阅读说明：本技术 一种防水卷材用增韧型聚酯胎体膜及其制备方法 (Toughening type polyester matrix film for waterproof coiled material and preparation method thereof ) 是由 张启纲 苏醒 李沅鸿 王果连 李国庆 郑明伟 王飞龙 于 2019-03-08 设计创作，主要内容包括：本发明涉及一种防水卷材用增韧型聚酯胎体膜及其制备方法,属于薄膜生产制造技术领域。该薄膜由上表层、芯层和下表层组成；上表层由PET和含SiO<Sub>2</Sub>抗粘结剂的PET母料组成,芯层由PET、SEBS热塑性弹性体、PE-g-MAH组成,下表层由PET组成。制备方法是将原料按照各层的配方混合后,分别经三套挤出系统熔融、抽真空、过滤后挤出,三种熔体汇合至T型模头后挤出铸片,再经双向拉伸定型、牵引收卷、分切即可得防水卷材用胎体膜。本发明增韧型聚酯胎体膜强度高、刚性好,耐高温,尺寸稳定性好,而且具有良好的韧性和较高的延伸率,克服了PET防水卷材脆性大、易开裂、不易收卷等缺陷。(The invention relates to a toughening type polyester matrix film for a waterproof coiled material and a preparation method thereof, belonging to the technical field of film production and manufacturing. The film consists of an upper surface layer, a core layer and a lower surface layer; the upper surface layer is made of PET and SiO 2 Anti-adhesive PEThe core layer consists of PET, SEBS thermoplastic elastomer and PE-g-MAH, and the lower surface layer consists of PET. The preparation method comprises the steps of mixing the raw materials according to the formula of each layer, respectively melting by three sets of extrusion systems, vacuumizing, filtering, extruding, converging the three melts to a T-shaped die head, extruding a cast sheet, and performing two-way stretching shaping, traction rolling and slitting to obtain the matrix film for the waterproof coiled material. The toughened polyester matrix film has the advantages of high strength, good rigidity, high temperature resistance, good dimensional stability, good toughness and higher elongation, and overcomes the defects of large brittleness, easy cracking, difficult rolling and the like of a PET waterproof coiled material.)

1. A toughening type polyester matrix film for a waterproof coiled material is characterized in that: the film consists of an upper surface layer, a core layer and a lower surface layer; the upper surface layer is made of PET and SiO-containing₂The anti-adhesive PET master batch comprises a core layer, a lower surface layer and an anti-adhesive layer, wherein the core layer comprises PET, SEBS thermoplastic elastomer and PE-g-MAH, and the lower surface layer comprises PET.

2. The toughening type polyester matrix film for a waterproof roll according to claim 1, characterized in that: according to the weight percentage, in the upper surface layer, the content of PET is 80% -85%, and the content of PET master batch is 15-20%; in the core layer, the content of PET is 70% -80%, the content of PE-g-MAH is 10-20%, and the content of SEBS is 5-10%.

3. The toughening type polyester matrix film for a waterproof roll according to claim 1, characterized in that: in the matrix film, the thickness of the upper surface layer accounts for 10-20% of the total thickness of the film, the thickness of the core layer accounts for 60-80% of the total thickness of the film, and the thickness of the lower surface layer accounts for 10-20% of the total thickness of the film.

4. The toughening type polyester matrix film for a waterproof roll according to claim 3, characterized in that: the total thickness of the matrix film is 40-200 mu m.

5. The method for preparing the toughening type polyester matrix film for the waterproof roll according to any one of claims 1 to 4, comprising the steps of:

(1) uniformly mixing the components according to the composition formula of the core layer in proportion, melting and vacuumizing the mixture in a main extruder, and filtering to remove water and impurities in the raw materials to obtain a main extrusion melt serving as the core layer;

(2) uniformly mixing the components according to the composition formula of the upper surface layer and the lower surface layer in proportion, and carrying out melting and vacuumizing treatment by respective corresponding auxiliary extruders to obtain auxiliary extrusion melt serving as the upper surface layer and the lower surface layer;

