WO2020177476A1 - 一种pvc芯表层热转印户外地板的制备工艺 - Google Patents

一种pvc芯表层热转印户外地板的制备工艺 Download PDF

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WO2020177476A1
WO2020177476A1 PCT/CN2020/070389 CN2020070389W WO2020177476A1 WO 2020177476 A1 WO2020177476 A1 WO 2020177476A1 CN 2020070389 W CN2020070389 W CN 2020070389W WO 2020177476 A1 WO2020177476 A1 WO 2020177476A1
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pvc
thermal transfer
preparation process
surface layer
glue
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PCT/CN2020/070389
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English (en)
French (fr)
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唐圣卫
唐道远
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安徽森泰木塑集团股份有限公司
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Publication of WO2020177476A1 publication Critical patent/WO2020177476A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D99/00—Subject matter not provided for in other groups of this subclass
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00—Flooring
    • E04F15/02—Flooring or floor layers composed of a number of similar elements

Definitions

  • the invention relates to the technical field of PVC flooring, in particular to a preparation process of a thermal transfer outdoor floor with a PVC core surface layer.
  • PVC foam board is generally made of surface layer and foam core layer.
  • the specific process flow is extrusion and discharging, moulding into embryo, cooling and shaping, pulling and discharging.
  • the material of PVC foam board is relatively light and can be sawed. , Can be nailed, more suitable for outdoor floor paving, but its mechanical strength is often insufficient, the surface is easily scratched, and the wear resistance is poor.
  • the texture and tone of PVC foam board are relatively simple, which cannot meet the needs of customers.
  • the technical problem to be solved by the present invention is to provide a preparation process for thermal transfer of PVC core surface layer outdoor flooring.
  • the present invention applies thermal transfer technology to the preparation of PVC flooring, so that PVC flooring has many texture effects, mechanical strength and wear resistance. Performance has been significantly improved.
  • a preparation process of thermal transfer outdoor flooring with PVC core surface layer including the following steps:
  • Preparation of PVC foam core layer send the PVC material with foaming agent into the extruder to heat and foam and then extrude; then send the viscous foamed PVC extruded material into the mold to set the thickness. A strip slab is formed; finally, the strip slab traveling slowly is cooled and shaped in the shaping device;
  • the heating and foaming temperature of the PVC material during extrusion and discharging is 160-190°C; the cooling and shaping temperature of the slab in the cooling and shaping is 20-40°C.
  • the working conditions of the transfer machine in the step (2) temperature is 140-180°C, roller speed is 4-7m/min, pressure is 2-3MP.
  • the preparation method of the modified glue is: adding polyvinyl alcohol and non-ionic surfactant to deionized water, heating to reflux state and holding and stirring for 10-30 minutes, adding hydroxymethyl cellulose, chain initiator, resistance under nitrogen atmosphere The polymerizer continues to be refluxed and stirred for 1-3 hours. After the reaction, the obtained graft product is filtered, washed with water, and dried to obtain a hydroxymethyl cellulose graft-modified polyvinyl alcohol, that is, modified glue.
  • the mass ratio of the polyvinyl alcohol, nonionic surfactant, deionized water, hydroxymethyl cellulose, chain initiator and polymerization inhibitor is 85-100:0.5-1:300-500:20-30:0.5 -2: 2-5.
  • the grafting rate of the hydroxymethyl cellulose grafted modified polyvinyl alcohol is 13-17%.
  • the molecular weight of the polyvinyl alcohol is 110,000-130,000, and the viscosity is 21-33.
  • the hydroxymethyl cellulose has a methoxy value of 20%-23%, a hydroxypropyl value of 5%-8%, and a molecular weight of 10,000-50,000.
  • the non-ionic surfactant is selected from one of polysorbate 20, sorbitan stearate 20 and alkylphenol polyoxyethylene ether OP-10.
  • the chain initiator is selected from one of azobisisobutyronitrile, diacyl peroxide, and sodium persulfate.
  • the polymerization inhibitor is selected from one of N,N-dimethylformamide, N,N-dimethylacetamide, and dimethylsulfoxide.
