应用说明

高承重性能

在过去的几年里,通过使用各种化学或热改性的方法,我们已经将耐久性有限的木材成功的使用在了户外建筑上。改性木材越来越多地出现在市场上,主要使用的品牌像Accoya®, Lignia®, Keboni®和其他类型的品牌。现在其他的一些抗性树种已经被广泛的应用,如柳桉、刺槐和柚木。

所有这些自然抵抗或改性型的木材有着一个共同的特点:高的耐候性能。这是因为水分的吸收和释放非常缓慢。对于这些天然复合木材或者改性型木材来说,这种性能是影响其粘合强度的主要因素。例如,通常使用PVAc水胶是不经济的,因为这些胶有着很长加压时间。在开放式涂胶系统中,粘合剂会直接暴露在阳光下,尤其是暗表面,这就需要增加胶层的耐热性能,而热塑性的PVAc粘合剂不能达到要求。

为了解决这一特殊的粘合要求,可以添加胶王公司的固化剂:
- 双组份EPI白乳胶
- 单组份PUR粘合剂

 

这两种粘合剂都有着高防潮性能,根据欧盟204/205标准,粘结可达到D4级标准。根据欧盟14257 (Watt 91)标准,在80℃的耐热测试中,EPI和单组份PUR粘合剂的剥离强度都大于7 N/mm²。EPI(聚异氰酸酯)粘合剂不同于反应型PVAc水性粘合剂,其固含量高,快速固化。在粘合剂中添加化学反应固化剂能够降低其热塑性,同时能够提高粘合剂的耐热性能。

EPI粘合剂通常是以双组份形式进行使用,需要添加15 %的固化剂,使用前需要进行均匀混合,并且注意其活化期。适用于水胶操作工艺。当设备停机时间超过粘合剂的活化期时,必须要清空设备并进行清洗。液态PUR聚氨酯属于单组份湿固化反应型粘合剂。其固含量到达100%,因此低渗透性木材不会影响粘合剂的使用工艺。胶层必须充分的暴露在潮湿环境中,这样聚氨酯粘合剂的交联反应才能完全反应。这就意味着当木质基材的含水率小于8%时,胶层必须进行喷雾加湿。在PUR使用前,PUR粘合剂需要在特殊的设备中进行操作,防止其接触水分和空气。

胶王公司的粘合剂适用于木质基材层压组装、指接或拼板。
由于木质基材和复合材料的不同,其生产工艺不能适用于所有粘合剂。处理的木材或改性的木材在使用粘合剂粘合前需要进行测试。

1.

试件:Accoya®尺寸...

2.

剥离测试...

3.

剥离... 100 %木破

产品信息

Choose a product group

Edgebanding on Tricoya®

Base Viscosity [mPas] /
Temperature [°C]
Open Assembly Time [s] /
Temperature [°C] /
µm Film
Open Assembly Time [min] /
Temperature [°C]
Application Download
technical
data sheet (PDF)
Jowat-Toptherm® 237.10/11 PO Hot Melt Adhesive 85500 ± 14000 / 200 7± 2 / 190 / 200 For the bonding e.g. edgebands made of CPL, polyester, resinated paper or veneer. de en fr
Jowatherm-Reaktant® 607.50/51 PUR Hot Melt Adhesive 75000 ± 25000 / 140 8 ± 2 / 140 For bonding thermoplastic edgebands with suitable primer application on the reverse side. Can be applied with high-speed wrapping machines. de en fr

Flat lamination on Tricoya®

Base Viscosity [mPas] /
Temperature [°C]
Open Assembly Time [s] /
Temperature [°C] /
µm Film
Open Assembly Time [min] /
Temperature [°C]
Application Download
technical
data sheet (PDF)
Jowat-Toptherm® 236.50 PO Hot Melt Adhesive 8000 ± 2000 / 200 15 ± 2 / 190 / 120 For wrapping profiles made of soild wood, particleboard and MDF with resinated paper foils and thermoplastic foils. de en fr
Jowatherm-Reaktant® 609.45 PUR Hot Melt Adhesive 31000 ± 11000 / 120 60 ± 15 1 ± 0,2 / 120 For flat lamination and the manufacture of sandwich elements and for wrapping wood and plastic profiles with non-transparent foils and with decor papers. de en fr

PUR-Prepolymer

Base Viscosity [mPas] /
Temperature [°C]
Open Assembly Time [s] /
Temperature [°C] /
µm Film
Open Assembly Time [min] /
Temperature [°C]
Application Download
technical
data sheet (PDF)
Jowat-PowerPUR® 687.40 1-Component PUR Prepolymer 6000 / 20 30 - 40 / 20 Adhesive for bonding of hard wood species, composites of HPL/CPL, bonding to galvanized iron or metals, bonding expanded polystyrene (sanded) to wood, stone and many other substrates. de en fr

The products listed only represent a limited selection of the available product portfolio. Product availability might differ by region. The technical data, characteristics and field of application provided in the table outline the differences between the individual adhesives of the product portfolio. Our Application Technology Department and our Sales Representatives are on hand to provide advice and support you finding the best adhesive for your particular application.

Note: The information on this page is based on test results from our laboratories as well as on experience gained in the field, and does in no way constitute any guarantee of properties. Due to the wide range of different applications, substrates, and processing methods beyond our control, no liability may be derived from these indications nor from the information provided by our free technical advisory service. Customer trials under everyday conditions, testing for suitability at normal processing conditions, and appropriate fit-for-purpose testing are absolutely necessary. For the specifications as well as further information, please refer to the latest technical data sheets.

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