤出的 PVC片材的温度和后续双滚压纹及模压成型的 压力， 将 ASA膜牢牢粘附于 PVC片材， 能够有效保证 ASA膜的厚度一致性、 均匀 性， 不易使 ASA膜脱离片材， 最终提高了产品使用寿命。 同吋， 该覆膜方法不 使用任何粘合挤 （胶水） ， 因此该工艺环保， 能有效节省原材料， 且在出膜之 后即幵始压覆， 有效降低耗能， 节能。 而且在更换 ASA基膜颜色吋， 无需清洗 P VC片材挤出机， 不影响其连续生产性， 可有效降低成本、 提高生产效率。 其效 果显著优于现有技术。
[0024] 具体地， 在上述步骤 S01中， ASA膜的制备过程为： 将 ASA原料通过挤出机挤 出、 流延， 并双滚定型。 产品定型后， 可以卷装的形式进行包装 （中心可以是 空心的纸筒或空心的塑料管或其他材质的空心管） 。
[0025] 根据复合材料的具体应用需求， 该 ASA膜可以含有着色剂， 所述着色剂使所述 AS A膜呈红色、 黄色和蓝色中的任意一种。 使 AS A膜具有红色、 黄色、 蓝色等 颜色， 以满足外观欣赏， 且该 ASA膜具有优异的耐候性。
[0026] 根据具体片材的需求， 可以自定 ASA膜的长度， 而该 ASA膜厚度可优选为： 0.0 5-3mm; 具体为 0.05mm、 0.1mm、 0.2mm、 0.5mm、 lmm、 2mm、 3mm中的任意 一种， 在该优选的厚度范围内， 既可以使 AS A膜更好地粘附于 PVC片材表面， 同 吋又可以保持 ASA膜的韧性、 耐冲击性和耐候性等； 更优选地， 所述 ASA膜的 厚度为： l-2mm， 在该范围内其综合性能达到最优。
[0027] 具体地， 在上述步骤 S02中， 从挤塑模头挤出的 PVC片材的温度为 100-250°C。
此步骤中的 PVC片材， 刚从挤出机 （65型或 80型锥双或平双螺杆机为最佳选择） 挤出， 利用片材温度， 可使 ASA膜粘附于 PVC片材表面。 片材温度具体可以为 10 0°C、 120°C、 150°C、 170°C、 200°C、 220°C、 250°C中的任意一种， 更优选地， 所述 PVC片材温度为 200-230°C。 在该优选的温度范围内既可以保证 PVC片材的 稳定性， 还可以使 AS A膜能更好地粘附于 PVC片材表面， 得到优质的预制品。 该 步骤中， 双滚压覆技术可以为花纹双滚或光面双滚。
[0028] 具体地， 在上述步骤 S02中， ASA膜热压粘覆于 PVC片材的一面或双面。 根据 P VC片材的需求， AS A膜可以粘覆于 PVC片材一面， 基本可以满足产品的耐候性 和抗紫外性， 为了更好的提高产品性能， 可以在 PVC片材的双面都粘覆 ASA膜。
[0029] 具体地， 在上述步骤 S03中过程中， 通过双滚将覆有 ASA膜的 PVC片材预制品 牵弓 I至定型机， 并让 ASA膜与 PVC片材在该热压下粘附定型。
[0030] 具体地， 在上述 PVC片材的 ASA覆膜方法中， 该 PVC片材可以为复合塑料瓦片 、 塑钢型材、 木塑、 板材、 片材中的至少一种， 可根据具体应用需求选择， 任 何实用的 PVC片材都在本发明保护范围内。
[0031] 在本发明实施例一个优选方案中， 该 PVC片材为复合塑料瓦片， 且在该复合塑 料瓦片覆膜过程中， 双滚压覆技术为花纹双滚， 其中花纹双滚的两滚之间间隙 比复合塑料瓦片的厚度小 0.02mm或与复合塑料瓦片的厚度相等。 在该条件下， 可以有效提高该 ASA膜的拉伸强度， 以及其与复合塑料瓦片的黏附作用， 最终 提高产品的使用寿命。
[0032] 本发明实施例另一方面， 还提供一种覆有 ASA膜的 PVC片材。 该覆有 ASA膜的
PVC片材由上述 PVC片材的 ASA覆膜方法制得。