(3) converging and extruding the main extrusion melt and the auxiliary extrusion melts on the upper and lower surface layers in a three-layer die head, and closely attaching the extruded mixed melt to the surface of a grounded cold drum after passing through an electrostatic adsorption wire to form a cast sheet;

(4) stripping the cast sheet from the cold drum to form a sheet, preheating the sheet, then entering a longitudinal stretching area, and completing longitudinal stretching through double-point stretching; the longitudinally stretched sheet directly enters a transverse stretching area after being preheated, transverse stretching is completed through multi-stage stretching, then the longitudinally and transversely stretched film is subjected to heat setting treatment, and finally cooling is performed;

(5) and (2) cooling the film, then feeding the film into a traction device, flattening the stretched film by using the device, detecting the longitudinal and transverse thicknesses of the film by using a film thickness meter, then cutting off two waste edges, then feeding the film to a winding machine for winding, and finally slitting to obtain the matrix film for the waterproof coiled material.

6. The method for preparing the toughening type polyester matrix film for the waterproof roll according to claim 5, characterized in that: the extrusion temperature of the main extrusion melt and the auxiliary extrusion melt is 255-275 ℃, and the water content of the main extrusion melt and the auxiliary extrusion melt is less than or equal to 50ppm after the main extrusion melt and the auxiliary extrusion melt are subjected to vacuum-pumping treatment and filter filtration.

7. The method for preparing the toughening type polyester matrix film for the waterproof roll according to claim 5, characterized in that: the melts of the upper surface layer, the core layer and the lower surface layer respectively correspond to three sets of extrusion systems, the three melts are converged to a die head to realize three-layer co-extrusion, and the die head is an ABC three-flow-channel T-shaped die head.

8. The method for preparing the toughening type polyester matrix film for the waterproof roll according to claim 7, characterized in that: the temperature of the die head is 270-275 ℃, and the temperature of the cold drum is 25-35 ℃.

9. The method for preparing the toughening type polyester matrix film for the waterproof roll according to claim 5, characterized in that: the preheating temperature of longitudinal stretching is 70-80 ℃, the temperature of a slow stretching roller is 80-85 ℃, the temperature of a fast stretching roller is 35-40 ℃, and the stretching multiple is 1.5-3.5 times; the preheating temperature of the transverse stretching is 85-105 ℃, the stretching temperature is 105-110 ℃, and the stretching multiple is 1.5-3.5 times; the temperature of the heat setting treatment is 180-220 ℃.

Technical Field

The invention relates to a toughening type polyester matrix film for a waterproof coiled material and a preparation method thereof, belonging to the technical field of film production and manufacturing.

Background

With the rapid development of national economy in China, not only industrial buildings and civil buildings have requirements on various high-quality waterproof materials, but also the requirements on the waterproof materials in the fields of bridges, tunnels, national defense and military industry, agricultural water conservancy, transportation and the like are further improved, and the domestic waterproof market demand is quite large. Waterproof materials are generally classified into 5 categories, namely, high polymer modified asphalt-based waterproof rolls, synthetic polymer waterproof rolls, waterproof coatings, sealing materials, rigid waterproof and plugging materials. The waterproof roll is mainly applied to the building waterproof material in China, and accounts for about 60% of the waterproof material.

At present, the self-adhesive waterproof coiled material which is most widely used in the market is the SBS modified asphalt waterproof coiled material, and a used matrix film mainly comprises an HDPE (high-density polyethylene) crossed alloy film and a PET (polyethylene terephthalate) film, the thickness is generally 0.04-0.2 mm, and the width is 980-1000 mm. The HDPE crossed alloy film has excellent tearing strength and puncture resistance, but is not high-temperature resistant, and is easy to scald when being contacted with high-temperature asphalt mastic with the temperature of more than 130 ℃, so that the product quality of the waterproof coiled material is limited; the PET film has high mechanical strength and good high temperature resistance, but the elongation is only about 30-120 percent, the requirement of deformation and cracking resistance of the waterproof coiled material cannot be met, the toughness of the PET film is poor, the produced coiled material is harder, and the tearing property of an opening is poor.