  • the preparation method of the coating liquid is as follows: ultrasonically disperse graphene, nano titanium dioxide, and silicon dioxide in deionized water, then add sodium alginate and glycerol, heat up to 65°C and keep stirring for 0.5-1.5h, then .
  • the mass ratio of the graphene, nano titanium dioxide, silicon dioxide, sodium alginate, glycerol, and deionized water is 5-8:3-5:6-10:0.5-2:4-8:200-400 .
  • the coating liquid can form an alloyed layer structure on the surface of the floor, thereby significantly improving the mechanical strength and wear resistance of the PVC floor, and the addition of graphene can significantly improve the weather resistance of the PVC floor.
  • hydroxymethyl cellulose is used for graft modification of polyvinyl alcohol, and the grafting rate is controlled to be 13-17% under a specific strip.
  • the grafting rate of polyvinyl alcohol is compared with traditional glue Better affinity and peel strength.
  • the modified polyvinyl alcohol has a strong protective effect on the image and texture after thermal transfer, and it can also improve the mechanical strength and wear resistance of the PVC floor;
  • the PVC floor of the present invention includes surface material, glue, heat transfer, and core material PVC.
  • the required raw materials are simple and easy to buy, and the production efficiency is high.
  • the printer can print multiple pieces at the same time, and each piece of texture can be different.
  • the production speed It can reach 5 meters/min.
  • Preparation of PVC foam core layer send the PVC material with foaming agent into the extruder to heat and foam and then extrude; then send the viscous foamed PVC extruded material into the mold to set the thickness.
  • the strip-shaped slab is formed; finally, the slowly-moving strip-shaped slab is cooled and shaped in the shaping device; the heating and foaming temperature is 170°C, and the cooling and shaping temperature is 25°C;
  • modified glue add 95 parts of polyvinyl alcohol and 0.5 parts of polysorbate 20 to 400 parts of deionized water, heat to reflux and keep stirring for 20 minutes, add 22 parts of hydroxymethyl cellulose, 0.8 parts under nitrogen atmosphere 1 part of sodium persulfate and 2 parts of N,N-dimethylformamide continue to reflux and stir for 1.5h. After the reaction, the obtained graft product is filtered, washed with water, and dried to obtain a hydroxymethyl cellulose graft-modified poly Vinyl alcohol, the modified glue, has a grafting rate of 13-17%.
  • coating liquid Disperse 6 parts of graphene, 3 parts of nano titanium dioxide, 7 parts of silicon dioxide in 200 parts of deionized water ultrasonically, then add 0.6 parts of sodium alginate and 5 parts of glycerol, and heat to 65°C for heat preservation Stir for 1 hour, and then.
  • Preparation of PVC foam core layer send the PVC material with foaming agent into the extruder to heat and foam and then extrude; then send the viscous foamed PVC extruded material into the mold to set the thickness.
  • the strip-shaped slab is formed; finally, the slowly-moving strip-shaped slab is cooled and shaped in the shaping device; the heating and foaming temperature is 180°C, and the cooling and shaping temperature is 35°C;
  • modified glue add 98 parts of polyvinyl alcohol and 0.6 parts of sorbitan stearate 20 to 420 parts of deionized water, heat to reflux and keep stirring for 25 minutes, and add 25 parts of methylol fiber under nitrogen atmosphere 1.0 part of azobisisobutyronitrile and 2.5 parts of dimethyl sulfoxide continue to stir under reflux for 2.5 hours. After the reaction, the grafted product obtained is filtered, washed with water and dried to obtain the grafted modification of hydroxymethyl cellulose. Polyvinyl alcohol, the modified glue, has a grafting rate of 13-17%.
  • coating liquid Disperse 6 parts of graphene, 3 parts of nano titanium dioxide, 7 parts of silicon dioxide in 200 parts of deionized water ultrasonically, then add 0.6 parts of sodium alginate and 5 parts of glycerol, and heat to 65°C for heat preservation Stir for 1 hour, and then.
  • Preparation of PVC foam core layer send the PVC material with foaming agent into the extruder to heat and foam and then extrude; then send the viscous foamed PVC extruded material into the mold to set the thickness.
