阅读说明：本技术 一种车身漆面保护用改性聚烯烃弹性体膜及其制备方法 (Modified polyolefin elastomer film for protecting vehicle body paint surface and preparation method thereof ) 是由 易向阳 朱文军 于 2019-11-11 设计创作，主要内容包括：本发明公开了一种车身漆面保护用改性聚烯烃弹性体膜,所述改性聚烯烃弹性体膜为三层结构,第一层为改性聚稀烃弹性体层,第二层为改性自粘胶层,第三层为PET离型膜层,PET离型膜层与改性自粘胶层之间的PET离型膜层表面形成硅油层,用聚烯烃弹性体代替TPU,材料价格只有TPU的1/4,解决了TPU材料贵,同时提高材料的耐黄变性能,延长了产品的使用年限。2、用聚烯烃弹性体代替PVC,克服PVC在严寒季节增塑剂析出,变硬变脆,材料的弹性和韧性下降,保护功能下降。3、用聚烯烃弹性体不含有氯,铅等不环保元素。改性自粘胶层为共挤,非涂布,减少环境污染,同时,解决了涂步法带来的残胶问题。(The invention discloses a modified polyolefin elastomer film for protecting a vehicle body paint surface, which is of a three-layer structure, wherein the first layer is a modified polyolefin elastomer layer, the second layer is a modified self-adhesive layer, the third layer is a PET release film layer, a silicone oil layer is formed on the surface of the PET release film layer between the PET release film layer and the modified self-adhesive layer, the polyolefin elastomer is used for replacing TPU, the material price is only 1/4 of TPU, the problem that the TPU material is expensive is solved, the yellowing resistance of the material is improved, and the service life of the product is prolonged. 2. The polyolefin elastomer is used for replacing PVC, so that the problems that PVC is separated out by a plasticizer in severe cold seasons, becomes hard and brittle, the elasticity and toughness of the material are reduced, and the protection function is reduced are overcome. 3. The polyolefin elastomer does not contain elements such as chlorine, lead and the like which are not environment-friendly. The modified self-adhesive layer is co-extruded and non-coated, so that the environmental pollution is reduced, and meanwhile, the problem of adhesive residue caused by a coating step method is solved.)

1. A modified polyolefin elastomer film for vehicle body finish protection, characterized in that: the modified polyolefin elastomer film is of a three-layer structure, wherein the first layer is a modified polyolefin elastomer layer (1), the second layer is a modified self-adhesive layer (2), the third layer is a PET release film layer (3), a silicone oil layer (4) is formed on the surface of the PET release film layer (3) between the PET release film layer (3) and the modified self-adhesive layer (2), the lower surface of the modified polyolefin elastomer layer (1) is coated with the modified self-adhesive layer (2), the thickness of the modified polyolefin elastomer layer (1) is 0.15mm-0.25mm, the width of the modified polyolefin elastomer layer (1) is 1500-2000mm, the thickness of the modified polyolefin elastomer layer (2) is 0.02mm-0.04mm, the width of the modified self-adhesive layer (2) is 1500mm-2000mm, the thickness of the PET release film layer (3) is 0.02mm-0.04mm, and the thickness of the silicone oil layer (4) is 0.0003mm-0.0004mm, the thickness ratio of the first layer to the second layer to the third layer is 100:15: 15.

2. The modified polyolefin elastomer film for vehicle body finish protection according to claim 1, wherein: the first layer and the second layer are extruded into a double-layer film structure at one time by adopting a two-layer extrusion casting method.

3. A preparation method of a modified polyolefin elastomer film for protecting a vehicle body paint surface is characterized by comprising the following steps: the preparation method is as follows,

the modified polyolefin elastomer consists of polyolefin elastomer POE, metallocene linear polyethylene MLLDPE and scratch-resistant silicone master batch, and is directly extruded by modifying through a double-screw extruder, wherein the polyolefin elastomer POE accounts for 60-70%; the melt flow rate is 4-8g/10min, and the density is 0.87-0.90g/cm 3; 20-30% of metallocene linear polyethylene MLLDPE; the melt flow rate is 2-6g/10min, and the density is 0.92-0.93g/cm 3; the proportion of the scratch-resistant silicone master batch is 2-11%;