Disclosure of Invention

The invention aims to provide a toughening type polyester matrix film for a waterproof coiled material and a preparation method thereof, which are used for preparing the waterproof coiled material so as to meet the development requirement of the building waterproof industry.

Aiming at the problems in the prior art, the invention develops the polyester body film with high temperature resistance, high toughness and high strength, and the PET is added with a proper amount of SEBS thermoplastic elastomer (hydrogenated styrene-butadiene block copolymer) and PE (polyethylene), so that the toughness and the elongation are increased while the high strength and high temperature resistance of the PET film are maintained, and the requirement of a novel waterproof market is met.

The purpose of the invention is realized by the following technical scheme:

a toughening type polyester body film for a waterproof coiled material comprises an upper surface layer, a core layer and a lower surface layer; the core layer is composed of PET, SEBS (hydrogenated styrene-butadiene block copolymer) thermoplastic elastomer and PE-g-MAH (maleic anhydride grafted polyethylene, namely polyethylene grafted with maleic anhydride compatilizer), and the lower surface layer is composed of PET.

Further, in the upper surface layer, the content of PET is 80-85% and the content of PET masterbatch is 15-20% in percentage by weight.

Furthermore, in the core layer, the content of PET is 70-80 wt%, the content of PE-g-MAH is 10-20 wt%, and the content of SEBS is 5-10 wt%.

Further, the content of PET in the lower skin layer was 100%.

Further, the PET master batch chip preferably contains Silica (SiO)₂) The anti-blocking masterbatch of (1). In the upper surface layer, silicon dioxide (SiO)₂) The addition weight of (A) is 0.1-1%.

Furthermore, the total thickness of the matrix film is 40-200 mu m, the thickness of the upper surface layer accounts for 10-20% of the total thickness of the film, the thickness of the core layer accounts for 60-80% of the total thickness of the film, and the thickness of the lower surface layer accounts for 10-20% of the total thickness of the film.

In the method, the PET, PET master batch and PETG raw materials are respectively PET slices, PET master batch slices and PETG slices.

The performance test indexes of the toughened polyester matrix film for the waterproof coiled material are shown in the table 1.

TABLE 1 Properties of toughened polyester carcass films according to the invention

Test items	Test value	Test standard
			Thickness (μm)	40～200	GB/T 6672-2001
Transverse tensile Strength (MPa)	≧200	GB/T 1040.3-2006
			Longitudinal tensile Strength (MPa)	≧200	GB/T 1040.3-2006
Transverse elongation (%)	≧180	GB/T 1040.3-2006
			Longitudinal elongation (%)	≧180	GB/T 1040.3-2006
Transverse shrinkage (%)	≦3	GB/T 16958-2008
			Longitudinal shrinkage (%)	≦3	GB/T 16958-2008
Tear Strength (N)	≧25	GB/T 23457-2017

The invention also provides a method for preparing the matrix film for the waterproof coiled material, which comprises the steps of uniformly mixing the raw materials according to the formula, and carrying out melt plasticizing, sheet casting, biaxial stretching, traction rolling and slitting on the raw materials by an extruder to obtain the toughened polyester matrix film for the waterproof coiled material.

A preparation method of a toughening type polyester matrix film for a waterproof coiled material comprises the following steps:

(1) uniformly mixing the components according to the composition formula of the core layer in proportion, melting and vacuumizing the mixture in a main extruder, and filtering to remove water and impurities in the raw materials to obtain a main extrusion melt serving as the core layer;

(2) uniformly mixing the components according to the composition formula of the upper surface layer and the lower surface layer in proportion, and carrying out melting and vacuumizing treatment by respective corresponding auxiliary extruders to obtain auxiliary extrusion melt serving as the upper surface layer and the lower surface layer;

(3) converging and extruding the main extrusion melt and the auxiliary extrusion melts on the upper and lower surface layers in a three-layer die head, and closely attaching the extruded mixed melt to the surface of a grounded cold drum after passing through an electrostatic adsorption wire to form a cast sheet;