  • the strip-shaped slab is formed; finally, the slowly-moving strip-shaped slab is cooled and shaped in the shaping device; the heating and foaming temperature is 170°C, and the cooling and shaping temperature is 25°C;
  • modified glue add 95 parts of polyvinyl alcohol and 0.5 parts of polysorbate 20 to 400 parts of deionized water, heat to reflux and keep stirring for 20 minutes, add 22 parts of hydroxymethyl cellulose, 0.8 parts under nitrogen atmosphere Part of sodium persulfate, continue to reflux and stir for 1.5 hours, after the reaction, the obtained graft product is filtered, washed with water, and dried to obtain hydroxymethyl cellulose grafted modified polyvinyl alcohol, that is, modified glue.
  • coating liquid Disperse 6 parts of graphene, 3 parts of nano titanium dioxide, 7 parts of silicon dioxide in 200 parts of deionized water ultrasonically, then add 0.6 parts of sodium alginate and 5 parts of glycerol, and heat to 65°C for heat preservation Stir for 1 hour, and then.
  • Preparation of PVC foam core layer send the PVC material with foaming agent into the extruder to heat and foam and then extrude; then send the viscous foamed PVC extruded material into the mold to set the thickness.
  • the strip-shaped slab is formed; finally, the slowly-moving strip-shaped slab is cooled and shaped in the shaping device; the heating and foaming temperature is 170°C, and the cooling and shaping temperature is 25°C;
  • Glue Polyvinyl alcohol.
  • coating solution ultrasonically disperse 6 parts of graphene, 3 parts of nano titanium dioxide, and 7 parts of silicon dioxide in 200 parts of deionized water, then add 0.6 parts of sodium alginate and 5 parts of glycerol, and heat to 65°C for heat preservation Stir for 1 hour, and then.