the modified self-adhesive consists of linear polyethylene LLDPE, metallocene linear polyethylene MLLDPE and Polyisobutylene (PIB) master batches, and is directly extruded by modification by a double-screw extruder, wherein the linear polyethylene LLDPE accounts for 60-75%; the melt flow rate is 2-6g/10min, and the density is 0.92-0.93g/cm 3; 20-30% of metallocene linear polyethylene MLLDPE; the melt flow rate is 2-6g/10min, and the density is 0.92-0.93g/cm 3; polyisobutylene (PIB) master batch accounts for 4-11 percent,

the modified polyolefin elastomer and the modified self-adhesive are directly extruded by the modification of a double-screw extruder, and form a double-layer structure after passing through a double-layer T-shaped die head, the first layer is a modified polyolefin elastomer layer (1), the second layer is a modified self-adhesive layer (2), an unwinding roller device provided with a PET release film is arranged above the double-layer T-shaped die head of the extruder, the linear speed of the unwinding roller device is synchronous with that of an extrusion host, and after the first layer and the second layer are cooled, the PET release film with silicone oil is compounded on the second layer and wound together.

Technical Field

The invention relates to the technical field of films for protecting vehicle body paint surfaces, in particular to a modified polyolefin elastomer film for protecting vehicle body paint surfaces, and particularly relates to a composite layer film structure and a preparation method thereof.

Background

The protective film for the paint surface of the vehicle body has the functions of covering the vehicle body by using the high-performance transparent environment-friendly film, providing all-around protection for vehicle paint, improving the corrosion resistance, oxidation resistance and scratch resistance of the paint surface, not only preventing the color of the original paint from being covered, but also improving the overall glossiness of the vehicle body,

the existing protective film for the paint surface of the automobile body is based on two materials, namely soft polyvinyl chloride (PVC) and thermoplastic polyurethane elastomer (TPU), the protective film made of the former material has poor toughness, plasticizer is separated out in cold seasons, the material is hardened, and the cost is slightly low due to low inelastic coating treatment.

The TPU protective film is softer in texture, has good toughness and stretchability, protects the vehicle paint by means of high-strength toughness, and has certain scratch automatic repair capability and higher price. However, the TPU has the defects of poor aging resistance, long-time exposure and easy yellowing.

The invention aims to provide a modified polyolefin elastomer film for protecting a vehicle body paint surface, and compared with a PVC (polyvinyl chloride) material, the modified polyolefin elastomer film has better performances on the opposite sides of softness, ductility and toughness. Compared with TPU materials, the material has better yellowing resistance and lower price. Overcomes the defects in the prior art.

In order to achieve the purpose, the technical scheme of the invention is as follows: a modified polyolefin elastomer film for protecting a vehicle body paint surface is of a three-layer structure, wherein the first layer is a modified polyolefin elastomer layer, the second layer is a modified self-adhesive layer, the third layer is a PET release film layer, a silicone oil layer is formed on the surface of the PET release film layer between the PET release film layer and the modified self-adhesive layer, the lower surface of the modified polyolefin elastomer layer is coated with the modified self-adhesive layer, the thickness of the modified polyolefin elastomer layer is 0.15-0.25 mm, the width of the modified polyolefin elastomer layer is 1500-2000mm, the thickness of the modified polyolefin elastomer layer is 0.02-0.04 mm, the width of the modified polyolefin elastomer layer is 1500-2000mm, the thickness of the PET release film layer is 0.02-0.04 mm, the thickness of the silicone oil layer is 0.0003-0.0004 mm, and the thickness ratio of the first layer to the second layer to the third layer is 100:15: 15.