[0033] 上述覆有 ASA膜的 PVC片材， 因 AS A膜直接粘附于从挤塑模头挤出的 PVC片材 表面， 通过刚挤出的 PVC片材的温度和双滚压纹和后续模压成型的压力， 将 ASA 膜牢牢粘附于 PVC片材， 所以 ASA膜的厚度一致性、 均匀性得到很大提高， 最终 提高了其使用寿命。
[0034] 本发明先后进行过多次试验， 现举一部分试验结果作为参考对发明进行进一步 详细描述， 下面结合具体实施例进行详细说明。
[0035] 实施例 1
[0036] 一种 PVC塑料瓦片材的耐候性 ASA覆膜方法， 包括如下步骤：
[0037] S11 : 获得耐候性 ASA膜。
[0038] 该过程为： 将 ASA原料通过挤出机挤出、 流延， 并双滚定型而成， 厚度为 3mm
[0039] S12: 将耐候性 ASA膜固定在覆膜机架装置上， 通过双滚压覆技术将耐候性 AS
A膜热压粘覆于从挤塑模头挤出的 PVC塑料瓦片材表面， 得到覆有耐候性 ASA膜 的 PVC片材的预制品。
[0040] 该 PVC塑料瓦片材刚从挤出机 80型锥双螺杆机挤出， 片材温度为 250°C。
[0041] S13: 将上述覆有耐候性 ASA膜的 PVC塑料瓦片材的预制品牵引至定型机， 并 模压成型。 该过程利用双滚牵引粘覆耐候性 ASA膜的 PVC塑料瓦片材至瓦片定型 机。
[0042] 实施例 2
[0043] 一种 PVC塑料瓦片材的耐候性 ASA覆膜方法， 包括如下步骤：
[0044] S21 : 获得耐候性 ASA膜。
[0045] 该过程为： 将 ASA原料通过挤出机挤出、 流延， 并双滚定型而成， 厚度为 lmm [0046] S22: 将耐候性 ASA膜固定在覆膜机架装置上， 通过双滚压覆技术将耐候性 AS A膜热压粘覆于从挤塑模头挤出的 PVC塑料瓦片材表面， 得到覆有耐候性 ASA膜 的 PVC片材的预制品。
[0047] 该 PVC塑料瓦片材刚从挤出机 65型平双螺杆机挤出， 片材温度为 200°C。
[0048] S23: 将上述覆有耐候性 ASA膜的 PVC塑料瓦片材的预制品牵引至定型机， 并 模压成型。 该过程利用双滚牵引粘覆耐候性 ASA膜的 PVC塑料瓦片材至瓦片定型 机。
[0049] 实施例 3
[0050] 一种 PVC塑料瓦片材的耐候性 ASA覆膜方法， 包括如下步骤：
[0051] S31 : 获得耐候性 ASA膜。
[0052] 该过程为： 将 ASA原料通过挤出机挤出、 流延， 并双滚定型而成， 厚度为 0.05 mm。
[0053] S32: 将耐候性 ASA膜固定在覆膜机架装置上， 通过双滚压覆技术将耐候性 AS
A膜热压粘覆于从挤塑模头挤出的 PVC塑料瓦片材表面， 得到覆有耐候性 ASA膜 的 PVC片材的预制品。
[0054] 该 PVC塑料瓦片材刚从挤出机 65型平双螺杆机挤出， 片材温度为 100°C。
[0055] S33: 将上述覆有耐候性 ASA膜的 PVC塑料瓦片材的预制品牵引至定型机， 并 模压成型。 该过程利用双滚牵引粘覆耐候性 ASA膜的 PVC塑料瓦片材至瓦片定型 机。
[0056] 对比例
[0057] 现有共挤成型工艺： 将耐候性的 ASA塑胶与硬质 PVC片材一起采用共挤合流的 方式共挤覆膜成型， 主机挤出 PVC， 辅机挤出带色彩的 ASA， 两机同吋挤出在挤 塑模头内 （共挤层 ASA在主机 PVC上口） 合流成型。
[0058] 在本对比例中， 如果共挤材料流动性好， 则 PVC材料两端的 ASA厚度会出现一 定大的偏差， 造成不均一； 如果共挤材料流动性稍差些， 则 PVC材料两端覆不着
ASA。