  • Example 1-2 and Comparative Example 1-2 were used to prepare outdoor floors, and their performance was measured. The results are shown in Table 1.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Printing Methods (AREA)

Abstract

一种PVC芯表层热转印户外地板的制备工艺，包括PVC发泡芯层的制备、热转印、涂胶、覆膜、包装入库，该PVC地板包括表层材料、胶水、热转印、芯层材料PVC，所需原材料简单易购，生产效率高，打印机可同时打印多块，每块纹理都可以不一样，生产速度可达到5米/min。

Description

一种PVC芯表层热转印户外地板的制备工艺 技术领域：
本发明涉及PVC地板技术领域，具体涉及一种PVC芯表层热转印户外地板的制备工艺。
背景技术：
PVC发泡板一般由表层和发泡芯层复合制成，其具体的工艺流程为挤塑出料、入模成胚、降温定型、牵引出料，PVC发泡板的材质比较轻，可锯、可钉，比较适合户外地板铺装，但其机械强度往往不够，表面易划伤，耐磨性能较差。同时PVC发泡板的纹理和色调比较单一，无法满足客户的需求。
发明内容：
本发明所要解决的技术问题在于提供一种PVC芯表层热转印户外地板的制备工艺，本发明将热转印技术应用到PVC地板的制备中，使得PVC地板纹理效果众多，机械强度和耐磨性能得到显著提高。
本发明所要解决的技术问题采用以下的技术方案来实现：
一种PVC芯表层热转印户外地板的制备工艺，包括以下步骤：
(1)PVC发泡芯层的制备：将添加发泡剂的PVC物料送入挤塑机加热发泡后挤出；然后将粘流态的发泡PVC挤出料送入模具定形定厚，形成条状板坯；最后将缓速行进的条状板坯在定型装置中进行冷却定型；
(2)热转印：将花纹的图像通过打印机打印到热转印纸上，然后将热转印纸放在PVC发泡芯层的表面上，用转印机将热转印纸上的花纹转印到PVC发泡芯层的表面；
(3)涂胶：向热转印后的PVC芯层表面均匀涂抹改性胶水，然后进行紫外线固化；
(4)覆膜：用覆膜液在固化后的胶水层上进行覆膜，覆膜结束后将其在 硫化机中进行烧制，制得半成品；
(5)包装入库：将半成品养生12小时，检测合格后包装、入库。
所述步骤(1)中挤塑出料时的PVC物料加热发泡温度为160-190℃；降温定型中对板坯的冷却定型温度为20-40℃。
所述步骤(2)中转印机的工作条件：温度为140-180℃、滚轮速度为4-7m/min、压力为2-3MP。
改性胶水的制备方法为：将聚乙烯醇、非离子表面活性剂加入到去离子水中，加热至回流状态保温搅拌10-30min，在氮气氛围下加入羟甲基纤维素、链引发剂、阻聚剂继续回流搅拌1-3h，反应结束后将所得到的接枝产物过滤、水洗、干燥，得到羟甲基纤维素接枝改性的聚乙烯醇，即改性胶水。
所述聚乙烯醇、非离子表面活性剂、去离子水、羟甲基纤维素、链引发剂、阻聚剂的质量比为85-100：0.5-1：300-500：20-30：0.5-2：2-5。
进一步，所述羟甲基纤维素接枝改性聚乙烯醇的接枝率为13-17％。
优选的，所述聚乙烯醇的分子量为110000-130000，粘度为21-33。
优选的，所述羟甲基纤维素的甲氧基值为20％-23％，羟丙基值5％-8％，分子量为10000-50000。
优选的，所述非离子表面活性剂选自聚山梨醇酯20、山梨醇酐硬脂酸酯20和烷基酚聚氧乙烯醚OP-10中的一种。
优选的，所述链引发剂选自偶氮二异丁腈、过氧化二酰、过硫酸钠中的一种。
优选的，所述阻聚剂选自N,N-二甲基甲酰胺、N,N-二甲基乙酰胺、二甲基亚砜中的一种。
所述覆膜液的制备方法为：将石墨烯、纳米二氧化钛、二氧化硅超声分散在去离子水中，然后加入海藻酸钠和丙三醇，升温至65℃保温搅拌0.5-1.5h，即可。
所述石墨烯、纳米二氧化钛、二氧化硅、海藻酸钠、丙三醇、去离子水的质量比为5-8：3-5：6-10：0.5-2：4-8：200-400。
覆膜液能在地板表面形成合金化层的结构，从而显著提升PVC地板的机械强度和耐磨性能，同时石墨烯的添加可以显著改善PVC地板的耐候性能。
本发明的有益效果是：
(1)本发明采用羟甲基纤维素对聚乙烯醇进行接枝改性，在特定的条下控制接枝率为13-17％，该接枝率下的聚乙烯醇与传统胶水相比亲和力、剥离强度更优，同时改性后的聚乙烯醇对热转印后的图像、纹理有较强的保护作用，还能改善PVC地板的机械强度和耐磨性能；