A preparation method of a modified polyolefin elastomer film for protecting a vehicle body paint surface comprises the following steps:

the modified polyolefin elastomer consists of polyolefin elastomer POE, metallocene linear polyethylene MLLDPE and scratch-resistant silicone master batch, and is directly extruded by modifying through a double-screw extruder, wherein the polyolefin elastomer POE accounts for 60-70%; the melt flow rate is 4-8g/10min, and the density is 0.87-0.90g/cm 3; 20-30% of metallocene linear polyethylene MLLDPE; the melt flow rate is 2-6g/10min, and the density is 0.92-0.93g/cm 3; the proportion of the scratch-resistant silicone master batch is 2-11%;

the modified self-adhesive consists of linear polyethylene LLDPE, metallocene linear polyethylene MLLDPE and Polyisobutylene (PIB) master batches, and is directly extruded by modification by a double-screw extruder, wherein the linear polyethylene LLDPE accounts for 60-75%; the melt flow rate is 2-6g/10min, and the density is 0.92-0.93g/cm 3; 20-30% of metallocene linear polyethylene MLLDPE; the melt flow rate is 2-6g/10min, and the density is 0.92-0.93g/cm 3; polyisobutylene (PIB) master batch accounts for 4-11 percent,

the modified polyolefin elastomer and the modified self-adhesive are directly extruded by a double-screw extruder in a modified way, and then form a double-layer structure after passing through a double-layer T-shaped die head, the first layer is a modified polyolefin elastomer layer, the second layer is a modified self-adhesive layer, a unreeling roller device provided with a PET release film is arranged above the double-layer T-shaped die head of the extruder, the unreeling roller device is synchronous with the linear speed of an extrusion host, and after the first layer and the second layer are cooled, the PET release film with silicone oil is compounded on the second layer and is reeled together.

The invention discloses a modified polyolefin elastomer film for protecting a vehicle body paint surface, which has the technical effects that: 1. the polyolefin elastomer is used for replacing TPU, the price of the material is only 1/4 of TPU, the problem that the TPU material is expensive is solved, the yellowing resistance of the material is improved, and the service life of the product is prolonged. 2. The polyolefin elastomer is used for replacing PVC, so that the problems that PVC is separated out by a plasticizer in severe cold seasons, becomes hard and brittle, the elasticity and toughness of the material are reduced, and the protection function is reduced are overcome. 3. The polyolefin elastomer does not contain elements such as chlorine, lead and the like which are not environment-friendly. The modified self-adhesive layer is co-extruded and non-coated, so that the environmental pollution is reduced, and meanwhile, the problem of adhesive residue caused by a coating step method is solved.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

Detailed Description

The invention will be further described with reference to the accompanying drawings.

The invention discloses a modified polyolefin elastomer film for protecting a vehicle body paint surface, which is different from the prior art in that: the modified polyolefin elastomer membrane is of a three-layer structure, wherein the first layer is a modified polyolefin elastomer layer 1, the second layer is a modified self-adhesive layer 2, the third layer is a PET release film layer 3, a silicone oil layer 4 is formed on the surface of the PET release film layer 3 between the PET release film layer 3 and the modified self-adhesive layer 2, the lower surface of the modified polyolefin elastomer layer 1 is coated with the modified self-adhesive layer 2, the thickness of the modified polyolefin elastomer layer 1 is 0.15-0.25 mm, the width of the modified polyolefin elastomer layer 1 is 1500-2000mm, the thickness of the silicone oil layer 4 is 0.0003-0.0004 mm, and the thickness ratio of the first layer to the second layer to the third layer is 100:15: 15.

The invention discloses a preparation method of a modified polyolefin elastomer film for protecting a vehicle body paint surface, which comprises the following steps of preparing a modified polyolefin elastomer, namely a modified polyolefin elastomer, from a polyolefin elastomer POE (polyolefin elastomer), metallocene linear polyethylene MLLDPE (metallocene linear polyethylene) and an anti-scratch silicone master batch, and directly extruding the modified polyolefin elastomer by modifying the modified polyolefin elastomer through a double-screw extruder, wherein the polyolefin elastomer POE accounts for 60-70 percent of the total weight of the modified polyolefin elastomer; the melt flow rate is 4-8g/10min, 2.16kg, and the density is 0.87-0.90g/cm 3; 20-30% of metallocene linear polyethylene MLLDPE; the melt flow rate is 2-6g/10min, 2.16kg, and the density is 0.92-0.93g/cm 3; the proportion of the scratch-resistant silicone master batch is 2-11%;