(4) stripping the cast sheet from the cold drum to form a sheet, preheating the sheet, then entering a longitudinal stretching area, and completing longitudinal stretching through double-point stretching; the longitudinally stretched sheet directly enters a transverse stretching area after being preheated, transverse stretching is completed through multi-stage stretching, then the longitudinally and transversely stretched film is subjected to heat setting treatment, and finally cooling is performed;

(5) and (2) cooling the film, then feeding the film into a traction device, flattening the stretched film, detecting the longitudinal and transverse thicknesses of the film by using a film thickness meter, cutting off two waste edges, conveying the film to a winding machine at a constant speed for winding, and finally slitting to obtain the matrix film for the waterproof coiled material.

In the steps (1) and (2), the extrusion temperature of the main extrusion melt and the auxiliary extrusion melt is 255-275 ℃, and after the main extrusion melt and the auxiliary extrusion melt are subjected to vacuum-pumping treatment and filter, the water content is less than or equal to 50 ppm.

In the step (3), the melts of the upper surface layer, the core layer and the lower surface layer respectively correspond to three sets of extrusion systems, three melts are converged to a die head to realize three-layer co-extrusion, and the die head is an ABC three-flow-channel T-shaped die head. The die head temperature is 270-275 ℃, and the cold drum temperature is 25-35 ℃.

In the step (4), the preheating temperature of longitudinal stretching is 70-80 ℃, the temperature of a slow stretching roller is 80-85 ℃, the temperature of a fast stretching roller is 35-40 ℃, and the stretching multiple is 1.5-3.5 times. The preheating temperature of transverse stretching is 85-105 ℃, the stretching temperature is 105-110 ℃, and the stretching multiple is 1.5-3.5 times. The temperature of the heat setting treatment is 180-220 ℃.

In the step (5), the thickness of the matrix film for the waterproof roll is 40-200 μm.

In the method, the PET used in the film core layer can be added with a certain proportion of reclaimed materials, and the reclaimed materials are waste sheets, waste films and trimming materials generated in the process of preparing the biaxially oriented PET film, so that the production cost can be greatly reduced.

The PETG chips, PET chips and master batch chips used in the above methods are commercially available products or products produced by the company (publicly available products), and the PE-g-MAH and SEBS thermoplastic elastomers are commercially available products.

Compared with the prior art, the invention has the beneficial effects that: (1) by adding the SEBS elastomer and the PE into the film core layer, the toughness and the recovery capability of the PET film are improved while the high strength and the high temperature resistance of the PET film are maintained, the elongation at break can reach more than 180%, and the requirement of deformation and cracking resistance of the waterproof coiled material is met; (2) the compatilizer is introduced by adding the PE-g-MAH, so that the dispersion of the compatilizer is facilitated, and the compatibility between PE and PET is increased; (3) by adjusting the stretching temperature, the stretching ratio and the heat setting temperature, the mechanical property and the thickness uniformity of the film are improved, and the heat-resistant temperature of the film can reach over 160 ℃.

Practice proves that the waterproof coiled material prepared by the toughened polyester carcass film has excellent tensile strength and elongation, good thermal stability and tear resistance, excellent corrosion resistance and aging resistance, and excellent waterproof effect, can be constructed on a wet base surface, has low requirement on the base layer, and reaches the domestic advanced level.

Detailed Description

The polyester body film consists of an upper surface layer, a core layer and a lower surface layer, wherein the upper surface layer consists of PET slices and SiO-containing SiO₂The anti-adhesive PET master batch is prepared by PET slices, SEBS thermoplastic elastomer and PE-g-MAH (polyethylene grafted with maleic anhydride compatilizer), and the lower surface layer is prepared by PET slices. The preparation method comprises the steps of mixing the raw materials according to the formula of each layer, respectively melting by three sets of extrusion systems, vacuumizing, filtering and extruding, converging the three melts to a T-shaped die head, extruding a cast sheet, wherein the die head is an ABC three-flow-channel T-shaped die head, and performing bidirectional stretching shaping, traction rolling and slitting on the cast sheet to obtain the matrix film for the waterproof coiled material.