(2)本发明PVC地板包括表层材料、胶水、热转印、芯层材料PVC，所需原材料简单易购，生产效率高，打印机可同时打印多块，每块纹理都可以不一样，生产速度可达到5米/min。
具体实施方式：
为了使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解，下面结合具体实施例，进一步阐述本发明。
实施例1
(1)PVC发泡芯层的制备：将添加发泡剂的PVC物料送入挤塑机加热发泡后挤出；然后将粘流态的发泡PVC挤出料送入模具定形定厚，形成条状板坯；最后将缓速行进的条状板坯在定型装置中进行冷却定型；加热发泡温度为170℃，冷却定型温度为25℃；
(2)热转印：将花纹的图像通过打印机打印到热转印纸上，然后将热转印纸放在PVC发泡芯层的表面上，用转印机将热转印纸上的花纹转印到PVC发泡芯层的表面；转印机的工作条件：温度为165℃、滚轮速度为5m/min、压力为2MP；
(3)涂胶：向热转印后的PVC芯层表面均匀涂抹改性胶水，然后进行紫外线固化；
(4)覆膜：用覆膜液在固化后的胶水层上进行覆膜，覆膜结束后将其在硫化机中进行烧制，制得半成品；
(5)包装入库：将半成品养生12小时，检测合格后包装、入库。
改性胶水的制备：将95份聚乙烯醇、0.5份聚山梨醇酯20加入到400份去离子水中，加热至回流状态保温搅拌20min，在氮气氛围下加入22份羟甲基纤维素、0.8份过硫酸钠、2份N,N-二甲基甲酰胺继续回流搅拌1.5h，反应结束后 将所得到的接枝产物过滤、水洗、干燥，得到羟甲基纤维素接枝改性的聚乙烯醇，即改性胶水，接枝率为13-17％。
覆膜液的制备：将6份石墨烯、3份纳米二氧化钛、7份二氧化硅超声分散在200份去离子水中，然后加入0.6份海藻酸钠和5份丙三醇，升温至65℃保温搅拌1h，即可。
实施例2
(1)PVC发泡芯层的制备：将添加发泡剂的PVC物料送入挤塑机加热发泡后挤出；然后将粘流态的发泡PVC挤出料送入模具定形定厚，形成条状板坯；最后将缓速行进的条状板坯在定型装置中进行冷却定型；加热发泡温度为180℃，冷却定型温度为35℃；
(2)热转印：将花纹的图像通过打印机打印到热转印纸上，然后将热转印纸放在PVC发泡芯层的表面上，用转印机将热转印纸上的花纹转印到PVC发泡芯层的表面；转印机的工作条件：温度为170℃、滚轮速度为6m/min、压力为3MP；
(3)涂胶：向热转印后的PVC芯层表面均匀涂抹改性胶水，然后进行紫外线固化；
(4)覆膜：用覆膜液在固化后的胶水层上进行覆膜，覆膜结束后将其在硫化机中进行烧制，制得半成品；
(5)包装入库：将半成品养生12小时，检测合格后包装、入库。
改性胶水的制备：将98份聚乙烯醇、0.6份山梨醇酐硬脂酸酯20加入到420份去离子水中，加热至回流状态保温搅拌25min，在氮气氛围下加入25份羟甲基纤维素、1.0份偶氮二异丁腈、2.5份二甲基亚砜继续回流搅拌2.5h，反应结束后将所得到的接枝产物过滤、水洗、干燥，得到羟甲基纤维素接枝改性的聚乙烯醇，即改性胶水，接枝率为13-17％。
覆膜液的制备：将6份石墨烯、3份纳米二氧化钛、7份二氧化硅超声分散在200份去离子水中，然后加入0.6份海藻酸钠和5份丙三醇，升温至65℃保温搅拌1h，即可。
对照例1
(1)PVC发泡芯层的制备：将添加发泡剂的PVC物料送入挤塑机加热发 泡后挤出；然后将粘流态的发泡PVC挤出料送入模具定形定厚，形成条状板坯；最后将缓速行进的条状板坯在定型装置中进行冷却定型；加热发泡温度为170℃，冷却定型温度为25℃；
(2)热转印：将花纹的图像通过打印机打印到热转印纸上，然后将热转印纸放在PVC发泡芯层的表面上，用转印机将热转印纸上的花纹转印到PVC发泡芯层的表面；转印机的工作条件：温度为165℃、滚轮速度为5m/min、压力为2MP；
(3)涂胶：向热转印后的PVC芯层表面均匀涂抹改性胶水，然后进行紫外线固化；
(4)覆膜：用覆膜液在固化后的胶水层上进行覆膜，覆膜结束后将其在硫化机中进行烧制，制得半成品；
(5)包装入库：将半成品养生12小时，检测合格后包装、入库。