the modified self-adhesive consists of linear polyethylene LLDPE, metallocene linear polyethylene MLLDPE and Polyisobutylene (PIB) master batches, and is directly extruded by modification by a double-screw extruder, wherein the linear polyethylene LLDPE accounts for 60-75%; the melt flow rate is 2-6g/10min, 2.16kg, and the density is 0.92-0.93g/cm 3; 20-30% of metallocene linear polyethylene MLLDPE; the melt flow rate is 2-6g/10min, 2.16kg, and the density is 0.92-0.93g/cm 3; polyisobutylene (PIB) master batch accounts for 4-11 percent,

the modified polyolefin elastomer and the modified self-adhesive are directly extruded by a double-screw extruder in a modified way, and then form a double-layer structure after passing through a double-layer T-shaped die head, the first layer is a modified polyolefin elastomer layer, the second layer is a modified self-adhesive layer, a unreeling roller device provided with a PET release film is arranged above the double-layer T-shaped die head of the extruder, the unreeling roller device is synchronous with the linear speed of an extrusion host, and after the first layer and the second layer are cooled, the PET release film with silicone oil is compounded on the second layer and is reeled together.

When the modified polyolefin elastomer is specifically implemented, the modified polyolefin elastomer layer is a saturated molecular chain without double bonds of the molecular chain, and the ultraviolet-resistant and heat-aging-resistant auxiliary agent is added, so that the modified polyolefin elastomer is not easy to oxidize, has strong ultraviolet-resistant capability, is not yellow when exposed to the sun, and has the service life of 6-7 years. The special ethylene and propylene block copolymer has high resilience, high cohesive energy and high strength.

In specific implementation, the modified self-adhesive overcomes the problem of residual adhesive peeling after the coating method is used for gluing. No residual glue is left on the car body after stripping.

The first layer and the second layer are extruded into a double-layer film structure at one time by adopting a two-layer extrusion casting method. The first layer is a modified polyolefin elastomer layer 1, and the second layer is a modified self-adhesive layer, so that the problem of residual adhesive peeling after the coating method is used for gluing is solved. And no residual glue is left on the vehicle body after stripping. In the specific implementation, a one-step method of modification molding is adopted, namely a double-screw extruder is used for directly modifying and extruding, and the step of modification granulation is omitted. The double-screw modification extrusion molding is carried out in one step, so that the energy consumption is saved, the crystal points are reduced, and the heat drop of the material is avoided.

In specific implementation, the PET release film layer is extruded on the first layer and the second layer and then directly covered on the second layer.

In particular, the screw diameter of the parallel twin-screw extruder is

The aspect ratio is 40: 1.

The first layer of the modified polyolefin elastomer film for protecting the paint surface of the vehicle body provides elasticity, toughness, transparency, scratch resistance, acid and alkali resistance and yellowing resistance for the modified polyolefin elastomer layer, and protects the vehicle paint; the second layer is a modified self-adhesive layer, so that the bonding effect of the vehicle paint protective ink and the vehicle body is ensured, and no residual glue is generated because the vehicle paint protective ink is directly extruded and is not a coating process; the third layer is a PET release film layer, and the release film is used for isolation due to the self-adhesive layer. The film can be separated, and the release film is torn off during construction and decoration. The first layer and the second layer are subjected to a modified extrusion one-step method, so that energy is saved, material loss is reduced, and heat aging loss of a material subjected to secondary heating is reduced. The self-adhesive layer is co-extruded and non-coated, so that the environmental pollution is reduced, and meanwhile, the problem of adhesive residue caused by a coating step method is solved.

First layer of modified polyolefin elastomer, and process parameters of double-screw extruder

Second layer modified polyolefin elastomer, and double screw extruder technological parameters

Comparison of TPU, PVC, TPO (modified polyolefin) vehicle membranes

Item	TPU	PVC	TPO
				Tensile strength ISO527-3MPa	≤60	≤30	≤30
Service life of the product	2-3	5-7	5-7
				Anti-yellowing property	Difference (D)	Good taste	Good taste
Scratch resistance	Good taste	In general	In general
				Environment-friendly	Environment-friendly	Is not environment-friendly	Environment-friendly
Price	Height of	Is low in	Is low in

The foregoing is a more detailed description of the present invention in connection with specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific details set forth herein. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.