[0059] 将上述实施例 1-3提供的覆膜工艺和对比例提供的现有共挤成型工艺进行性能 比较， 其相关性能指标和效果数据如下表 1所示。
[0060] 表 1 [] [表 i]
Figure imgf000009_0001
[0061] 从表 1中数据可知： 本实施例提供的覆膜工艺能够有效保证 ASA膜的厚度一致 性、 均匀性以及粘合强度， 提高产品使用寿命； 而且更换 ASA颜色吋， 无需清 洗 PVC片材挤出机， 不影响其连续生产性， 节能环保， 可有效降低成本、 提高生 产效率， 其效果显著优于现有技术。
[0062] 以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在本发明的 精神和原则之内所作的任何修改、 等同替换和改进等， 均应包含在本发明的保 护范围之内。
[0063] 以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在本发明的 精神和原则之内所作的任何修改、 等同替换和改进等， 均应包含在本发明的保 护范围之内。

Claims

权利要求书
[权利要求 1] 一种 PVC片材的 ASA覆膜方法， 其特征在于， 包括如下步骤：
获得 AS A膜；
将所述 ASA膜固定在覆膜机架装置上， 通过双滚压覆技术将所述 ASA 膜热压粘覆于从挤塑模头挤出的 PVC片材表面， 得到覆有所述 AS A膜 的 PVC片材的预制品； 其中， 所述 PVC片材温度为 100-250°C;
将覆有所述 ASA膜的 PVC片材的预制品牵引至定型机， 并模压成型。
[权利要求 2] 如权利要求 1所述的 PVC片材的 ASA覆膜方法， 其特征在于， 所述 PV
C片材温度为 200-230°C。
[权利要求 3] 如权利要求 1所述的 PVC片材的 ASA覆膜方法， 其特征在于， 所述 AS
A膜制备过程为： 将 ASA原料通过挤出机挤出、 流延， 双滚定型。
[权利要求 4] 如权利要求 1所述的 PVC片材的 ASA覆膜方法， 其特征在于， 所述 AS
A膜的厚度为： 0.05-3mm。
[权利要求 5] 如权利要求 4所述的 PVC片材的 ASA覆膜方法， 其特征在于， 所述 AS
A膜的厚度为： l-2mm。
[权利要求 6] 如权利要求 1所述的 PVC片材的 ASA覆膜方法， 其特征在于， 所述双 滚压覆技术为光面双滚或花纹双滚。
[权利要求 7] 如权利要求 1所述的 PVC片材的 ASA覆膜方法， 其特征在于， 所述 AS
A膜热压粘覆于所述 PVC片材的一面或双面。
[权利要求 8] 如权利要求 1-7任一项所述的 PVC片材的 ASA覆膜方法， 其特征在于 ， 所述 PVC片材包括： 复合塑料瓦片、 塑钢型材、 木塑、 板材、 片材 中的至少一种。
[权利要求 9] 如权利要求 1-7任一项所述的 PVC片材的 ASA覆膜方法， 其特征在于 ， 所述 ASA膜含有着色剂。
[权利要求 10] 如权利要求 9所述的 PVC片材的 ASA覆膜方法， 其特征在于， 所述着 色剂使所述 ASA膜成红色、 黄色和蓝色中的任意一种。
[权利要求 11] 如权利要求 1-7任一项所述的 PVC片材的 ASA覆膜方法， 其特征在于 ， 所述 PVC片材为复合塑料瓦片， 所述双滚压覆技术为花纹双滚， 所 述花纹双滚的两滚之间间隙比所述复合塑料瓦片的厚度小 0.02mm或 与所述复合塑料瓦片的厚度相等。
[权利要求 12] —种覆有 ASA膜的 PVC片材， 其特征在于， 所述覆有 ASA膜的 PVC片 材由权利要求 1-11任一项所述的 PVC片材的 ASA覆膜方法制得。
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