改性胶水的制备：将95份聚乙烯醇、0.5份聚山梨醇酯20加入到400份去离子水中，加热至回流状态保温搅拌20min，在氮气氛围下加入22份羟甲基纤维素、0.8份过硫酸钠，继续回流搅拌1.5h，反应结束后将所得到的接枝产物过滤、水洗、干燥，得到羟甲基纤维素接枝改性的聚乙烯醇，即改性胶水。
覆膜液的制备：将6份石墨烯、3份纳米二氧化钛、7份二氧化硅超声分散在200份去离子水中，然后加入0.6份海藻酸钠和5份丙三醇，升温至65℃保温搅拌1h，即可。
对照例2
(1)PVC发泡芯层的制备：将添加发泡剂的PVC物料送入挤塑机加热发泡后挤出；然后将粘流态的发泡PVC挤出料送入模具定形定厚，形成条状板坯；最后将缓速行进的条状板坯在定型装置中进行冷却定型；加热发泡温度为170℃，冷却定型温度为25℃；
(2)热转印：将花纹的图像通过打印机打印到热转印纸上，然后将热转印纸放在PVC发泡芯层的表面上，用转印机将热转印纸上的花纹转印到PVC发泡芯层的表面；转印机的工作条件：温度为165℃、滚轮速度为5m/min、压力为2MP；
(3)涂胶：向热转印后的PVC芯层表面均匀涂抹改性胶水，然后进行紫 外线固化；
(4)覆膜：用覆膜液在固化后的胶水层上进行覆膜，覆膜结束后将其在硫化机中进行烧制，制得半成品；
(5)包装入库：将半成品养生12小时，检测合格后包装、入库。
胶水：聚乙烯醇。
覆膜液的制备：将6份石墨烯、3份纳米二氧化钛、7份二氧化硅超声分散在200份去离子水中，然后加入0.6份海藻酸钠和5份丙三醇，升温至65℃保温搅拌1h，即可。
利用实施例1-2、对照例1-2进行户外地板的制备，并对其性能进行测定，结果如表1所示。
表1户外地板的性能测试
Figure PCTCN2020070389-appb-000001
以上显示和描述了本发明的基本原理和主要特征和本发明的优点。本行业的技术人员应该了解，本发明不受上述实施例的限制，上述实施例和说明书中描述的只是说明本发明的原理，在不脱离本发明精神和范围的前提下，本发明还会有各种变化和改进，这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。

Claims (6)

  1. 一种PVC芯表层热转印户外地板的制备工艺，其特征在于，包括以下步骤：
    (1)PVC发泡芯层的制备：将添加发泡剂的PVC物料送入挤塑机加热发泡后挤出；然后将粘流态的发泡PVC挤出料送入模具定形定厚，形成条状板坯；最后将缓速行进的条状板坯在定型装置中进行冷却定型；
    (2)热转印：将花纹的图像通过打印机打印到热转印纸上，然后将热转印纸放在PVC发泡芯层的表面上，用转印机将热转印纸上的花纹转印到PVC发泡芯层的表面；
    (3)涂胶：向热转印后的PVC芯层表面均匀涂抹改性胶水，然后进行紫外线固化；
    (4)覆膜：用覆膜液在固化后的胶水层上进行覆膜，覆膜结束后将其在硫化机中进行烧制，制得半成品；
    (5)包装入库：将半成品养生12小时，检测合格后包装、入库。
  2. 根据权利要求1所述的PVC芯表层热转印户外地板的制备工艺，其特征在于：所述步骤(1)中挤塑出料时的PVC物料加热发泡温度为160-190℃；降温定型中对板坯的冷却定型温度为20-40℃。
  3. 根据权利要求1所述的PVC芯表层热转印户外地板的制备工艺，其特征在于：所述步骤(2)中转印机的工作条件：温度为140-180℃、滚轮速度为4-7m/min、压力为2-3MP。
  4. 根据权利要求1所述的PVC芯表层热转印户外地板的制备工艺，其特征在于，改性胶水的制备方法为：将聚乙烯醇、非离子表面活性剂加入到去离子水中，加热至回流状态保温搅拌10-30min，在氮气氛围下加入羟甲基纤维素、链引发剂、阻聚剂继续回流搅拌1-3h，反应结束后将所得到的接枝产物过滤、水洗、干燥，得到羟甲基纤维素接枝改性的聚乙烯醇，即改性胶水。
  5. 根据权利要求4所述的PVC芯表层热转印户外地板的制备工艺，其特征在于：所述聚乙烯醇、非离子表面活性剂、去离子水、羟甲基纤维素、链引发剂、阻聚剂的质量比为85-100：0.5-1：300-500：20-30：0.5-2：2-5。
  6. 根据权利要求4所述的PVC芯表层热转印户外地板的制备工艺，其特 征在于：所述羟甲基纤维素接枝改性聚乙烯醇的接枝率为13-17％。
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